R Value Of Asphalt Roof

You should of course see the manufacturer provided technical data sheet for the r value of specific products.

R value of asphalt roof.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Rsi r value système international is the metric equivalent. For a very good introductory overview article on r value see r values over at the website of. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

R value of building materials material r inch r thick ness fiberglass inch 3 00 1 inch 4 00 inch 6 00. Asphalt roll roofing peel and stick roofing torch down roofing flat roof brown roll roofing roofing materials related products liberty 3 ft. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. R value of various materials.

Asphalt shingle roofing costs 2 000 to 10 000 for installation and materials. Longer lasting options tend to range higher between 11 000 and 14 000. Labor costs around 2 3 per square foot 200 300 per square and 3 000 4 500 for a 1 500 square foot roof. To convert rsi to r value multiply the rsi by 5 67826.

R value is used in the united states. Get free shipping on qualified asphalt roof shingles or buy online pick up in store today in the building materials department. Per bundle 30 pieces model 0840552 49 95 bundle 49 95 bundle. R3 r18 r21 total roof r value.

The increase r21 r3 exactly 18 the value by which you are increasing the r value. The rosemont il based national roofing contractors association nrca recommends that cover boards be used of perlite gypsum board or mineral wool to avoid possible blistering. Roofing materials asphalt shingles 0 44 wood shingles 0 97 windows single glass 0 91 w storm 2 00 double insulating glass inch air space. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Ft sbs self adhering cap sheet roll for low slope roofing in black. Gaf timbertex pewter gray double layer hip and ridge cap roofing shingles 20 lin.