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-   -   Sorry, another newbie subfloor question (https://www.johnbridge.com/vbulletin/showthread.php?t=27676)

cal_dreamer 09-27-2005 06:15 PM

Sorry, another newbie subfloor question
After living on a slab all my life, the cabin we are building has a subfloor and I'm a little concerned about the deflection stuff.

Room in question is 5 x 11, with an alcove tub at the far end. The joists are marked "Silent Floor TJI 210" and are 16" oc running the length of the room. They are supported by a beam partway through, with the longest unsupported span being 7' 6". Subfloor is 23/32" plywood perpendicular to the joists.

Do you think I would be OK with 1/2" CBU on the floor? Or do you recommend additional Ply?

This is a cabin/vacation home and I'll be tiling it myself - after I get the book (of course).

Any advice is appreciated. :bow:

Thanks, Holly

Mad dog 09-27-2005 06:20 PM

You would be in good shape with that proposed subfloor. Have at it. I do recommend Kerabond/keralastic as an excellent thinset.

Good luck,


muskymike 09-27-2005 06:39 PM

Hi Holly, welcome. What Dog said. You can use ditra as an underlayment if you wanted to. Either one, cbu or ditra. :)

cx 09-27-2005 07:06 PM

Welcome, Holly. :)

I think the smallest joist in that series is 9 1/2 inches tall, so you're in fine shape for joist structure.

Just keep in mind that you're right at or near the minimum subflooring prescribed for the various CBUs and isolation membranes. More subflooring is always better.

There is no advantage, by the way, to using the thicker CBU. If your subfloor qualifies, you can use the 1/4 inch CBUs as well.

My opinion; worth price charged.

floorman67 09-27-2005 07:09 PM

would have to agree there.

there is no such thing as a subfloor that is TO sturdy.

when we bought this home and remodeled, the first thing we did after the demo is double up the single layer of subfloor. Solid as a rock now 12 years later not one problem.

welcome aboard and good luck.

cal_dreamer 09-28-2005 09:22 AM

Thank you all so much. I'll probably go with 1/4" or 1/2" CBU, depending on the height the adjacent hallway is going to be. I'd rather not step up into the bathroom if I can help it.

I lurk around here quite a bit and have learned so much. I think I might get enough nerve to try the tub surround as well. Won't happen 'till early next year, so I have plenty of time to do my homework.

Muskymike, the ditra looks like a good product, but I'm kind of limited to shopping at the box stores. I'll keep my eyes open as I do my research, though.

Now I'm off to meet the painter and tape more tyvek seams.

bbcamp 09-28-2005 09:53 AM

Holly, HD can order Ditra for you if they don't stock it. You can also by it online from Tile Experts.com. There's a link in out online store.

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