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Post by h3nry on Mar 5, 2013 1:21:58 GMT -5
Ok, so I'm planning a building. Its 30' x 30' and the trusses will be 4/12. With a 12" overhang. What I am confused about is the length of each half of the roof (peak to lower edge). I'm just looking for someone to confirm my maths lol So, 4/12 means every 12 inches from the edge it goes up 4 inches toward the peak. The trusses are 30' + the 1' overhang on each end so that's 32' 32 ÷ 2 = 16. (Were trying to make a triangle to solve for the longer side to know the length of the angled roof) 16 * 4 = 64 (64 inches, 5' 4") We now have 2 sides and an angle (  ° cause we cut a triangle in half) so.... we get around 16' 11" for the surface that will be the roof.... That's 507.5 sqft right? (30' * 16' 11") I focused my self doing that.... lol. Or for the whole roof its 1015sqft |
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Post by scootnwinn on Mar 5, 2013 1:33:04 GMT -5
Not bad but you forgot the over hang on the other 2 sides so add that in it should have been 32' X 33' 10" if it was me I would just figure 32 X 34. Also what type of roof? If its metal be sure your panels will end up equaling your length of 32 and not just covering your area. If its shingles add 10% or so for waste...
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Post by h3nry on Mar 5, 2013 1:42:56 GMT -5
Nice, I knew I was off somewhere!
Yes, asphalt shingle.
For all materials I am going to assume at the very least 10% waste, maybe more like 12% to guarantee the price quote I make my self is the Max needed
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Post by scootnwinn on Mar 5, 2013 1:53:46 GMT -5
Cool good thinking. A metal roof is not much more than the shingles and is way more durable, easier to install, and if you pick white much cooler in the summer. Its also harder for the wind to blow off and far less likely to leak. I wouldn't put shingles on my worst enemies house and definitely wouldn't give you more than a years warranty. I build for a living by the way... We haven't used shingles since I started with the company 5 years ago of course we don't build houses either...
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Post by h3nry on Mar 5, 2013 2:22:53 GMT -5
I was thinking a flat roof with tar paper and the like but an angled metal roof with spray foam on the underside, or good insulation on the roof, 1inch of spray foam on the flat roof. Flat roof for the actual roof but the metal to keep the water off
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Post by justbuggin2 on Mar 5, 2013 2:30:27 GMT -5
i would not go with a flat roof as water and snow will set there if it has a slope then it will run off and less likely to leak you can put like 1 to 2 inch ridged foam sheets under the metal roof for moe insulation
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Post by scootnwinn on Mar 5, 2013 2:46:47 GMT -5
If you are using trusses with a 4/12 pitch your roof isn't flat. Propanel with rigid insulation is the best way to go but even propanel on tar paper is better than shingles. You can always use batt insulation in the inside instead or in addition to the foam... The spray foam isn't much fun to mess with
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Post by h3nry on Mar 5, 2013 3:30:18 GMT -5
Well, I'm exploring my possibilities with the roof, the trusses are the only thing I have priced so far.
A "flat roof" with a 2/12 angle would be less work and less cash, I assume. Plus I'm in Arizona, not much snow here lol. Just a lot of wind and heavy rain/ hail (hence my idea of spray foam top layer, protects from hail damage to the wood)
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Post by scootnwinn on Mar 5, 2013 3:40:16 GMT -5
Spanning 30 feet without trusses or columns might not be a good idea... My brother in law is a structural engineer want me to ask him to run some calculations?
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Post by scootnwinn on Mar 5, 2013 3:41:30 GMT -5
Have you looked at pre-engineered metal buildings?
most places will require a permit for a building that size you will need an architect or engineers stamp for some permits depending on your location....
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Post by h3nry on Mar 5, 2013 4:22:21 GMT -5
This is supposed to be a house, so I expect some permits and engineers, trying to get as many ideas as I can with the dots and crosses. I'm using you! Haha (if u have seen "up" say the I'm using you! In the same tone the dog says "I smell you!") Anyways, it would have nice sized collumns in the middle somewhere as well as nice sized cross beams, think office building with the slanted roof... Something like this but 30'x30' and way less slant lol ![]() i.ebayimg.com/t/4X10-SLANT-ROOF-SHED-26-GARDEN-WOOD-SHED-PLANS-ON-CD-/00/$(KGrHqZ,!lQE3Hw50kcRBN2VysIl(g~~_35.JPG[/img] |
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Post by scootnwinn on Mar 5, 2013 9:18:04 GMT -5
If you can avoid columns you should. How many rooms just 1?
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Post by wutzthedeal on Mar 5, 2013 9:19:36 GMT -5
They have some nice apps available for these types of calculations (Android, i-phone,, etc.)
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Post by scootnwinn on Mar 5, 2013 9:27:21 GMT -5
BTW you aren't using me there is an invoice in the mail already  Just kidding. I know a lot of architects who can help... Look long and hard at those prefabricated metal buildings. It really make the whole thing easy and saves you on design fees... |
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Post by leftwayleft on Mar 5, 2013 11:16:25 GMT -5
When I added on to my house I bought 2 extra squares of shingles from same lot so if I need repairs down the road the shingles will match in color and style.
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° cause we cut a triangle in half) so.... we get around 16' 11" for the surface that will be the roof....
