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paulz
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# Posted: 24 Dec 2024 02:02pm
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I’m sure you’re right but it did say it does everything but cook dinner. If nothing else it will smooth out any seems in the plywood (which has air gaps I’m sure) and make the floor a touch softer.
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Tanner
Member
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# Posted: 2 Jan 2025 09:03am
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My new construction camp (1000 sq ft) in central New Brunswick (CA) required (building code) R40 floor insulation. Two layers of R20 between the joists. Wasn't fun. Insulation laid in from above (before subfloor), 7/16" OSB to protect if from the bottom. Did it as I laid the joists; started at one end and worked backwards, so only 8 feet at a time. Made a funky rail system that I would screw to the underside of the joists, then I could slide the osb into place, then nail into place. I work alone; this system served me well. Never had more than 1.5 feet of space down there, sometimes as little as a foot. Being a small guy helps!
Gary
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socceronly
Member
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# Posted: 26 Jan 2025 09:18am
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Quoting: ICC My cabin has R25 glass batts from underneath with the underside of the joists completely sheathed in 3/8" plywood. There's a minimum of 19" of work space to the ground though.
Are the joist bays vented in some manner?
And did you put a vapor barrier on top?
Just figuring out my floor insulation plan.
Was going to raise the walls a bit and put down XPS on the subfloor over the joists.
Thanks
JM
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gcrank1
Member
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# Posted: 26 Jan 2025 09:28am
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Raise the walls?
Do you mean the XPS will go under the wall sill plates?
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socceronly
Member
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# Posted: 26 Jan 2025 11:00am
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Quoting: gcrank1 Raise the walls? Do you mean the XPS will go under the wall sill plates?
Oh, no no... just so doors and such can be installed normally. Not so much raise the walls but the bottom of the door jams.
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Brettny
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# Posted: 26 Jan 2025 06:05pm
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In cold climates the issue I can see about putting foam between subfloor and finished floor surface in a building with interior walls and such is there may be sections that dont get Insulated. All it takes is a small section and you can get alot of frost showing up in your floor.
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travellerw
Member
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# Posted: 26 Jan 2025 10:44pm - Edited by: travellerw
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I raised all my stuff and did foam, then 3/4" OSB, then finished floor. I used accoustical sealant to secure the vapor barrier to the bottom plate, and made the vapor barrier long enough to tuck under the foam by 4". I think we used 2" foam.
After the cabin gets heat soaked we can walk around in our socks even when its -30C.
If you haven't built yet and have the opportunity to plan and do it like I did, its totally worth it. Super warm, well sealed and best of all no rodent issues.. and no working under the cabin.
Since our cabin is fairly small (16X28 with a 2/3 loft) we took extra care on the insulation. It has really paid off as we have stayed at -40C (-40F) multiple times and it takes barely any wood to keep the temperature once everything is heat soaked.
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travellerw
Member
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# Posted: 26 Jan 2025 11:15pm
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I thought I would post and image to show what a cross section of our floor looks like.
The only real downside is when you install baseboard there is no bottom plate to nail too (as the floor is now above it). You need to nail the baseboard to the studs top and bottom.
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paulz
Member
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# Posted: 28 Jan 2025 12:53pm
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Finally remembered to check temps when I got here yesterday using my handy point and shoot gun. Floor was 41, wall 42. Humph. This morning, after a night of wood stove, floor 54, wall 62. Cabin 66.
I haven’t done any floor insulation. Since it’s pretty even cold, not sure I’ll bother. Once the place heats up, cold floor feels ok.
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socceronly
Member
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# Posted: 28 Jan 2025 05:25pm
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Quoting: travellerw The only real downside is when you install baseboard there is no bottom plate to nail too (as the floor is now above it). You need to nail the baseboard to the studs top and bottom.
Great point.
I could just put some blocking in for that at the right height.
Thanks
JM
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socceronly
Member
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# Posted: 28 Jan 2025 05:26pm
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Quoting: Brettny In cold climates the issue I can see about putting foam between subfloor and finished floor surface in a building with interior walls and such is there may be sections that dont get Insulated. All it takes is a small section and you can get alot of frost showing up in your floor.
No interior walls, and it will be three season. Will be some cold days in the bumper seasons, but mostly this will be for AC.
If I am there when it's minus 30 something has really gone wrong...LOL.
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