Residential Flat Roof Insulation

Insulating a roof from inside is technically feasible.

Residential flat roof insulation.

Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. That accounts for its materials membrane insulation and decking as well as snow and rainfall and even for equipment like an air conditioner. As for insulation thickness it depends on how much you can afford. 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.

Recommended roof insulation r value is 38 r but ideal is to have 50 r or more. 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. 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.

Since your attic is insulated i would advise at least 2 of polyiso insulation in the roof for good measure. Can a flat roof be insulated from inside from the ceiling of the area below. Better to have 3 or more. It s what s called the cold roof principle.

Rockwool products are available with a bitumen or mineral coated fiberglass face to be used in a number of roofing solutions. Products are also inorganic non combustible and mold resistant. To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity. These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. 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. This system was often used in the past but is not recommended nowadays. In fact it may cause damage in the long term.

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.