What's the difference between EPS and GPS insulation?

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What's the difference between EPS and GPS insulation?

Ronald Tetrault Feb. 3, 2021Last updated: June 29, 2021

While searching to purchase EPS boards, which are very difficult to find here in QC, I've bumped into a 4' x 8' x 1" thick board, called GPS.  Do you have a webpage about GPS insulation?  I want to insulate my existing basement concrete floor, on top of it.  I have very limited head room, no more than 5 ft where there is no pipes on the ceiling.  

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