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chelsea

05:56AM | 11/09/01
Member Since: 10/12/01
9 lifetime posts
Bvflooring
We have half inch plywood subfloors and are getting set to do a tile job. Our plan is to put an additional half inch ply plus quarter inch hardybacker on top. We have been advised to liquid nail the half inch ply together with nailing it into the joists after which the hardybacker will be screwed in on the marks (approx 8 inchs apart). Is it essential to liquid nail the ply to the subfloor? Should we perhaps screw in the additional half inch ply even though the hardybacker is going to be screwed in. Just seems an awful lot of screws will be going into this.

Jay J

07:35AM | 11/09/01
Member Since: 10/26/00
782 lifetime posts
Hi chelsea,

Until your grout starts working its way loose, you won't appreciate how invaluable it would be to screw the wood down. The stiffer the floor, the more likely you won't have any movement. Movement will crack the grout and loosen the tiles.

My best to ya and hope this helps.

Jay J -Moderator

PS: If you had the job bidded-out, you'll understand why the fee is 'high' ...

PPS: God Bless America!

rpxlpx

04:22AM | 11/12/01
Member Since: 03/13/00
1675 lifetime posts
Something that's been covered in other posts is that nails provide more shear strentgh, while screws hold things tight and unmoving. That's what you want here - no movement at all.
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