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Old 12-21-2018, 06:15 PM   #31
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Re: Subfloor stiffening / levelling - need advice


Quote:
Originally Posted by misuszatek View Post
Thank you Rusty for reply,

Do you mean, self-leveling over 1/2" subfloor and then 3/4" ply over it?
Plywood first.


On the other side of that double the joist change directions do you have a bump out the side of the house with a cantilevered floor?
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Old 12-21-2018, 06:21 PM   #32
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Re: Subfloor stiffening / levelling - need advice


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Originally Posted by Nealtw View Post
Look at the gap under the double.
There is a small gap. Also, I measured each joist I can access and those double ones are 7 3/16" ... the one causing the bump is 7 6/16" and next closer to left wall is 7 2/16".
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Old 12-21-2018, 06:28 PM   #33
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Re: Subfloor stiffening / levelling - need advice


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Originally Posted by Nealtw View Post
Plywood first.
what about those cavities between both layers of plywood?
is it ok to leave them? Should I even bother with self leveling in case 3/4" ply will come out leveled?

pic below ⬇︎



Quote:
Originally Posted by Nealtw View Post
On the other side of that double the joist change directions do you have a bump out the side of the house with a cantilevered floor?
No
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Old 12-21-2018, 06:45 PM   #34
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Re: Subfloor stiffening / levelling - need advice


Quote:
Originally Posted by misuszatek View Post
There is a small gap. Also, I measured each joist I can access and those double ones are 7 3/16" ... the one causing the bump is 7 6/16" and next closer to left wall is 7 2/16".
So You have found one higher than the rest, there is a fix for that.


Cut the plywood on both sides of that joist and let it go down to level.
remove the plywood on top of that joist. lay a couple 2x4 across the area and screw it down so the two ends of the plywood are held level or flat.


Add blocks to the sides of that joist from below with glue and just a couple tacks .
Back up stairs drive screws down thru the plywood into the blocks to pull them up tight.
Down stairs screw the blocks up tight to the joists. Remove the flat 2x4s above.
Flat floor. fill the space on the joist.
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Old 12-21-2018, 06:51 PM   #35
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Re: Subfloor stiffening / levelling - need advice


This is how they used to do bathrooms to have room for the mortar bed.
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Old 12-21-2018, 08:14 PM   #36
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Re: Subfloor stiffening / levelling - need advice


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Originally Posted by Nealtw View Post
So You have found one higher than the rest, there is a fix for that...
Ok,... so after that fix I can screw 3/4" ply to the existing one and add Ditra, correct?

Or should I go with 5/8" instead of 3/4"?
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Old 12-21-2018, 08:21 PM   #37
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Re: Subfloor stiffening / levelling - need advice


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Originally Posted by misuszatek View Post
Ok,... so after that fix I can screw 3/4" ply to the existing one and add Ditra, correct?

Or should I go with 5/8" instead of 3/4"?
I would go to 3/4.
Does that plan sound like it will work?
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Old 12-21-2018, 10:15 PM   #38
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Re: Subfloor stiffening / levelling - need advice


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Originally Posted by Nealtw View Post
I would go to 3/4.
Does that plan sound like it will work?
It might. I checked the level at the door entrance and its way better than in the center of the bathroom so it should be a lot of cutting.

I will post updates / pictures once I'm none.

Thanks again!
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Old 12-25-2018, 04:00 PM   #39
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Re: Subfloor stiffening / levelling - need advice


I got all the materials and planned to start cutting the floor but I think I found another problem I missed before. while using self-leveling laser to measure the floor level I see another spot outside of those joists we talked about ... its on the right side of bath entrance and its raised 3/8" over the level.



Now I will remove bump but what to do with 3/8" outside fixed area?
It cross my mind to map the 3/8" area on 3/4 plywood and shave it to accommodate the 3/8" difference but I'm not sure if this the right way to do it.

What do you think?
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Subfloor stiffening / levelling - need advice-img_3563.jpg   Subfloor stiffening / levelling - need advice-img_3564.jpg   Subfloor stiffening / levelling - need advice-img_3565.jpg   Subfloor stiffening / levelling - need advice-img_3566.jpg   Subfloor stiffening / levelling - need advice-img_3567.jpg  

Subfloor stiffening / levelling - need advice-img_3568.jpg  

Last edited by misuszatek; 12-25-2018 at 04:03 PM.
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Old 12-25-2018, 04:04 PM   #40
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Re: Subfloor stiffening / levelling - need advice


I have made a map of the floor so explain level differences.
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Old 12-25-2018, 10:05 PM   #41
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Re: Subfloor stiffening / levelling - need advice


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Originally Posted by misuszatek View Post
I have made a map of the floor so explain level differences.
Can you have some one stand in this area while you watch this to see if it is worth trying to pull down.
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Old 12-26-2018, 11:42 AM   #42
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Re: Subfloor stiffening / levelling - need advice


First I would use Ditra for your tile underlayment. Not only is it better than cement board in terms of performance, it's also easier to install and it will not add much to the height. If you used another layer of 1/2" plywood and 1/2" cement board you've just added 1" to your floor height, not counting thinset and tile, so you're going to be close to 1 1/2" higher at the door transition, possibly not what you want.


Put down 1/2" plywood or 5/8" or 3/4" as appropriate, then fill in any low spots with self leveling compound (as previously mentioned, you don't need level, you just need flat, but as soon as you start using self leveling compound, you can't help but get both.) Then use standard (small size) Ditra and tile on top. You will be fine assuming your joists are solid.
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Old 12-26-2018, 11:47 AM   #43
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Re: Subfloor stiffening / levelling - need advice


You might be able to pull that bump down, assuming the 2 joists are not sistered together (i.e. most likely nailed, if so). If they are not, then you can screw a board across the bottom of the 2 joists on either side of it. Then drive screws up through the board into the high middle joist. This will pull it down perfectly even with the other 2. If the subflooring is nailed into the sister joist, then pulling the high joist down will be difficult. If the subflooring is nailed into the high joist, it should be easy. Of course you must use screws that have the proper size shank (at least 1 1/2") so that the threads will not catch on the piece of wood you're screwing through. If this doesn't make sense, ask more.

Last edited by jeffnc; 12-26-2018 at 11:49 AM.
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Old 12-26-2018, 12:32 PM   #44
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Re: Subfloor stiffening / levelling - need advice


Quote:
Originally Posted by Nealtw View Post
Can you have some one stand in this area while you watch this to see if it is worth trying to pull down.
I think it will be hard to pull it down as framing around chimney was built on top of the raised/ uneven subfloor. That's why I consider shaving bottom of 3/4" ply that goes in that area and maybe correct with self leveling on top.

Quote:
Originally Posted by jeffnc View Post
Put down 1/2" plywood or 5/8" or 3/4" as appropriate, then fill in any low spots with self leveling compound (as previously mentioned, you don't need level, you just need flat, but as soon as you start using self leveling compound, you can't help but get both.) Then use standard (small size) Ditra and tile on top. You will be fine assuming your joists are solid.
I already shaved top of the joist to minimize this bump. Planning to put 1/2" back and 3/4 over the top.

Question:
If I use self-leveling compound I can still use thinset like flexbond under Ditra, correct? Also any self-leveling compound you recommend?

Thanks guys
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Old 12-26-2018, 12:53 PM   #45
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Re: Subfloor stiffening / levelling - need advice


Quote:
Originally Posted by misuszatek View Post
I think it will be hard to pull it down as framing around chimney was built on top of the raised/ uneven subfloor. That's why I consider shaving bottom of 3/4" ply that goes in that area and maybe correct with self leveling on top.





Thanks guys
If you don't think it will pull down then I would shim under it so to make sure it never moves.
I would sand the surface of the plywood that is down now and try to smooth out that 3/8 to match the 1/4" and then put in the plywood.


I don't have a favorite brand for a leveler, others might. You only have to level under the edge of the tub, the rest under there won't matter
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