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Old 02-17-2005, 12:02 PM   #3
RobC
Registered User
 
Join Date: Dec 2004
Location: Ottawa, ON
Posts: 34
I am guessing that the deflecto assumes a total floor thickness of 1 1/8".

What if your subfloor and underlay are actually more than this? For example, I have engineered 2x10 (2.5" flange, 9.5"h) I-joists @16" o.c. (15' span) with 5/8 TG subfloor and 3/4 spruce plywood. My plans did not call for any blocking, but I put some in anyway.

The deflecto gives me L/530 but I am wondering if the extras give me enough to support natural stone. Anyone know?

Thanks!
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