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Old 05-03-2010, 11:47 PM   #1
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How to repair the jigsaw subfloor to prepare for tile/stone installation


The bathroom sub floor was cut to lay/move some pipes, then I put the pieces back together and nail them back to the joist. Do I need to fill the cracks ? Do I need another layer of plywood if I want to install tile/stone later? What should the layers be?

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Old 05-04-2010, 06:59 AM   #2
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How to repair the jigsaw subfloor to prepare for tile/stone installation


If the original subfloor is 3/4 inch--add another 1/2 inch on top. then Durrock.

If the original 'Jigsaw'' is not structurally sound--you should replace that first.--Mike--

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Old 05-04-2010, 09:26 PM   #3
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How to repair the jigsaw subfloor to prepare for tile/stone installation


Make sure that any small patch is supported by 3 joists minimum. A small piece of plywood subfloor is not structurally sufficient if it rests only on 2 joists. Of course adding the second layer of "underlayment" grade plywood may fix that in this case. Regardless of the subfloor you need 2 layers of plywood for natural stone tiles. In addition the the subfloor you'll probably need to stiffen the joists too.

After you take care of the subfloor requirements you can choose a CBU, such as Durock or Hardie, or a membrane such as Ditra or one of Noble's fine products.

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Old 06-08-2010, 03:53 PM   #4
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How to repair the jigsaw subfloor to prepare for tile/stone installation


The first layer of plywood (3/4") is perpendicular to the joists but does it matter whether the 2nd layer of plywood (1/2") be perpendicular to the joists as well ?
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