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Old 11-18-2009, 10:38 AM   #1
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Subfloor Construction??


Hey Everyone. I am a new home owner and have begun to tear out my bathroom on the second floor. When I got down to joists there are 1 x 8s that lay on there. I have replaced the ones that needed to be and am ready to build the rest of the floor. I have read many articles and posts and have come up with about 30 different ways to complete the subfloor in preparation for some tile. The bathroom is about 8 x 8 so it isn't huge.

Here is my thought - I will lay a 3/4 inch BC Sanded Pine plywood on top of the 1 x 8 s. I will screw these into the joists (I have read in favor of screwing into and not into the joists). Then I plan to put about a 1/4 inch of self leveling crete on top of the plywood to level the floor out in that there is a slight variation. Next I will put a coat of mortar between the self leveling crete to act as a glue for the HardiBacker board. Once that is on there I plan to use HardiBacker, 1/4 inch thick, to accept the tile.

Is this over kill to have that many layers??? I have the room to do this if needed but I want to make sure that all of those steps are necessary. Appreciate all the help.

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Old 11-18-2009, 11:54 AM   #2
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Subfloor Construction??


not enough information and not enough layers. First use 3/4" T&G flooring plywood, not the BC sanded pine. You also need 1 1/4" of plywood not just 3/4" So first the 3/4" T&G then 1/2" Exterior grade plywood. leave 1/4" joints at all edges of the plywood both levels. Stagger the joints on the top layer having the joints meet NOT at the joists. Use thinset and screws to fasten the CBU.

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Old 11-18-2009, 11:59 AM   #3
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Subfloor Construction??


He already has 3/4" subfloor of 1x8's
Then he is adding 3/4" plywood over that
That seems like enough.....am I missing something?
....that's what I have in my bathroom....plus mud leveller & hardi board w/tile
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Old 11-18-2009, 12:20 PM   #4
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Subfloor Construction??


Quote:
Originally Posted by Scuba_Dave View Post
He already has 3/4" subfloor of 1x8's
Then he is adding 3/4" plywood over that
That seems like enough.....am I missing something?
....that's what I have in my bathroom....plus mud leveller & hardi board w/tile

I read this...
Quote:
I will lay a 3/4 inch BC Sanded Pine plywood on top of the 1 x 8 s.
Maybe I missed something. but BC ply is not the way to go
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Old 11-18-2009, 07:37 PM   #5
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Subfloor Construction??


The 1x8s seems to me to be the subfloor, plank flooring, not a joists size, so, in that case, yes, 1/2" or 3/4" ply over that will be fine.

Ext grade AC or BC will be fine, NO CDX.

Now, the bigger issue, you CAN NOT install cemenboard over the SLC.

You can either install the CBU over the plywood with thinset and screw it down, then level the floor, or, use SLC as per instructions over the plywood and then tile directly over the SLC or install a tile membrane over the SLC.
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Old 11-18-2009, 10:56 PM   #6
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Subfloor Construction??


Ya 1x8 planks. No way could you use 1x8's for floor joists lol
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Old 11-19-2009, 08:59 AM   #7
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Wow. Didn't think there would be that many responses so quickly. Thanks for the help. Basically what I am hearing is that everyone has their own way of doing things. The one that was helpful is to use the self leveler on top of the cement board.

I am still a little confused though. Are the 1x8s that are on my 2x10 joists sufficient to hold the 3/4 ply and cement board? Can we agree on that piece??
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Old 11-19-2009, 11:34 AM   #8
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Subfloor Construction??


yes this will work

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