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Unread 08-18-2020, 12:29 PM   #14
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,381
Yes, the Deflecto utility differs somewhat from load tables in that it is more conservative since most people doing work on this site are remodeling, and the materials may not be perfect.

The required length info, only you can tell. Typical supports can include load bearing partition wall(s), beams, or rim joists. It is the distance under your floor between supports that is critical, along with the spacing and their depth.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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