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CamaroMan
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# Posted: 26 Sep 2025 09:45pm - Edited by: CamaroMan
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Hi - busy throwing ideas around here but considering 12" square blocks and filling with 1/2" rebar instead of messing with forms etc- trying to keep costs down.
Ill prob space them 6ft so will have a pretty strong base- top of a mountain ground is pretty solid with rock pretty shallow. Will prob go down 2ft and bring it up about a foot off the ground. Will be using cement board on the sides to keep floor warmer and moisture out-
planning 16x20 or there about- prob go 2x8 floor joists-
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Brettny
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# Posted: 27 Sep 2025 08:32am
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Skirting dosnt keep moisture out. In fact it can keep moisture in and will nee to be vented. Why not just insulate the floor joists and not skirt at all. Nothing to vent and your floor will be warmer because theres very little warmth in the ground in winter. In fact your more likely to have thawed ground under a skirted cabin in winter due to heat loss not ground heat.
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DRP
Member
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# Posted: 27 Sep 2025 12:54pm - Edited by: DRP
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Joist spans are here;
https://codes.iccsafe.org/content/VARC2021P1/chapter-5-floors
Use the 40 psf table, cliff notes.. 2x8 in common framing lumber is good to 12' span, 2x10 to 14', 2x12 to 16' span at 16" centers using #2 lumber of most available species.
The pic is from chapter 4 of the above link. a treated wood foundation on a gravel trench. No concrete, braced and with continuous floor support, recognized design.
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Grizzlyman
Member
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# Posted: 27 Sep 2025 07:22pm
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Look for bigger blocks. I used 18” square blocks and filled with concrete.
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CamaroMan
Member
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# Posted: 27 Sep 2025 09:30pm
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thanks drp will take a look
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