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Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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Subfloor Water Damage

My wife and I are in contract to purchase a home (not a new home). The inspection revealed a few things and the seller has agreed to fix all but one thing we requested. The one thing they are not ...
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LVP underlayment material

I am replacing carpet with LVP in my bedroom, the LVP is going to flow into the hallway (no transition), I need to raise my wood floor 1/2" in the bedroom to match the height of the hallway, can I use ...
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yellow zinc plated screw to subfloor and stud

Home is built in California late 1990s. I recently removed some nails and screwed subfloor on 2nd floor to joint/stud below using yellow zinc plated screws from HomeDepot. Now I realized it has notes ...
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Edge gluing tongue and groove (non locking) engineered hardwood to make floating floor over existing varnished chamfered-edge hardwood flooring

We wish to lay new flooring above our existing chambered edge flooring. The existing floor is nailed to a plywood sub-floor and is completely flat, about 20 years old. This will make the whole house ...
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How to patch small holes in concrete slab basement floor?

I am preparing to install luxury vinyl plank (LVP) in my basement (specifically CoreTec Pro). The subfloor is just concrete slab. Previously this room had carpet with tack strips nailed to the ...
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Splintered sub floor under kitchen

Just purchased a new house and found a splintered sub floor under neath our kitchen. Anyone see anything like this? Is it a problem that should be addressed immediately?
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Concrete or mud pad below two layers of tile in bathroom. Not sure what it is and whether to demo it?

I recently started renovating one of our bathrooms. After removing a few tiles there was a second layer of tile beneath. Below the second set was a concrete/mortar base that is ~1.5 inches thick and ...
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What causes and how to fix lifting floorboard?

It doesn't seem to want to lift up. I assume it is some sort of tongue and groove board because there are no nails or screws anywhere. When I press down on the lifted part with a lot of force it ...
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63 views

Whats the best way to secure a loose flooring joist where mortar has crumbled over the decades?

My kitchen floor sits on joints that are mostly OK. One wobbles though as I walk over it near a wall. It moves 0.5cm (0.25"). I lifted a floor board and had a look. You can see the crumbled mortar ...
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New Home - Subfloor soft spots

We recently moved into a new 3-story townhome 4 months ago and are under warranty. Two months ago we noticed a soft spot under the carpet in the hallway of our third floor. We pointed it out to the ...
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How do I repair my partially rotted subfloor?

I pulled up the tile in my bathroom and discovered that the sub-floor was partially rotted near the bathtub, under the toilet. Based on the tile/mortar, it looks like whoever did this floor last ...
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Tile over 2x6x1.5 T&G subfloor, spanning 48" beams

Long time lurker, first time poster. I think I might have a solution to my problem but I'd like to get some peer review on it before I start work. I'm remodeling a master bath (50sf, 10x5) in a 1966 ...
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Plywood repair - subfloor prepartion - subfloor leveling

I am installing 2000 sq ft of engineered wood flooring. Some pieces of plywood are missing portions of the top layer. The plywood is 5/8" for 5 x 1/8" layers - I am not worried about strength. How ...
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galvanized hot dipped vs electroplate

I'm considering using nails as an alternative to "backer" screws. The manufacturer recommends "1 1/4" hot dipped galvanized roofing nails" for this application - hardibacker underlayment for bathroom ...
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How to install second subfloor?

I'm putting in 12mm floating laminate with a 4mm felt underlayment in my living room and I noticed some bowing in the current subfloor to the point where I can see it while standing up. The high ...
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1answer
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What STAINABLE wood fill is best to use on a plywood floor? [closed]

I am doing a quick fix on an existing plywood, unfinished floor. I need to fill the gaps between boards before staining, then applying polyurethane. I have plenty of Minwax Stainable Wood Filler to ...
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Second-story floor leveling question for new home

We recently purchased a new home (yes, new construction); the home is a modern-style three story 1800 sqft detached home with a cantilevered section. There's a carport under the cantilever, and then ...
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Can I install plywood over a concrete slab to raise the subfloor height?

We bought a house recently. The living room has a slab concrete and tile above it. The kitchen, dining and hallways are above the basement with plywood then hardwood (ugly) then vinyl at the top. We ...
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Drilling: what's underneath my subfloor?

I have a squeaky floor and I'm trying to use a kit to screw the subfloor to the joists. However, while drilling to find the joists I can go down less than an inch before the drill stops going down ...
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31 views

Can you use Rockite instead of Gypcrete?

Can you used Rockite instead of gypcrete to repair a subfloor in a multi-family apartment repair?
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Squeaky subfloor

Does anyone have any other tips and tricks to stop subfloor under carpet on second floor from sqeaking? There is no access to joists from below due to drywall ceiling. I've seen some special ...
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3answers
787 views

How to repair/replace old tongue and groove plank subfloor in bathroom?

After my bathroom was demoed, I discovered that the subfloor is in bad shape. The home was built in the 1960s and the subfloor consists of 3/4" thick tongue and groove planks running diagonal to the ...
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Should I frame out my foundation walls before or after I install the subfloor?

I'm about to start on finishing our basement and I'm going to put down a subfloor of DMX AG along with 5/8" T&G OSB. Should I frame out my perimeter foundation walls before the subfloor or after? ...
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Need advice on correcting a floor dip

I have an older house (1940’s) with a dip in the hallway leading to my downstairs (1st floor) bathroom. From wall to wall the hallway is 14 feet with the wood floor joists below running parallel to ...
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Tile directly adhered to subfloor

I can home from work last night to find that the contractor began tiling in the master bathroom and is applying the ceramic tiles directly to the existing subfloor. My knowledge isn’t vast, but I ...
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What Kind of Hardwood Flooring Do I Have - Chicago Home Mid50's

I'm beginning a kitchen renovation and the first thing I'm looking into is replacing the tile the previous owners had installed. My entire house is hardwood, possibly original (from 1954), aside from ...
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Dealing with squeaking screws in chipboard flooring?

I've had a problem with squeaking floor since moving in, and after pulling up the carpet and taking a look I've discovered it's down to the screws which have been put into the chip board flooring ...
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3answers
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Can I combine 1/2“ and 3/8” plywood for a total of 7/8" subfloor for laying a hardwood floor?

We have some old flooring that comes to a total (flooring and planks) of 1 5/8" from the top of the joists. I want to add a new section of flooring (this one) beside it, and am trying to get them to ...
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Install subfloor over existing hardwood

I plan on installing a floating floor. The current flooring is hardwood, but is quite beat up, patched and whatnot (It had been carpeted). I thought about sanding and refinishing, but there are so ...
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2answers
52 views

Do I need to level subfloor with a 1/8" step before installing hardwood flooring?

I removed the carpet from the second floor and I noticed that I had termite issues. After replacing the bad plywood subfloor with a new one and I've noticed that it's slightly thicker than the old one....
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1answer
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Will 1/4“ plywood on existing 1/2” plywood suffice under 1/2" cement board for ceramic floor tile?

I'm doing a bathroom with ceramic tile. The subfloor is 1/2" plywood, with joists 16" on center. Can I glue down 1/4" plywood to make it 3/4"? I will use 1/2" cement board with mortar after that. Or ...
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Subfloors in entire house not under walls. Exposed sheetrock from under house crawlspace

Help? So I bought this house earlier this year. My bedroom has always felt clammy and humid. After about a month or two I noticed mildew on the base boards. I pulled up the baseboards and a foot of ...
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Bathroom Subfloor

I need 1 1/2" of subfloor in my bathroom to meet other floors. Can I use two 3/4" OSB? And will that be strong enough for a freestanding tub? The Joists are 2x10 and average out to 16 oc (self built, ...
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How to build up subfloor to 1 3/8" finished height with tile?

My 1960's bathroom floor is down to the 3/4" deck boards that are attached at a 45 degree angle to the joists. There was about 1-1/4" of lath and mortar on these boards for almost 60 years. All the ...
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137 views

Preparing uneven floor for cement board

I have two sections of flooring that are currently uneven by about 1/4". One side is 3/4" OSB, and the other is 3/4" Plywood. Both sides are screwed and glued onto joists. I'm planning on putting ...
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How to level two different floor heights to prepare for carpet?

We have a second floor bedroom that was added onto the old house a long time ago and it is 1.25" lower than the hallway. The bedroom currently has hardwoods. What is the best way to raise the floor ...
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Hole in subfloor under stove: Do I fix? If so do I put flooring over it?

In preparation for porcelain tile installation in my kitchen I removed the vinyl stick-on squares the previous owner threw down before selling and the 1/4" plywood underneath those. When I pulled the ...
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2answers
535 views

Can I 'glue and screw' 1/2“ and 3/8” plywood sheets to substitute for 7/8"?

Replacing damaged parts of a plank floor that is 7/8" thick. Need a level surface to lay another 1/2" plywood subfloor layer. Can I 'glue and screw' a two thinner pieces of plywood (1/2" and 3/8"), or ...
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1answer
135 views

Subfloor: styrofoam insulation between sleepers or strapping on top of styrofoam?

I'm building bedrooms where a basement garage used to be. The floor of the former garage is a concrete slab that I have resurfaced. My plan is to install OSB subfloor and paint it for now, probably ...
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1answer
131 views

Clean or Replace subfloor

I removed old stick on tile from my bathroom and this is what my subfloor looks like. All that white is the adhesive. From what I can tell so far there is no mold or rot. Is it work it to remove this ...
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How to remove tile with mesh embedded in cement bed?

I am doing a bathroom remodel on a late '60s house. The bathroom tile is set on a roughly 1.5" cement bed with embedded wire mesh. I have removed a small portion with a rotary hammer with a pointed ...
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1answer
58 views

Removal of leftover glue from glued down 3/4 T&G flooring

In the process of removing the 3 different types of flooring in the house we just bought and before we move in get the major things out of the way. Carpet is easy enough for the most part, the house ...
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3answers
414 views

Is 15/32" Plywood okay for Subfloor under tile?

Is 15/32" plywood thick enough to be used as a subfloor under tile combined with a 1/4" hardiebacker board? The joists underneath are 2x8s that are 16" apart on center and only 4' long.
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139 views

How best to remove basement particle board subflooring under framing

Recently bought an old house where the basement has been partially finished. About half of the basement is drywalled and the rest is just open framing. That said, the subfloor in the basement is made ...
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1answer
668 views

How to seal hardwood floor in preparation of self-leveling compound?

I'm planning to float laminate over my existing floor, but need to level it first. The floor area is very large, so it spans areas of the home that have differing subfloor materials: concrete, ...
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1answer
189 views

Installing plywood over 1x6 subfloor in preparation for engineered hardwood

I’m prepping to install ½” thick Armstrong Engineered Hardwood 7” tongue and groove planks in the kitchen and family room in our 1964 home. I have several questions about preparing the subfloor and ...
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173 views

What's the proper height above a subfloor, for an exterior inswing door threshold? Carpet? Tile? Hardwood?

I need to build a custom door threshold for an in-swing exterior door where there's no exterior overhang or porch. At the moment there is only subfloor, no finish floor. How high above the subfloor ...
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bathroom subfloor sloping 1/2" over 5 ft [duplicate]

I just started a bathroom remodel. I removed the subfloor in my bathroom because quite a bit of it was rotted and as I went to install new subfloor I noticed that my joists are not level. I see ...
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1answer
64 views

If I have vapor barrier under joists in crawlspace, is hardwood underlayment a problem?

I have spray foam under the subfloor with vapor barrier. The foam is sprayed to the underside of the subfloor deck, and vapor barrier is attached to the joists bottoms between the joists and the soil ...
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1answer
133 views

How to prepare my floor to install engineered hardwood?

I currently have linoleum flooring in my kitchen, bathroom and laundry room and carpet everywhere else. I would like to install engineered hardwood flooring throughout my home with the exception of ...