I'm starting the process of finishing my nearly full height (7'2") basement and am costing out the insulation. Based on my research of what's best below grade, I'm debating between XPS foam panels (DIY) vs. sprayed closed cell (definitely not DIY).
Based on the cost of the panels at HD ($31) vs. professionally sprayed foam ($1/board ft. quoted) it looks like the cost differential for my square footage (~140 lineal ft.) at 2" depth is about $600. There is a $400 utility company rebate that I would qualify for if I got it sprayed. This is close enough for me (~$200 after rebate) that I'm thinking that I shouldn't bother with DIY and just have it sprayed by a pro.
Is there something that I'm missing in my math below?
137.6 lineal ft. 7.2 height ft. 986.0 sq. ft. 2 in. depth 1972.0 board ft. $1.00 closed cell spray foam per board ft. $1,972 closed cell spray cost (contractor -$400 utility rebate) 38 XPS (4x8) sheets $31.22 Home Depot per sheet price $1,186 XPS sheets cost 4 Foamular JointSealR tape rolls (90 ft. per roll) $36.00 Foamular JointSealR tape cost/roll $144.00 XPS tape cost 12 GreatStuff cans $4.00 GreatStuff can cost $1,378 XPS insulation cost (DIY)