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Unread 07-27-2021, 09:29 AM   #7
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Join Date: Jul 2021
Posts: 7
The deflection calc gave me these results:

"For joists that are SYP or Douglas Fir, in good condition, 9.25 inches tall, 1.5 inches wide, 16 inches on center, and 13.5 feet long between supports, the deflection calculated is 0.389 inches.

This translates to a deflection of L / 416.

Since the maximum deflection for tile is L / 360, and for natural stone is L / 720, your floor is rated for Ceramic tile, Congratulations!"

The longest unsupported span is approximately 13.5 feet, but some of the joists are shorter as they come up against the framing for the stairs. This is about half the width of the hallway.

There is some dried adhesive under the floor that may be mastic.

I found some stamping, but I'm not sure if its a grade stamp.

I'm located in eastern massachusetts.
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