Application and installation of an external wall insulation system

hi it's ewi stall here I'm standing in front of a mock-up wall with a window included just to show you about the external wall ventilation system basically the thing to to do on all the properties is to insulate externally which slows down the heat transfer and basically lowers bills and increases your comfort so we have here some products that you are used in order to do this or ewi pro products and we're just going to show you the various stages and to complete the job external wall insulation can be applied onto a brick block or over existing render here we have a demo wall that has been built using block work with a window installed in the middle as well just to replicate what you would see on a normal job now the first step is preparation and protection so here you see the Installer using the window reveal beat often called an APU bead onto the window frame this later on in the install means that you don't get any of the base coat or top coat onto the window frame which can damage obviously the window itself now what he's done is he's cut the bead at 45 degrees which means that they slot together nicely and leave you with the best result the window revealed beads are used on both the left and the right side and also at the top they're not required at the bottom as you should have a windowsill or over silk installed as well now what he's doing here is just making sure that all of the window reveal beads are in line and you don't get any issues later on once you've fully installed it the next step is to make sure that everything is fully protected what you don't want is to worry about the windows or doors throughout the job when you could easily just protect them with a window protective film at the start and remove once complete now these obviously are a very cheap and easy way of keeping the job clean but also be very precise and make sure that you've got those nice clean lines everywhere and just to give it the most professional finish [Music] now the next step is to prime the walls using a universal primer now this is an optional method an absolute solution but would give you the best adhesion to the substrate what the universal primer is is a gritty primer which dries like a kind of sandpaper finish so it improves adhesion from the adhesives and the base coats onto the substrate the universal primer can be applied both using a paintbrush or a large brush like this one a roller or indeed can even be spray applied depending on the size of the job and on which methods of application you go for the universal primer is the nice red color so you know exactly where your primed somewhere you haven't once the universal primer has dried you then install the XPS insulation down below DPC level now this is extruded polystyrene and is very tough and durable for those lower areas which come across a lot more trauma than the other areas this XPS insulation is to close the cell but what you do is you stick it onto the wall using the ewi 2 to 5 premium base coat adhesive as you see here he is just installing it with a notch trowel just so you get a nice even thickness on the back of the board this is then stuck onto the wall and just to make sure that it's all nicely straight use a spirit level to make sure that it's all applied nicely perfectly straight once all of these are combined as you see the XPS boards have a kind of they're not bored once they are installed use the expanding foam tape just a small strip of this along the top of the board and once this is installed you then put the aluminium starter track or in fact the uPVC starter track on top of the XPS this expanding foam will create a seal and will stop any water penetrating through and in behind the system on this video here you can see that it is the aluminium start to track being used although there is an option for uPVC as well the aluminium starts track is cut to size cut to length and obviously at 45-degree angles around corners both internal and external here the Installer is using base track connector clips now these just keep it all in place so that the aluminium doesn't Bend throughout the install we recommend depending on the thickness of the insulation try and get two clips per and start to track if obviously you're going for a thinner insulation you'll only be able to use one clip now what you do is you pre-drill holes along the lengths of the starts track about every 300 millimeters and hammer the start to track fixings in these are all plug fixings so very secure once installed as you've used the spirit level this is all perfectly straight you then apply and attach the clip on profile to the starter track this clip on profile it's a very easy to install bead and it slots over the front which means that when you come to put your EPS onto the wall and then do the base coat layer you have a bead that's already kind of connected easier to install and easier to finish off as opposed to just trying to go straight on to the starter track [Music] at the top of the system whereas at the bottom you have the start strike at the top you have the option of a verge trip now if the ewi system comes out and protrudes beyond the soffit at the top of the property you need to protect it and prevent any water from coming in and going behind the system this is where you would use a verge trip this is an angled piece of powder coated aluminium which is installed and fixed at the top to prevent water from sitting on top of the system and indeed going in behind to make sure that these have been installed correctly and are in fact level because there are once and so they are a very busy visible aspect of the system so you need to make sure that use Packers to give it this securest fix and so are they all level with the insulation below now these Packers can be used both down at the starter track level and at the verge trim and come in various different thicknesses to suit your installation so wants to start attract and the verge trims have been installed onto the wall you now apply the adhesive onto the back of the insulation boards now this board here is an EPS board which is an expanded polystyrene board it's a graphite board which means it has increased thermal performance and a slightly better fire rating than its white equivalent the adhesive on the back of the board can be applied in two ways they are applying around the perimeter with a couple of dots in the middle of the board as well [Music] this means that when you're installing onto uneven substrates you can in fact build up slightly on some areas of the board so that you can level it all out and make sure that when finished you get a flat surface so once you put the board on the wall once again push firmly to make sure it's installed correctly and you can obviously use a spirit level to make sure that the board has been installed flat here he is using a spirit level just to make sure that the EPS board that he is put on to the wall is level this is really important because towards the end of the job if you have not ensure that the boards are level you have clearly see an unprofessional finish [Music] the other method of sticking the boards onto the wall is just using an ox trowel and giving an even coverage across the whole of the back of the board this is a different method both can be used and sometimes it is down to the Installer as well as the substrate as to what method is used on that particular project the notch trowel method tends to be used when the substrate is incredibly flat already and you don't need to use the Don tab where you can build out the board to level it off so as you see here simply place the board up and again make sure that it is firmly on the board and then there's no chance there of that falling off or not having adequate adhesion on to the substrate once again use the spirit level to ensure that the board has been installed correctly [Music] the next stage are the mechanical fixings now what you see here is an EPS router that is caught out a small section of the EPS board to ensure that when the mechanical fixings go in they are covered to stop thermal bridging and minimalize cold spots please note that this is quite a messy job so make sure that you do tidy after you've done this job [Music] the EPS router is a very cheap and cheerful little tool that you can pick up in various distributions services once the hole has been drilled to suit the diameter of the fixing you then put the female part in followed by the male and use a hammer to mechanically fix the bores once the plastic fixings have been installed you then cover them using the thermal dowel caps these are made of white EPS and just prevent cold bridging happening through the fixings to make sure that everything is nice and level simply take an EPS wrap and gently go over the fixing holes to make sure that nothing for trude's as you see here he's making sure that all corners are nicely at right angles and there are no overlaps between connecting boards that can show through if not dealt with what you can also see while he's rasping the EPS boards is that they have been installed brick conformation so each board overlaps the next one as you come up the corners so as you see there you see one edge and then you see the other edge as it moves over the top this is to prevent any kind of stress causing cracks in the system one of the most important areas of the system to rasp is in fact the corner this is because when you come to do the corner bead come to reinforce the edges they need to be at a perfect right angle to make sure that you're not having to build out the base coat in order to fit the corner bead on one of the other reasons why you use the EPS rasp and rather than just leveling off the surface what it does is it removes any of the kind of oiliness that comes out after you leave the EPS on the wall for a long time if it is subjected to a lot of Sun then the EPS can actually give off a very small film of oil on the surface and this ApS rasps just takes that off so that the base coat can stick adequately onto that board here is also installing an under sill bead on the aluminium over sill which again similar to the verge trim at the top of the system ensures that no water rests on top of the es boards or in fact goes behind the system as well [Music] what the windowsill bead or under sill bead does is as it sticks to the underside of the over sill it really holds it down into the system so later on you don't get wobbly or fluffy over sills it is all contained and it's very secure which adds to the durability of the whole system the next step is reinforcement beading and mesh here he's cut in the corner bead to protect the edges of the insulation system around windows and on the corners of the property and here he is cutting reinforcement sections which go on stress patches around windows and door openings these are cut and secured in place using the base coat on these areas it's very important to double mesh as they are fragile areas that a lot of stress comes through the reveal bead corner bead and stress patches are all attached to the system and secured in place using the base coat it's very important not to use any metal fixings or anything like that to secure them in place once you've put a bit of base coat onto the wall these beads are then secured in place overlapping just to ensure that you don't have any areas that are fragile and may crack [Music] the corner beads are then measured using a spirit level to make sure that they are flat [Music] you then use a spirit level to make sure that the corner beads have been installed correctly [Music] and as you can see the under sill bead and reveal beads and stress patches are all tied together [Music] installing the stress patches on the corners of windows along with the EPS boards being cut in an l-shape prevent any cracking coming from these corners [Music] [Applause] [Music] one of the most common areas for poor or incorrect installs to fail is at these junctions and corners of Windows [Music] once you've installed the corner beads and they're reveal beads and the stress patches you can now look and focus down at the clip on profile which is attached to the starter track again you are just using the base coat just to tie in the mesh there at the bottom [Music] when all this is done you can then move on to base coating the whole offices as well as using the under sill bead or windowsill bead underneath the over sill they're also used at the top of the system much in the same way just to keep the verge trim secure and attached onto the EPS this is the high winds from rattling The Verge trims stop beads are also used at the end of the systems this is just to keep it nice and neat and tidy much like all of the beading it is there and designed to reinforce and to create nice clean edges corner beads are not just used around windows but also on all right angle edges and corners of properties and this highlights once again now you have to have very nice sharp edges of EPS boards always use the spirit level just to check the position of the corner beads [Music] what's all that the beading has been done it is time now to base coat and mesh importantly you are overlapping all of the mesh with the corner beads that you've already installed this means that you don't have any weak points and it increases the durability of the whole system so what he's done he has installed the layer of base coat already and he's rolled out the mesh placed it on made sure that it's overlapping everywhere and then he's just traveling over to pull through the base coat to make sure that that mesh is sitting in the top third of the base coat to prevent cracking the fiberglass mesh is overlapped at 10 centimeters at each side [Music] make sure that you overlap your fiberglass mesh by a hundred millimeters each side this will prevent any kind of cracks from happening it in between each roll after 24 to 48 hours depending on weather conditions you are then safe to prime using the topcoat primer this can be applied using a paintbrush roller or again much like the substrate primer can be sprayed applied as well once the base coat has been primed you are then ready to apply the topcoat the silicon thin coat topcoat can be applied using the steel trowel and plastic float option alternatively can be passed through a machine and spray applied so there you have it the complete installation guide for external wall insulation systems everything that was shown on the video today is available from ewi store coat UK if you don't know how much you need of anything we've got a nice materials calculator which will show you exactly the quantities required

Channel: EWI STORE

Views: 167,046

Keywords: ewistore, ewi, insulation, external wall insulation, shop, services, silicone render, plastering, plasterer, construction, builders, tradesman, how to, installers, properties, homes, housing, diy, gardening, krend, ewipro, scaffolding, thin coat render, store, explore, marketing, fyp

Id: 3ErmcO51SM8

Length: 20min 41sec (1241 seconds)

Published: Tue Mar 03 2020