Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

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1answer
64 views

Solid wood flooring - Possible sub-floor issue

I am in the process of installing solid wood flooring in the living room and I have just removed the existing laminate flooring and underlay to find the concrete subfloor is in great condition except ...
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26 views

Replacing sub floor, that is under a concrete floor

House was built in the mid 60s. It's on piers with a craw space. While having it leveled, we discovered rot under the half bath. The water leak is fixed. However discovered the sub floor that needs ...
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2answers
97 views

How to prepare this uneven concrete floor for tiles?

We are planning to lay a tile hearth in our fireplace but unfortunately, the concrete subfloor is quite uneven, see pictures. We have had this fire opening widened, so the black damp proof course is ...
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2answers
729 views

Is 1/2" plywood adequate for a slab overlay?

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
672 views

What are the actual dimensions of a 4x8' subfloor plywood panel

If the joists are 16"oc and our plywood is exactly 4x8' and we have to allow 1/8" gap between our plywood panels wouldn't it shift the next panel by 1/8" and then the next by 2/8" ...
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1answer
25 views

Can I use a flooring underlayment in conjunction with a LVP plank that already has an underlayment built-in?

I'm replacing an old LVP floor, which required an underlayment, with a new brand LVP that has an underlayment built-in. I'd think that to mitigate sound and vapor, a reasonable thing to do is to ...
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1answer
83 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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1answer
36 views

Can I screw through wood floor and plank subfloor to joists to prepare surface for tile?

I’m renovating my 100year old house’s kitchen and found that the old existing tile was attached directly to hardwood flooring. This explained why so much of it was cracked even though it is the only ...
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2answers
57 views

Uneven Subfloor in the 2nd story

I am installing laminate flooring in my 2nd story and have come across this in a hallway. The floors otherwise are pretty level, but there is a bad hump where these two pieces of plywood meet. About 1/...
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Can I apply self leveler primer over painted(primer) wood subfloor

The instructions say the wood needs to be bare wood for all the self leveling compounds like Henry/cbp/mapei but there are also plenty of videos that show it being applied to various levels of clean ...
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4answers
1k 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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2answers
537 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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2answers
704 views

Removing glued down particle board from subfloor

I'm in the middle of replacing some old carpet in my house with engineered hardwood boards. They're tongue and groove and I'll be nailing the boards down in the end. To that end, I had to remove the ...
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1answer
86 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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1answer
61 views

Replace strips of tongue and groove subfloor

A corner in my laundry room is sinking/rotted, the construction is tongue and groove with particle board on top. I suspect the rot probably goes into the tongue and groove planks. How do I replace ...
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11 views

Subfloor and underlayment sizing for LVP glued down flooring

I've read many different topics on flooring but haven't seen an answer specific to my questions, so I'll post them here. Thanks for the help in advance! The back-story: I ripped up 40yr old carpet ...
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20 views

What subfloor should I use in the bathroom for LVT?

I need to fit Luxury Vinyl Flooring throughout the top floor of my house, however the floorboards in the bathroom are all at different heights. I know that LVT requires an absolutely flat surface, so ...
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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
133 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
37 views

Subfloor section replacement, leveling within room

I might replace a section of subfloor in my bathroom, the issue is the floor has two layers of glued vinyl and I'm not ripping it all up. How can I raise the section I replace up so the LVP I add will ...
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1answer
53 views

Subfloor hump over joist tied into cantilever

Just bought a house and I’m swapping out floors. There had previously been carpet in this area, but I’m laying down LVP so I need things reasonably flat. There is one part of this room that has a ...
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1answer
34 views

Vinyl tile installation - remove or install on top of existing vinyl?

I've got a small closet in my 1985 condo that contains the water heater, HVAC, and W/D. I'm trying to figure out the best way to get a new floor in there. The existing floor seems to be vinyl tile ...
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0answers
114 views

Can I remove these planks from subfloor?

I am remodeling an upstairs bathroom and have removed the old floor. The subfloor is 2x6 planks between the joists. They are nailed into 2x4s that are sistered to the side of the joists. Has anybody ...
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1answer
37 views

Should I go with laminate if I have bouncy subfloor

I started the installation of a laminate and noticed that some parts of my 2nd floor subfloor is bouncing when I step on it. Even after I install laminate and take a step on it I still feel a little ...
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1answer
94 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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1answer
86 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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0answers
26 views

Subfloor leveling

I have a ~200sq ft room that I would like to install vinyl plank flooring in. The concrete subfloor is not flat. The concrete generally slopes from North to South and from East to West. I believe this ...
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4answers
45k 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
232 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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3answers
49 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
712 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
65 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
52 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
54 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
45 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
96 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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2answers
141 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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1answer
720 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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1answer
207 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
56 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
44 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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7answers
882 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
21 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
28 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
95 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
35 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
98 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
170 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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