Questions tagged [slab]

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Water leaking from garage slab hole patching after foundation repair

I had my foundation repaired last year. They dug couple of holes in my garage slab then patched it with concrete. After that I started to see water coming out from patching area during/after the rain. ...
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1answer
37 views

When to Repair Versus Replace Concrete Slab?

I am a first-time homebuyer and purchased an older home in the Northeastern US. While I've found great infomation here on my many DIY projects, I have not been able to determine whether or not my ...
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3answers
45 views

Suggestions to hold floating laminate floor from sliding on vapor barrier installed over concrete slab

I need suggestions for keeping a laminate floating floor in place during installation on a vapor barrier over concrete. I was hoping to hear of good ideas to prevent this slip/slide effect on the ...
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0answers
29 views

Yellow mesh material in slab foundation cracks

We recently purchased a home in central Florida, built in the late 80s, a stick-built home on a concrete slab. Today I noticed a small uplift and depression through the carpet. Touching the carpet, ...
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1answer
43 views

What would be the potential pitfalls in pouring a concrete patio over deck footings and then securing the posts to the slab?

I am going to have a 4" concrete patio poured in my backyard, and over that I want to build a 2nd story deck. All of this essentially occupies the same space, meaning the posts either need to be ...
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1answer
34 views

Small gap underneath garage's concrete slab on one side that needs to be filled

Previous owner dug a trench right behind the garage to install some pipes as a landscaping drainage solution, but never filled the trench back in after the job was completed. As a result, the bottom ...
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2answers
36 views

Under-slab insulation vs. slab perimeter insulation

Currently in the final planning stages of my new house ("raised ranch" style), and the first floor is going to be slab-on-grade. My current insulation plan has 2" of XPS under the slab across its ...
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2answers
92 views

Do I need to “fill in” concrete control joints before floating floor installation?

I am preparing to install a laminate floating floor over a concrete slab in my basement. The concrete slab is installed in what appear to be 18' x 18' squares, broken up across the dimensions of my ...
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1answer
42 views

Cracks on second store concrete slab…bigger

Since my last posting, I've discovered potentially bigger problems. Any advice on how to deal with these? Just fill? It seems that the previous owner took out the sliding doors and installed windows,...
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1answer
67 views

How to repair cement/flowable-fill slab cracks

I have a 5o yr old condo. The second floor is a cement or flowable-fill slab. There are cracks in areas and a pit in one area. Can I repair the pit and cracks or do I need to tear it all out? [![...
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37 views

Converting old mechanics garages grease pit into a storm shelter

We’re wanting to convert an old mechanics grease pit into a storm shelter. What would be the best way to do. We were thinking concrete for a slab and a wooden door for entrance. What is the best way ...
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0answers
13 views

Preparing concrete slab for porcelain tile after removing vinyl tiles and mastic

My bathroom has VAT (vinyl asbestos tile) and I have taken to removing it by steaming the tiles and peeling them up slowly. For the black mastic underneath I am using BlueBear 500MR which is just a ...
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2answers
76 views

Fixing grade on concrete garage floor?

Here is a concrete garage floor that has a pitch and/or concavities that cause water to puddle inside the garage in the middle of the slabs instead of draining out the front. What are realistic ...
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1answer
75 views

Question Regarding Small Amount Of Grass Clippings Under Slab

Im going to be pouring my first ever slab in 30x26x4 dimensions. This is in North Florida with a high & dry sand base. I've removed the top layer of sod, then some... All with a flat shovel. ...
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0answers
29 views

How can I provide effective access to a subdivided space below a non-structural floor?

One problem faced when finished spaces are built atop concrete slab floors (whether slab-on-grade/slab-as-basement-floor, or a suspended reinforced concrete structural slab floor) is "where do the ...
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2answers
48 views

Deal with humidity in Garage with no vapor barrier

My garage slab has no vapor barrier and I live in Houston which is often wet and almost invariably humid. Water seeps up through the concrete and humidity is always pretty high in the garage. Power ...
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2answers
70 views

What could cause a wet soil / moisture smell on concrete slab

I have a wet soil smell coming from the living room concrete slab. I had to remove all the tile in the leaving room. A remediation company came, they removed the drywall and dehumidified the place, ...
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1answer
53 views

How to inspect/test old capped off drain pipe

I have a roughed-in bathroom in the basement of my 1969 home. There is a 1.5" metal drain pipe coming through the slab. It is capped with a metal cap. I am looking to install a bathtub and use this ...
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2answers
65 views

Does laminate flooring need an independent vapor barrier on concrete?

House is on a slab. Installer and one flooring company says the laminate I am considering has underlayment attached and I don't need vapor barrier. Another installer/flooring company advises it is ...
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1answer
39 views

Do these plastic molds exist?

I want to make a few concrete pavers, so I started looking for a few tutorials, and found this youtube video. In the tutorial, he uses a plastic mold where he pours the concrete. Something like this: ...
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2answers
111 views

Musty Smell in slab and block house

As my title states, I have a house that is on a slab and the exterior and most interior walls are block and covered with plaster. Since we bought the house we have noticed a musty smell that we ...
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1answer
61 views

Can the vapor barrier between a dry floating concrete slab and linoleum flooring be foregone?

I have a two year old house that sits on an 8" concrete floating slab. The slab is insulated below and around the side. The floors in the house are unfinished. That is, the concrete slab is ...
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2answers
1k views

What to use as a screed edge along a brick wall?

I'm planning to pour a concrete slab along a brick wall and need to plan how I will screed it smooth. Three sides of the rectangular slab will have a removable wooden form, but the fourth side is ...
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1answer
509 views

Need More Water in Quikrete than Recommended

I am pouring a series of concrete slabs for a patio and I’m using standard 80lb Quikrete bags (https://www.homedepot.com/p/100318511). The directions recommend 3qts of water per bag and a max of 4....
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0answers
181 views

How to convert bathtub drain to shower?

I have a 1960's house. I am renovating a bathroom, removing bathtub and putting in shower. I will be using Schluter Kerdi-Shower for conversion. I would like to know what parts of that iron drain ...
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1answer
234 views

Would a concrete ramp added to an existing slab be less durable?

To remediate a situation my concrete company caused by changing the layout without consulting me, they propose to add a ramp partially on an existing (though new ~10 days) slab. I'm worried that it ...
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2answers
194 views

Low Height Deck Joist Support Options on Concrete

I'm looking to add a wood/composite deck over an existing concrete slab that has heaved/cracked and looks unsightly. We've only owned the house for a year so I don't have the full history but we have ...
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3answers
82 views

Drainage issue, water causing foul odor in home

I live in an apartment building where the building is built on a concrete slab. There is NO overhead drain pipes or gutters and the water pools up along the side of the building next to my living room ...
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2answers
107 views

Will openings near the corner of a slab compromise its strength?

I'm planning to build a 10x8 shed that will house the pipework and electrical equipment for a new well I recently had drilled. I would like the shed to sit on a concrete slab just for the quality of ...
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0answers
44 views

Cast iron sewer pipe leak? Or something else? Shower pan?

We have a concrete slab and it’s soaked. Water has been coming up through the grout of our ceramic tile. This may have been something that happened over time and we only noticed now. We had a few ...
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2answers
99 views

How much should I worry about this large crack in the foundation slab?

I recently bought a 3-story townhouse in northern Virginia. I pulled up the carpet on the bottom level (foundation is a slab on grade) and discovered a large crack running along the whole room and ...
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1answer
175 views

How to repair porch slab that has bricks embedded inside it

I have a cracked front porch slab at the front corners where it supports two decorative columns that support a small roof covering the entry door. I discovered that the pillars are on a stack of ...
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1answer
315 views

How to increase part of existing internal concrete slab by 300mm

I have a property with a 150mm (6") thick concrete slab throughout. The slab has a step down of approx 300mm / 1 ft, running the width of the house. This means the front rooms are at a higher ...
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2answers
75 views

Having issues removing old tile

I recently started a project to do new floors throughout a house I just bought. We are gonna do about 1600 sq ft in total including the kitchen 2 living rooms, dinning room, and hall. Previously the ...
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1answer
56 views

Patch hole in cement slab when ground below is excavated

I removed a shower stall and there was a hole for the plumbing as expected but once I got a good look the entire area below the cement slab is open. I want to fill the whole as the bathroom is being ...
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2answers
557 views

Is there enough time to pour 40 sqf 4" slab with 60lb bags of premixed concrete if working alone? Any hints?

I am planning to pour 40 square feet of 4" slab to support light shed. I was thinking of using 60LB bags of regular premixed concrete (not fast set). I figured that getting it as ready mix in a truck ...
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1answer
194 views

What type of foundation is best in an area with silt loam soil, cold climate, and high water table?

I'm in the initial stages of planing a structure build, I say structure because what I'm really looking to build is an off grid ( no running water or sewer for staters ) vacation cabin on apiece of ...
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1answer
102 views

How To Remove Stone Slab From A Kitchen

How can I remove this type of blue onyx slab from an old kitchen without damaging corners? I want to reuse it on another house as Onyx is a bit expensive.
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0answers
180 views

Hot water slab leak - floor tiles still warm 24 hours after turning off water

Looks like we have a slab leak in our house. I noticed warm tiles around the laundry area where we have pinpointed the hottest point and the warmth seems to spread about 6 feet outwards. The weird ...
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1answer
2k views

New house concrete slab foundation cracks

I am building a new house in North Texas, it has been 17 days since the foundation was poured, I live close to the construction site, so I've been going 2-4 times a week. Today I finally was able to ...
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4answers
497 views

Jacking concrete slab with shed

We have a 10x10 wooden shed sitting on a concrete slab that is under water when we get lots of rain. Is it possible to raise the entire thing, slab and all maybe 6" somehow to get it out of the water? ...
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2answers
1k views

plastic sheeting under monolithic concrete slab

I'm trying to figure out how to put the vapor / moisture barrier under a monolithic concrete slab. Do I just put the plastic down and drape it over the form, and then cut to ground level when done (...
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3answers
165 views

How to remove concrete slab

I have this concrete slab at the front of my house which I want to remove. The slab has 2 air brick holes in it too. These are surrounded by bricks with cement on to give a rounded look and then ...
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0answers
153 views

Drilling Under Concrete Slab

My church is trying to figure out how to move their soundboard to a different spot in the sanctuary. All the existing wiring for the soundboard (mics, speaker wire, power controls, etc) come in ...
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1answer
219 views

Laying bricks over old concrete sidewalks

I just moved into an old house. The previous homeowner had concrete slabs as the sidewalks that are in touch with the house wall. From what I know, the concrete slabs not only provide a flat solid ...
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1answer
3k views

DIY poly-jacking?

I'd like to reslope the concrete slabs on the side of my house so that water doesn't run up against my foundation during hard rains. Everything I've read about seems to indicate I should do some sort ...
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0answers
149 views

How to fill cracks in concrete slab inside house

My house had some foundation issues and the slab inside the house has separated from the foundation wall mostly all around inside the house. Some cracks are about 1/2" and I'm thinking in filling ...
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1answer
3k views

How thick to pour slab over existing brick patio

I have an old brick patio, cracked in some places. I want to pour concrete over it and stamp the concrete with a texture. What is the thinnest I can go? 1 inch? 2 inch? I have 5000 square feet and ...
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32 views

Leveling a concrete Slab

If I need to level a slab with a 2' sag in the center, should I pour regular concrete up to 1" before using a leveling compound?
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1answer
4k views

Filling large hole in concrete floating floor

I have a big hole in my kitchen floor (inserting a beam and post to take down a load bearing wall), and I'm now left with having to fill this hole (after dumping around 300 mm of concrete on the post ...