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Discussion Starter · #1 ·
Is FORMULAR 150, 1" thick with a rating of R-5 enough for a standard walk-out basement? Will be gluing directly to the block. Should I go with 2"?
 

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Depends on where you are. Not enough for Fairbanks, too much for Atlanta...
 

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2 inch would be preferable in most northern states or Canada. So long as it doesn't present a problem for your design plan, then go for it! Worth the expense.
 

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Discussion Starter · #6 ·
So if I go with 2" from Home Depot (about $30 for 4x8 board) I'm looking at around $795 ... for the 3/4" tongue-and-groove (about $14.20 for 4x8 board) I'm looking at around $375. Any estimates on how long it will take to make that additional $400+ back in energy savings?
 

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So if I go with 2" from Home Depot (about $30 for 4x8 board) I'm looking at around $795 ... for the 3/4" tongue-and-groove (about $14.20 for 4x8 board) I'm looking at around $375. Any estimates on how long it will take to make that additional $400+ back in energy savings?
No way of telling for sure without running an energy model, but my guess is that over the life of the product you will at least double, if not triple, your investment with whichever one you choose to do.
 

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I agree with AGWhitehouse, above. Here are some figures on foam board and heating in a basement for a little comparison of savings generated; http://www.quadlock.com/technical_library/bulletins/R-ETRO_Value_of_Basement_Insulation.pdf

And the basics on thickness of board;http://www.buildingscience.com/documents/reports/rr-0202-basement-insulation-systems

http://www.eere.energy.gov/buildings/building_america/pdfs/db/35017.pdf

Explore this one, using "back" key; http://www.buildingfoundation.umn.edu/FinalReportWWW/Chapter-5/5-optimum-main.htm

Gary
 
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