Residential Flat Roof Insulation

As for insulation thickness it depends on how much you can afford.

Residential flat roof insulation.

Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. The type that is right for your flat roof insulation job depends upon the state of the roof expert opinion on the best type and your budget. Products are also inorganic non combustible and mold resistant. Thermafiber residential mineral wool blankets are ideal for insulating walls floor ceilings and attic spaces in homes.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. That accounts for its materials membrane insulation and decking as well as snow and rainfall and even for equipment like an air conditioner. With 2 6 rafters that s a tall order and jordan adds a couple of major caveats. The target should be to achieve a u value of 0 25w m2k or better.

Recommended roof insulation r value is 38 r but ideal is to have 50 r or more. Rockwool stone wool roof insulation combines the thermal performance dimensional stability impact resistance and acoustic control required to increase the performance of many flat roof assemblies. With a flat roof however this becomes a major concern. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board.

From there the flat roof system you choose will determine the materials you apply. Since your attic is insulated i would advise at least 2 of polyiso insulation in the roof for good measure. Flat roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules. These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance.

Better to have 3 or more. Rockwool products are available with a bitumen or mineral coated fiberglass face to be used in a number of roofing solutions. The roof is only four years old so removing it is not an option he says ruling out a layer of exterior rigid foam.