Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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4answers
43k views

Hardie Board Subfloor—Thinset or No?

I'm remodeling the bathroom in my house that was built in the 1930s. I stripped out the old flooring down to the 1x8 wood planks (about 1/4" between each). I have 1/4" Hardie Board to put down in ...
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1answer
185 views

Wall plate and subfloor repair in bathroom

Replacing tile floor in small (6x5) bathroom with tub, on 2nd story of a condo. After pulling tile, noticed some water damage in corner by tub, on the subfloor and the floor plate in the wall (looks ...
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4answers
2k views

Is it Possible to Coat the Subfloor Around a Toilet Flange to Prevent Rot?

I'm renovating a bathroom. Is there some kind of paint or chemical that I can apply to the subfloor around the toilet flange to keep it from rotting?
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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. ...
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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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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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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
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 ...
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1answer
50 views

Door sticks and drywall cracks, ledger board not level?

I noticed some drywall cracking in the corner above the door frame on both sides of the door and that door is unable to fully close, a few weeks ago all was fine, crack was there but door could close ...
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1answer
44 views

Tips for avoiding floor impact noise [closed]

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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1answer
72 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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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 ...
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2answers
135 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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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 ...
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1answer
702 views

Screw & Glue Subfloor and Screw Underlayment

I'm replacing a floor in a bathroom. I've ripped out everything down to the joists. Is it okay to: a) screw & glue the subfloor AND b) screw the underlayment Should I use nails? I don't ...
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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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1answer
202 views

Do I need so many fasteners and an edge gap for a basement subfloor on concrete?

I'm getting ready to install subflooring in a residential basement, which currently has exposed concrete slab. The concrete is well-cured (50 years) with no moisture problems. The plan is to lay down ...
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1answer
52 views

How to subfloor basement bathroom for tile?

I'm putting a bathroom in the basement. I need to have sub-floor in so I can install a tub and tile the floor. I was either going to use Dricore, or 5/8" OSB laid on top of DMX and fastened with ...
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1answer
42 views

Subfloor and hardwood floor installation:leveling and squeaking

I am installing a wooden subfloor and hardwood floor as part of a project to finish our attic. How do I level the subfloor? And should anything be added between subfloor and hardwood floor to help ...
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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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7answers
759 views

How do you make flush cuts to a precise depth?

I'm renovating a small shed that was built with 2x4 wall studs on top of 2x6 bottom plates, for some reason. I'm realizing that this will create a problem once I get to the drywall and flooring stages,...
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1answer
98 views

What is this subfloor and tile prep

I removed the tile in my bathroom. The top photo shows what it looks like below the removed tile. The bottom photo shows a closeup profile, near the toilet flange. It is 1 inch think with wood ...
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1answer
20 views

Thermal expansion: installing a hardwood floor and subfloor

I plan to add a subfloor in the unfinished attic, and lay down hardwood on top of it. The attic has large temperature swings, from about 50 to almost 100F (something will have to be done about that ...
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2answers
22 views

Can I use a floor patch over this small area of slightly damaged subfloor?

I have this small corner of floor next to the tub in my bathroom where water got in at one point (very long ago it seems), so I’ve peeled back the VCT and vinyl floor layers to reveal that the top ...
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1answer
79 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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1answer
29 views

Questions about subfloor prepping for LVP

This is my first time installing LVP. The subfloor in this doublewide, for the most part, is in good condition but I have questions about a few areas in the subfloor that I am unsure how to handle. ...
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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 ...
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1answer
81 views

Is it a problem to have gaps and holes in the subfloor of a hardwood floor?

I've been pulling moulding and trim off and on for a few days for an upcoming custom closet install. The community was great in helping me to figure out ways to get the trim off the wall. I've ...
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1answer
95 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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1answer
669 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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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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1answer
28 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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2answers
104 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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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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2answers
37 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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1answer
121 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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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 ...
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2answers
93 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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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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2answers
22k views

Filling holes in floor where heating ducts used to be?

I just bought a house which has been converted from forced air to hot water baseboard heating. Someone removed all of the ducts, but left the register covers in all of the floors on the first floor. ...
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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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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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2answers
158 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
117 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
104 views

Floor Sag at Return Duct

I am working on a remodel where the floor is sagging in a particular area. After pulling up the subfloor, it turns out that there is a return duct under that section that goes into the wall for the ...
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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 ...
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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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2answers
30k views

How many screws do I need in my subfloor?

In my particular case, I'm building a tiny shed. I'm using ungrooved 3/4 inch treated plywood and no glue, if that makes a difference. I'm not sure what the relevant units are either. Pounds per ...
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2answers
56 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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