5D BIM (Cost/Quantities) in Revit!

[Music] you know that you're watching the Aussie boom guru and today I'm covering a topic which is 5 d BIM or estimating using Revit so cost and quantity specifically so thanks I'm tomorrow for his request on this one a couple of months ago it took me a while to get to this topic so on thanks for your patience and hopefully you're still watching feel free to drop me a comment just to let me know what you thought I also want to thank actually as well for sort of motivating me to get onto this topic I've been talking to him about how he could potentially leverage Revit in his business for cost so some really great and interesting ideas I've been able to share with him and hopefully it helps his business and how he works in this video I'm going to specifically cover four key areas or sections with the presentation so feel free to jump ahead if there's particular ones that relate more to what you're looking for I'm going to start off just by explaining 5d BIM what it covers what are these the implications and why it's important from there I'm just going to mention some key considerations in how you can set up a 5d BIM analysis workflow for your office using a variety of tools for specifically Revit and I'm going to show you four methods in Revit you can use to do takeoff and cost analysis straight out of your model and also just conclude with some general tips just to finish up the presentation but 5d or estimation is essentially one of the dimensions of BIM so you've got 3d modeling or existing conditions 4d foreshadowing time and construction 5d for estimation and cost analysis 6-day for sustainability and energy and seven days and facilities management and operations that were just focusing on 5d today and specifically we're going to be focusing on three aspects which are cost planning and quantity takeoff so how many for quantity takeoff and how much for cost two of the most important questions when you're leading a project into construction and you're trying to procure it so in simpler terms we're really just talking about money methods of establishing a cost bench line using our model or a benchmark so for the professionals I want to make sure that you're aware that I'm not a quantity surveyor I'm really just an architectural BIM manager so I'm coming from this perspective so there is actually programs out there that quantity surveyors can and should probably use if gonna be doing their job I've heard cost X is a very good program that seems to be one of the leaders in Australia for selection but there's other ones in different areas of the world such as one I know called presto which is quite popular in Spain so I feel free to check this out if you're interested anyway some key considerations when you're establishing a cost or estimation workflow from your Revit model is that BIM is actually really good at 5d when it's done right it's also really bad when it's done really badly as well so I guess you don't have to be a bean counter you don't have to do everything manually so try and take advantage of all the tools you have at your disposal try not to fall back on the easy way that you're familiar with that maybe is a lot slower than the potential ways you could learn or try take a risk and I guess just to drop a mean if your BIM model isn't good you're gonna have a bad time you've got to put the effort into your model before you delve into cost because accuracy is so important so there's just some things that model it properly that's usually one of my main bottom lines when it comes to cost in Revit so make sure you use 3d Revit families and actually your model accurately you manage your data carefully and you use the right categories of elements for scheduling so don't do things like this don't draw things in 2d or use model lines to represent things that have a cost associated with them or a quantity associated with them for example this table that's been added to this model no one I work with has done this I just did it as an example but I have seen this done before where people have come from an AutoCAD background or something similar and they don't understand the importance of quantities and type control so it really be careful about working like this because you're really taking away the smarts of the BIM model as well as this keep in mind that things should be modeled correctly or as they would be built in the real world so you can get after it quantities let's say in this case we're trying to take a quantity of the paint on these walls it wouldn't be correct because they're going through the roof at the moment and whilst in floor plan or a drawing this might look okay in the model we know it to be wrong so if we went and checked a quantity take off schedule for these materials we could over order on the paint required for the project usually there's a measures to stop these things happening in BIM but just be really for when your model to think about how you're modeling in all dimensions keep in mind that data is critical in BIM when it comes to cost because thinks things need to be told what they are and what's special about them what dimensions they are because how else can we cost them when we cost in BIM we rarely actually use the 3d geometry of the element to measure we're typically taking data instead and extrapolating that into schedules so here's a door for example that comes out of the basic sample project and I would say that this door is horribly inefficient it has almost no information associated to it so we really couldn't get a lot out of it I mean the most critical thing that's missing is it doesn't even have a type name so I don't even know really what it is aside from the data I have here which is very limited as well as this here's a door I would say it's good it has a lot of information it has a type it has fire ratings it has a lot of dimensions associated with it that I can get they're all shared parameters as well so really important that you can schedule these and there's codes descriptions so I can actually limit a show tool to show me particular things let's say I only want to see doors in a multi category schedule I can filter by does the description contain door for example and I guess think about this imagine the pair of shoes that you wear are going to be turned into a Revit family so as soon as something's in Revit Revit only understands what you tell it so let's say that this shoe is categorized as telephone devices you may as well just start using your shoes as a telephone if the category is wrong Revit has no way of fixing or understanding that this is a mistake so it's really important to consider things like casework versus furniture especially equipment versus generic models and which one you use because you need to schedule these things together sometimes keep in mind that all plumbing fixtures should be kept under the category of plumbing fixtures so really basic stuff usually that it's really important to keep it in mind and above all have a strategy a software doesn't dictate things to us we dictate to it Revit is really just a program that's a tool it's a framework to execute BIM so you need to tell it how the cost system works you can't just expect it to do it all for you if the program makes a mistake it didn't make a mistake you made a mistake so I'm actually you really think about your system before you dive into it so four methods I'm going to cover in rabbits and never run to the good stuff for the rabbit users I'm going to cover four so I'll start off with the first one which is what I call unit cost by account so imagine this kitchen and I'll show you an example in a model in a second as well so it's not just talking but imagine you just want to figure out how many chairs you have times their cost it's very simple you're really just setting off a very basic formula to find the total cost so let's jump into Revit just into the basic sample project and let's just generate the schedule for all the furniture in the model so I'll just create a schedule so this is the best way to extrapolate quantities out of the model keep in mind there's a lot of considerations when you're setting up a schedule like is everything phased correctly have I double double modeled elements in the wrong place is everything in there in 3d under the right category I'm going to use a furniture schedule here you could use a multi category schedule as well if you want to pick up multiple elements in a single schedule so what we'll schedule about this is we're going to use family and time to identify the different elements and what they represent as a cost element so we'll get the family and tire we're going to get the count which is a special field available in most Reg rules which will tell you how many of something there are we're going to get the cost as well so we'll just stick with that for now I'm just sorting and grouping we'll just sort by family and tithe so let's see what we get so what we're going to get is what's called an itemized schedule every row represents one element so you can see that that is the case because count is always 1 we don't want to do this we want to di Tamayo schedule so that the rows represent the sorted element so we're sorting by family and type all you have to do is take off itemize every instance and depending on how you've sorted your schedule it will clump them together in rows so now you can see this row represents all 6 bar chairs in my project and you can see that the count because if the special field has accumulated how many of those occur in each row at the moment none of these elements have a cost so there's two ways to add cost to a family it's actually a special parameter called cost so let's just go find this bar chair in a my browser and we'll add a cost to it so at the moment in its type properties cost is going to be empty so at the moment we need to associate a cost to it let's say this bar chair or any costs 120 dollars each so what you're doing here is put the unit cost and now you can see we have six of these four hundred and twenty dollars note that this isn't a total so we actually need to do some more work to make this into a total I'm just going to really quickly just pump some numbers into here let's say dining chairs 300 the TV has shown up so that's interesting this is a good example of how you need to categorize things correctly so we've got a TV here on the furniture I'd argue that should probably be specialty equipment or electrical equipment because it's an appliance it's not really a furniture object so just a good example of how you should be mindful and I think this is coming out of the Autodesk example project so it goes to show that you can't always assume audiodesk is gonna get everything a hundred percent right because ultimately they're not architects they were software developers they were just taking their best guess as to how people were going to use their program so nothing wrong with what they've done and I'm just not how we typically work let's just take the sofas and I'm just giving everything a cost in the schedule so this is the unit cost not the total cost for more than one of these if we want to make this reflect the total cost of each row we need to get a formatting select the cost field and where it says no calculation we go calculate totals so far okay that now this is the total cost of the row so that's much more important you could also do a calculated field as well so what we could do is just get rid of get rid of this calculate totals and go back to a standard row and we can also go and add a calculated field and the only time you do this is if you want to see the unit cost and also the total cost and we'll just call this cost two so this is a calculated field it's not actually in the families it's only in the schedule we'll make this currency based and we'll just say that this is the same as cost as essentially the same parameter twice for this one we will calculate totals we'll call cost unit cost you could do it either way around you could actually make the cost you in the costs and vice versa essentially we're just overriding what the header is called Sophie okay that now you can see we still have the unit cost but then we also have the total cost as well if you want to add the double sign that's easy to it so on the field format unless you want to change your project settings to always show dollars you can just deviate from the project settings and add dolls there so quite easy there you go and if you want to do digit groupings so like every three numbers you get a comma that's easy as well so let's just say for the total cost field format and we'll just use digit grouping and there you go now you see we get that common like you would have a usual write up shade so that's pretty much it if you wanna see your grand total your overall spend on furniture just turn on grand totals and turn on totals you can do counts on tables as well if you want to see how many pieces of furniture you have let's just do that we'll do both I think we also need to say the count generates a total as well actually yes there we go and there you go you can see we have 30 pieces of furniture and then we also have $14,000 220 expenditure total and because we're in BIM the beautiful thing is that if we add things to the project schedule will update as well so let's say we add another chair and another table outside to our project so what's the numbers it's 14 to 20 at the moment voila our cost adjusted to suit the quantities in the project so this could be maintained in your project as a cost schedule so really important and really useful to understand as well and you could obviously rename the schedule to something else and if you're happy with this schedule you can actually export it to excel so under export if you scroll down to the bottom reports schedule you'll output it as an XML or a txt file add a limited text file that's what they call it so we just go save and you can check your Dometic here there's a few settings as you just say okay and then if you just navigate to that file my desktop in this case I think we just drag and drop it onto Excel so open Excel drag-and-drop and there you go that's our schedule it comes in unformatted obviously but it's all there for me for use so really easy nikki is dynamo to hook that up as well so this is one method there's three more so it's a little bit of a long video but hopefully this is all really helpful that was my demonstration so method two is what I call rate cost by data so this is the same thing you're still quantifying but you're doing it on a different basis you're taking something like a dimension of an element and then using that to drive a cost so this could be like the length of a structural beam for example obviously the longer a beam is the more expensive it is because you're paying for more steel so in this case to say that you just cost a beam on a unit cost is wrong because the length will be different in different scenarios and you need to associate some sort of cost of right to it this is where it's really important to have a strategy because if you don't know how much you're paying their lineal meter of a certain size of steel member and it's very hard to make your BIM model do that because you have no formula or no right to apply to it it's a really critical so let's just do that as well let's just use a steel beam as a reference I'm not just going to make a new project in this case just a architectural template this is the default order this template as well so no smoke and mirrors and I'll just keep this open in the background so I'm in my new project you all right so let's just model a steel beam actually let's model two of them I'll do one here one here and yeah that'll do I'll just jump into 3d because they're out something like a range of the moment that under my view range let's just edit the family because we're going to need to add a ratio or a formula to it to calculate its cost because currently whilst this beam does have a cost parameter you'll notice that it can't be changed it's always a type parameter this is a problem because the beams adjust themselves on an instance basis so we can't actually get the formula to follow what you need in this case is the second parameter to deal with cost on an instant's basis and then we add this to the default cost parameter in a schedule or we ignore it depending on whether the elements in that schedule use both cost fields or not this is the only way I know to get around this unfortunately so what we're going to do first is get a reporting parameter to report the length of the beam because this length is a special length it goes all the way to the end of the beam even if the beam stop shop short if your beam has extensions on it this is actually the reference plane that will derive the length of the beam so I'm going to add a reporting parameter on an instance basis and just call this report links and this should be added in the family now what we need to do now is make a shared parameter the reason we use a shared parameters so we can schedule it in the project so I'm gonna add one from my my company shared parameter file I'm just not the data so essentially this is just a currency parameter that I've added as you can see I have a pretty extensive shape parameter file I've set up where I work you can see it's just a currency parameter under the column of common discipline that's all it needs to be so let's add that just under identity data because the other cost is under there as well but let's make this an instance parameter and we want to derive this by a certain rate so let's just say that I flat rate is that every millimeter of steel beam that we create cost us a dollar let's say I don't know what the going rate is for steel but let's just say that for now and obviously it might be different you might want to add other factors into the formula like the size of your steel profile or the volume so the area of the face of the steel profile lots of factors to consider for now I'm just going to ignore that so you could use a section area for example what I'll do is I'll take this reporting length copy its parameter name and I'll set up a formula so I'll say that this is equal to report length times we'll just say what was it again 1 so $1 if I click and try to finish this formula it gives me an inconsistent unit warning because we're timesing length times currency the problem with a length field is it maintains its units so what you need to do is manage its unit out so I'm going to divide it by a millimeter and there you go now you can see it rationalizes because we're managing the unit out it sort of works a bit like cancelling out like a negative or something like that if you multiply two negatives you get a positive it's similar if you divide a unit by another unit you end up with something unitless the same can apply to square meters and volume as well the only difference is you have to divide by a meter squared meters cubed etc there you go so now what will happen is this changes length it should adjust this cost as well they're pretty exciting I'll just I'll just load this into project one that I've created will override its parameter values and we should have an instance parameter down here there you go you can see our cost alternate currently eighteen thousand four hundred dollars that's a expensive min let's change its length and now you can see it's fourteen thousand eight hundred so we can see that the formula is working because we're doing $1 per millimeter so we can see that connection and that relationship and if I change my extension you can see now that my reporting length and is still seventeen thousand and 2000 is my cost but notice that my length isn't so that's where that extension versus length behavior comes into play so a little lesson about beams as well just snuck in there on the side as well so that's how you can do a unit cost from there it's just the same process you just create a schedule in this case I'll create a structural framing schedule for my beams we'll just add their family in tight and you don't have to use family on top you can use description family type all sorts of fields given mine family and family and type and type a tricky because you can't use them in filters so some of this description is better the key is having the right descriptions in there that are unique as well because if they're not unique it'll be hard to make them row items because they'll try to group themselves together if they have the same descriptions what we'll do here is sort my family entire and I'll just also add in my cost ultimate and if you want to manage your cost and your alternate cost into one field I'll show you a trick for that as well so here's your tube costs um you could add count if you wanted to what we're gonna do now is add another calculated field and just call this Lamine cost and it's going to be currency and it's just constant cost alternate plus cost this way if one of them is zero and the other one is zero on another case they'll always combine to give you the whole costs of the the element regardless of which parameter they use let's just-okay that so notice that my combined cost is empty that's because you need to set the cost parameter to zero if you've got a family that's always only using its ultimate costs it's it's really easy all you have to do is go in the family and in its formula if it cost just lock it down to zero and that will always make that field zero no matter what so we'll just go back to project one back to a structural framing schedule and there we go it's interesting I must've done something it's not showing me zero there but it's still showing me the combined costs so I'm wondering if there might be a graphical bug that caused that to be hidden for a second yeah there we go it was a graphical bug and then you can pretty much just hide your two across fields under formatting with higher costs and that's why it cost ultimate and all we see is our cost so that that's a really easy way that you can do it and let's say you have maybe like three different types of beams so you have a UV maybe you have a small UB let's say we just have one that's 165 by 20 so I'll just go find that different parameter oops yeah so if we go back to our structural framing schedule you see we have two beams at 165 by 20 by 40 and 1 by 20 what we can do in this case if you want to make them sort of separate areas of your coschedule and one I'm here I'll just go and quickly calculate totals for my cost you can also you can sort with a header so what this does is it separates them into areas and you can also add a black line and that sort of subtotals all your elements because what you can do with that header is that a footer and just call it totals only and you can get subtitles as well as well as your combined total if you get a grand total and you turn on totals and that will give you the major table down the bottom and subtotals per members so you can see how much money you're spending on each type of profile for example so really easy ways to break up your schedule I'll probably do another tutorial on schedules at a later date but I'm going to try and cover some of the the most important cost schedule and techniques in this one but that's a technique too so technique 3 is a little bit easier because some of the work is done for us so this one is what I call a rape cost driven by inherent data so these are parameters that come by default under certain categories so if this could be like floor area for example so floor area is something that we don't have to calculate it's just driven by that the size of the floor that you draw and what you have to do is associate a cost rate to it and use a calculated field in the schedule so I'll really quickly show you how that works and I'll show you something that's a bit trickier that comes with this which is walls walls are a lot harder than floors so I'll just really quickly model up a couple of floors I'll just do two of these and one of the 300 millimeter floor and in their type properties I'll just give them a costume rate so note that this isn't unit cost this is a per square meter cost so I'll say this is $15 a square meter and the 300 millimeter type is $30 a square meter then if I create a shed you'll for floors I can add family and type or any other parameter essentially and the area and the cost then I'll sort by family and type turn off itemize okay so you can see that we have two of these and one of these so what we need to do is go into area and turn on calculate totals as well because two of those floors were the same area so it reports this area as 62 square meters but it's really telling you those two floors in that row both have the same area of 62 would combined they have 123 square meters so be really careful with area and cost when you don't calculate the total in the row because that can be quite sneaky if you're not careful especially when you have copies of elements that just happen to have the same area or the same costs likewise we could also just really quickly add a calculated field for the total cost oops I'll just cancel that I kicked the area in my schedule okay so out of calculated field and I just call this total cost and this again is a formula so this will be the area times the cost so again we're gonna have some challenges with units here I try and okay that I have inconsistent units so what I can do is just divide by one millimeter divided offset by one meter and 1 meter not one millimeter sorry you're really careful which units each thing is working in areas in this case for me are working in meters and then you look you see a letter through after that and then from there we can just calculate totals field format and we can just say three decimal places with dollars and digit grouping okay now you can see we have total cost and because this florid that's half as much but it's twice as expensive we end up with the same cost that was just a little way to test if that was true and correct and likewise you can go to the total cost and you can calculate totals and you can turn on grand totals as well too easy right so pretty simple walls now walls are a lot harder because walls the way they're measured is quite challenging I'll try and explain it but you've probably to experiment just to really understand how this works so I'm just gonna model a wall I'll just do a double brick wall so note that this wall is comprised of a few layers it's got a masonry brick on the outside and infiltration later or an agar and then a masonry or a block wall on the inside so different materials in each layer I'm just going to model one wall to begin with and I'm gonna model it for let's do one meter and I'm gonna make it one meter high so we know that it's face area is a meter squared okay so let's just see how this looks from a cost building perspective first so we're going to focus on just a couple of parameters that relate to the wall so we're gonna pick out family and type of course but then we're gonna focus on two ways of measuring the wall one is area and one is length and the wall has a cost associated with it but it's important to note this is a system cost this is everything in the wall combined how expensive is it now this is important too so you've got a cost or a rate associated with the wall but what's the measurement ratio based on what is this cost applied on rabbit won't tell you this you could measure it based on linear meter or face area obviously face area probably makes more sense because it's a result of the height and the length more or less so let's say in this case this wall system costs us $50 a square meter so if I go back in my schedule we can see that now we have a costs a length in an area so the thing now we need to figure out is how do we want to measure this but before we do this I'm going to show you what happens when you introduce another wall that's joined to it I'll do another wall I made along and I'm just gonna add a comment to them so you can see which wall is which so what we have comment 1 is 1 and comment 2 is 2 so we know both of these walls at their center or I made along but that's the important part so you'll see why I like comments let's see what's what's being told to us about these now I'm just gonna go to formatting check my area and I'm gonna make my rounding just a little bit more so I can see what I'm dealing with 3 decimal place at different areas so that's quite surprising right you wouldn't expect that one of them is 1.13 five square meters and one is point eight six five square meters so together they combined to two square meters but one of the walls is tasting for taking precedent over the other one so quite interesting right and the reason why this is happening is because of joint precedence in walls so if you go to your wall joint all one wall always has priority over the other in the joint unless you do a miter joint this is what we call the butt joint at the moment so you can't actually see it but one of these is basically telling the other one to finish if I low on my view around you might be able to see what's going on I'll just take it down to 500 up off the floor interesting I still can't that's it it's quite interesting hmm still can't see it that's very interesting not the focus but essentially one wall is taken for already over the other so if I just say to cycle the junction you'll see that now the relationship is inverted one of the other walls has taken priority and the area is different so you need to be really careful with this when you're taking area faces of walls because one of the walls essentially takes out the area of the other one and if I wanted to truly measure something like the outside face of the brick of these walls this might not be the best way to do it it's really what we have here is one point 135 off brick and more or less the same depending on how you joined the brick obviously you'd be coining it on the corner so maybe it's an okay way to measure it but you need to be really aware that what you see isn't always what you get with certain categories in Revit when they join to each other that can be quite confusing for Revit to communicate to you so it's not always 100% accurate need to be really careful with that so hopefully that sort of makes sense there's not really any easy way for me to give you a strategy to work with things like this this is where your company needs to test innovate measure and see if the way you can use the system works for you so maybe you have tolerance that you apply to certain categories of elements or you accept a certain tolerance in the inactive see if what you measure you say we're within 10% of our estimate on that wall surface phase for example up to you and obviously the area of this wall doesn't reflect the length in both aspects so internally I only have 865 and 865 technically I've exposed paint for example so using the area in this case would be a bad choice because it's doesn't it's not really reflecting how much internal area you really have it's only reflecting really the length based on the walls placement which in this case is point to Junction so just be really mindful of that as well as that you have to be really careful that if you don't model well with walls you can get some very and accurate takeoffs so let's just disallow join on both of these walls so that they don't have to join together and I'll just model these all the way up to each other and get them to clash so you'll see that the schedules are quite unforgiving now both of the walls accounting all the area even where they overlap because the walls aren't joined so they're not being told to stop short so just be really careful with bad modeling because that can happen all right so once are the last technique this one's pretty hard I'm not going to go too far into it I'm just going to show you that it's available and that it does work if you know what you're doing but essentially this is a raid cost biomaterial or a material take-off it's very complicated and it relies on you setting up your materials really well and knowing whether applied and making sure that your elements are modelled correctly so that all the exposed face of material that's available is true and correct so it's very risky if you get this one wrong or if you use it with that understanding how it really works so I'll break it down really quickly but let's say we want to measure all the paint in this room so the paint doesn't just occur in walls and occurs and ceilings it might occur in bulkheads or feature elements there's so many things to consider when you consider biomaterial especially for trade crossing materials like plaster board so just keep this in mind it's very hard I'm just going to show you how the tool works but not how you can do an entire cost takeoff to do this because it's quite hard but essentially there's another tool under view and the schedules called was a material take off there we go so this is really important it's it's basically going to create a list of sub components of materials from any Revit family category you can do a multi category schedule but it won't pick up every single category so just play with that one and you'll quickly figure out what's markets in the schedule and what doesn't I'll do one now if we need to just so you can see what's actually in there so we'll just add cost and family and type and I think yeah so we don't have anything in there at the moment because walls for ceilings all these system elements they don't get into Modi category schedules things like doors furniture especially equipment so loadable content that's what shows up in those so just be mindful you might be able to lump everything together in this way sorry I need to make a material take off so let's just do a take off of our walls so we're going to measure all the materials that go into our walls so I'm going to add the cost and you'll have a whole set of additional things you can add based on material so what I'll do is I'll add the material area or as paint just to show you how that one works admah Tyrael cost and material name so you'll sort of see the confusion that comes in with this method now I'll just move the cost down to the back all right so we're not going to get elements in this type of schedule I'll just put the name at the front what we actually get is every occurrence of that material in a wall so you'll see what we actually get is all the layers of each wall so we have the air and filtration barrier of both walls the masonry in both walls and the brick in both walls so it's measuring it based on layers very very important to understand and each category is slightly different how it works I'm just going to show you walls because there are more complex category so let's just really I join in this case so at the moment I've also have a cost associated to them at $50 a square meter no material take off notice that that's appeared for every single layer in the wall so that's inaccurate because that $50 is a system cost not a layer cost we're not going to apply that right to the air infiltration barrier than masonry and the brick because all of these are being scheduled as the area of the wall so we'd be blowing out our cost three times over if we did this based on the cost field what we care about is the material cost field very different so what we need to do in this case is apply cost to the materials within the walls so what you do jump into your materials and you'll have a property you can manipulate in here instead this is one material management becomes so important at this point because if you don't have cost in your materials or you didn't have descriptions or names that make sense your cost doesn't get a max sense either so at the moment I'm just gonna say that my brick is $50 a square I shall say $40 a square meter my air infiltration barrier I don't actually want to show you I'm not really costing this let's say we're just doing a masonry takeoff of our walls so what I'll do here is give it a comment and just say do not cost and then likewise we'll make our masonry and let's say this is a bit more expensive visit the block so under costs we'll say this is $60 a square metre if we revisit our take-off you'll see now we should have picked up those cost rates interesting I mustn't have committed the masonry change I'll just double check that it looks like a masonry cost hasn't sure enough yeah they didn't get committed I'll just make sure I do that oh there we go okay so now you can see we have cost for a masonry and up brick let's say we are costing our infiltration barriers somewhere else so maybe it does have a cost but if we don't want to include it in this specific schedule so what you need to do is actually filter it out of your schedule so we're gonna add comments and we'll make it a hidden field and we'll filter based on the comments and we'll say that what we're looking at has to make that the comment doesn't equal [Music] okay that I'll just double-check my air infiltration barrier material and make sure it has that value still in there no I mustn't have committed that either oops do you not cost and there you go now that air infiltration barriers managed out so we don't see it anymore we can do here as well is we can do subtitles so we can do sort by material name and don't itemize so now we just see all our masonry and all that brick what we could do then is remember we've got two pieces of masonry or brick each so we actually need to total these so at the moment it's telling me it's one square meter that's not true we actually have three square meters of both in lineal lineal meter what we need to do is go to area and do a calculate totals we also need to do for a cost we don't have to because this is sort of like a right cost we're going to just get rid of our cost field just to avoid confusion because it's the wrong one and we had a calculated field and we'll just call this total cost because we have a right cost and we have something to measure the right buyer which is the area so we're going to measure this as currency and we'll say this is the area times the cost and again we're going to need to divide this by one meter and one meter just to manage the units here and we will interesting we need to calculate the cost here there we go so now we have my material cost and we have our total cost so because we have two square meters of each you can see we have double that for our total cost so that's how you can do a take-off but you need to be really careful with some things one thing you got to be so careful or careful of is the paint tool so imagine you had a brick wall and then you painted the outside of it with brick because the pattern wasn't working and then someone came and fixed the pattern no problems you think that this wouldn't cause any issues because it's just brick on a layer of brick you'd be surprised what happens in this case let's just paint all the sides with masonry okay now we'll use we use something silly we use Gibson wall board let's say I paint the interior wall with gypsum I'll see that's wrong because it's not a true BIM workflow so check out what happens we still have the masonry because it's inside the wall it's a layer and it thinks that the gypsum wallboard is like another layer which it isn't so if you painted your wall in brick you'd end up with double the brick in your wall so you've got to be so careful with things like this because they're just wrong they won't work so be really mindful that the paint tool is very dangerous the only good thing about it is that it says it's paint so what you can do is add a paint catch in here you can say as paint has to equal to no and then anything that's paint is out so just be really mindful of that so that's sort of how the quantity takeoff material tool works but you really need to experiment with it to understand it in its entirety it can do some very powerful things it can do like fabric area based on a family so there's a lot of advanced things that can do but just be really careful because you can see there there's a lot of pitfalls and traps if you're not modeling properly or you're not setting up your BIM content properly so that's pretty much it that's four techniques you can use in order to cost to cost your model or get quantities so that's pretty much it and then bringing it all together as you can see you can export these things over Excel and you can put these all together in one big file and then add your cost to a total report or you can do something like dynamo or special plugins that can direct the starter together and put it all together for you just keep that in mind some things to remember just like some final parting advice when in doubt just check measure mission manually check what your schedules are telling you versus what you're seeing because at the end of the day BIM can make mistakes if you don't set it up properly and when you're not in doubt it's usually good to just check anyway just to make sure that it's doing what it's meant to be doing and remember you're not the quantity surveyor this doesn't take away the importance of their role they are still liable for cost advice you are typically not as an architect or an engineer it's not your specialty it's not your expertise this is just your way of helping them and speeding up your design process by educating yourself on cost in the process so definitely don't don't tell the cost of air that you are the captain now it doesn't work that way but hopefully the cost surveyors or the quantity surveyors they should appreciate this if you do it for them because it's it's very rare that architects or engineers go out of their way to do this for quantity surveyors and I really feel for them because I can really see where some of them don't use BIM because they're not really feeling very welcome when no one else helps them even start with this process so try to help them get into the picture and maybe they'll do it next time on the project or they'll just find it easier to work with you maybe they'll come back and work with you again so be their friend they're good people and remember no half measures literally half measures are just where you do something the lazy way and as a result you get a bad result or your BIM models just not gonna work so no half measures so hopefully that helps you better understand 5d BIM and quantity surveying that you can do out of Revit and just in general if you've got any feedback or comments feel free to leave it down below I make videos two to three times a week and I'll continue to do so for a very long time hopefully if you're not ordering for long that's describing feel free to do so and hopefully I'll see you in the next video thanks take care you

Channel: Aussie BIM Guru

Views: 17,038

Rating: 4.9787235 out of 5

Keywords: aussie, bim, guru, cad, revit, dynamo, computational, tutorial, demonstration, how to, educational, cost, 5d, estimation, quantity takeoff, 5d bim, 5d revit, quantity survey, cost analysis, presto, costx, material takeoff, schedule, quantities

Id: sMhRa9HGFko

Length: 42min 6sec (2526 seconds)

Published: Sun Nov 17 2019