Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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How to secure a toilet flange when the opening is cut too wide?

The cutout in the subfloor for the toilet flange is too wide, leaving nowhere for me to secure it. The plumber had set some shims underneath the flange but I'm not sure I'd trust those shims to hold ...
Niko's user avatar
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Should I apply construction adhesive between layers of subfloor with a caulking gun or trowel?

My second floor has an existing subfloor constructed with 5/8" plywood. I am installing a second layer of 3/8" plywood to raise the level of the subfloor prior to installing bamboo flooring. ...
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Adding a layer of plywood on top of subfloor for LVP install. Will the new layer help level the floor?

I am renovating my bathroom and originally planned to install cement board and porcelain tile for the flooring. I have 2x8 wood joists, 16" OC, with a span of 14'. I backtracked on the tile when ...
Niko's user avatar
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Is there a drawback to underlayment between multiple layers of subfloor?

My upstairs sub flooring is 5/8" plywood, which is screwed to the joists. I want to add an additional 3/8" layer of plywood, followed by floating 1/2" bamboo flooring. I plan on using a ...
Troy Blackburn's user avatar
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How should I insulate and block moisture in a floor over a crawl space?

Summary Planning to replace carpet in walk in closet. Pulled up padding and found 5/8" partcleboard as only subfloor. Ripped that out and have some 23/32 gp dryguard osb going in. Under the ...
meguy's user avatar
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How to spot-fill low spots in concrete self leveler for shower pan?

I am attempting a shower renovation. I poured self leveler in the shower area to smooth out the surface for installation of a Schluter foam pan. I ended up with some low areas, and I'm looking for ...
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Newly installed plywood subfloor seems to be splitting

I patched a ~4x4’ section of subfloor in my bathroom where there was water damage. Glued and screwed the new plywood down to the joists (16” on center). When I step on the patched subfloor, I can hear ...
Niko's user avatar
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How do I determine why my town house floors are uneven all over? [closed]

My townhome, built 1988, has floors that are not level throughout the home. In the bedroom if a dresser is against the wall on two opposite walls they have an extreme forward tilt; but, on the other ...
Bri's user avatar
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Pulled Toilet . Water Damage Assessment Request

I bought a 30 year old house and noticed that the toilet was rocking. Mounting screws pulled right out (see pic). I pulled the toilet. The flange was completely rusted through and the wax was ...
DrBears's user avatar
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Condo Hardwood Install Advice

I am looking into installing new hardwood in my condo and have seen conflicting info on a few things that I could use clarification on. The existing hardwood sits on some some 3/4" sleepers which ...
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Adding support for subfloor

Im replacing the subfloor in a 2nd floor bathroom of a 1920s house. It was level and in decent shape, but covered with adhesive and backer board for tile so replacing it seemed the easier option. ...
BakerAugust's user avatar
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Transition from wood to concrete floor in middle of room

I'm converting my attached garage to a living space. The floor is graded and so will need to be raised. The deeper portion can be raised via building a wood subfloor, but the portion that's shallow ...
The Shoe Shiner's user avatar
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Subfloor or underlayment?

So, I have been doing a lot of research and could not find a solid answer. There seems to be different opinions. For my half-bathroom renovation, I am starting fresh. For flooring, for the first layer ...
Zeetwo's user avatar
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Do I Need to Replace the Insulation Under Bedroom Floorboards?

We recently purchased and moved into a house built in 1943. It is a Cape Cod with a former-attic second floor that seems to have been added on in the 70s The wood paneled bedroom up there had very ...
Jennifer's user avatar
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How to handle expansion joints in garage floor during conversion

I'm converting my attached garage to a living space. The floor is graded and so will need to be raised (likely via putting an osb subfloor on top of it). Current garage slab has contraction joints cut ...
The Shoe Shiner's user avatar
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Identifying and Removing a Subfloor in a 12-Year-Old UK House

I've recently purchased a 12-year-old house in England and am addressing a creaky spot on the first floor, which I suspect is related to a joist issue. Upon removing the carpet and underlay, I ...
BenWokin's user avatar
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How smooth does the subfloor need to be before installing cement board for tiling? [closed]

I have removed the previous tile and cement board from the bathroom. I knocked down all the major ridges and bumps from leftover thinset on the subfloor. What remains is a very thin layer on thinset ...
Niko's user avatar
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Would you use self leveler on a 5/8 inch dip across 10 feet?

I have a room where I want to lay down LVP but the middle of the room dips down to 5/8 inch across 10 feet. I'm planning on using self leveler here. Is this an acceptable fix?
Andy Cheng's user avatar
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How do I level the edge of concrete foundation?

I replaced some engineered hardwood flooring recently and we noticed that it was slanted because towards the edge of the house, the concrete subfloor (no underlayment) is slanted there. What can I do ...
Steven's user avatar
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Can I use subfloor to align a house-length starter row of hardwood flooring to the house, rather than to a single room?

Carpet has been removed and subfloor exposed and cleaned. The floor has been leveled to <3/16" out of flat over 6', primed to cover some pee spots, and is ready for the underlayment. The new ...
J.D. Mallen's user avatar
2 votes
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How to install flooring over a sleeper subfloor?

1970s subfloor basement construction I'm currently redoing my basement and after removing the carpet I come across particle board nailed on top of 1.5 x 2.5 wood batons that are screwed into the ...
Runnye's user avatar
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PVC Sleepers - Finished Basement Subfloor

I came over here from reddit because I really want some feedback on this idea I stole from another redditor (they haven't responded to my inquiries, but I really like the idea). I'm currently planning ...
Geologist1986's user avatar
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Fix uneven and sloped plywood subfloor

We recently moved into an old townhouse and are renovating the entire second floor. The 10-year-old laminate flooring is squeaky and uneven, so we removed all of them and put down SPC vinyl flooring. ...
Zhuoyun Wei's user avatar
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Small part of subfloor on exterior wall rotten

I am ripping up carpet in a room to replace with vinyl planking, and found this 1 foot by about 2-4 inches of subfloor near exterior wall rotted leaving a hole there basically after i took out as much ...
Philip Whitmer's user avatar
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Can I replace 3/4 particle board underlayment with 1/2 OSB?

I ripped up carpet to replace with LVP in my 1976 bi-level home to find 3/4 particle board on top of the subfloor. I then found out that the particle board should be removed. I spoke with a friend who ...
Andy Cheng's user avatar
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Is this thick mortar? Can i patch it and tile over it?

This was what was under the tile in my bathroom. Probably from the 50s. I think it is thick mortar? It is crumbly in places. I don't want to demo the entire thing, I'd have to hire someone to do it. ...
Sarah's user avatar
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New Construction Basement Subfloor/Finishing System

Moved into a new construction home at the end of 2022 with an unfinished basement in Iowa. Starting to research DIY options and am starting with the subfloor and cant come to a conclusion on "...
Dave G's user avatar
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Do I need to remove my shower to patch the subfloor?

The flooring near the corner of my shower was soft and rotted out. I thought I could just cut it out and replace that section of subfloor but after pulling some out, it appears the subfloor runs 3 ...
Jason's user avatar
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My subfloor has been built with untreated 1x2s and plywood. Am I in trouble? [closed]

Last year a contractor installed about 800 square feet of sub flooring to even out the very uneven concrete floor. At the time I didn’t think of it, but the fellow used standard 1x2s and plywood. I’m ...
Litmus99's user avatar
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Level subfloor before installing 2nd layer

I have 1/2 plywood subfloors in my house and I'm preparing to put a second layer of 5/8 OSB subfloor before installing hardwood flooring. In one of the rooms, there are two big areas, about 15' by 8' ...
Mirza Dobric's user avatar
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1 answer
158 views

Securing 3/4" T&G OSB over old plank subfloor

I ripped out my old hardwood and left the old 3/4" diagonal subfloor down. The floor is mostly level. As for flatness, 3 spots need to be taken care of - each spot is about 3/16 to 1/4" deep....
MPols's user avatar
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1 vote
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Upstairs wall studs sitting on top of subflooring that needs to be removed

I am currently renovating the entire second floor of my 1920's home and have run into an issue. The subflooring is currently unleveled and had intentions of pulling up the subflooring, adding a sister ...
Evan's user avatar
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14 votes
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Will adding another layer of plywood improve shed floor bouncing?

I have shed floor that appears to be a sheet of 3/4 inch pressure treated plywood nailed to the joists. While the floor is "sturdy" in that it's holding up fine and shows no sign of rot, it ...
SBT23434's user avatar
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How to prepare 1/2" subfloor for hardwood flooring?

My house had carpets over 5/8 particle board that was sitting on top of 1/2 plywood subfloors. I've removed the particle board and was thinking of installing 5/8 OSB before putting down 3/4 hardwood ...
Mirza Dobric's user avatar
1 vote
1 answer
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how to re-level and support small section of floor

In upstairs bathroom, the caulk between tub and tile was leaking, which lead to water damage in the subfloor and then a section of the tile floor to sag (see picture). There is an access hole directly ...
SeriouslyStan's user avatar
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Is my contractor right about my noisy bathroom tiles? [duplicate]

I posted about this yesterday too under a different username but can’t figure out how to just update it and so I’m doing a new post after gathering some more info. Apologies if that’s annoying. I ...
user176121's user avatar
1 vote
3 answers
606 views

Are tile popping sounds & grout cracks signs of subfloor problems?

I had a new en-suite bathroom installed in my oversized bedroom a little less than a year ago. Today I noticed when walking on a certain tile i hear a little sort of pop sound. On closer inspection it ...
Tyming827's user avatar
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Is our subfloor dry enough to lay hardwood flooring on?

we live in a coastal town in the NE and we are getting ready to lay hardwood floors. Some rooms, the lauan was not in good shape due to pulling up prior floor, so we pulled that up, but other rooms, ...
Carlo's user avatar
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8 votes
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What type of screw is this in my subfloor?

The builders of my 15-yr-old home used this screw to affix my subfloor to the metal joists. I'm putting in new floors and tightening some of the plywood that has loosened over the years. I'm also ...
chuquy's user avatar
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Help needed raising floor in bathroom

Help needed raising floor in bathroom I am renovating my bathroom after a flood (hurricane). I paid a guy to lay my wood floor in the rest of the house. Unfortunately, this raised my floors ...
ETP's user avatar
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1/2" OSB underlayment + Durock VS 3/4" + Durock

I am planning my subfloor from the I-Joists up for a new build in my kitchen and living room. My thought, to minimize the transition between rooms was to lay 3/4" OSB for the living areas, and I ...
DJ Nick's user avatar
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Do I need to place anything under the rubber mats to protect the tile from discoloration?

I'm setting up a small home gym and wanted to place some rubber mats (rolled or interlocking) on the tile. Do I need to place anything under the mats to protect the tile and grout from discoloration? ...
tmetal's user avatar
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1 vote
1 answer
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Do you need a subfloor over insulated concrete?

I'm having a house built, and I was discussing the floor in the basement with the builder. I thought I was going to use LVP over a subfloor, but the builder says they no longer put subfloors over ...
Paul Norman's user avatar
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2 answers
90 views

How could I fill these gaps if I plan on tiling over this?

There’s wooden subfloor in some areas and 3-4 in thick concrete with penny tile. I’m at a loss as these gaps are quite large and I don’t have much experience yet. We plan on pouring self leveler over ...
David's user avatar
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-1 votes
1 answer
211 views

Basement subfloor (dricore) with existing exterior framing & insulation

Basement subfloor (Dricore) with existing exterior framing & insulation I have a 2016-built house in Ottawa, Ontario with a basement that is largely unfinished (only the landing area was finished ...
Clay's user avatar
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0 votes
1 answer
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Do I need to remove this residue from my floor and if so, how?

We’re in the process of laying down vinyl planks and want to tackle the kitchen next. We recently removed glued down hardwood and are left with this. We’ve tried sanding the residue down and it hasn’t ...
Jonathon Griggs's user avatar
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1 answer
294 views

Can I put plywood underlayment under Ditra/tile?

I'm taking up hardwood floor in a bathroom and will be replacing with tile. The hardwood was put in over wood chipboard(?) subfloor with 1/8" plywood underlayment. In order not to have a huge ...
TheGremlyn's user avatar
1 vote
1 answer
132 views

Is 23/32 plywood too thick, heavy to be used as underlayment over 3/4 plywood subfloor?

I am finishing a project started by someone else so I don't know the logic behind material selection. It's a second floor Accessory Dwelling Unit stripped down to the 3/4 plywood subfloor except for ...
Yvonne Ayala's user avatar
0 votes
3 answers
145 views

Can I plane down the underside of 3/4" subfloor to match my existing 5/8"?

Current area, 10' x 12' 3/4" subfloor meeting the existing subfloor, 4mm too tall I've had to replace the subfloor in my living room, but my existing subfloor is 5/8" plywood and I can't ...
Jane Panda's user avatar
0 votes
1 answer
108 views

Do I need to remove/replace hot mop liner on shower floor?

After the demolition of our shower, I noticed our shower floor was water proofed with a hot mop method. This is all new to me (never even heard of hot mopping), so I was wondering if we need to ...
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