Insulation type under Gyp-Crete?

What kind of insulation under overpour job?

Hey guys, What type of insulation have you liked to use best under the subfloor on an overpour job? I know fiberglass would work, but doesn't sound like much fun. I have used bubble wrap type on staple UP jobs. Has anyone used the spray on foam under an overpour? How much is recommended? This is my first overpour and I want to get it right. Any cool tips appreciated also.Thanks in advance. Kevin

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There are several noise insulation membranes on the market that are sold by gypcrete companies which are used to minimize transmitted noise to floors below.

You'd probably still want a radiant barrier below the floor.

Recent studies I've read about the value of a radiant barrier under concrete *basement* floors using bubble-foil-bubble products suggest that they are of minimal R-value, but I'm not sure that the studies really took into account full radiant effects. That said, I'm still using foil barriers but I am looking for more info to prove/disprove their worth.

http://www.maxxon.com/index.asp
http://gypsumsolutions.com/

Thanks Guys

I appreciate it. Anybody else have any experience with this? Kevin

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Gypcrete is used in hotels as a sound

and fire barrier. I have always used a simple fiberglass batt without any problem. The r value would depend on the space below. Is it heated below?

Insulation suppliers also offer special sound barrier insulation for partition walls, but again, I really don't see a need.

hot rod

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Gypsum, insulation

we have one architect that specifies 3/4" polystyrene over the subfloor before we tube and pour the floor. We glue it down, tape the seams and use the 1-1/4" wirsbo staples to go through the insulation and into the subfloor. It makes for a thick buildup. We have done a dozen of these and it seems to work well. Most of our work is insulated under the floor with fiberglass. Icynene works great too. Most of our jobs don't get insulation between floors. I was suprised to hear so many guys at wetstock say they feel this is needed. we haven't insulated 1st floor ceilings in the last 13 years of doing radiant. I am curious to hear others feelings. Always looking to improve but only if it makes sense. Any opinions?