Questions tagged [subfloor]

Structure above the floor joists and below any finished flooring.

Filter by
Sorted by
Tagged with
0
votes
1answer
19 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 ...
2
votes
2answers
56 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 ...
1
vote
1answer
41 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 ...
1
vote
3answers
19 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 ...
0
votes
1answer
25 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 ...
0
votes
2answers
25 views

Stiffen Floor with bridging between open web floor Trusses?

The subfloors in my new construction home are pretty squeaky and there is a good amount of deflection. I am looking at some simple DIY things that I can do hopefuly reduce the bounce and squeaks. Most ...
0
votes
1answer
47 views

Should I raise my subfloor when moving from 3/4" hardwood to thinner laminate?

When moving from a 3/4" hardwood floor to a thinner product such as engineered or laminate which is usually 8mm or 12mm, do you typically want to offset the lower profile of the new product by ...
0
votes
1answer
36 views

Laying tile over small section

I have a small section in my house that acts as "utility closet" that does not have tile like the rest of the adjacent environment (sorry for the junk laying around): My plan is to use some ...
1
vote
1answer
65 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 ...
1
vote
0answers
46 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
vote
1answer
20 views

New floorboards upstairs now sounding drum-like when I walk on it. How do I add sound proofing after gluing the panels in?

In an upstairs bedroom, super squeaky tongue and groove planks were removed, and large panels were put in. I used that expensive tape on the joists, the panels were all cut to fit with tiny gaps by ...
0
votes
1answer
27 views

How to anchor floating toilet flange

I have a cast iron toilet flange that sits about .4 inch above a 3/4" plywood subfloor. It feels very solid, but it is not anchored to anything. There are two empty holes in the flange for ...
0
votes
0answers
12 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 ...
2
votes
1answer
35 views

Are expansion gaps necessary in a plywood shed floor?

I'm building a 2.4m x 3m (8 x 10) shed/office in my garden. For the subfloor, I am going to use two layers of 18mm (3/4 inch) plywood. The second layer is there because I plan to tile the floor and ...
1
vote
1answer
47 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 ...
2
votes
1answer
29 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 ...
0
votes
1answer
43 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 ...
0
votes
1answer
29 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 ...
1
vote
0answers
56 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 ...
2
votes
1answer
29 views

Replacing strips between subfloor and underlayment

I am installing vinyl flooring and am looking to replace the strips between my sub-floor and underlayment. Main reason is because I had particle-board glued on top and had to replace it and I'm ...
1
vote
2answers
61 views

Replacing particle board subfloor with plywood

I am hoping someone will be able to give me advice on how to proceed with my project. I am installing vinyl flooring and noticed the particle subfloor was rotten in a spot. I decided that I wanted to ...
2
votes
2answers
54 views

How do I deal with 3" subfloor overhang and extreme joist notch

I have two distinct problems I found after removing a replacement piece of subfloor that a previous owner had cut and put in to place. First is there is a very large notch (12") created in a joist so ...
1
vote
0answers
34 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
vote
1answer
52 views

Subfloor Dilemma

Hello Folks wiser than I! So here's my deal: I'm currently going for an install of luxury plank vinyl in a small bedroom of a very old house...the only thing is, my sub-floor is patchy and odd with ...
2
votes
6answers
204 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,...
1
vote
1answer
44 views

Can I use liquid floor leveler on a previously tiled wood bathroom floor where I could not get up all of the thin set

This is a 8 x 5 bathroom floor on the second level. The wood subfloor seems to be in good condition, no movement, solid. One section all of the old thin set that came up very nicely. The rest of it ...
0
votes
1answer
36 views

Floorplan reasonability check: would need to put a kitchen drainpipe in a concrete subfloor slub

I'm planning a remodel in an appartment, and the way I see the space would work the best is when I bring a kitchen quite far away from the mainlines. And layout dictates that sink drain pipe should ...
0
votes
1answer
38 views

Redgard between kitchen plywood and backer board

I'm replacing my kitchen floor and have got it down to the plywood. 2 questions please. 1, can /should I use redgard between plywood and backer board? 2, getting conflicting answers, should I apply ...
9
votes
4answers
913 views

Do I need a nailing edge around the perimeter of my room for my new AdvanTech subfloor?

I have torn out the original flooring from by 1910 Victorian so that I can level the joists and install new sound subfloor. I'm using 3/4" AdvanTech T&G subfloor, glued and screwed to the new ...
2
votes
2answers
46 views

Screw sequence for Wood Subfloor to Metal Joists

I’m building a second floor in my metal barn. 12’x24’Space, joists are 2”x6” Metal 16” on center & the sub-floor is 3/4” ply TnG using 1&1/4” self-tapping screws. My questions: What is ...
4
votes
2answers
150 views

Is it OK to use 1/4“ OSB over a standard subfloor before installing 3/4” hardwood on top?

I'm planning to install a hardwood floor to butt up against ceramic tile. The tile looks like it will be 1/4" proud to the wood. Can I install 1/4" OSB over the subfloor, then the paper, then the ...
0
votes
0answers
51 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 ...
4
votes
2answers
137 views

Contact surface between subfloor and joists

I had to remove portions of the existing subfloor chipboard panels (18mm depth), which now I need to replace (I already bought a new P5 panel). The problem is that one edge of the hole is irregular, ...
2
votes
0answers
231 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 ...
1
vote
1answer
371 views

What is the best way to replace the subfloor under load bearing wall

I am in the process of replacing the subfloor, a few joists, sill plate and header board. With the help of this community I have either worked out a plan or completed most of the parts of this task. ...
2
votes
2answers
59 views

Raised plywood false floor for heavy equipment usages

I don't know if this is the correct stack, since it isn't in a home, but I think it still fits. I have a electronics assembly company, and we run two assembly lines. They consist of several machines, ...
2
votes
2answers
301 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 ...
2
votes
1answer
138 views

What size should sistered joists be when repairing a cut joist?

I need to repair a cut joist in my kitchen floor. I was going to use a header and sister the joists on either side of it. Question: how do I know what thickness of a header I should use? What about ...
5
votes
5answers
6k views

Can I install heat mat and backer board over cork flooring?

I am installing a new bathroom floor. I plan on getting an electric underfloor heating mat, 2 backer boards for under the heating, screed the mat and tile over this. My question is can I place the ...
1
vote
1answer
51 views

Is a gradual 3/4 inch rise acceptable under carpet?

I have a change in subfloor height to contend with. For whatever reason at one doorway of the house the subfloor was built 3/4" (19 mm) higher than the neighboring section. I can install a tapered ...
2
votes
0answers
96 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: ...
1
vote
1answer
105 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 ...
2
votes
1answer
104 views

What is this layer of material in the kitchen floor?

I have decided to replace the linoleum flooring in my kitchen with a layer of LVT Underlayment, and then Vinyl plank flooring. There were sections of the original floor that were not covered by the ...
1
vote
1answer
54 views

Engineered hardwood over uneven basement subfloor?

I purchased a house 2 years ago with a partially unfinished basement but had all the supplies to finish. I am getting around to doing the flooring soon. I have nice oak engineered hardwood flooring ...
2
votes
2answers
328 views

Should I level my basement floor if installing a subfloor?

I'd like to install a subfloor in my basement including that dimple stuff to allow moisture to dissipate. Currently, it has sheetrock walls and trim with painted concrete flooring, but that's it. A ...
1
vote
1answer
440 views

Floor sagging between joist- please help

I recently bought an old home- 102 years old and have some flooring issues. The long story is we bought it knowing it had foundation problems in the rear right corner. The home had a poured concrete ...
1
vote
1answer
104 views

How to minimize waste when installing the subfloor

I need to replace floor in a shed. Existing floor is a hodgepodge of pieces and materials (flat-edge OSB, particleboard), so I'd like to arrange floor from scratch using T&G OSB. What are the ...
0
votes
0answers
46 views

What Medium to Use On Plank Subfloor For Porcelain Tile

Story My wife and I are remodeling our kitchen, and our contractor ask us if we want to remove the hardwood in the kitchen. He said that keeping the hardwood will make the floor solid. I did some ...
0
votes
1answer
34 views

If the top layer of my subfloor is structurally sufficient, can I skip patching plumbing holes in the bottom layer?

I'm doing a master bathroom remodel in which all electrical and plumbing must be moved. The old floor had two layers of plywood: 15/32 as the bottom layer, and 19/32 as the top layer. (The numbers I'...
3
votes
1answer
50 views

Sub flooring requirements for 2 X 1 rectangle tile

I am about to take on a flooring project and I have never done this before. The previous owner did a DIY flooring job and it's horrible. Cracked tiles and chipping grout everywhere. So as I have ...

1
2 3 4 5
7