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Cascadian505
Member
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# Posted: 13 Oct 2011 03:31am
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Hi,
I'm building a 12x16 "shed" in an area on the East side of the Cascades, typically very dry but a lot of snow in winter. Will be placed on 4x8 PT mudsills on pier blocks on gravel filled holes. The pier blocks are at grade. I've already started building, had many people say non PT got the joists okay, but now having second thoughts. I've been tending to overthink everything which has slowed the project down. Any thoughts? That puts the bottom of the 2x6s 15-1/4" above grade (8" for pier block + 7-1/4" for 4x8 pressure treated.)
Thanks!
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rayyy
Member
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# Posted: 13 Oct 2011 03:36pm
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I think you'll be fine.P.T.wood is for any thing touching dirt or if it is wet most of the time.These joists will be high and dry under the cabin and protected from the elements.I'm doing the same thing with my cabin.
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MtnDon
Member
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# Posted: 13 Oct 2011 03:40pm
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Minimum clearance from the ground to the floor joist bottom is 18" in the IRC. So you're probably okay.
FYI, minimum beam or girder clearance, ground to beam bottom is 12 inches.
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Cascadian505
Member
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# Posted: 13 Oct 2011 06:27pm
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But my pier blocks are only 8" high?
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MtnDon
Member
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# Posted: 13 Oct 2011 06:55pm
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Quoting: Cascadian505 But my pier blocks are only 8" high?
But if the beams are PT that's fine. I should have said those are the minimums before you require PT lumber. Sorry.
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Cascadian505
Member
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# Posted: 13 Oct 2011 11:46pm
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Awesome! Thanks for the clarification. Just didn't want to make a mistake early in the game.
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toyota_mdt_tech
Member
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# Posted: 14 Oct 2011 01:30pm
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Quoting: Cascadian505 Hi,I'm building a 12x16 "shed" in an area on the East side of the Cascades, typically very dry but a lot of snow in winter. Will be placed on 4x8 PT mudsills on pier blocks on gravel filled holes. The pier blocks are at grade. I've already started building, had many people say non PT got the joists okay, but now having second thoughts. I've been tending to overthink everything which has slowed the project down. Any thoughts? That puts the bottom of the 2x6s 15-1/4" above grade (8" for pier block + 7-1/4" for 4x8 pressure treated.)Thanks!
Hey, you can treat those yourself. Get that "Jasco" woodpreserve, put in a pump up fertilizer sprayer and get a respirator mask and soem eye protection, go underneasth and preserve it. Great stuff, is green and no rot.
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davers
Member
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# Posted: 24 Nov 2011 01:07pm
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PT floor joist is a waste of money, there is no need to have the joist
treated. even in home construction there just plain.
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neb
Member
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# Posted: 24 Nov 2011 01:49pm
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Quoting: davers PT floor joist is a waste of money, there is no need to have the joist treated. even in home construction there just plain.
Exactly
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PlicketyCat
Member
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# Posted: 26 Nov 2011 06:58pm
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You should be fine, but if you're worried about moisture problems developing in the crawlspace created by the joists sitting on the sills, you can always install a vapor barrier under the house. Either plastic sheet the ground or use house-wrap/tar paper to cover the bottom of the floor joists.
Now... if you're worried about the exposed faces/ends of the joists coming in contact with high snow and getting wet (if you "laid" a box framed floor assembly on the beams instead of "hanging" the joists in them), then you can always use/add PT lumber for the rim joist or some other water proofing at the floor/wall base.
Easy-smeasy ;)
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