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Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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22 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
28 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
25 views

What STAINABLE wood fill is best to use on a plywood floor? [on hold]

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
717 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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39 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
56 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
25 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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31 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
534 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
56 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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48 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
38 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
53 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
39 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
54 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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0answers
28 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
47 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
103 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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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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25 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
75 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
85 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
399 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 ...
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2answers
342 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
104 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
102 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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0answers
29 views

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
46 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
356 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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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
565 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
144 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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1answer
133 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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0answers
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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
50 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
117 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 ...
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2answers
85 views

Crowned Floor Joist issue

I picked up Vinyl plank flooring to swap out the carpet in my living room. The second I removed the carpet I noticed high spot that appears to run the width of the living room. When I placed the 6.5ft ...
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58 views

Walked on New Tile

I accidentally walked on some newly-installed (~6 hours old) floor tiles. After this, I nudged them a little to make sure they were still placed correctly. I moved a few tiles about 1/16th of an inch ...
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1answer
477 views

Raise Stepdown Living Room

I am needing to raise my sunken living room 7" to be flush with existing floor. All the outlets and windows are fine as is and the cieling is vaulted so that isnt an issue. Right now there is a ...
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1answer
108 views

How can I even out my subfloor?

I bought a fixer-upper knowing little about how much of a headache I was creating for myself. I've recently removed the hardwood flooring that was lain directly on the joists (no subfloor) of my ...
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0answers
200 views

Install marble threshold for high tile to carpet

I just replaced the vinyl in my laundry room with tile. Due to the cement board+tile, the tile floor now sits ~1/2” higher than the carpet floor in the hallway. I bought a marble threshold to install, ...
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2answers
2k views

Plywood underlayment over plywood subfloor - how to secure

I am taking up carpet & particle board and putting a new layer of 1/2" plywood underlayment over the plywood subfloor prior to installing 3/4" hardwood (nailed down). I know I should orient the ...
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2answers
98 views

How do I lay hardwood over a transition in a room that is not level?

We are going to be laying hardwood in our entire upper floor. The subfloor between two of the rooms is on a bit of a slope. What's the best way to lay the hardwood over this transition. We are going ...
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1answer
105 views

Do I need a subfloor or a Dricore subfloor panels on concrete (basement) for ceramic tile?

I'm trying to do the most intelligent, yet cost efficient method to tiling by concrete basement floor. On some sites, it states to use a subfloor, with the underlayment. Others it states to just ...
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1answer
154 views

How can I remove / replace this OSB floor?

I would like to update the flooring in a carpeted room, replacing the carpet with hardwood. I've removed the carpet, carpet padding, and tack carpet strips. Underneath the carpeting was OSB ...
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0answers
176 views

Proper installation when replacing particle board underlayment with 3/4 advantec over 1/2" plywood subfloor?

My home's flooring was originally 1/2 plywood subfloor with 3/4 particle board underlayment. I have since removed the particle board and plan to replace it with 3/4 Advantec. My current plan is: ...
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1answer
686 views

How flat does a subfloor need to be for laminate?

My kitchen floor is dished. The middle of one interior wall was set on a pier without sufficient compaction. The settling was rapid, as the upper cabinets are set level, while the floor is 2 inches ...
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0answers
75 views

Should I seal this floor or should I just put down vapor barrier before tiling?

I had some water compromise a vanity, leading to its removal. There was a void in the floor where it was originally tiled around, so the entire floor will be retiled. Upon demolition, I noticed some ...
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0answers
96 views

Can I lay 1/2" plywood over existing subfloor that has some damage

Due to water damage I am having to replace about 1200 sq ft of flooring which was all newly installed. However, the way my floor is I'm confused on how to do this without removing the bottom subfloor. ...