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Posted by RicodJour on October 4, 2006, 11:54 am
Wayne Whitney wrote:
>
> > I've recently seen a new floor installation method that uses a strip
> > of closed cell foam tape on top of the joists instead of glue. The
> > sheathing is then put down using #8 screws on the same pattern as
> > one would use 10d nails.
>
> Hi Bob, I believe a #8 screw has a root diameter of 0.112" while a 10d
> nail has a diameter of 0.148". So presumably the #8 screw has a lower
> shear strength. If so, does this difference matter in earthquake
> country?
The screw steel is harder and less ductile than that of a nail. You
should never use drywall screws to attach the subfloor - deck screws at
the least. If you're building in earthquake and hurricane territory,
or the screws will be experiencing significant shear, the screws should
be rated like those Bob mentioned.
R
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