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Old 07-03-2012, 10:40 AM   #1
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Hardiboard on OSB


I'm installing Hardiboard on the original OSB 5/8" ply that the house was decked with (took up old 1/4" ply that was down because there was some water damage by tub.
What thinset is safe to use under Hardiboard on the OSB substrate?
Based on the pictures of previous water damage, should I cut this section of OSB out and replace it or just put the Hardiboard over it since it is dried out now?
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Hardiboard on OSB-image-2288802714.jpg   Hardiboard on OSB-image-4199991400.jpg   Hardiboard on OSB-image-2892554217.jpg  

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Old 07-03-2012, 12:54 PM   #2
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Hardiboard on OSB


I would cut it all out and replace with Advantec subflooring, there was also suppost to be a layer of at least 3/8, but 1/2" would be better underlayment rated plywood down before the tile board to add strength to the floor.

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Old 07-03-2012, 01:05 PM   #3
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Hardiboard on OSB


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Originally Posted by joecaption
I would cut it all out and replace with Advantec subflooring.
Cut out all the OSB or cut out all of the damaged area?
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Old 07-03-2012, 01:16 PM   #4
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Hardiboard on OSB


You have a lot of damaged goods there---I believe you will be better if pulling out all the old and replacing with 3/4" AB exposure one plywood--then set your 1/4" Durrock or wonder board on top--Set in thinset and nailed or screwed.

You could leave the good and replace only the bad--then add a layer of 1/2" AB ply and your backer--you must decide which is easier and offers the best height for the finished floor.
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Old 07-03-2012, 05:49 PM   #5
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Hardiboard on OSB


Quote:
Originally Posted by RomanDesign

Cut out all the OSB or cut out all of the damaged area?
Take all bad osb out and inspect the joists as well make shore there not looking like the OSB does in the pictures.
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