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R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Perma "R" Products R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

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Is this a 25PSI foam, suitable for under 5" concrete? R TechIV Compressive Strength (psi, 10% deformation)


This is NOT techIV. Yes, IV is 25psi and literature indicates underslab. Your slab material will weigh approx 2,000# per 4x8 area. Know how is a must!

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