Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

75 questions with no upvoted or accepted answers
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votes
4answers
980 views

Should I cut air space in my basement foam board insulation?

I intend to finish a part of my basement following this guideline from Fine Homebuilding and Building Science. In this configuration, the foam board completely contacts the concrete. My conern is that ...
2
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1answer
74 views

How to replace basement floor that has begun to rot?

The home I am moving into has a basement that seems to have a rotting wood subfloor. (Not sure if this is the correct term). There is a concrete base, and some inches above, what I suspect to be wood. ...
2
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0answers
20 views

Subfloor revamp in 1950’s apt bathroom

Laying tile and hoping to understand optimal sub-floor solution in a 1950’s apartment bathroom. I removed the following top floor layers: sheet linoleum, linoleum tile, 3/8 plywood. What is ...
2
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0answers
1k views

Moving or closing cold air return

Here is my current situation: There used to be a wall running between two rooms here; with a heat vent on the top side room and what looks like two cold air returns on the other. The issue is, with ...
2
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0answers
290 views

Should I install a subfloor if I'm putting LVP in my basement?

I live in an area with temperatures from -7°F to 118°F. I'd like to put Luxury Vinyl Plank (LVP) in my concrete basement, but I've heard conflicting reports on if I need a subfloor. Some assumptions: ...
2
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1answer
81 views

Under-floor heating and sub-floor

I want to replace my existing carpeted living room with a wooden/laminate floor - as part of this project, I was also considering putting under-floor heating in. Currently, the floor consist of ...
2
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1answer
1k views

How can I seal subfloor gaps before adding a substrate?

I installed a new subfloor sheathing in my second floor half bath. The edges are between 1/4 and 1/2 inch from the wall. In a few spots, the wall edges are not totally smooth do to poor removal of ...
1
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0answers
34 views

Best tool and approach to cut new hole for airbrick in Victorian stone house wall?

It has been recommended by a building surveyor that will install another airbrick in the external wall of our Victorian house to help with airflow in the sub floor. I have seen multiple examples ...
1
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3answers
47 views

Flooring Subfloor Condition How smooth it has to be

Just tore out 800 sf of ceramic tile for installation of laminate flooring. I've spent 2 days on a hammer drill trying to wear down the 30 year old thinset, but there are still quite a few spots ...
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0answers
1k views

How to level a sloping concrete slab with a 2” difference?

I know this sounds bad and I need to give some backstory to not sound off the alarms... I’m going to give the main question first and then backstory below so you know I’m not crazy. Question: We have ...
1
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0answers
535 views

Floors squeak a lot since installing new carpet

Our condo was built in 1989, and I moved in in 2005 with all new carpets. A few months ago (15 years later!), we had new wall-to-wall carpet installed. Now there's creaks and squeaks everywhere in the ...
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0answers
102 views

How to flatten (not level) a concrete slab by shimming a subfloor

I will be working remotely permanently and have a another baby on the way so my current home office is going to be a nursery. I would like to convert a section of my garage into an office, but keep ...
1
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2answers
630 views

Raising a sunken living room floor and concerned about moisture under new raised floor

I am raising a sunken living room floor but have some concerns about possible moisture problems under this raised floor. Here is what I have. A 1979 typical ranch style. It is roughly a 16 x 20 ...
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0answers
98 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 ...
1
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0answers
208 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 ...
1
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0answers
49 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 ...
1
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0answers
79 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 ...
1
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0answers
290 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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0answers
254 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 ...
1
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0answers
1k 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 ...
1
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0answers
3k views

Do I have to seal gaps in my plywood subfloor before I install base cabinets?

I have diagonal board above my floor joists. My contractor added a 1/2" ply subfloor on top of that. The diagonals have maybe a 1/4" gap between them. You can see the diagonals in the picture ...
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0answers
116 views

Insulating tiled floor in the basement?

I'm going to use Prova-Flor + 5/8 T&G OSB + Laminate flooring planks for flooring in my basement, so the total height should be around 1 1/2". I'm not sure what to do about the bathroom, though. ...
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0answers
142 views

Raised floor in garage bedroom addition

Do I need to raise the floor to slab height of existing living space (garage floor is 6" lower than living space. I would probably say "yes" due some kind of code for residential flooding. Haven't got ...
1
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1answer
54 views

Found a Crack in Subfloor when Removing Old Tile

I was removing old tile from my kitchen and found the crack seen in the pictures. I was wondering how big a deal the crack was and how to proceed with trying to lay new tile. I wanted to knock out ...
1
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1answer
262 views

How do I replace rotten Subfloor under a supporting post

Rotten Subfloor goes under support post of my lanai Roof. Best recommendation so far is to cut 3/4 inch thick end off a 2x4 (post is a 4x4) hammer under one side, scrape/chisel out other side of ...
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0answers
47 views

How can I flatten a hardwood floor in preparation for new flooring over it?

I have a second floor with T/G hardwood flooring that is in very bad shape. I have decided the easiest solution for me is to float new engineered hardwood over top of the old hardwood. There is no ...
0
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0answers
66 views

How should I go about leveling my bathroom subfloor?

Over years, after replacing gaskets, replacing the toilet, and using shims under the toilet, I finally began the subfloor replacement in the area beneath the toilet to resolve the toilet not sitting ...
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0answers
42 views

Laminate floor directly over plywood subfloor ok?

We just ripped up carpet in a room and found that it had 1/2" plywood over the joists and 5/8" particle board on top of that. We are planning to install 10mm laminate flooring in this room. ...
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0answers
45 views

How to level a floor that got out of level from a beam breaking underneath the house

So I tried to get pictures, but I couldn't get any that you could really see how unlevel the floors are. I want to be clear, I am a frame carpenter who is familiar with the correct terms, and I am ...
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1answer
72 views

replacing flooring with no subfloor - walls sit on top of finish floor

I need to replace the hardwood floors on the second floor of an old home. A challenge is that the existing floors are nailed directly to the floor joists, with the walls resting on top of the finish ...
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0answers
13 views

Tiling on 1/4“ SurePly + 1/2” OSB fixed subfloor?

I have an insulated subfloor that is ramset in a concrete foundation. The supports for the subfloor are spaced at 16 inches. Most of the flooring are vinyl click tiles, but the bathroom will have ...
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0answers
32 views

Sagging subfloor: wooden planks on joists

The subfloor in the centre of my reception room is sagging by 2 cm compared to the perimeter of the room. I want to lay new engineered flooring. How can I fix the subfloor so that the flooring is even?...
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0answers
68 views

How to build a secret bookcase door in a cased opening?

I'm looking to build a secret bookcase door to a room that is currently just has cased opening entry. The opening is roughly 82" x 80" and my thought process would be to have two doors that ...
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0answers
24 views

How to install a concrete subfloor indoors?

The previous owners of our house enclosed a sunroom with stucco walls. The floor is old cobblestone and brick pavers with dirt underneath but they covered it with a cheap carpet. We're planning to ...
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0answers
32 views

Waterproofing flat balcony over a shed

I have a kid's club house built over a shed part of it exposed as a balcony with flat floor no roof over it . The old floor was an OSB flooring badly damaged with water, so I replaced it with a new ...
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0answers
24 views

What is this floor material consisting of soft fibrous material covered by matte black layer?

We are renovating an apartment in a house in Germany built in 1957. I am unsure what kind of floor construction I am looking at. The concrete floor is covered by a soft brown fibrous layer about 1.5 ...
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0answers
26 views

Proper tool for installing engineered wood flooring

Lauzon 3 1/4 planks, tongue-and-groove. To clarify, it's the stuff with 1/8" real wood on top. Over OSB sub-floor. This is all new construction. About 500 sf right now, but another 500 sf about 6 ...
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0answers
567 views

What's the difference between Henry 547 UniPro and 549 Feather Finish?

I'm preparing to smooth out my 3/4 tongue-and-groove plywood subfloors for an LVP installation, using Henry products per the flooring's installation instructions and local availability. I had settled ...
0
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1answer
51 views

Subfloor damage under exterior wall

I am upgrading our kitchen and have found some damage to the subfloor from previous water leaks. These leaks were fixed long ago and there is no moisture in the subfloor or surrounding wood. We ripped ...
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0answers
37 views

Can Liquid Backer Board be used under a floating LVP?

I'm preparing to install COREtec LVP over a 3/4 tongue-and-groove plywood sub-floor in my 1985 2nd floor condo, and there are several areas where I need to level the floor. The installation ...
0
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0answers
34 views

What is the recommended gap between boards when adding a subfloor?

I am laying a 3/4 inch subfloor over a 2” foam barrier. Do the subfloor boards butt up against each other or should there be a gap? I’m presuming a small gap to avoid squeaking? And if a gap, so they ...
0
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1answer
75 views

Plank T&G subfloor / girder repair in bathroom 48" OC

I am doing a complete gut remodel of my bathroom in a 1962 construction home. The subfloor is 1-5/8" x 7" tongue and groove set on 4 x 6 girders that are spaced 48" OC. A leaky toilet completely ...
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0answers
157 views

Insulating under floor boards with foil insulation

I am looking to insulate underneath the floorboards in a ground floor suspended timber floor with no access from below. The joists are 4" (10cm) deep. I have some concerns regarding airflow under the ...
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2answers
465 views

Repair/add subfloor plank patch

what is the best way to repair this? the joist is about 24" apart here. what is the best way to add a piece of plank and support it from the joist?
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0answers
209 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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0answers
112 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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0answers
20 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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0answers
535 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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0answers
382 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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0answers
20 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, ...