Structure above the floor joists and below any finished flooring.

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14
votes
6answers
16k views

Should I use nails or screws to refasten my subfloor to the joists?

My subfloor is squeaky, and there's a small window of opportunity I'll have to fasten it down before/during my carpet being replaced. I have available to me a nice corded drill, and an air-powered ...
13
votes
3answers
2k views

How can I speed up the removal of stubborn tile?

I am trying to remove tile from the bathroom floor. It was installed in the 70s, and the pieces are tiny, 1 in x 1 in. I've been hammering away but they're not coming up very easily. Is there a ...
13
votes
4answers
10k views

Does XPS+OSB subfloor need to be anchored?

Mike Holmes is a big fan of OSB/plywood over 1" XPS for basement floors, though his book leaves something to be desired in terms of details. His book says: ...on top of the foam, you want to have ...
10
votes
3answers
23k views

How do I deal with Particle Board Subfloors and Hardwood Flooring?

The house I recently purchased, built in 1973, has particle board subfloors. To clarify, this is not OSB and this is not just a particle board overlay over plywood -- the entire subfloor is 3/4" ...
9
votes
3answers
29k views

How can I prepare uneven concrete basement floor for vinyl planks?

I have roughly 600 sq ft of basement that needs new flooring after some unfortunate flooding this past summer. We had carpet over concrete and are now looking to lay vinyl planks down. There is about ...
8
votes
3answers
1k views

Drywall screws for subfloor

Are drywall screws suitable for attaching a 3/4" tongue-and-groove plywood subfloor? In this case, joists are 16" O.C. and no glue will be used.
7
votes
2answers
1k views

What do I need to do to raise a subfloor?

We're installing an engineered wood flooring in a room that already has a plywood subfloor. The engineered flooring will be 1/4" shy of the height of the hardwood in the other rooms, so I'd like to ...
6
votes
1answer
5k views

Is it safe to use screws in subfloor-to-joist connection to eliminate floor squeak

Getting ready to have some hardwood (12mm laminate, technically) installed in our dining room, and in preparation for this, I bought some 1.25" stainless steel screws that I'll be putting down through ...
6
votes
2answers
5k views

How can I repair a hole in my subfloor?

I found this hole a while back when removing my old carpet: It was filled with a bunch of nice razor blades and nails, you know, the kind of stuff you just want to roll around in. I need to find a ...
6
votes
3answers
10k views

How do I level a basement floor but not the slab underneath?

I'd like to install laminate floor on top of Delta FL in my basement. The basement slab is not level, it slopes (from all directions) towards a floor drain (that, via a pipe, leads to a sump pump) ...
6
votes
3answers
2k views

What should go between a wood plank sub floor and a hardwood strip floor

I am about to install a hardwood floor into a room in my 1905 farmhouse. The subfloor is 8-12" wide 1" thick planks. The floor I am installing is 2-1/4" prefinished solid hickory tongue and groove. ...
6
votes
1answer
881 views

Replacing subfloor in bath

Working on a bathroom remodel project and found rot and water damage to the plywood subfloor around the shower area. The shower is 36" x 36", and the joists are 24" apart and his part of the subfloor ...
6
votes
2answers
6k views

What's the minimum reasonable thickness for subfloor in my attic?

I want to install 4x8 sheets of T&G plywood in my attic for extra storage room, but there are so many different thicknesses. There will be extremely minimal traffic on this floor as I will only ...
5
votes
4answers
206 views

Using leveling compound on plywood subfloor (second story)

I am doing an installation of 1/2" engineered hardwood on the second story of my home. Checking the plywood subfloor for true and level, I found a pretty big dip (1/2") Is this scenario an ...
5
votes
1answer
24k views

How to properly install tongue and groove plywood subfloor?

I'm doing a remodel and can't seem to find the proper method for installing the tongue and groove plywood subfloor over joists. I mean, I think I pretty much understand how to do it but there are a ...
5
votes
1answer
6k 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. ...
5
votes
3answers
4k views

How can I protect the soleplate when framing basement walls?

I plan on finishing my basement and I have a specific question about framing the walls and protecting the soleplate. I plan on framing and setting up the walls BEFORE laying the subfloor, but that ...
5
votes
2answers
26k views

How should I prepare a plywood subfloor for vinyl sheet flooring?

I'm planning on replacing the carpet in my dining room with a vinyl sheet flooring. I know I need to get the carpet, padding and any staples/debris cleaned up before laying the vinyl, but do I need ...
5
votes
2answers
6k views

What type of subflooring should I use for a basement?

My basement has wall-to-wall carpet in the two bedrooms and living area. The carpet was probably from the 70's when the house was built and we decided to remove it. After removing the carpet from ...
5
votes
5answers
2k views

How to support the subfloor around a toilet between I joists

I'm replacing some rotted subfloor around a toilet, and I want to add blocking around the flange for extra support, and to give me a place to support the new pieces of subfloor (I'm not planning on ...
4
votes
2answers
1k views

Should I remove nailed-down plywood before laying tile?

In my bathroom there is vinyl on top of plywood, which is nailed to the sub floor. Should I pry up the plywood before putting down cement backer board for tile, or can I go over the plywood?
4
votes
2answers
75 views

Should we reinforce our laundry floor to prevent our washer from walking?

We have an LG front loading washer that vibrates violently and walks when it goes into the spin cycle. Our house is wood framed, built in 1991, and our laundry room floor is vinyl. We've had ...
4
votes
2answers
13k views

What to do first in a basement? Dricore then frame on top? Or frame and then lay dricore?

My thinking is to use blue wood with a plastic barrier underneath, and then lay dricore up to the finished walls. However, the dricore instructions say that framing should be on top of the sub-floor. ...
4
votes
3answers
4k views

How should I install a plywood subfloor that will be covered by granite tiles?

I am replacing my entryway floor and I have removed the old mud bed. I'm left with planks perpendicular to the joists. However the room is defined at a 45 degrees angle from the joists, so the planks ...
4
votes
5answers
201 views

Can I build a wooden floor over an occasionally moist garage slab with a drain?

I would like to install a subfloor in my garage and turn it into an office. The floor is slanted all towards the middle where there is a drain. There has never been any water (that I've seen in the ...
4
votes
1answer
841 views

Can particleboard subfloor be used as a nail base for 3/4" solid wood strip flooring?

Question: Has anybody out there laid solid oak strip floor over a 3/4" particle board subfloor and lived to tell about it? Basis for question: I did a search on SE and all answers point to pulling ...
4
votes
1answer
1k views

How do I remove musty smell in coat closet?

Recently moved into an older house (1950s built) and noticed that the coat closet has a musty smell. The coat closet is next to the front door and has one wall that is an exterior wall. It has ...
4
votes
3answers
1k views

What is this old 1/16" thick floor-covering, and how do I remove it?

We recently pulled up the carpet in our bedroom, and found this gray covering over the wood subfloor, which seems to be adhered to the wood with a black adhesive (some previous owner scraped away a ...
4
votes
2answers
18k views

What kind of screws are used for plywood subflooring?

I have removed the old bathroom lino and cleaned the parts that adhered to the floor. I want to screw down the existing plywood subfloor because the nails are old (45yrs) and sparse. What kind of ...
4
votes
2answers
2k views

What can I do about a house with internal concrete floor with no DPM?

My partner and I have just bought our first home.A 1950's bungalow which is need of refurbishment. So far it has thrown us a ton of surprises! The worst so far being the floor in one of the bedrooms. ...
4
votes
4answers
251 views

How do you level 1/2“ x 6” flooring planks?

We have a 1920's house with some 1/2" X 6" planks. Unfortunately the floor is in quite rough shape with finger wide gaps in some spots, I started to attempt to sand and flatten it but I think it will ...
3
votes
2answers
9k views

How effective are angle-grinder wood discs for removing material?

I'm working on an old house with 2x8 T&G subfloor planks. All of the structure is sound and has been reinforced but there are areas where the edges of subfloor planks are not level. This has ...
3
votes
3answers
422 views

What is the 2-inch layer of masonry under my bathroom tile?

My house is 1 story, but I have a basement so all the floors on the main level are "upstairs" and have a wooden subfloor. I ripped out the vanity in a bathroom I'm working on and starting taking out ...
3
votes
2answers
1k views

Should I apply waterproofer on the subfloor beneath a shower pan?

I'm going to be using the Kerdi shower pan and membrane to seal a steam shower. I understand the process of installing the membrane, deck and preparing the wall and ceiling substrate. This question ...
3
votes
1answer
5k views

How can I remove just one tongue-and-groove subfloor board?

I am not talking about laminate planks, but actual subfloor sections. My entire room consists of tongue-and-groove boards. I was under the impression that the point of this was so you didn't have to ...
3
votes
2answers
12k views

HE Front End Washer vibrations on wood floors: any tried-and-true solutions?

We recently purchased a new washer and dryer set. It's a High Efficiency front loader washer with the high speed spin cycles. It's causing us grief. It vibrates like crazy. To the point where it's ...
3
votes
1answer
5k views

Is it a good idea to repair a squeaky floor from above?

I have a second floor that squeaks, a lot. Attempts at using scored screws haven't helped much, and the carpet is due for replacement, so there is little concern about pulling it up. A contractor ...
3
votes
2answers
14k views

How to level bathroom plywood subfloor before tiling?

In a bathroom remodeling project, I noticed the newly installed plywood sub-floor is flat but not level, which may cause issues when installing the shower and the sink cabinet (water evacuation and ...
3
votes
2answers
1k views

Is it feasible to cover low-pile carpet with a 1/4" subfloor and vinyl tile in a kitchen?

Scenario: I'm the owner of a multi-unit 2 story apartment. The people living up and down are cousins to each other and are in the process of switching apartments -- long story, don't ask. The upstairs ...
3
votes
1answer
226 views

What to do about subfloor covering sole plates?

My basement already has framing and insulation around the outside walls, along with a few outlets in them. If I were to do 3/4" OSB over 1" XPS for a subfloor the sole plates of those outer walls ...
3
votes
1answer
388 views

“Top layer” plywood subfloor fastened to decking

I just tore out a ton of particle board subfloor that was previously used for carpeting. The entire house has decking (2x6 planks) running on a 45 degree angle over joists with 3/8" plywood over the ...
3
votes
1answer
43 views

Is there any reason not to tile right over a freshly-laid block-and-beam subfloor?

The block-and-beam method of building subfloors is very popular in the UK: Once the blocks are laid, typically a thin bed of mortar or concrete is troweled or poured on top to secure everything. I ...
3
votes
2answers
60 views

Leveling Uneven Subfloor

BACKGROUND: Doing a kitchen remodel on our own, trying to open up existing kitchen into formal dinning room. As soon as the non-load bearing wall is gone, I have this small issue as shown in the ...
3
votes
3answers
266 views

How should I fill in pits in a concrete floor so I can install laminate?

I have these holes in the concrete floor, and I want to install laminate floor. What can I do to fill in these holes to get a nice level surface.
3
votes
1answer
140 views

Is a leveled wood frame for a basement floor a good idea?

Just bought an old house. One half of the basement has a nice headroom. The floor is painted concrete, and is pretty uneven and ultimately slopes towards a floor drain. I'd like a nice floor. Can I ...
3
votes
1answer
172 views

How high can a 'sub floor' be raised withh plywood sheets?

Re-tiling the entryway to my home and had to remove the old mud floor that the old tile had been laid on top of. This lowered my floor by approximately 2" so now assume I need to raise by that much ...
3
votes
1answer
81 views

Securing plywood underlayment to timber sub-floor

I am laying 12mm plywood on existing timber flooring (before laying Hardiebacker board & ceramic tiles). Apart from screwing the ply to the sub-floor, should I also use grab adhesive or thinset ...
3
votes
2answers
246 views

Does it make sense to put quality (=pricy) underlayment over 3/4“ subfloor+1/2” extra plywood layer?

I have standard subfloor + 1/2" plywood on top, to correct for joists going different directions, so that all hardwood boards can be laid one direction for a clean look and avoid sagging where they ...
3
votes
2answers
1k views

Is it a good idea to put 1/4" XPS under engineered floors?

We're pulling out the carpet in a room next to a room with hardwood floors. After removing the carpet and putting down the engineered floor, we'll be 1/4" short of the hardwood. Options: Use ...
3
votes
1answer
97 views

basement subfloor - do i need sleepers for this solution

I'm going to install a basement subfloor. I want to follow option 3 from this site: http://homerenovations.about.com/od/additions/a/BasementSubfloor.htm. A nice option because the foam insulation ...