Structure above the floor joists and below any finished flooring.

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2
votes
2answers
575 views

For Subflooring, what is the distance needed between screws?

I have 3/8 inch particle board which I am screwing and gluing down to 5/8 plywood. How close together should the screws be?
5
votes
1answer
2k 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 ...
4
votes
2answers
5k 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. ...
2
votes
1answer
93 views

what impact tools are needed for subfloor in the basement?

I would like to know if there are any impact tools that I need to make the subfloor permanent or stable to avoid sound later. I don't want to use DRIcore for this matter.
4
votes
3answers
2k 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
4answers
170 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 ...
4
votes
3answers
462 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 ...
3
votes
2answers
640 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 ...
1
vote
1answer
73 views

How do I patch a hole in the slab under a kitchen island?

This is one step further than How do I remove musty smell in coat closet?. There was a sewage backflow under my kitchen island :( I fixed that problem, but now there's a musty smell in one of the ...
8
votes
4answers
5k 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 ...
1
vote
1answer
571 views

How should I flatten (not level) a concrete subfloor?

In the final stages of finishing a room in our walk-out basement. This particular room has a long history, as it was originally a garage. Thus, it has a slight pitch from the back of the room ...
2
votes
2answers
535 views

Should I continue my basement subfloor under the stairs?

As part of finishing my basement I'll need to rebuild these stairs to account for the higher floor level. The back of this stair case is currently open to the lower basement, but that will be getting ...
3
votes
1answer
177 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 ...
2
votes
1answer
177 views

Can I install Delta-FL in only part of a basement?

I've been looking at finishing my basement and am leaning towards using 7/16" OSB over Delta-FL for the subfloor. I was also considering leaving some areas as bare cement (laundry room, utility room, ...
2
votes
1answer
581 views

How can I stiffen the subfloor of an upstairs bathroom?

I have been doing polished concrete throughout my house. My wife loves it more than I thought she would and now wants me to do it upstairs. I am afraid that the subfloor flexes too much, which ...
4
votes
2answers
602 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?
2
votes
2answers
128 views

How to fix pitched floors in a brick building

I'm looking at a property the was built in the lat 1800s. It's a 3 level brick building with two other building of similar stature on each side. I too a quick look at the second floor, and it pitches ...
7
votes
3answers
11k 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 ...
7
votes
2answers
649 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 ...
3
votes
2answers
549 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 ...
2
votes
1answer
2k 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 ...
5
votes
2answers
3k 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 ...
3
votes
2answers
883 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
2answers
4k 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 ...
2
votes
2answers
708 views

Installing subfloor and hardwood on top of concrete (2nd story)

I bought a condo in a triplex where I basically have all of the 2nd floor. Most rooms are on hardwood, while the rest is on laminate with a serious height difference of an inch and a half (hardwood ...
14
votes
5answers
7k 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 ...
8
votes
2answers
845 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.
6
votes
1answer
523 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
3k 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 ...
9
votes
3answers
14k 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" ...
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 ...
2
votes
2answers
715 views

What type of sub-floor is suitable for laminate flooring?

I'm planning to put laminate type of floating flooring on a floor. The floor has a sub-flooring of 3/4 inch planks and a sheathing of 1/4 inch plywood. I would like to remove the plywood because its ...
6
votes
3answers
1k 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
2answers
2k 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
1answer
2k 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. ...
3
votes
1answer
3k 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 ...
1
vote
1answer
237 views

How can I locate the 2x8 boards beneath subfloor, backer board, mortar, and ceramic tile?

My floor is getting a little creaky in my bathroom. Unfortunately, it has ceramic tile over it (along with mortar and backer board). What I need to do is drill a clearance hole through the grout and ...
6
votes
3answers
6k 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) ...