Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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1answer
44 views

How to level two floors?

I have two rooms with different floor level The wall is removed so now I need the floors to be all level. The higher floor has plywood Should I try to put 2x4 and nail into concrete foundation and ...
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1answer
47 views

Joist design for shed/workshop

I am in the process of building a roughly 12' x 16' shed/workshop. It is going to be a pier-and-beam design. There are 8 concrete piers, 4 on each side, that will support 2 4x12 beams. The span from ...
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31 views

Installing Plywood Underlayment over Plywood Subfloor

We are renovating an apartment and trying to install a 3/4'' solid hardwood floor in the living room. We pulled out the existing carpet along with a 5/8''particle board underlayment. Under that we ...
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1answer
11 views

Remove damaged flooring under edge of fiberglass tub and direction of new underlayment

I am currently living in my grandmother's old house (built ~1940 or before) where I have yet to find any previous repairs done correctly. The house is a two bedroom, one bathroom mill house type ...
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1answer
59 views

Using shingles to flatten concrete subfloor

I am installing (floating) 3/8" engineered hardwood over a concrete subfloor with 1/8" underlayment. After grinding high spots and filling in larger voids with self-leveler, I have occasional 1/8" or ...
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1answer
46 views

Subfloor tolerance for engineered hardwood

I am installing (floating) 3/8" engineered hardwood with 1/8" QuietWalk underlayment on a cement slab. I have used a grinder and leveling compound to remove the large valleys and hills. Now I have ...
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1answer
36 views

Spider-like / roots? mold?

We recently discovered our dishwasher was leaking under our flooring into the subfloor (formerly the floor - oak before the previous owner added pergo). We’re in the process of cleaning it up and see ...
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11 views

Preparing plank subfloor for new flooring

I recently bought a house that was built in 1890. Due to the age of the house and some previous issues and general lack of upkeep, the original floors need to be replaced. I plan on laying plywood ...
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1answer
26 views

Proper subfloor for hardwood in a renovation

I'm doing some work on the 2nd floor of a 1955 cape. The subfloor is 3/4" tongue and groove planks and there are 3/4" (maybe 5/8") fir plywood sheets installed over that. The sheets are... odd... ...
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2answers
77 views

Can porcelain tile planks be installed in a crawl space house?

My home is a single story, about 1200 square feet, and is built on a crawl space foundation with a plywood sub-floor. The people we bought the house from had flipped the home after a foreclosure, and ...
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23 views

Would EVA foam under the carpet (for sound proofing) be a fire risk?

I'd like to put some EVA foam under the carpet (above the floorboards) on the first floor bedroom of my house, to dampen the sound of foot steps. The fire safety building regulations (section B2) say ...
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1answer
70 views

Do I need to replace this sub floor after bad tub installation?

I bought this house ~6 months ago and I noticed then that the caulk around this tub was not installed properly. I just barely got around to opening it up and seeing what was underneath and I found ...
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24 views

Laying T&G ply sub-floor over existing 1/2" ply sub-floor. What underlayment should i use between the layers?

I am remodeling my master suite. The original floor was 1/2" play (randomly sized pieces looks like offcuts) with OSB over the ply. When we pulled the OSB up, the builder had tarpaper between the ...
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1answer
35 views

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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10 views

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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1answer
76 views

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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2answers
51 views

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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2answers
36 views

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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1answer
37 views

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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3answers
72 views

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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1answer
70 views

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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1answer
65 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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2answers
196 views

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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1answer
103 views

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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2answers
55 views

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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2answers
61 views

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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2answers
24 views

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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0answers
43 views

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
29 views

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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2answers
754 views

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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81 views

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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1answer
60 views

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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1answer
36 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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37 views

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
1k 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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1answer
77 views

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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72 views

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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1answer
45 views

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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1answer
58 views

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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1answer
83 views

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
76 views

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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31 views

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
321 views

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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0answers
51 views

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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15 views

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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27 views

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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1answer
187 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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2answers
156 views

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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2answers
565 views

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 ...