Structure above the floor joists and below any finished flooring.

learn more… | top users | synonyms

2
votes
2answers
463 views

How should I install flooring over fresh concrete?

I have fresh concrete poured in my basement. Planing to use Metrofloor Engage Select vinyl plank for most of the floor. Contemplating ceramic tile for the bathroom if vinyl is not good enough for ...
3
votes
2answers
224 views

What type of subfloor should be used for Engineered hardwood flooring installed on grade concrete slab?

I would like to install engineered hardwood flooring over a concrete slab which is on grade. It is the first floor of the house, there is no basement and the house was built in the 1990's. I have seen ...
2
votes
0answers
41 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.
2
votes
2answers
108 views

How can I level and finish a slanted deck that was enclosed?

Hello everyone I am new to this so I apologize if I seem a little slow mentally. I have a 104 yr old home that at one point had a deck that was completely enclosed. my issue is that the floor was ...
1
vote
1answer
113 views

Can I install T&G Bamboo floor over a sagging subfloor?

The subfloor dips about an inch on one axis across the middle of the room. Structurally, I think this is due to old and rectified foundation issues. Since the dip is just 1-dimensional, can I install ...
0
votes
1answer
20 views

Increasing subfloor thickness under new shower pan

I ripped my old shower down to the studs and joists. The studs were rotten, the subfloor was rotten, and the top of the joists (in some places) were weak and rotten. I plan on replacing some studs ...
4
votes
3answers
111 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 ...
2
votes
0answers
26 views

Stripping parquet floor glue to install underfloor heating

We have a huge lounge in our new house (in the UK) and it is covered with parquet flooring which we dislike. The little wooden blocks are starting to work loose here and there, so I don't see it as ...
3
votes
1answer
47 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 ...
0
votes
1answer
56 views

What type of subfloor should be used for on grade for nail down engineered hardwood?

I am ripping up tiles on the ground floor of my home and would like to install 1/2 inch engineered hardwood. It is over a concrete slab on grade. What is the best and most economical way to do this ...
1
vote
2answers
2k views

Should I replace bathroom OSB subfloor with plywood?

Before we begin, English is not my first language so my terms could be a bit wrong. Considering I'm planning to install 1/4" concrete backer-board over the sub-floor before tiling it again, is OSB ...
2
votes
2answers
971 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 ...
6
votes
1answer
4k 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 ...
1
vote
3answers
121 views

How to remove tar left over from old floor carpet?

Redoing bathroom floors and under the tiles there was really old carpet. I was able to remove the upper layer of it, but there is a tar-like substance stuck on the wooden floor that is very difficult ...
3
votes
2answers
154 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
907 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 ...
0
votes
0answers
22 views

DMX underlayment or DRIcore?

I've seen some great reviews of the underlayment like the DMX one step, but I see a lot of people still using the padded OSB product like DRIcore. Is there any benefit to using the DRIcore type of ...
1
vote
2answers
75 views

HELP! Upgrading my kitchen to ceramic tile floor

So, I've decided to take on this big project. I have a 1/2" plywood subfloor with 3/4" MDF on top. Should I rip out my entire subfloor add a 3/4" t&g plywood then lay 1/2" plywood on top or am I ...
0
votes
1answer
35 views

Additional Subfloor Layer - Glue or Red Rosin Paper

Currently my main level subfloor is joist, 1/2" plywood, then 3/4" partical board. I am in the process of replacing the partical board with 3/4" with Oriented Strand Board Tongue and Groove. After ...
2
votes
3answers
66 views

Is this the correct approach for installing 3/4" Hardwood floor?

So I've been thinking of adding a hardwood floor in my dining room and hallway. This is what I know as of right now. I have Hemlock 2x10 Floor Joists spaced apart 16" OC that span 13 feet and the ...
1
vote
2answers
46 views

Misaligned floor joist hangers

What is the best way to resolve an issue with misaligned floor joist hangers? Our flooring in the kitchen is starting to dip and sag and it is directly related to the fact that the floor joists are ...
4
votes
1answer
12k 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 ...
3
votes
1answer
82 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 ...
1
vote
3answers
13k views

Proper way to install double-layer of subfloor?

I am installing natural tile, so I've had to reinforce the joists a bit and I'm currently working on installing a new subfloor. The subfloor is 3/4" plywood with 1/2" plywood on top of it. The ...
2
votes
1answer
46 views

Support for Tile floor

I have 2x8 (7.25x1.5) what appear to be doug fur or southern pine floor joists on 16" centers in a finished basement. I want to tile a master bath on the main floor. Joists span exactly 11' 4" from ...
0
votes
1answer
97 views

Finishing Attic Floor (Joists Blocking / Insulation)

I moved into a house built in the 1920's several months ago that has a finished attic where the former owner's two teenage boys were living. I want to go from the old ratty carpeting to nice floor ...
2
votes
0answers
43 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, thinset tile ...
12
votes
3answers
999 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 ...
1
vote
2answers
101 views

Bathroom remodel

I am in the process of redoing my upstairs bathroom. I would like to tile the bathroom floor. I have a tile-redi shower pan for the shower floor. Q1: Do I need to put a moisture barrier over the wood ...
2
votes
4answers
14k views

What is a proper high-quality sub-floor preparation for porcelain tile floor installation

I am preparing to do a kitchen remodel where I am replacing an existing tile floor with a new porcelain tile floor. The old floor that is being replaced has several areas where it is not level and ...
2
votes
0answers
55 views

Floor Makes Metal Clang When Walked On - One Room

We have a 3 bedroom, 2 bathroom house. The whole house has hard-wood flooring. One bedroom on the corner of the house has a floor that sounds hollow... When walked on it makes a loud clanging sound... ...
0
votes
0answers
67 views

How level does a wooden sub-floor need to be to put down engineered hardwood flooring?

We did a house expansion that pushed the walls out approximately 6' on 3 sides of a room. We built the foundation wall for the new floors to be 100% level but the old floors were not level in all ...
1
vote
3answers
327 views

Can I remove parquet flooring adhesive by using a heat gun?

I have to remove a parquet floor with possible bitumen adhesive and am unsure how thick the adhesive was applied. I need to remove the flooring to prep for laying ceramic tiling. Could a heat gun ...
2
votes
1answer
117 views

Should I install a floating floor or a staple down for engineered hardwood?

I would like to to put down a DRIcore subfloor over my on grade concrete slab floor and then install engineered hardwood flooring on top of it. Should I staple the flooring to the DRIcore and if so ...
0
votes
0answers
42 views

vapor barrier between sub floor?

A friend and myself are building a cabin in southern california. It doesn't snow often where it is located. The cabin itself is setup on a post foundation and we are almost finished with the ...
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.
0
votes
0answers
44 views

What type of soundproofing does floormuffler offer over a concrete floor?

My mom has a 2nd floor condo and has bought laminate flooring and I'm voluntold to install it. I'm curious if anyone has experience with cork and floormuffler (and similar products) on cement floors, ...
1
vote
0answers
46 views

Floor advice - gaps, leveling, sound improvements and materials

I am a new homeowner and thus new avid DIY enthusiast :) We recently had a new radiator installed and relocated, and had to remove all the existing materials. This is what I discovered (see image) ...
4
votes
1answer
324 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 ...
1
vote
1answer
56 views

When to use concrete plasticizer

When should one use a concrete plasticizer? Should it be used for internal floor slab?
0
votes
0answers
107 views

Can I shave off half an inch of a crowned up 3 by 6" floor joist?

My subfloor is sloping up because of an very crowned up floor joist in the middle of the house. The house is build on footings, and floorconstruction is accessible from underneath. The footings are ...
4
votes
1answer
326 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. ...
1
vote
3answers
184 views

How should I finish a basement with a pitched floor?

I am building a room in the basement where the slab has a pitch. I have already installed had a foam and magnesium board subfloor and my intention is to have a carpet installed on top of that. The ...
1
vote
1answer
40 views

Are there any special considerations for installing laminate on a 2nd floor?

I have installed a lot of laminate in 1st floor rooms, with concrete subfloors. No issues there. Now I'm installing in a second floor bedroom in a townhouse. Before I rip up carpet Im checking to see ...
0
votes
1answer
131 views

How to correct possible subfloor l/360 deflection under live load, when basement below is finished

Installing porcelain planks 6"x 36" with 11mm thickness, in main floor Living room that was previously carpeted. House is 2 story town, 13yrs old. Room size across W 18' x Length joist span of ...
1
vote
4answers
1k 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 ...
0
votes
0answers
23 views

Tongue and groove subfloor

We are installing tongue and groove subflooring in a small (5' x 10') entryway. The base is cement, the subflooring is plywood with a plastic-like grid on back. Do we glue these down?
1
vote
1answer
56 views

How do I replace rotten Subfloor under a supporting post

Rotten Subfloor goes under support post of my lanai Roof. Best recommendation so far is to cut 3/4 inch thick end off a 2x4 (post is a 4x4) hammer under one side, scrape/chisel out other side of ...
3
votes
2answers
5k 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 ...
0
votes
1answer
125 views

What screws for attaching 1/2“ ply to 3/4” ply?

I was using all-purpose screws (1 1/4") to attach my second layer of plywood to the under layer. The top layer does not get screwed into the floor joists. A lot of the screws just spin and don't sink ...