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pjm 10-20-2011 04:06 PM

Another crawlspace question
 
I have a small crawlspace under a closed in front porch. I'm trying to get it insulated better than it is now. The room is the coldest in the winter and the floor is cold to the touch. It's a dirt floor crawlspace with fiberglass batt insulation in the ceiling rafters, but it's pretty beat up. I'm in northern NJ. Here's what I was thinking of doing: Plastic on the floor and run it up the walls say about a foot or so? My question on that would be should I attach it to the wall somehow? Duct tape? Then I was going to either repair or replace the current batt insulation with the encapsulated stuff then maybe put some foam board up over it. I'm worried about moisture as it's a dirt floor. Does this seem like a good idea? I'd like to try and get it done pretty quickly as winter coming. Any ideas or thoughts would be greatly welcome.

Thanks in advance.

jklingel 10-23-2011 02:41 AM

See buildingscience.com. Generally, crawl spaces should be conditioned (sealed up, insulated, heated). If not, I'd insulate w/ mineral wool (Roxul) and put rigid foam, taped and caulked to air seal it, under the floor joists. VB on the floor is perfect; goo to the walls w/ Tremco Acoustical caulk, or the like. Try to avoid vapor impervious flooring, like vinyl. Any moisture sneaking in will settle in the floor sheathing, etc. Vapor-open flooring is better.

Windows on Wash 10-23-2011 10:03 AM

What should be done depends largely on the moisture and water table under the home.

If the crawlspace is not commonly wet, close it up and condition it. If it is wet, leave it ventilated and fix the insulation layer on the floor.

pjm 10-24-2011 08:18 AM

I'm not sure I understand the first response. Are you saying a vapor barrier under my floor on the porch? As far as the moisture it's not to bad here were in a high water table, but it's not deep enough as to where I've ever seen standing water in there it's just musty like a dirt floor basement would be. The porch is already finished so putting anything under the flooring is out unless I rip it all up and start from scratch which I can't afford to do. I guess I could go the mineral wool and rigid board way on the under side and leave the dirt the way it is and see what happens. I'm guessing if I wanted to do it right I would have to put concrete down and make a slab floor? Then insulate as needed and hope for the best? That's really not an option right now as it's a 8 X 20 porch. that's a lot of concrete and I've never worked with it so I would have to have someone come in and do it for me. Thanks for the replies I just really needed to know if there was anything I could do to the floor I've heard you could put a plastic sheet over it to keep the moisture out.


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