For questions generally relating to the structure and construction of floors in buildings, including designs, materials, support mechanisms, load-bearing calculations, etc. For questions specifically about the top-layer covering of a floor (tile, carpet, hardwood) see the "flooring" tag.

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How should I fill gaps between floorboards?

We have a Girl Scout camp and I'm the new property manager. We have cabins that are on stilt-like legs, approximately 20 years old. The flooring in these cabins has large gaps in between each piece of ...
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3answers
65 views

How can I get 2X6X12's cut at a slight angle so I can build a level floor?

Here's my question - I am turning a friends small garage into a guest room and I need to place a wood subfloor on top of the cement floor. The room is 7.5' wide by 12' long and it slopes at a slight ...
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4answers
2k views

How do I repair a floor joist which has a hole drilled less than 2 inches from the bottom?

I have three floor joists that have approximately 1/2 inch hole in them less than 2 inches from the bottom. Is there a recommended fix or approved method to correct this to meet code? These joists ...
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1answer
38 views

Seamless construction joints on concrete floor

By construction joints I mean the joints between a batch of floor made one day and the new work in a following day. What is the proper way to get the most seamless joints when making finished concrete ...
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1answer
184 views

Bathroom subfloor replacement

I live in a house built in 1981 that has 16 inch spaced floor joists. In wanting to retile the bathroom I have discovered the plywood all around the toilet flange is junk, it expands about 12 inches ...
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0answers
50 views

How can I level sistered floor joists? [closed]

I have a 6' deep and 18' wide roof deck that has water damage. I removed the old flooring and tile. The joists by the stucco railing are rotten. The joists by the house are fine. I removed the rotten ...
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2answers
751 views

How do you sister joists?

I am replacing part of a floor because of water damage. I have removed three layers of flooring. The joists were unaffected by the rot (as was the bottom floor, but I removed it anyway). I only ...
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0answers
47 views

Which should I do first? replacing furnace or resurfacing concrete floor?

I'm going to get two things done in my basement soon (by hiring professionals), but I'm wondering what the right order of operations is. One task is to replace the gas furnace that sits near the ...
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1answer
62 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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4answers
15k views

How do I use 'surface shims' to level out a sloping floor?

Asked a question about leveling my floor here earlier this week, and one of the options suggested sounded appealing, but didn't contain enough detail for me (a not-too-handy, ...
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1answer
141 views

Why cement under upstairs bathroom floor?

I went to tile upstairs bathroom floor and when we pulled up old linoleum and replace subfloor that was rotted we discovered 1 1/2" of concrete poured on top of old subfloor. Why would somebody do ...
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2answers
246 views

how do I level the floor in a sunk in living room

My home has a step down living room. It has carpet on it, but i want to make the floor level with the rest of the house it is about 2.5 inches step down. People keep tripping. I then either want to ...
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2answers
42 views

Direction of wood flooring

Flooring will run long ways parallel to walls in hallway. Then the hallway runs into the living room with a large white brick fireplace at the far end. How should the wood be laid? There is a bank of ...
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3answers
1k views

How can I cheaply refresh parquet in an apartment?

We've recently rented an apartment with seriously damaged parquet. Since the deal is "take it or leave it", we've decided to "mend" the parquet ourselves. Dictionary :) Sorry for my bad english, I ...
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2answers
9k views

How do I do a minor grout repair properly?

I've got grout between some floor tiles that is cracking and coming out in small chips, over time. The tiles and remaining grout are otherwise in great shape. I suspect this is just a problem ...
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1answer
97 views

Filling deep gaps at corners of maple flooring

I have fairly new natural maple 3/4" [about 4" wide] flooring installed. The installer was sloppy and where the flooring butted against doorways (no doors, just open frames), he should have side cut ...
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1answer
85 views

Are all toilet bolts installed from under the floor?

My mom has an older toilet. When is became loose, in order to tighten the bolts she had to hire someone to go under the house. We just got a new toilet. I was hoping to install it as a d.i.y ...
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2answers
18k views

How do I fix a squeaky floor below my carpet?

I have a squealy floor below my carpet on the 2nd floor of my house. It sounds like the subfloor under the carpet is moving up and down a little and makes this awful load squeak when I step down on ...
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0answers
47 views

Raise cupboard floor (under stairs)

We have a 1930s terraced house in London (UK) with a small cupboard under the stairs, its floor space is about 80cm x 190cm. The floor of this area is around 80cm lower than that of the hall that runs ...
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1answer
38 views

Do I need to use a waterproof sealant in my entryway?

Do I need to use a waterproof sealant in my entryway, over the backerboard and under the porcelain tile or is the thinset adequate? Sub floor is above grade, 3/4" plywood. thanks!
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1answer
105 views

How would I go about leveling a sagging floor?

I had all my kitchen cabinets refaced last year. I than decided to replace the counters with granite. When the guy from the counter company came out he did some leveling test. I am putting counters ...
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2answers
239 views

Possible To Put an Epoxy Coating on Particle Board?

Is is possible/recommended to put an epoxy such as Rust-Oleum Epoxy Garage Floor Coating on particle board? Any help would be appreciated! ...
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0answers
167 views

How can I remove self-leveling substance and glue from my floor?

I removed approx. 30 yrs old linoleum from a room that is 6 by 10 meters. Now I have a hard time removing the glue and self-leveling compound which are stuck to the floor. From what I can tell, both ...
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1answer
63 views

Preparation for laminate floor went south

So I've setup few laminate floors so far, and I'm no expert at this but this is what I like to do in my spare time. So I've got a condo in which there were carpets and I teared out those and all ...
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2answers
104 views

How to improve garage floor look and color?

Here is a image of my garage floor. Hi-Res Link This is after a professional high pressure water cleaning contractor that used degreaser and bicarb soda chemicals to try to rid the floor of oil ...
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1answer
173 views

Cover old ugly floor in a rented apartment?

We have to move to an old rented apartment, the floor looks terrible (it's green! and that's the original color!!). How can I hide the shame? I'm looking for the cheapest solution possible (ANYTHING ...
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3answers
132 views

Can floor tiles be installed on walls?

I am building a home and would like to install floor tiles on wall also, please let me know if it possible to install floor tiles on walls?
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0answers
27 views

How can I prevent condensation under vapor barrier on a 1st floor room with flooring?

We bought last year an apartment of the 1st floor. The building has garages and utility rooms right under our level and the two bedrooms face north. One of the bedrooms has actually an external wall ...
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0answers
35 views

How do I seal an existing concrete floor before patching it?

We are patching an old concrete slab and we are having a problem with the glue or concrete seeping through small cracks onto the floor below. Is there something I can seal it with before we pour?
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1answer
104 views

Is plywood or dimensional lumber better for repairing notched joist?

During a recent remodel, I came across a 3 inch deep by 5 inch wide bottom notch in a 3x10 (the beams are that old!). I must say, i'm just a diy'er and even I was beside myself that someone would do ...
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0answers
48 views

How should I install a tongue and groove subfloor over ceramic tiles?

I am really new and not sure what I am doing to be honest. I am laying down a t&G subfloor over ceramic tiles to protect them(I am leasing a store front, owners would like to keep the tiles ...
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1answer
90 views

How do I glue moving ceramic tiles without removing them?

There was a problem with the pipes under the floor, which resulted in several ceramic tiles being removed. At the moment these tiles are back in place. The problem is that 2 tiles next to them, that ...
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0answers
426 views

Leveling basement floor while keeping it sloping to the drain?

I am having similar problem with the basement slope being exceptionally steep around the floor drain (similar to this: How do I level a basement floor but not the slab underneath?). The discussion ...
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5answers
7k views

How can we fix bouncy floors?

Our floors are somewhat bouncy, especially in big rooms with long joists. I think that the main cause is that they used 2x8 joists on 15-20' spans. We are going to replace/install hardwood in ...
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1answer
190 views

Shaving floor joist

I have a small rectangular home 33’ x 26’. It’s built on a walled foundation with 2 x 8 joists running the width of the home and a center I-beam support. At the back of the home they stopped the cross ...
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votes
1answer
65 views

Should the cement floor adheres to the concrete slab?

If I want to use a cement floor (with broadcast color hardener) over a concrete slab (laid over compact soil), should it adheres to it, or be separated? The concrete slab is rough, the cement layer ...
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0answers
60 views

Does this black subflooring need to be replaced?

I'm working on replacing some laminate in my bathroom with tile. I ripped up the laminated and the particle board (which was black near the bathtub) the subfloor underneath appears to be black as well ...
0
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1answer
329 views

What causes uneven floors and can they be fixed?

I've seen two distinct cases. In the house I currently live in, the largest room in the basement has a floor that is uneven. Basically it dips lower towards the middle of the room. I presume this is ...
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2answers
245 views

Why are my floor tiles cracked and how can I lay them again so they won't crack

When I moved into my house, the kitchen has large floor tiles on the floor. Quite a few of these tiles are cracked. I've been told that the reason they are cracked is because under the floor tiles is ...
2
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1answer
114 views

How to make an uneven, damaged 'rustic' tile floor even for tile & parquet laying

I want to lay a tile border & parquet centre in my kitchen. That requires an even floor, ideally level too. The existing floor is an uneven mix of badly damaged tiles, with some parts plain ...
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3answers
2k views

Renovating Crawlspace with Poured Concrete Floor

My newly-purchased 1950s home has a below-grade crawlspace with a poorly-poured concrete floor. Specifically, it is very coarse and looks like it was poured and spread with a garden rake. In some ...
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2answers
1k views

How do I level a concrete basement floor with a 1" dip?

I want to level my concrete basement floor, but on one end it slants down over 1" (over a 3'x15' run). Can I fill this area before using self-leveling compound, to save money, or what else could I ...
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0answers
37 views

Brown Tile Floor Turned White

Living an older home with tile floors. Someone said I should clean it with mix of vinegar and water. I was actually cleaning a cabinet and spilled some of the vinegar and water solution and it has ...
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4answers
20k views

Can I install hardwood floors (not floating) on a concrete floor?

We have recently bought an old house, and the ground floor has a hard floor and is currently covered in tongue and groove laminate - which we hate. We'd like to put reclaimed floorboards down - is ...
0
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2answers
1k 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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2answers
164 views

How can I repair the structure of this floor?

I am working on a house that the concrete piers on the back side have tilted, and pulled the ledger board and header away from floor joists. this resulted in the floor joists dropping over about a 30 ...
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2answers
287 views

Will internal waterproofing solve my moisture problems?

We've been working on our water problem for awhile now. Here's the deal: There is black drain tile under the home (all the way around) tied into a sump crock. Water was only coming in one side. A ...
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1answer
76 views

How to tell if carpet is destroyed after a flood?

The other day ago a water line going to an exterior faucet exploded in the wall and flooded my finished basement. The water level was around 1"-2" high and we imagine the water was running for ...
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2answers
1k views

How can I correct a crowned floor joist?

In my son's bedroom there is a raised spot in the floor along one of the joists. I went into the crawlspace with a level and that joist is bowed up about 3/4" to 1" compared to the other joists on ...
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1answer
59 views

Filling gaps in hardwood floor - what's the easiest way?

I've got an old, beat-to-hell, hardwood floor in my apartment in the kitchen where quite a bit of water ends up on the floor on a daily basis as there's obvious things like a stove and sink, but also ...