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Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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34 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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25 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
41 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
31 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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48 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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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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21 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
33 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
55 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
285 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
150 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
71 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
64 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
27 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
39 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
206 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
433 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
111 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
86 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
43 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
93 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
47 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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57 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
328 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
71 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
126 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
1k 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
89 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
93 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
112 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
132 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
535 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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63 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
83 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. ...
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76 views

Why does my cork subfloor test positive for formaldehyde?

This week I have been having engineered wood flooring installed, with a 1/2 in. cork subfloor installed to help reduce sound transmission between upstairs and downstairs. I bought a tester off of ...
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248 views

Basement Vinyl flooring over carpet

I have a basement with low pile carpet glued to the concrete floor . I would like to cover half of it with vinyl. What should I do? The basement is dry I have two sump pumps. Can I put plywood ...
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1answer
108 views

How to Level subfloor for hardwood

I just pulled up my carpet to install 3/4 solid oak hardwood and found my floors have been built badly, very un-level. 2/3 of the floor is okay in one direction but then it drops off. It is so bad I ...
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2answers
232 views

Fixing squeak in subfloor

I’m having carpet installed in a few days, so I’m going through and pulling up the carpet and pad to put in deck screws in the subfloor plywood where there are squeaks. So far going well, but there is ...
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2answers
247 views

How do I fix/fill this void left by previously tiling around a bathroom vanity

Previous home owners tiled around a vanity, then the vanity needed to come out. Now this void approximately one inch deep is left, and we want to fill it and retile so we can use a wider variety of ...
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1answer
173 views

Looking for the least expensive way to level Basement floor

How can I level my basement floor, which has a 2-3inch dip in the middle?
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1answer
76 views

Sagging Floors and loose floorboards

My house is about 118 years old and I can tell from all around the house that there seems to be a sagging on my floors in one specific area. This sagging is obvious in the first and second floor. Now ...
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2answers
153 views

Why my hardwood floor is buckling

I’ve replaced the carpet in one of our room with hardwood, about a year ago, which buckled up by the end of the summer this year. There is a crowlspace under the house, where I found no leaks, but ...
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138 views

Is it safe to have power cables dangling outside the house?

The bedroom split air conditioner gets it's power cable from the switches in the kitchen and goes under the tile floor to the bedroom. Problem is, it leads to an old switch fuse box thing that is far ...
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2answers
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Damage to the sub floor while scraping tile

I have a question about a hardi backer sub floor. I installed tile 8 years ago and my wife decided she wanted a diferent tile. The sub floor was laid over linoleum with a 1/4 in backer board that was ...
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1answer
226 views

Basement Subfloor — EPS + Plywood

I am planning to take the 1" EPS + plywood sandwich approach to my basement subfloor (pergo on top). I've read conflicting things around the plywood -- is 1/2" ply sufficient? Do I need to do two ...
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1answer
935 views

How do I properly lay a tongue and groove plywood subfloor remodel when joist layout is not always 16" oc?

I'm working on a remodel of a room that spans two different areas of a house. Each area has joists 16" OC but where they come together there is a "short" bay; one where it is not a full 16" between ...
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0answers
240 views

Squeak AFTER Carpet install

We just had new carpet installed. My once quiet floor now squeaks all over. Prior to our last carpet install we'd screwed everything down and it was perfect. The only thing I can think is that they ...
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2answers
341 views

Replacing bathroom carpet with Vinyl

I'm going to replace my bathroom carpet with a Vinyl floor, but want to make sure I get it level and waterproofed. Assuming there's a level subfloor, can I use a regular Aquastop underlay? Whats the ...