Residential Flat Roof Insulation

To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity.

Residential flat roof insulation.

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

With 2 6 rafters that s a tall order and jordan adds a couple of major caveats. These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance. Pros and cons for flat roof materials all three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof. Since your attic is insulated i would advise at least 2 of polyiso insulation in the roof for good measure.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. Thermafiber residential mineral wool blankets are ideal for insulating walls floor ceilings and attic spaces in homes. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. Products are also inorganic non combustible and mold resistant.

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. The target should be to achieve a u value of 0 25w m2k or better. 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. The roof is only four years old so removing it is not an option he says ruling out a layer of exterior rigid foam.

From there the flat roof system you choose will determine the materials you apply. Rockwool products are available with a bitumen or mineral coated fiberglass face to be used in a number of roofing solutions. That accounts for its materials membrane insulation and decking as well as snow and rainfall and even for equipment like an air conditioner.