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Insulating under cabin

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Aug 15, 2013, 09:46 PM
august70
Insulating under cabin
I have an old 1 story cabin on a granite fieldstone foundation. The under the cabin, the ground is dirt. In the winter the wood floors in the cabin get very cool and the air comes through the spaces between the hardwood flooring. I have added fiberglass in the floor joist from under the cabin and covered in plastic, but have to replace about every year as the mice and chipmunk nest and pee in it and totally ruin it. I am thinking about using and open cell spray insulation on the entire underneath of the cabin and adding a 4mm+ plastic to the ground.

I am hoping the I can get useful feedback about what I am planning on doing with the spray insulation and ground covering.

TIA
Paul

This message has been edited. Last edited by: august70,
Aug 15, 2013, 11:05 PM
Jaybee
Sadly, any type of insulation will become critter fodder. The only option would be to skin the underside of the joists after installing new insulation. Even at that, it's very difficult to get a 100% seal that keeps out mice. A mouse can fit through a hole not much larger around than a pencil so any gaps will make an opening. If you have enough room to move around under there then maybe you can install a plywood skin to seal any gaps. Otherwise, they will find any openings.

Of course, there is always the poison, electronic repellants or the old reliable fake rubber snake or two.


Jaybee
Aug 16, 2013, 11:30 PM
SturdyNail
Jaybee, would Paul (august70) use pressure treated plywood to skin the underside of the joists?
Aug 17, 2013, 05:43 PM
Jaybee
It would not have to be pressure treated, just painted or sealed. There is no ground contact and the house system provides a roof so that it will not get wet. Any regular plywood will work. I prefer to add lattice strips over all joints and around the perimeter to seal up any tiny openings.


Jaybee
Aug 17, 2013, 08:42 PM
Sparky617
How would blown cellulose insulation do with the mesh used to hold it in place? When they make the insulation they treat it with borate to keep the bugs and mice out of it.

If it were my place I'd look at trying to make the crawlspace a conditioned space by insulating the foundation, covering the floor and then throwing a little heat and/or AC down there depending on the season. Not sure how well it works on an old stone foundation though.


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