It is top quality and the most cost effective product for your flat roof. While expensive, the best insulation is PolyISO rigid foam.
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If moisture is a major concern, you can also install XPS rigid insulation, which offers superior moisture resistance. However, PolyISO absorbs considerably less water, therefore if it gets wet, it looses only a small fraction of its insulating properties. These problems typically come out when its too late to fix the roof, and complete replacement is in order. The worst part about this: you will not even know its happening. Moreover, you are also risking that underneath this wet insulation, you roof sheathing and deck will start to rot.
Also, if a roof leaks and fiberglass insulation gets wet, it will loose most of its insulating properties. Our Take: Framing this out and buying 30-R fiberglass insulation will cost you about 50% more than just buying 5 inches of PolyISO (equivalent of 30-R).īecause it will take a lot of time to actually install all of this, you are risking major leaks, if it starts to rain before everything is complete. Then, install R-30 fiberglass batts between the rafters.
It should be installed on tapered 2x furring strips, in order to slope the surface of the roof toward drains. When a homeowner really needs to cut down on costs, some contractors may suggest the following:Īdd an additional layer of OSB over the sheathing. Mistake # 1: Save money by installing Fiberglass Insulation, and framing out roof slope using OSB board substrate Some so called “experts” online may recommend the following, claiming to achieve a greater r value at a lower cost.
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