Residential Flat Roof Insulation

To produce a hot roof rigid insulation is fitted outside above the weatherproofing.

Residential flat roof insulation.

This is then covered with a further weatherproofing layer. If insulation is installed below the flat roof deck this is called a cold roof. Consider geography budget and use for the roof to determine the best option. Cold flat roof insulation.

That accounts for its materials membrane insulation and decking as well as snow and rainfall and even for equipment like an air conditioner. Warm 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. This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls.

They are typically installed on top of single ply modified or low slope metal roofs. Spray foam insulation sprayed directly onto the roof deck and then coated with acrylic or urethane coating as well as a layer of crushed stones sand. Composite insulation works in flat and low sloped roofs with a variety of roof coverings. This may help with condensation but causes such a loss of heat that it has been banned in scotland.

Composite insulation reduces the need for a cover board when applying different membrane roof coverings. From there the flat roof system you choose will determine the materials you apply. Saint gobain insulation uk manufacture and supply glass mineral wool slabs and rolls along with rigid polyisocyanurate pir boards that can be considered suitable for a wide range of applications across flat roofs whether you re looking to insulate at joist level or above the roof deck in your flat roof construction. See the department of energy s doe ranges for recommended levels of insulation below.

Cold roof a very bad idea. Thermafiber residential mineral wool insulation commercial grade at home thermafiber residential mineral wool blankets are ideal for insulating walls floor ceilings and attic spaces in homes. 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. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

A note to consider before construction. Lots of traditional flat roofs are of the cold roof construction type. Cold roof systems are highly inadvisable as insulation from the inside will inevitably lead to the formation of condensation.