Structure above the floor joists and below any finished flooring.

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1answer
127 views

When to use concrete plasticizer

When should one use a concrete plasticizer? Should it be used for internal floor slab?
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56 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 ...
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3answers
343 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 ...
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2answers
121 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 ...
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3answers
562 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 ...
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2answers
161 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 ...
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5k views

How To Level Uneven Fireplace Hearth Concrete?

I am remodeling my fireplace. The hearth and mantle were granite/marble slabs (huge ones cut around the firebox). I removed them from the mantle and hearth with a sledge and chisel, expecting thinset ...
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1answer
257 views

How do I repair nail holes in cement board?

The transition strip between my tile bathroom floor and my carpeted bedroom floor is coming up. The nails that (should) hold the transition strip in place are nailed into what looks like concrete ...
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1answer
95 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 ...
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2answers
32 views

Flattening Concrete for Dricore Product Suggestion

I am in the process of laying DRIcore panels in my basement. The ultimate plan is to lay laminate (Pergo) floor once we reach the finish stages. I have a few small areas where the concrete dips ...
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2answers
68 views

What is causing the defined ridge and sunken surrounding floor on my second story floor?

House was built in '87. A defined warp (or ridge) has gradually appeared on my second story floor, in line with the load bearing wall. It appears that the surrounding floor has sunk while the load ...
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44 views

Can you lay subfloor on concrete before framing interior walls?

Our unfinished basement has a concrete floor and poured concrete walls. It has stayed completely dry all year for a decade since the house was built. I will be framing the exterior walls 1" from the ...
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39 views

Raised floor in garage bedroom addition

Do I need to raise the floor to slab height of existing living space (garage floor is 6" lower than living space. I would probably say "yes" due some kind of code for residential flooding. Haven't got ...
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21 views

Can I run a heated floor thermostat on a 30 amp sub panel with a 20 amp GFCI breaker?

Want to install a heated floor in bathroom. I would like to know if I can run it ona 30 amp subpanel wiht a 20 amp GFCI breaker.
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2answers
89 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 ...
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59 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) ...
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3answers
28k 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 ...
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16 views

Floor filler cracking out

I have a situation where a wood sub floor meets concrete and the filler between the 2 keeps cracking out, any suggestions on what I should be using?
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1k views

What kind of subfloor do most people use these days?

I've been reading tons on how to do a subfloor for my basement and I don't seem to be getting any closer to an answer. So far it looks like there are 4 ways to do this: (I'm stealing a good part of ...
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1answer
70 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 ...
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3answers
72 views

Drywall screws snap off when trying to fix squeaky subfloor

I am using 1 1/2 drywall screws from the top of the floor, to stop the squeak. Using screw gun and collated screws. The gun is snapping the heads off the screws, is this OK? And will it stop the ...
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1answer
83 views

Laying new tile on subfloor with old plumbing holes, patch needed?

Laying floor on a subfloor that has old plumbing holes in 3 places. The biggest one is just 2 inches, the rest are smaller. Otherwise the floor is in excellent condition. I'm using ditra. Is it ...
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1answer
21 views

Best approach for squeaky subfloor fix, with some water stains

We are replacing the carpet in our kids room and want to tackle the subfloor as it squeaks. There are two questions I have: 1 We plan on screwing down the existing subfloor, do I need to remove any ...
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1answer
210 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 ...
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2answers
211 views

Should we use regular plywood or Lauan over fir strip sub-floor before laying vinyl?

We are preparing a rental kitchen floor for sheet vinyl or VCT tiles. We currently have exposed 3" wide fir strips as the sub-floor. We were told we needed to lay 3/8" plywood over the fir for ...
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3answers
3k views

How to flatten the sagging OSB subfloor?

I am preparing the subfloor to install engineered hardwood floor by floating installation. However, the subfloor is too much sagging. There is a big area with about 5/32 depth. See: The real ...
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1answer
47 views

How many screws do I need in my subfloor?

In my particular case, I'm building a tiny shed. I'm using ungrooved 3/4 inch treated plywood and no glue, if that makes a difference. I'm not sure what the relevant units are either. Pounds per ...
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2answers
58 views

How two install hardwood floors in a long room with a subfloor that has a plane change in the middle?

I'm installing 3/4 oak hardwood floors in a long room (45') and the floor is flat, with one exception. The house is a 100+ year old brick townhome with the back half built at a later date. Midway ...
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3answers
80 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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68 views

Help translate terminology relating to concrete floor construction

I just bought a house which had an extension done 12 years ago. I am about to do some work in this area and want to understand what has been done before. Below is a screen shot of the bits of the ...
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2answers
1k views

How much of a gap do I leave between the wall and the OSB I am putting down on the concrete for a subfloor?

I am putting down a product similar to the plastic used on the DriCore 2x2 sheets on the concrete for a vapor barrier. I have 3/4" tongue and groove Oriented strand board (OSB) I will be laying down ...
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1answer
38 views

Help! Used Wrong Great Stuff

I was building a subfloor in my basement. 3/4" osb on top of 1" xps, and spray foam around the perimeter. I was in looking at Great Stuff foams saw Floor and Wall saw it was good for subfloors and ...
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77 views

Sealing OSB subfloor from moisture? Patching small gouges?

What are some methods that can be used to seal an OSB subfloor from moisture? And patch small gouges (quarter sized)? Background: Small Bathroom remodel. Tile came up with finger pressure, ...
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1answer
31 views

Do I need a vapor barrier on an 8" pour + carpeting over tile?

So I am finishing my basement and the side I'm finishing has an extra 4" pour on it as well as old 8x8 asbestos tile. My plan is to carpet over it. Do I need a vapor barrier? I get that concrete is ...
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2answers
65 views

Do DRIcore panels need to be flat?

I want to install carpet tile over DRIcore on my concrete basement floor. The floor is far from flat; I would guess at least an inch or two of overall variation. Do I need to ensure the floor is ...
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1answer
171 views

How to flatten an uneven plank subfloor when the existing planks can't be removed?

The upper-floor master bedroom in my c. 1700 house has a plank floor laid across the joists which is quite old, if not original. The planks were apparently once 1/2", but in some areas of the room ...
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1answer
70 views

Secure subfloor underwall between joists

I jumped to quickly into cutting out subfloor in my bathroom and I am now trying to figure out how resolve the issue and get the new plywood in place and secured properly. I cut the sub floor to as ...
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1answer
144 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 ...
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1answer
370 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 ...
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1answer
126 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 ...
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1answer
263 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 ...
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1answer
915 views

How do I replace a sub-floor that goes under a wall before reaching the nearest I-joist?

In a bathroom, due to rotten sub-floor and remodelling, I have to remove the sub-floor and put a new one (we're changing the location of the shower and the sink; the plumber's going to make Swiss ...
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1answer
193 views

Would cork flooring underlayment help with vibration dampening in a sub floor?

Related question: HE Front End Washer vibrations on wood floors: any tried-and-true solutions? In hopes of being able to keep our new front-end HE washer (which we like) I've decided to bite the ...
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2answers
133 views

Basement Subfloor for Moisture Problems

I have a slight moisture problem in the basement. During really torrential rainstorms of 5+ inches of rain, sometimes water seeps up though the concrete floor in the basement. I'm looking at ...
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2answers
90 views

removal of subfloor for exterior wall

This wall is an exterior wall and has 2 layers of flooring, with the wall sitting on top of the floor. I want to remove the flooring and install advantack t&G.I would like to leave the bottom ...
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2answers
2k views

When Laying Tongue and Groove plywood over 1x6 subfloor, do I lay it with the grain perpendicular to the floor joists or to the 1x6 boards underneath?

I am redoing a bedroom and I am in the process of installing a new sub floor. I currently have 1x6 running perpendicular to the floor joists. Some do have a bit of give to them. I am laying over that ...
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1answer
34 views

How to repair void in edge of subfloor from rot?

Started what I thought was an easy job of placing "peel and stick" tile and grout in my downstairs bathroom, but that was until I removed the quarter round at the base of the tub. It is not all the ...
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1answer
33 views

How to patch wood subfloor surrounded by gypsum/gypcrete?

I have a 1'x 2' of wood subfloor in a bathroom corner that is rotted as seen in the picture. It's 3/4" thick. Below it is around 22" of space and the neighbor downstair. I know that much, but I don't ...
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25 views

Basement Floor Installation - Do I need a subfloor or can I use underlayment for warm floor

Live in Vancouver, BC. I'm in the drywall phase of my basement project and we would like to put down vinyl flooring. My unfinished basement has been ultra dry for the last 8 years as it has great ...
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1answer
40 views

Self-leveling alternatives to gypsum concrete (Gyp-Crete, Pyrofill, Securock) over OSB?

Replacement options for < 1.5 inch pour? Details: Bathroom remodel (new tub, tile wall/floor, toilet, vanity). Old tile floor came up with finger pressure, found that the gypsum concrete ...