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Cracking grout

Posted by JT on February 17th, 1998 05:51 PM
In reply to Cracked grout by Billy B on February 16th, 1998 10:27 PM [Go to top of thread]

Billy, first off, the tile guy is right. According
to the TCA Handbook, two layers of 5/8" plywood is
recommended, and laying tile on this kind of floor
even then comes with a cautionary note (i.e. it's
not the best way to go). As far as the trusses are
concerned, the 16" oc is good, sometimes they are
spaced wider and that is a problem for tile. Again
accordingto the TCA Handbook and ANSI 108, a floor
that is to receive tile must exhibit a maximum
deflection of no more than L/360 (i.e. 1/360 of th
span, in your case 30x12/360=1"). The truss
manufacturer can best answer whether his product
meets this spec. under normal loading (usually 40
If it were me, I would not accept any solution that
adversely affected the utility of any part of the
house. Good luck.

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