Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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36 views

Need to level OSB board for LVP, pros and cons of using roofing shingles?

I am looking into inexpensive options to level OSB for installing luxury vinyl planks. I read an article that talks about using roofing shingles to level out subfloors before installing hardwood. I am ...
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49 views

Should I repair this very small area of minor water damage on my bathroom floor?

I’m getting ready to install LVT over existing VCT in my bathroom, and when I pulled up the shoe molding I discovered that the corner of the floor next to the shower has a slight soft spot at the very ...
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64 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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24 views

Leveling subfloor joists – plane joists or remove support from below

I’m leveling joists in a bathroom floor in preparation for a new subfloor and tile. The bathroom is on the 1st floor with a full height basement below. Two of the joists have a 1/4 inch high spot and ...
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35 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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72 views

Notched TJI Joist

Doing a bath remodel and upon tearing out the drop in tub, I came across a notched TJI joist. (and then some at 4 1/2") There is another joist 5" away so it makes me wonder if the notch is ...
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44 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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2answers
34 views

Correct way to attach 3 layers of subfloor?

I am putting new tile in bathroom which has 1x6 planks diagonally across joists. I need to raise this floor 1 3/4" to match the toilet flange, door jambs etc. What’s the best way? Currently I ...
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18 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 ...
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1answer
60 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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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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61 views

Hardwood Floor Squeaks - Fixing Squeaks or Removal of Hardwood Floor for LVP

I just bought an old house that was build in the 1950s. The house has hardwood flooring all over the house. The hardwood floor squeaks everywhere, not in just a specific spot or area. I noticed that ...
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31 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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79 views

When installing two layers of subfloor, is it okay to secure both layers to joists?

I am in the middle of replacing my subfloor. The old subfloor was two layers, each about 1/2 inch thick, totaling 1 inch. 1-1/8 inch OSB is pretty much out of stock everywhere at the moment so I'm ...
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1answer
81 views

How to correctly level a raised floor built on an old garage floor?

So, I've already tried and failed at this twice and if I'm going to rip up the floor again I want to make sure I do it right this time. I made this room in my basement that used to be a garage and the ...
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1answer
52 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 ...
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66 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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2answers
48 views

I-joists on an old dimensional lumber floor

I’m remodeling a room on my first floor and will need to move a HVAC duct, make it run across 4 joists of the second floor. Room is gutted, and I can see second floor has a 3/4" OSB subfloor on ...
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23 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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41 views

Subfloor question

Can new tongue-n-groove subfloor be butted up against old non-T&G subfloor? And still maintain structural integrity for tile? Details: Remolding bathroom. Moving toilet, bathtub and shower ...
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1answer
36 views

Ok to double plywood under flooring?

My house is on pilings, with plywood subflooring nailed to engineered truss joists, and carpet or hardwood on top of that. I've pulled up the carpet in preparation for installing vinyl plank floors. I'...
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44 views

any way to repair marble tile over subfloor

When I bought my house, its marble floors appeared to be in good condition. However, they have steadily chipped, fissured and fractured until reaching their current fragmented state. The picture shows ...
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57 views

Plane floor joists, sand subfloor, or sand underlayment to handle hump in floor for cork plank flooring?

I am planning to install 5/8 in. plywood underlayment for some floating 1/4 in. cork plank flooring. Unfortunately, there is a hump in the floor spanning three joists, based on my measurement and ...
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1answer
48 views

Plywood vs. OSB vs. AdvanTech - for subflooring?

Bathroom remodel. I'd like to consider: R30 // subfloor // Schluter®-DITRA-HEAT Underlayment // tile . I want to do it structurally correct and not have it squeak or rot, but also want to keep the ...
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31 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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22 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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140 views

Subfloor and Batten Construction of 1950s Hardwood Floor

Recently purchased a 1950s cape cod style home with hardwood floors throughout. They squeak terribly everywhere in the home. As I got ready to tackle this problem with glue and screws through the ...
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1answer
34 views

Tips for avoiding floor impact noise

We had a 2-story extension built, complies with earthquake code in Oregon. It only has a sub-floor right now but the impact noise from the bedroom to the kitchen downstairs is shocking. The final ...
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25 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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2answers
91 views

How should I handle reflooring the bathroom of an old house?

We are updating the bathroom in our old house and after removing the old tile and concrete we found that it was sitting on 3/4" subfloor planks, and some of them are not in the best shape. We are ...
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1answer
29 views

How best to join 2 layers of sub floor?

I have had to raise the subfloor in multiple rooms of my house to bring everything up and level with my kitchen floor. The worst discrepancy is the 1" between the kitchen and den. To level off ...
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352 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 ...
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1answer
38 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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24 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 ...
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2answers
326 views

How do I know if my subfloor is fire retardant or preservative-treated?

I'm getting ready to install COREtec Pro Plus LVP over a wooden subfloor in my 1985 second floor condo. The installation instructions state that "Resilient flooring is not recommended directly ...
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2answers
119 views

Is it ok to blow hot air under the floor?

I have two story house and downstairs is always colder. Head feels fine but feet are cold and you can feel cold coming from the floor. The house have no basement but is built on a concrete slab. The ...
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1answer
169 views

Subfloor repair for LVP installation

I'm preparing to install luxury vinyl plank in the living area of the second floor condo I just bought (carpet was installed previously). It's a woodframe condo with a wooden subfloor built in 1985, ...
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1answer
55 views

Should I mop or sanitize subfloor prior to flooring install?

During the past few months of renovation I tore up a bunch of laminate flooring to address various issues and I am finally circling back to installing the new floating floor. I'm realizing after doing ...
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1answer
108 views

How should I raise the subfloor in one room to match another?

I am installing some new vinyl plank, and I have an issue where my dining room (linoleum) and living room (laminate) meet. The dining room is about 3/8" higher than the living room. I want to ...
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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 ...
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1answer
60 views

How can I immobilise a non-T&G subfloor?

I'm building an 8x10 freestanding office shed. I used 2.5 sheets of non-T&G 3/4" plywood for the subfloor (I know this was not a good call but there's a plywood shortage in my area). I glued ...
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1answer
64 views

Enclosing an attached carport w/ concrete slab. The slab is not completely level. Pour concrete over existing floor or install wooden subfloor?

I am assuming my location may matter on this topic. We live in north Texas north of Dallas approximately an hour. We are enclosing an attached carport w/ concrete slab foundation. The slab is not ...
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1answer
135 views

2nd floor bath remodel. Concrete under tile. What do I have to remove?

I am doing some preliminary research and investigation into remodeling my master bath. The house was built in 2002 so not too old. The master bath is on second floor. I removed the air vent to see ...
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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 ...
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1answer
182 views

Particle board subfloor - cover with additional plywood/osb for luxury vinyl plank flooring?

A friend of mine just purchased a 1 story house and we spent the weekend tearing out the old crappy carpet / vinyl flooring. The subfloor underneath it is particle board rather than plywood/OSB. The ...
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1answer
110 views

Shim under alcove acrylic tub front lip edge after set in morter bed

So I set and level my tub in a morter bed and attached the flange to the studs. At the bottom one third or so of the front flange is not touching but the tub feels solidly in place without noticeable ...
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2answers
116 views

Do I need to remove tub to fix the subfloor? [closed]

I had hired a flooring company to replace vinyl with new tiles. When they removed the underlayment, it turned out there was some mold on the subfloor near the tub (see pics). The flooring guy said ...
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1answer
57 views

Floor leveling compound ontop of glued-down laminate

There is floating LVP currently installed in my kitchen which needs to be replaced. Underneath it is glued-down laminate. There is a small section of the floor that dips down that I would like to ...
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3answers
38 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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1answer
38 views

Removing residual thinset and slight highspots in subfloor before another layer of plywood underlayerment

Removed tile from a plywood subfloor and there is a very small ammount of uneven thinset residue like 1/16" in spots randomly scattered. Not worried about the level as it appear flat but worried ...

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