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rmckenzie
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# Posted: 12 Feb 2023 10:54am
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Hi all, thanks again for all the foundation advice previously. My 12x16 is going slowly but surely as I start to figure out a thing or two about how all this wood goes together!
I’ve now finished my concrete block pier foundation, built the floor frame, added insulation resting on treated OSB between the joists, and, just yesterday, put down a layer of Advantech subfloor.
I’ll try and throw up some pictures soon, but first, a question: as I finished laying down the subfloor yesterday I ran into the dreaded 1.5†gap between the last row of Advantech panels and the the end of the building. There’s just enough overlap that I was able to toenail the last sheet into the rim joist, but just barely.
I had read about this somewhere before, but forgot to plan accordingly, so now I want to know - what’s the best course of action? It seems too late to cut down the dimensions by an inch and a half. Is it just buying a couple sheets of Advantech or regular OSB and ripping a strip to fit in there? This seems like a non-ideal solution, but I’m scratching my head trying to come up with anything better.
Appreciate y’all’s advice - got plenty more questions coming once I get into building the walls, but wanted to try and figure this out first!
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gwindhurst
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# Posted: 12 Feb 2023 11:54am - Edited by: gwindhurst
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Yes, purchasing a sheet of Advantech is pricey just to make a filler strip... If it were me and/or you're on a tight budget I'd just make up the 1.5" width by x-length with some suitable scrap plywood of equal thickness to fully support your bottom plate(s) to fill the void. Just know moving forward that you will be continually challenged by your dimensional error...
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Brettny
Member
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# Posted: 12 Feb 2023 04:29pm
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Did you cut your floor joists 3in smaller than the length or width of the building?
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ICC
Member
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# Posted: 12 Feb 2023 05:22pm
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Does that mean the subfloor gap is at a gable end or along one of the long sides?
It is not ideal. The edge of the subfloor panel at the perimeter is supposed to be securely nailed to the rim joist. That strengthens the entire floor assembly. Toe-nailing does not count as secure. Perhaps, with only a 1.5" gap, you can infill with a strip to help support the wall and then nail the bottom wall plate securely to both the ends of the floor joists and to the rim joist. That may require some slight adjustment to wall stud spacing in that wall.
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Brettny
Member
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# Posted: 12 Feb 2023 06:31pm
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Either way honestly I would pick a side, remove the rim joist and cut 1.5in off the floor joists then reinstall. Even if you have to take appart some other stuff and trim other things.
The alternative is to slide the full sheet over to the end with the gap and put a 1.5in filler strip in the middle of the floor. If you do this I would add blocking between each joist.
All these options start to add up($$) over just taking stuff appart and cutting what you alreaty have.
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rmckenzie
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# Posted: 12 Feb 2023 07:48pm
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Hi all, thanks for the feedback so far. Maybe I can clear up a couple things:
I looked again today and the gap is probably closer to 7/8â€-1â€. This is on the 16’ side. Because of the, there is some overlap of the last row of subfloor and the rim joist that I was able to get the nail through, but it’s not a ton.
I did cut the joists 3†smaller: the true dimensions of the building are 12x16. I think the gap is just caused by the overlap in the T&G shaving off a fraction of an inch per sheet.
Does this change the advice at all? Is just filling in a strip more acceptable because there is some overlap of the subfloor and rim joist? With the nails and glue that are already on that rim joist, I’m pretty dubious of my ability to get it off without really having to tear up a lot. But better now than later I suppose! Thanks again for all your help!
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DaveBell
Moderator
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# Posted: 12 Feb 2023 11:21pm
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Measure twice, cut once planning we have all heard.
Measuring before installation may be a good idea.
I am surprised they don't use 4' 1/2 x 8' 1/2 before cutting the T&G.
This is a pic from Perkins Builder Brothers on youtube installing Advantech subflooring.
I guess the factory starts with 4x8 then cuts the T&G.
RM, I would add blocking on the inside perimeter and the strip of plywood so the wall rest on a firm structure. .
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DaveBell
Moderator
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# Posted: 12 Feb 2023 11:57pm
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Tongue & Groove Panel Size: 4' x 8' (Actual face dimensions for tongue & groove panel are approximately 47-1/2" x 95-7/8")
Installation manual on Lowes.com
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NorthRick
Member
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# Posted: 13 Feb 2023 03:20pm
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Quoting: rmckenzie My 12x16
Just cut a strip that fills the gap and keep going. Not the end of the world.
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Aklogcabin
Member
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# Posted: 14 Feb 2023 11:06am
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Cut a fill strip , no big deal
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