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-   -   Deflect-O-Lator Rating Help (https://www.johnbridge.com/vbulletin/showthread.php?t=22623)

Craig1 04-20-2005 08:50 PM

Deflect-O-Lator Rating Help
I went into the Deflect-O-Lator with my measurements and my inches on center is much larger than the drop-down menu allows. Here are my joist measurements: 5.5" tall; 3.5" wide; 7' long between supports and 48" on center in Douglas Fir. My subfloor information is: 1 1/2" thick T&G floor boards which are 5" wide. The subfloor runs perpendicular to the joists. Can you work this Deflect-O number out for me? If lower than L/720 what would I need to do to bring it up to L/720?

MHI 04-21-2005 05:45 AM

Hi Craig,

48" on center joist spacing is way too much for tile or stone. I think you will need to add some joists.:)

bbcamp 04-21-2005 06:01 AM

1 Attachment(s)
I agree, that subfloor and framing scheme is fine for ceramic tile, but won't work for natural stone. You would have to install doubled 2x6s (or a 4x6) from each post (these will be parallel to the subfloor planks), then 2x6s connecting these new beams so they are on 16" centers. See sketch below:

Craig1 04-22-2005 11:05 PM

Deflect-0-Lator Rating Help
Thank you for your replies. They were very useful. We're going to go with porcelain tile. Would a suitable underlayment for it be 5/8" exterior grade plywood screwed to subfloor then 1/4" cement board screwed and thin-set to plywood then tile, thin-set to cement board? Please advise on thin-set types at both levels. I would like to use Laticrete products. Would like to get your input.

bbcamp 04-23-2005 07:46 AM

5/8" plywood screwed to the planks, then backerboard embedded in UN-modified thinset, then modified thinset for the tiles will work. I am not familiar with the Laticrete line of products, but you can use the cheapest UN-modified thinset for embedding the backerboard, and a mid-priced modified thinset for the tiles. You don't really need the higher priced products for your project.

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