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Old 02-10-2012, 10:55 AM   #1
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Screwing down (specifically) Fiberock


So, I'm installing 300 sq. ft. of Fiberock per the manufacturer's instructions (thus far), and according to USG, the screws don't need to be flush to the surface of the board:

Quote:
Drive nails and screws so that bottoms of heads are flush with panel surface to ensure firm panel contact with subfloor. Do not overdrive fasteners.
My question/concern is all other backer board manufacturers and DIY posts seem to indicate that the tops of the screws need to be flush with the panel surface. I'm going to be laying porcelain tile over the Fiberock using thinset.

Who do I believe—manufacturer, or everyone else? I'm thinking the thinset will gloss over the 1/32" to 1/16" of screw head sticking up above the backer board, but I'd like a second opinion.

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Old 02-10-2012, 11:17 AM   #2
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Screwing down (specifically) Fiberock


I went thru the lit and couldnt find where it says that.

Believe everyone else and make the tops flush with the board.

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Old 02-10-2012, 12:05 PM   #3
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Screwing down (specifically) Fiberock


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Originally Posted by 12penny View Post
I went thru the lit and couldnt find where it says that.
Page seven of the brochure:

Quote:
Fastening

Fasten to subfloor with 1-1/4" Durock tile backer screws for wood framing (or equivalent) or 1-1/2" hot-dipped galvanized ring shank roofing nails spaced 8" o.c. in both directions with perimeter fasteners at least 3/8" and less than 5/8" from ends and edges. Drive nails and screws so that bottoms of heads are flush with panel surface to ensure firm panel contact with subfloor. Do not overdrive fasteners.
I'm not questioning your advise—just explaining where I found it. Any thoughts?
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Old 02-10-2012, 12:26 PM   #4
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Screwing down (specifically) Fiberock


Or..... why not use the roofing nails? Much faster, cheaper, work great cuz you're likely to use more, no bumps. They do not have to be the ring shank type, which I'm not sure where to find. Don't skip the thin set under the panels and tape the seams etc.

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