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drywall screws ok for subflooring Jack 10-12-2006
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Posted by Jack on October 12, 2006, 2:30 pm


Am securing an OSB to a subflooring, will put cement board then tile on
top. Am I ok using drywall screws to secure OSB to plywood (will also
use construction adhesive)


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Posted by professorpaul on October 12, 2006, 2:35 pm



Coated ring nails are cheaper, and are intended for this purpose. You
don't want something working loose.


Posted by Al Bundy on October 12, 2006, 2:40 pm


@h48g2000cwc.googlegroups.com:

> Am securing an OSB to a subflooring, will put cement board then tile on
> top. Am I ok using drywall screws to secure OSB to plywood (will also
> use construction adhesive)
>
>

My pure GUESS is no. They are hardened and can snap with movement. That
guess is based on a pro carpenter friend telling me to never use them to
"sister" things that are suppose to flex like trusses.


Posted by Doug Miller on October 12, 2006, 2:45 pm


>Am securing an OSB to a subflooring, will put cement board then tile on
>top. Am I ok using drywall screws to secure OSB to plywood (will also
>use construction adhesive)
>
No, not unless you're going to drill a pilot hole through the OSB for each
screw. When screwing two pieces of wood together, it's important that the
screw threads *not* bite into the first piece: that piece needs to be free to
move along the screw so that the head can draw it tight against the second
piece. That's why wood screws have a smooth shank. Otherwise, if the threads
are biting into *both* pieces at once, the screw can actually hold them a
short distance apart.

Use ring-shank nails.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Posted by Al Bundy on October 12, 2006, 4:08 pm


spambait@milmac.com (Doug Miller) wrote in

>>Am securing an OSB to a subflooring, will put cement board then tile
>>on top. Am I ok using drywall screws to secure OSB to plywood (will
>>also use construction adhesive)
>>
> No, not unless you're going to drill a pilot hole through the OSB for
> each screw. When screwing two pieces of wood together, it's important
> that the screw threads *not* bite into the first piece: that piece
> needs to be free to move along the screw so that the head can draw it
> tight against the second piece. That's why wood screws have a smooth
> shank. Otherwise, if the threads are biting into *both* pieces at
> once, the screw can actually hold them a short distance apart.
>
> Use ring-shank nails.
>

Yea, that too! :-)

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