R Value For Hawaii Roofing

The higher the r value the greater the insulation performance.

R value for hawaii roofing.

Rsi r value système international is the metric equivalent. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. When determining how much insulation you need don t guesstimate calculate. Energy star roof surfaces.

R value measures how well certain building insulation materials can resist heat. Notes to the table above. Recommended home insulation r values. R value state local al alabama 2015 alabama commercial energy code 2 r 25 3 r 25 state.

Roof insulation should be installed in direct contact with the air barrier and is part of the building thermal envelope. For a very good introductory overview article on r value see r values over at the website of. As we said before the r value measures the thermal resistance of a material. Rc roofing hawaii roof contractor company oahu honolulu hawaii video introduction free inspection r c roofing hawaii is locally owned with over 50 years of combined roofing experience including roofing installation replacement preventive maintenance and emergency repairs.

Know exactly how much you need with our project calculators. R value is a measure of insulation s ability to resist heat traveling through it. Hi amendment to c503 3 1. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

R value wood frame wall r value mass wall r value floor r value basementc wall r value slabd r value depth crawl space wall r value 1 1 20 0 75 0 40 see section 402 1 1 1 13 3 nr nr nr nr 2 0 75 0 75 0 40 30 13 4 13 0 0 0 3 0 65 0 65 0 40e 30 13 5 19 0 0 5 13 4 except marine 0 40 0 60 nr 38 13 5 19 10 13 10 2 ft 10 13 5 and marine 4 0. R value of various materials. The higher the r value the better the thermal performance of the insulation. No credit can be taken for the insulation r value.

R value is used in the united states. 2 r 20 3 r 20 4 r 20 state only hi hawaii 2015 iecc 1 r 20 state local id idaho 2012 iecc 5 r 25 6 r 30 state. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. 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.

Notes on the r value k values of different forms of asbestos. Insulation level are specified by r value. Watch video and learn about our free roof inspection. Minimum r value non residential above roof deck 19727 57th avenue east puyallup wa 98387 web.

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