Recommended Flat Roof Insulation Thickness

Inspecting your attic insulation.

Recommended flat roof insulation thickness.

Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. 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. See the department of energy s doe ranges for recommended levels of insulation below. Our range of high and optimum performance flat roof insulation products are suitable for use in a range of flat roofs.

Recommended roof insulation r value is 38 r but ideal is to have 50 r or more. Flat roof insulation thickness. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.

Whether the flat roof being installed will be walked on or not flat roof insulation board typically has a hard faced surface and good compressive strength both for extra stability and. Recommended home insulation r values. A flat roof should preferably be insulated from above. The typical u value of an existing uninsulated flat roof is 1 5w m2k.

R value is a measure of insulation s ability to resist heat traveling through it. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed. With solutions ranging from our optim r vacuum insulation panels to our therma range of pir insulation we can provide the best solution for flat roof insulation for roofs with mechanically fixed bonded or torch applied waterproofing systems. A higher insulation r value usually means a higher price point as well.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Better to have 3 or more. A layer of rigid insulation board can be added either on top of the roof s weatherproof layer or directly on top of the timber roof surface with a new weatherproof layer on top of the insulation. It should be of the maximum available thickness.

The table below shows what levels of insulation are cost effective for different climates and. This is best done when the roof covering needs replacing anyway. The higher the r value the better the thermal performance of the insulation. Insulation level are specified by r value.

As for insulation thickness it depends on how much you can afford. Using insulation board in a flat roofing insulation build up is a widely accepted industry standard as it s one of the best weight bearing insulation types.