How much insulation do I need in my flat roof?

The amount of insulation needed on your roof depends on the type of roofing system you have, as well as the insulation value of the materials you have or want to use.

How much insulation do I need in my attic?

The amount of insulation needed in a flat roof depends on a number of factors, such as the roof’s construction, the amount of exposure to sunlight, heat loss design and the insulation properties of your roofing system (see below). If you want an educated guess, we recommend the following:

How much insulation do I need in my attic for RV?

If you’re considering an RV flat roof, you’ll want to plan for adequate attic insulation. Use the same thicknesses you would for a conventional attic. While the R-value of an RV roof is lower, the area of the flat portion is much larger.

How much insulation do I need in a flat roof?

Again, we recommend at least 12-15″ of insulation on all flat roofs. The best flat roof insulation is cellulose and/or mineral wool batts. They’re lightweight, tough, and water-resistant and can be blown or installed from the rooftop.

How much insulation should be put in a flat roof?

Insulation in flat roofs should be placed strategically to prevent warm, moist air from the roof decking reaching the underside of the roof deck and to help maintain a consistent roof temperature. To prevent thermal breaks in the insulation from forming when the shingles freeze, use foam or mineral wool blankets, rather than batts, to fill in the gaps between the decking and insulation.