XPS versus EPS Underslab Foam
Hi. I am back and forth on whether I should use XPS (blue board) or EPS for the insulation underneath my slab. I understand the qualities of each regarding water absorption and drying out, but would it (XPS particularly) affect the long term performance to the point where the slab is compromised? I also understand the pollution associated with XPS manufacturing. I have the option of purchasing 6" (house in very cold climate) of EPS (R-24) or 4" of XPS (R-20). The EPS is less expensive per inch, however, I need to pay for shipping which jacks up the price. It may be difficult to compare apples to oranges in this case, but when looking at R-value alone (and without heat load calcs performed), do you think I can recoup the $1000 more that I spend for the EPS for 4 extra "R's", in energy savings, or go with the R-20 XPS and save upfront? Any thoughts out there? Thanks in advance. The Q&A section of GBA has been very helpful.
Posted May 2, 2014 11:34 AM ET
Other Questions in Energy efficiency and durability
I recently had a metal roof installed on my house and am wondering if it was installed properly. The roof was installed over two layers of shingles. The roof is over 20 years old with damaged and raised shingles. The contractor applied the metal directly