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Old 03-29-2012, 05:15 PM   #1
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subfloor on floor joists.


should i leave a gap between sheets of plywood when i screw them down/

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Old 03-29-2012, 06:02 PM   #2
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subfloor on floor joists.


Yes, and also make sure that you use the tongue and groove plywood or osb.

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Old 03-29-2012, 06:04 PM   #3
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subfloor on floor joists.


If you are using tongue & groove it is usually stamped on it, how much space to leave on edges and at ends. If left exposed to weather long it swells, and most spaces disappear. The thing is that the sheets are 96 inches long. If you leave the required spacing at the ends your plywood is running long after 4 or 5 sheets. Sooooo, I space edges and keep ends tight.end grain swells and shrinks very little.
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Old 03-29-2012, 10:58 PM   #4
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subfloor on floor joists.


What will be the final flooring?

T&G requires glue on the joists and in the groove. "(a) Edges of sub-floor panel must be supported by tongue and groove joints or solid blocking unless covered with underlayment, lightweight concrete, or wood strip flooring." http://www.apa-europe.org/Languages/.../PDF/R340G.pdf

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Old 03-30-2012, 04:37 AM   #5
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subfloor on floor joists.


Quote:
Originally Posted by Duckweather
If you are using tongue & groove it is usually stamped on it, how much space to leave on edges and at ends. If left exposed to weather long it swells, and most spaces disappear. The thing is that the sheets are 96 inches long. If you leave the required spacing at the ends your plywood is running long after 4 or 5 sheets. Sooooo, I space edges and keep ends tight.end grain swells and shrinks very little.
That's what saws are for.
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Old 04-03-2012, 11:03 AM   #6
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subfloor on floor joists.


thanks to all answers. i left about an 1/8 inch gap on the ends and glued the T and G to the joists.
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Old 04-03-2012, 11:44 AM   #7
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subfloor on floor joists.


depending on the manufacturer of the sheathing they will sometimes make the tongue larger than the groove depth wise so to create the required gap for expansion. the ends should be tight so to ensure proper alignment of the panels if not its very easy for the sheets to become out of square which makes each succeeding row harder to lock together
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Old 04-06-2012, 08:35 AM   #8
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subfloor on floor joists.


Hello guys, newbie here.

I understand the logic behind leaving gaps on the subfloor, but where do you leave the gaps if you are using toung and groove plywood? At the top and bottom?
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Old 04-06-2012, 11:08 AM   #9
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subfloor on floor joists.


T & G plywood has built in spacing. You will notice as it's being tapped together it's going to stop before it's tight.

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