Plywood Subfloor - Does It Need Gaps For Expansion? - Flooring - Page 2 - DIY Chatroom Home Improvement Forum
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Old 01-29-2014, 12:03 AM   #16
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IMO, walk on it between joists, if it deflects- it won't get any stronger.... all plywood requires end gaps for expansion as it changes with RH from seasons- roof/wall sheathing, subfloor/underlayments; http://www.google.com/url?sa=t&rct=j...KEftFQ&cad=rja

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Old 01-29-2014, 12:17 AM   #17
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Ok. To do it right, you need 1/2" plywood over the planks. And then for a smooth surface for the vinyl, you need 1/4" underlayment grade plywood stapled with narrow gauge staples, every 4" to 6" in the field and every 2" to 4" on the edges. The ends needs to be staggered and I always filled the seams with cementious based fill, although some installers don't. Might as well do it by the book, if you are going to do it. I am Armstrong vinyl certified (went to their vinyl/lino school) and have been installing since 1973. And you do need a small gap between the plywood and the wall. All wood expands and contracts.
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Old 01-29-2014, 12:31 PM   #18
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NA

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Old 01-29-2014, 03:14 PM   #19
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I do use lots of Allure.I have put in 4 floors of it this week.We use 5/8 T&G under(and PL400 on the joists if we have to remove the existing floor) it if the floors are iffy..Pad then lay the floor.I have put lots of it over 3/4 wood floors where the floor were in good condition and we put 30# felt and then the Allure Trafficmaster and the floors were fine assuming there is a good floor under.Some of the clients don't like the extra pad under them that's why we use the paper..Many of them have been fine for years.I would however follow the manufacters suggestions.
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Old 01-29-2014, 03:28 PM   #20
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Joe is right on about this but there are ways to help the problem if you must use the product on substandard floor.On a budget or a rental.If your subfloor has a raised edge here and there you can take a piece of 30# felt about 6" wide and staple it to the raised seam in the affected area and buld it up to where the tile lays good.I don't recommend this but thought I would throw it out there for the folks that are going to save a dime either way.
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Old 01-29-2014, 09:55 PM   #21
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Thanks Gary, Rusty and Mako for advice and links.

I do prefer doing it the right way. I don't want to put in $2k worth of flooring only to have the subfloor give.
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