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bgrodsky 01-04-2011 01:25 PM

Sun Room/4-season room - insulating floor
Hi, I have a sunroom, standing on stilts about 8 feet up and connected to our living room with a sliding glass door, that I (almost) converted into a 4-season room. I put in decent windows, put plywood and laminate flooring over the existing deck-style floors (sealing all the cracks in the original floor first). The problem is it is still very cold.
I would like to insulate the floor but am not sure how. My current plan of attack was to get fiber glass insulation between the 2x6 joists underneath the room and then put plywood on top of that, sealing all the cracks to make it air tight. Reasonable? Moisture problems? Others?

Ron6519 01-04-2011 01:32 PM

As for the insulation, I'd use a closed cell foam. Much better product.
You didn't mention a heat source for the room.

SteelToes 01-04-2011 01:55 PM

Yes i agree with Ron closed cell would be much better than fiberglass.
You said that your sunroom is 8' up of the ground it closed out under or is it all open?

bgrodsky 01-05-2011 06:49 AM

Thanks for the thoughts. The heat source is central gas heat, there is a powerful vent right at the outer edge of our living room/at the entry to this small (8x13) room. It is all open under the sunroom (there is an AC unit on the ground). That's why I was thinking once I get the insulation in between the joists I should put a plywood layer and seal to keep the air out. Then the concern is whether there would be moisture problems in that enclosed space (or if this would work at all...).

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