Does anybody have some input on concrete slab insulation above grade?
I am building a greenhouse and finished the slab Friday. I am stripping the forms today and want to bring the insulation from the spread footer to the top of slab so my in floor heat doesn't get lost.
The slab will extend about 4" above grade with 8" below to the footer. I was thinking of just running the blue board to the top, but in time that will degrade into little chunks of blue bits.
I plan on running about an 8" wide strip of pea gravel around the slab and need an idea for extending the insulation higher than that to preserve the heat.