Looking for some 1-1/4" foam to lay under my aluminum floor. Going to need about 10' x 4' total. I want to make sure I'm getting the right stuff. Is this what I'm looking for?
https://www.lowes.com/pd_304089-210-304089.0_0__?productId=3122445&Ntt=foam+board&pl=1¤tURL=%3FNtt%3Dfoam%2Bboard&facetInfo=
https://www.homedepot.com/p/Owens-Corning-Foamular-InsulPink-R-7-5-1-1-2-in-x-2-ft-x-8-ft-Furring-Lap-Foam-43WD/100320293
Just by looking online, I don't see anything in 1-1/4" (the height of my ribs). Would I be better off going with 1" or 1-1/2"? Thinking the 1" might allow some flex in my floor and not provide a whole lot of extra support. But I'm also thinking the 1-1/2" is going to cause problems when I go to rivet my floor to the ribs and my angle supports.
https://www.lowes.com/pd_304089-210-304089.0_0__?productId=3122445&Ntt=foam+board&pl=1¤tURL=%3FNtt%3Dfoam%2Bboard&facetInfo=
https://www.homedepot.com/p/Owens-Corning-Foamular-InsulPink-R-7-5-1-1-2-in-x-2-ft-x-8-ft-Furring-Lap-Foam-43WD/100320293
Just by looking online, I don't see anything in 1-1/4" (the height of my ribs). Would I be better off going with 1" or 1-1/2"? Thinking the 1" might allow some flex in my floor and not provide a whole lot of extra support. But I'm also thinking the 1-1/2" is going to cause problems when I go to rivet my floor to the ribs and my angle supports.