insulaton for porch floor


Old 01-04-05, 11:33 AM
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insulaton for porch floor

I am converting a screened in porch to a "family room". Windows are installed and the walls have been insulated. The floor is currently decking boards that will be pulled up and replaced with plywood subfloor then hard wood floors. The space beneath is dirt covered by a plastic vapor barrier - max distance between dirt and joists is about 12". What is a good way to insulate and is another vapor barrier required? Is there any concern for mold formation - water does not appear to get into this area? Space is vented slightly.
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Old 01-04-05, 03:37 PM
Join Date: Nov 2001
Location: USA
Posts: 1,873
Insulate before you install the floor. Staple the faced insulation to the floor joist facing the floor and not the crawl space. There isn't anything wrong with this installation provided the crawl space is ventilated. It will work the same way as attic ventilation does with the plastic on the dirt floor as being roofing shingles and faced insulation in both cases.

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