Residential Flat Roof Insulation

Since your attic is insulated i would advise at least 2 of polyiso insulation in the roof for good measure.

Residential flat roof 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. Insulating a roof from inside is technically feasible. Recommended roof insulation r value is 38 r but ideal is to have 50 r or more. The typical u value of an existing uninsulated flat roof is 1 5w m2k.

Better to have 3 or more. Can a flat roof be insulated from inside from the ceiling of the area below. That accounts for its materials membrane insulation and decking as well as snow and rainfall and even for equipment like an air conditioner. 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. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation. Products are also inorganic non combustible and mold resistant. These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance.

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. Rockwool products are available with a bitumen or mineral coated fiberglass face to be used in a number of roofing solutions. With a flat roof however this becomes a major concern. 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. Thermafiber residential mineral wool blankets are ideal for insulating walls floor ceilings and attic spaces in homes. To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity. This system was often used in the past but is not recommended nowadays.

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.