Extruded Polystyrene Under Pergo?

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Old 11-19-10, 10:59 AM
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Extruded Polystyrene Under Pergo?

I'm about to install Pergo flooring on a concrete slab, which is slightly below grade. Pergo instructions say to put a vapor barrier down over the concrete and Pergo on top of that. I would like to add a sheet of 3/4" or 1" ridgid foam [extruded polystyrene] under the pergo for better sound properties [the pergo sounds hollow on the concrete] and for a bit of thermal insulation too. I will add an additional sheet of plastic over the foam so the pergo can slide/float easily since it kind of 'sticks' to the foam.

Does anyone with a good knowledge of flooring systems think this is a bad idea?
 
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Old 11-19-10, 06:27 PM
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You should be using 3 in 1 underlayment that is sold next to it (its usually red). That should take care of the vapor worries, and anything under that should be fine as long as it's relatively level. The biggest pain would be worrying about crushing the foam while laying down the floor since there will be a lot of moving around and tight spots. Good luck!
 
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Old 11-20-10, 05:04 AM
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Starlite, if you have concerns regarding a Pergo warranty, use what they recommend. I just installed 1000sf of 5/8" engineered flooring and used the red stuff mentioned by caliback and it goes down well, has it's own sealing strip and doesn't give a squishy feeling. Putting down XPS will make it feel like walking on a trampoline. I would not do it.
 
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Old 11-22-10, 11:55 PM
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Thanks for your answers guys, I appreciate the help.
 
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