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Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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When replacing a floor, how do I ensure it doesn't creak?

I have hardwood from the 50s on most of the main level of my house. It hasn't been well taken care of (it's had carpet stapled into it at more than one point and is generally pretty badly worn and ...
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Bathroom floor repair estimate: is it a fair, going rate? Or am I getting set up to be overcharged? [closed]

Bathroom in a manufactured home (located in more expensive area of western PNW) - subfloor under the toilet area needs replaced (soft and sagging due to previous water leaks). We want to change from ...
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subfloor preparation for top nail 5/16th red oak flooring

This is a specific question about 5/16" top-down red oak flooring. The manufacturer is likely Lebanon Oak Flooring, and this is a common material in the San Francisco Bay Area. It is not tongue &...
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How do I properly buildup floor height under tile?

So I’ve begun my small tile project. I have spread thinset over the wood subfloor and set 1/4” cement board into that. Screwed it every 6”-8” into the wood beneath it with my seam taped and opposite ...
Andy's user avatar
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What is the difference between Ardex K22 F and Liquid Backboard?

I noticed that Ardex has a few different self-levelers. For example, K22 F and Liquid Backerboard. They both seem to serve the same purpose - self-leveling below flooring without the need for metal ...
Ryan's user avatar
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Rotted Subfloor / Door Flashing Advice

We recently had our old deck torn down and a new one built, as the old one was not attached to the house correctly and did not have flashing, leading to water issues. During that work, it was ...
Nick Romano's user avatar
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Will a 2x8 shed floor with OSB support a small car?

I have a 16x20 shed/storage building. I want to store a very small car (10ft long, 4.5ft wide, 1200lbs) on one side of the shed. The shed sits on three 6x6 pressure treated 20 foot beams which each ...
Robert's user avatar
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Bathroom remodel - pulling subfloor

I need to pull the subfloor in an upstairs bathroom to re-arrange the drain location. I imagine the plumber is going to cut a section out (rather than the full sheet). The thing that has me worried ...
Joel's user avatar
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Basement subfloor - DMX + XPS (DuroSpan), no OSB?

Looking to put down LVP. Home built in 1980, located in Quebec, has a sump pump. Having watched RenoVision subfloor video, and learned of the DIY DriCore+ of DuroSpan + OSB, but this doesn't have a ...
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Dip in floor when installing new hardwood

I'm installing new hardwood in my kitchen (see image). On the right side of the image, the subfloor has a dip of about 1/8th to 1/4 inch, causing a place where there is a cavity under the floor boards....
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Tiles making popping sounds and becoming loose

I have woken up to endless popping sounds in my lounge area (upper floor of the house that was recently extended) and upon investigation, I realised that it’s my tiles making that noise. When I walk ...
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Enclosing an outdoor deck

I have a free-standing outdoor deck. It is 2 ft above the ground and the current decking is 1/2" x 6" with 1/2" spacing. It is in good shape. The deck is 12 ft x 16 ft. I want to ...
Ray Holt's user avatar
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How can I waterproof a subfloor that extends past my exterior wall?

I want to bring an exterior wall of my structure in 6" from a subfloor that I built on top of piers. How can I waterproof the to be exposed subfloor? For background, I am building an accessory ...
Chris T's user avatar
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How to ensure OSB plates are laid straight

I recently started to renovate one of my rooms, in my recently acquired old house. The house is a mix of concrete outer walls and wood joists for the subfloor structure. I plan to use 25mm (1 inch) ...
Alin Andrei's user avatar
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How can I lay Laminate floor around a cavity

the floor I’m laying on has floor cavity sockets, how can I lay laminate around this?
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Water damage to wood subfloors

I live on 1st floor over carport of ‘70’s built wood frame apartment condo. Water leaked from a new kitchen fridge waterline causing water to pool under subfloors for 3 summer months before ceiling in ...
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Vapor barrier underneath hardwood floor?

I am building a 30x46 pole barn with a subfloor (white oak hardwood on top of the Plywood with tar paper in between ). The floor is 8 ft off the ground in which underneath is dry and open to the ...
Zach's user avatar
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Floor Joist with Long Crack [duplicate]

I have a floor joist that has a crack down the center of the board (about 8 feet). I recently noticed it after hearing my floor start to creak above it. There doesn’t appear to be any floor sagging ...
Mike Pak's user avatar
1 vote
1 answer
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How to create a sloped floor for drainage on existing flat level floor joists?

I'm building a traditional outdoor wood-fired sauna cabin. The traditional Finnish ways to build drainage is either gaps in the wood floor to allow direct drainage to the ground, or sloped floors into ...
pkamb's user avatar
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Carpet Replacement Questions

We are having some carpet replaced and have questions: 1. What is this block in the closet? The bedroom where this is being replaced has some weird issues. One is a piece of wooden blocking in the ...
olioxenfre's user avatar
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What's the easiest way to remove Hardie board that's been shot down to cement flooring with a Hilti gun or the hilty gun

In a garage they shot down the Hardy board with the Hilton gun directly to the cement and now the new owners wanted up so they can repair the garage floor.
Shawn O'Neil's user avatar
2 votes
2 answers
149 views

Is my plan to raise floor level about 5 inches ok?

One of my rooms on 1st level has about 5 inches lower level of floor compared to other rooms adjacent to it. I plan to remove existing laminate finish and OSB laid on wood subfloor support beams. As a ...
Daniel Skrobo's user avatar
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Underlayment to meet toilet flange

I recently tore up my half bath tile and quarter inch underlayment to eventually extend my LVP to the bathroom. I’m wondering what I should buy to meet the toilet flange. The tile I had in there was a ...
Colin Wagner's user avatar
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2 answers
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How to know if timbers supporting floor need work?

Pictured is the ceiling beneath our first floor (second floor US). It's an old stone farmhouse, and there's no telling how long those supporting beams have been there (it could be 150 years or more). ...
SingularityFuture's user avatar
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Fill up gap around the new OSB subfloor patch

I need to patch the subfloor after moving the plumbing from under the floor to the wall, in the bathroom. To support the new OSB patch, I've added floating 2x4s and now plan to put the board down with ...
bsong's user avatar
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Repair small section of subfloor

I’m attempting a shower remodel and discovered a small section of rotten subfloor along the outside of the shower curb. I’ve carved out the soft (rotten) part and I now have a 2”x6” hole. Normally I ...
user186314's user avatar
4 votes
1 answer
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How can I support a subfloor patch between joists?

I'd opened up the subfloor in my second-floor bathroom to relocate the plumbing from the floor to the wall. Before I patched the plywood subfloor, I found out that these flat 2x4 joists are ...
bsong's user avatar
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Do I self level the Shower Pan or rip out the brand new 3/4 flooring?

Due to a series of unfortunate events and being in a location where people are not known for being reliable, I've wound up with a 3/4" plywood floor in my master bathroom that is not level nor ...
WastedMoney's user avatar
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Underlayment Situation

I have a small "mill house" built in 1936 with 1,094 sq ft. It was all hardwood floors but now everything has been changed to plywood subfloor except the 2 bedrooms. The kitchen and bath ...
kclark's user avatar
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How should I level a 2nd layer of subfloor?

So I am adding a 2nd layer of subfloor of 5/8. I have a bunch of dips and valleys on the current subfloor. Should I level it before installing my 2nd layer by using shims? Or should I level it after I'...
Guest123's user avatar
1 vote
1 answer
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Is this mortar or concrete subfloor under my bathroom tile?

I am redoing my second floor bathroom because of a leak under the tub which over many years has caused a leak downstairs. I thought it would be easy changing a rotten wooden subfloor… But when i ...
Matt's user avatar
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1 vote
2 answers
186 views

How to install “subfloor” over top of existing hardwood

I recently removed a few layers of different flooring/underlay to expose original hardwood flooring. I’ve been told by two different hardwood refinishers/installers that the hardwood isn’t salvageable ...
Aaron's user avatar
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1 vote
2 answers
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Subfloor, underlayment and backer board [closed]

So long story short… When starting a bathroom rehab I installed 23/32” OSB (exposure 1 panel) and I planned on using 1/4” Hardiebacker board for ceramic penny tile sheets. Finally getting to this ...
Tony's user avatar
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2 votes
1 answer
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Need help on how best to level this floor

I'm planning on installing LVP in my bathroom - it is about 68 sqft of flooring. The floor is unlevel, sloping 3/4" at the worst location. A floor joist had been cut straight through by the ...
Niko's user avatar
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5 votes
2 answers
2k views

Would using glue between the joists and sheathing increase rigidity of the floor?

Consider a standalone, 4 post, 7' high deck, with joists 12" on center, with OSB subfloor sheathing fastened with screws. Would using glue between the joists and sheathing increase rigidity of ...
user2647513's user avatar
1 vote
1 answer
65 views

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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1 vote
1 answer
134 views

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. ...
Troy Blackburn's user avatar
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0 answers
49 views

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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0 answers
52 views

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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0 answers
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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 ...
Mark D's user avatar
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0 votes
1 answer
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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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0 votes
1 answer
142 views

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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-1 votes
1 answer
91 views

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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0 answers
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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 ...
David's user avatar
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0 votes
1 answer
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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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0 answers
58 views

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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1 vote
1 answer
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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
2 votes
1 answer
139 views

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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