HOW TO MEASURE A ROOF FOR SHINGLE REPLACEMENT

what is up everybody it is life's apprentice today i'm going to be teaching you guys how to properly measure a roof for a shingle install we're actually in a mobile home park or pre-fab home park here and we're going to be measuring this roof here so the first thing i always look for is how many layers there are usually by the ladder you can peel up underneath and figure out generally with some certainty how many layers there's going to be the next thing i'm going to do is i'm just going to look around for missing shingles possible rotten plywood things done improperly like this right here it doesn't appear that this flashing goes up underneath the shingles they have it tarred and it looks like it's probably not leaking at the moment but this is a potential leak spot i'm going to check all these boots you can see this is dry rotting obviously these get replaced every single time and then these are like pod vents which would get replaced for the attic ventilation now on mobile homes skylights are a little bit different but uh you're gonna look at skylights you can measure them and figure out uh what size you would need or flashing kits most skylights you can reuse these particular kind you cannot i guess you probably could but you can see how yellow they are these will definitely need to be replaced and then we're going to go through and get some measurements you can see how the roof lays out here it's generally just a ranch just a standard ranch but we do have this little dormer on the front and that's really the only thing on here that is makes it not a ranch i guess um so the first thing we're gonna do is we're gonna draw our rectangle and this is not perfect this is freehand this is how i measure roofs on a daily basis we can see that the ridge and the ridge meet so we're gonna come over here this is not perfectly center obviously you have like 15 18 feet here and probably 30 feet over there so it is offset a little bit so we're going to run our ridge straight across the middle like that we're going to run this we'll run it right about there this is not super crucial assuming that your measurements are proper and we're going to do that we know that this is the ridge we know that these are valleys so the first thing i'm going to do is i'm going to get this measurement here and this measurement here 14 11 we'll call it 15. we're gonna measure all the way across the ridge this thing's really handy for measuring roof but i don't know if you're a homeowner or you don't measure a whole lot of roof it's probably unnecessary but i really really like it so we have 63 feet now the next thing we're going to want to do is we're going to want to get this length from here to here and this length from here to here that's going to be important when you try to figure out the square foot of these triangles here so we know that's 22 and a half and based on this 63 measurement we can assume that this is going to be 40 and a half well we're not assuming we know that this is going to be 40 and a half because 40 and a half plus 22 and a half equals 63 so we know that measurement now now the next thing we're going to need to do is we're going to going to need to get this measurement here and this measurement here there you can see that's 12 and a half to there i'm generally rounding these numbers up um and that's just something that i do you don't have to do that so we know that that is 12 and a half right there and i'm in a tree but it's 30 and a half and i did measure this this is 15 as well same as the other side now the next thing we need to do is we need to get the length of this ridge and then we need to get the length of this rake edge here and the length of the valley the valley is not super important when it comes to measuring i'll show you that in here in a minute but i always take a valley measurement we're at 13 10 there so that's 14. and then here we have 10 14 10 and 17. and i'm going to go back home i'm going to put this on a white board and i'm going to explain exactly how to figure out the square footage and what kind of materials you need but when you're up here you're going to want to be looking like i'm counting one two three four pod vents these are two inch boots we need one two three four of those and then these skylights are something that i will have to get from a mobile home manufacturer these are not something you're going to be able to just get at a box store i don't believe depending on where you live i guess i've never seen them the mobile homes that i've replaced these on i have to get from basically the mobile home manufacturers all right here is the first roof that we looked at um and this has drawn a lot better and more to scale on the white board here i've transferred all the measurements over all of the original measurements are in black here and i'm going to go over basically how you figure out the square footage and how you're going to get all this figured out so we know that this back side was 63 feet by 15 feet so in order to figure out the square footage we're going to take 63 and we're going to multiply it by 15. that is going to give us 945 square feet now on this side it gets a little bit more complicated just because you have the um the triangles in here so what i've done is i've drawn these red lines here to just mark off the straight portion of this roof so we know that it was 15 feet by 30 and a half i'm going to multiply 15 times 30 and a half we have 457.5 square feet and i did the exact same thing over here um i did 12 and a half by 15. multiply that you're going to have 187.5 now here we i i've just drawn some lines here um to figure out these triangles the square foot of these triangles now we have 22 and a half feet from here to here we're going to subtract 12 and a half feet from that which is going to give us 10 feet here and we have 30 and a half feet here we're going to subtract that from 40 and a half we also have 10 here so in order to figure out the square footage of a triangle you're going to take like this length right here is 15 feet we know that because that is the length here so we're going to take 15 and multiply it by 10 and then divide it by two so 10 times 15 is 150 and we're gonna divide that by two and this is essentially how that works out is right here um this is 10 by 14 which is these other triangles but basically when you figure it out you're going to have 10 by 14 and then these triangles will make a square or a rectangle so you're gonna divide that by two so this is 75 this is 75 and here we know we have 10 feet here 14 feet here we're going to multiply those divide that by two since we have two we know that each one is seventy ten times fourteen is a hundred and forty divide that by two and we get seventy now the entire total is right over here eighteen hundred and eighty square feet so that is a pretty much an exact measurement you are going to have some waste you are going to have some extra shingles that are going to run up underneath the valley assuming you are doing a closed valley so you will have some waste here so if i was measuring this um which i am to bid this roof i'm not going to bid it at 1880 square feet i'm going to add to that and i'm going to figure about 20 square and that's going to allow for some waste if you have a little bit of uh maybe damaged shingles that come [Music] off the pallet that'll give you a um a good good estimate or you're not going to be short you'll probably at 20 square have two or three bundles left over now the other things you want to consider like i talked about on this roof there was four two inch pipe boots we had the two skylights over here i believe we had four pod vents if you're doing new edge you would figure out your gutter apron you would have 63 feet plus 30 and a half plus 12 and a half that would be your gutter apron as far as d edge you're going to need 15 15 15 15 10 and 10 that's how much gutter apron you will need and then to figure starter shingles you're going to just you know figure out the length of the perimeter if you're doing rake and um eve starter shingles you would just go around the entire perimeter to figure out your ridge you know you're going to need 63 feet plus 14 feet and you're going to want to round up a little bit on those numbers so that you're not short um and that's pretty much it i mean depending on the area and code requirements you'll want to figure out what how much ice and water shield you're going to need how much tar paper you're going to need i find a 20 square roof one box of nails and one box of staples is sufficient if you're going to be putting in valley metal you you you know that you have 17 feet plus 17 feet so you would probably want to just get a 50 foot roll of that and that is basically it that is how you measure a roof well that is it for this video um that's a pretty simple roof that gives you guys a a really good idea of how to measure a roof properly there are software systems out there and a lot of building companies and stuff if you bring them in a drawing they will um do the estimation for you but if you want to do it yourself this is essentially how you do it i am a professional this is what i do for a living so um you can trust what i'm telling you hit the thumbs up subscribe if you haven't if you have any questions leave them in the comments i will see you on the next one

Channel: Life's Apprentice

Views: 27,670

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Id: onqL0sJ_Z2M

Length: 12min 28sec (748 seconds)

Published: Wed Jun 30 2021