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Deflection Question

 
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Old 03-25-2018, 03:21 PM   #1
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Deflection Question


Started a bathroom project this week, when I first looked at the job the room underneath looked to have a faux wood ceiling.
Once we got the bathroom demo complete.
The ceiling from below is basically the floor of the bathroom.
What we are left with is 2x4 t&g cedar over a 4 foot span supported by 2x10 rafters.
The previous bathroom had 3 layers of 1/2 plywood down which we have removed.
I am wondering how many layers advantech I need to install to meet deflection, was also planning on installing ditra heat but no sure if it is the same as ditra XL or regular ditra.
I know there may be something similar to this in the TNCA book, but I have looked all over and cant find my copy.
Has also taken some jiggling around to figure out how to get traps in position but speaking with plumber tomorrow and I think we have a plan.
Thanks for any help
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Old 03-25-2018, 04:10 PM   #2
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Re: Deflection Question


what sizes are available in your market?

if it wasn't tile I think 1 layer of 3/4 would be enough, I would probably lean more to 1 1/8 if available, is it possible to reduce the 4' span?

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Old 03-25-2018, 04:19 PM   #3
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Old 03-25-2018, 06:44 PM   #4
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Re: Deflection Question


The 2x10 floor joist are 4' O.C.?

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Old 03-25-2018, 07:57 PM   #5
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Re: Deflection Question


Yeah the floor joists are 4' OC, but its got 2x4 cedar t&g on top of that. I have a picture some where will see if I can post it
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Old 03-25-2018, 08:06 PM   #6
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Re: Deflection Question


I am pretty sure I can get any thickness advantech although 3/4 is stocked.
Will check tomorrow at the lumber yard
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Old 03-25-2018, 08:22 PM   #7
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Re: Deflection Question


here is a picture of the ceiling from below sorry about the pink writing I sent to plumber to show were the shower is going
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Old 03-25-2018, 08:31 PM   #8
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Re: Deflection Question


1-1/8" Sturdi-Flor.

Tile no stone.

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Old 03-25-2018, 08:37 PM   #9
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Re: Deflection Question


I was hoping to get going on this tomorrow. If I cant get 1 1/8th"
Would it be the same if I doubled up 3/4" screwed and glued. Or not worth taking a chance.
We always tear down to the deck to make sure the install is perfect so if the answer is to wait and order up the 1 1/8th then thats what I will do.
thanks for the info Tom
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Old 03-25-2018, 08:41 PM   #10
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Re: Deflection Question


Glued and screws will do.

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Old 03-25-2018, 09:17 PM   #11
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Re: Deflection Question


I've seen plenty of old, not failing tile installations over similar floors with nothing but cement board over the 2x T&G. I believe the 2X T&G has a pretty decent deflection rating at 4', assuming it's installed tight.

3/4 ply over would probably do a lot to distribute the loads, but 1 1/8 would be better.

1 1/8' Sturd-i-floor is rated for 4' span too on its own, but worth noting the deflection is way more than a typical floor of 3/4 ply at 16" OC.
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Old 03-25-2018, 10:30 PM   #12
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Re: Deflection Question


What Tom said. Deflection is only rated for Porcelain tile, no natural stone.
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Old 03-26-2018, 02:04 AM   #13
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Re: Deflection Question


If that ceiling is the floor above, where's the drainpipe from the existing bathroom?
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Old 03-26-2018, 03:54 PM   #14
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Re: Deflection Question


Managed to get 1 1/8" Advantech at lumber yard a few towns over, so will put that on top of the cedar 2x4's, and should be good to go.

On the other side of the room the floor overhang/soffit to the exterior about a foot and thats were previous shower was as well as toilet.

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