Leveling Wood Subfloors - Floating Bamboo

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themule
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Leveling Wood Subfloors - Floating Bamboo

Post by themule » Fri Mar 22, 2019 4:13 pm

Hi - I'm ready to start floating bamboo flooring on the second story of my home. After removing the carpet, I've noticed a few dips in various high traffic areas. I have a few areas about 2'x2' and one area about 4'x6' to fix before starting. Depending on the area, the gaps range about 1/8'' to 3/4''. One thing to note, the subfloors are 7/8'' and the manufacturer calls for 1-1/8'' for joist 24'' on center, which is what I have.

I think it's overkill and out of my expertise to self-level the entire floor, however it's probably what needs to be done from a purist perspective.

Plan A:
To flatten the lager area, I was thinking to taper using this felt underlayment -
And for the smaller areas, use a traditional patching compound

Plan B:
Add 1/4'' subfloor to existing. Not sure if this would really fix the problem except for getting me inline with the manufacturer spec

Before heading down this road, just wondering your thoughts.

Jmaclicious
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Jmaclicious » Fri Mar 22, 2019 5:13 pm

I was self levelling my basement floor, I originally used Mapei Self leveller plus... however I picked up some primer and 2 bags of Sika Level 125 to see how that was in comparison... it was WAYYYY better, smooth finish right down to a feather edge. The primer they use for cement/wood is the Primer level-03. I tried using sand/topping mix it was a pain in the ass.. mapei self leveller doesnt feather down as nice as this sika stuff.

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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Fri Mar 22, 2019 9:54 pm

For a floating floor I would use under pad or felt in the 1/8” spots if anything at all.
The 3/4” dips are pretty extream are there other issues in those areas ? Broken joists, weak plywood? That’s pretty extreme dip
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Sat Mar 23, 2019 6:19 pm

Ok so it's been a while since I was up there so I went and measured again today. Most spots are 1/8'' to 3/8'' over a 2' to 3' span. There are a few spots at 1/4'' closer to wall/corner. The major spot is small bulge about 1'x1' and 2' away from wall. At the wall it's 1'' !!! Sand it down maybe?

**I'm using a 6' straight edge btw

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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Sun Mar 24, 2019 8:41 am

You can work with those small spots. Sometimes just doubling up the under pad in a low spot will be all you need. That bulge is kinda a strange thing. Is this swelled from water or something ? At an inch you would be pretty much sanding through it? You may need to remove that area and replace it ?
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Mon Mar 25, 2019 7:31 pm

ok I took some pictures. You can see the seam separating just a bit. It really is a crown about 2.5' from the wall, on the joist. If I move that straight edge 6'' to the left or right, the gap drastically reduces to almost nothing. The other two pics are measurements of the gap at the wall and about 2' from it. I tested for moisture, nothing out of bound.
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2 foot from wall
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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Mon Mar 25, 2019 8:59 pm

Is there something below that joist pushing it up?
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Tue Mar 26, 2019 6:13 pm

Not from what I can tell. No interior wall downstairs lines up or anything. Should I open it up?

Also, I know I have this type of joist:
Pryda-Longreach-joist-truss-300x202.jpg
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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Tue Mar 26, 2019 10:21 pm

Seems like an odd thing in a newer home? It’s so hard to really assess something like this form pictures. Is the ceiling below bulged like this as well?
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Thu Mar 28, 2019 7:18 pm

The home was built in 2004, and I don't notice anything with the ceiling below. BUT during this, some things are starting to make sense.

1st On the small entryway shown here(I'm standing on the crown) you can always feel it leaning toward the right. It is 100% noticeable, you can almost see it in the shadow in the pic. Above, you can see the texture fix, I had someone patch a crack in the drywall, running from the door to ceiling. The floor seam on the right is the one in question.
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2nd I just measured upstairs and downstairs, and it lines up perfectly in my kitchen, where part of the stairwell is a wall. I've always noticed a drywall patch there before. You can see it under the pig picture, and there is a patch on the ceiling too. I "think" they used to have the water heater under the stairs and then built a util room outside the house later. In the other pic, you can see the odd water lines and the old junction box.
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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Fri Mar 29, 2019 7:52 am

I just cant say for sure what's going on. Could have been like this from the beginning for some reason or there could be something causing it but i just can't say for sure, sorry.
What is below all of this right to the basement ? Is there a beam or post down there in this area?
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Fri Mar 29, 2019 8:19 am

No basement. That is the crawl space under the stairs. Is it worth it to endoscope to possibly see what's going on?

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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Fri Mar 29, 2019 10:44 am

So in crawl space are there any beams or posts in that area where the hump is?
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Fri Mar 29, 2019 11:07 am

No just the joist. The wall with the pig on it is the same wall where I measured the gap upstairs. It's basically the stair column. So downstairs, in the kitchen, about 2' from the wall is where it would line up.

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Shannon
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by Shannon » Fri Mar 29, 2019 7:53 pm

Sorry I’m a little unsure what really is causing the issue? Maybe its been this way right from new?
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themule
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Re: Leveling Wood Subfloors - Floating Bamboo

Post by themule » Fri Mar 29, 2019 8:18 pm

Maybe. I’ve only been here for 5 years. I’ll inspect next week and post my findings.

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