I will soon be sealing my crawlspace with plastic sheeting across the floor and up the concrete walls. I plan on then adding rigid foam insulation.
My reading of the Residential Code is that I will need to install a thermal barrier over the rigid foam board to add protection against ignition. The layers of material are:
earth---concrete---plastic sheeting---foam board---thermal barrier---crawlspace air
Typically, a thermal barrier is provided by 1/2" gypsum board. My issue is that this is a crawlspace. I am not planning on installing studs to support wall board.
- Do I need to install the barrier in a crawlspace?
- What would I use as a barrier since I don't have studs to hange wall board on?
- Is there an alternative that I am missing?