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Old 03-28-2014, 12:03 AM   #1
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HElP with Template Plywood Underlay


Hey this is my first time laying down any kind of underlay that requires to make cuts.

Im wondering whats the best way to find dimensions needed for each 4 by 4 feet of plywood that needs to be cut in my bathroom.

I found out one way from youtube for vinyl they used a fiber paper to template the hole floor and made one hole piece for the vinyl. do I go about this with the same idea?
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Old 03-28-2014, 11:51 PM   #2
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HElP with Template Plywood Underlay-img_1987.jpg

HElP with Template Plywood Underlay-img_1988.jpg

HElP with Template Plywood Underlay-img_1989.jpg

hey feel free to make any comments I think I can use all the help I can get..

after I screw the boards into place. am I good to go and start tiling? or should I fill in the gaps left behind by my cuts?
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Old 03-29-2014, 12:08 AM   #3
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also should I be concerned about the wood expanding because its quite tight to the walls?
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Old 03-29-2014, 12:21 AM   #4
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You should be using a cement board instead of plywood. It doesn't hold moisture so it wont rot or expand when wet. Cement board is only 3x5. I just measure it out but for a first timer making a template might be better.
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Old 03-29-2014, 08:06 AM   #5
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#1 Your using the wrong type plywood. That's CDX, you needed A-C. It's not going to work because it's full of voids in the plys.
#2, I never would have used 4 X 4 sheets, way to many seams.
Back up and tell us what's under that floor, size of joist, spans, subfloor thickness, thickness of that underlayment.
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Old 03-29-2014, 08:14 AM   #6
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Could you tell us what you are using for the finished floor?

Sheet vinyl? Ceramic tile?
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Old 03-29-2014, 08:21 AM   #7
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Sounds like there going with vinyl Mike.
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Old 03-29-2014, 08:59 AM   #8
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I've read this several times and I'm not sure----if the OP could respond??
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Old 03-29-2014, 09:34 AM   #9
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Tile is going down.. You telling me i can tile on that? Ive heard i can its just not the best idea to do so.. Ive heard to use flexable adheisve or a plywood motar
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Old 03-29-2014, 09:35 AM   #10
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I needed to use 4 by 4 to fit it into my truck
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Old 03-29-2014, 06:11 PM   #11
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It is best to set ceramic tile one a cement backer board---plywood is a poor choice for a tile backer as the materials expand at different rates--

1/4" thick wonder board set into a bed of fresh thinset--then nailed down with roofing nails---
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Old 03-29-2014, 06:44 PM   #12
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I know man but as you can see the plywood is already all cut out
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Old 03-30-2014, 09:29 AM   #13
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The plywood you installed is fill of voids! Not going to do any good just filling in the exposed knot holes, the voids are all through the plys.
Voids flex, flexing causes the tiles and grout to crack.
It's not underlayment rated. Would have been ok for a subfloor but not underlayment.
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Old 03-30-2014, 10:59 AM   #14
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Leave the plywood---make sure it is secured and add the backer on top---

Tile over plywood is a risky installation--the backer board is your insurance--the time and cost is minimal---your call---
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