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Small Cabin Forum / Cabin Construction / Under cabin insulating
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Princelake
Member
# Posted: 17 Jun 2019 17:29
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I didnt want to high jack the other thread discussing this so hes my thought. I'm on bare bed rock and plan on pressure washing dirt that's in the rock. Build my cabin on piers put roxul insulation cause its moisture resistant and use the 1/4" metal mesh then skirt in the cabin right down to the bedrock with the mesh all the way around and then put a solid skirting like pressure treated plywood. It would be a pretty uninhabitable under there if anything could get under there. At the most the odd bug? Or roxul it and use tin the entire bottom and seal the joints?

rockies
Member
# Posted: 17 Jun 2019 19:09
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When you enclose the underside of your cabin with a solid skirting you in effect turn it into a crawlspace that will trap warm air and moisture which will then lead to mold and rot.

neckless
Member
# Posted: 17 Jun 2019 19:13
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must be vented

rockies
Member
# Posted: 17 Jun 2019 20:05
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Venting can make it worse. You may not think you are building a crawlspace when you enclose your pier foundation, but you are.

https://www.greenbuildingadvisor.com/article/new-vented-crawl-spaces-should-be-illega l

Princelake
Member
# Posted: 18 Jun 2019 07:16
Reply 


I'm building right on rock pressure washing away any organic life it basically be a slab no gasses nothing for mold to grow on. Water will drain away from the cabin. In a perfect world I'd live there and treat it as a basement and insulate the skirting and have it as a heated space. It's an occasional use cabin that I use on the weekends and when I can book a week or 2 off a year. I plan to use it in the winter and being in the coldest place in canada haha heated with a wood stove just insulating the floor and trying to heat a smaller space is the way to go in my brain. This past winter it was -58 plus wind chill for 2weeks not sure if I'd want to be there when it's that cold but it could happen.

rockies
Member
# Posted: 18 Jun 2019 19:24
Reply 


It is not necessarily water coming up from the ground or even water running in from the sides (ie a rainstorm or nearby creek) that will cause moisture issues, it's the moisture in warm, humid air that can condense in a cooler, dark place and cause mold and rot on the underside of your floors system.

Moisture can also be driven through walls by sunlight.

https://www.greenbuildingadvisor.com/article/when-sunshine-drives-moisture-into-walls

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