Questions tagged [slab]

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How deep should I encase electrical wire in concrete slab

I need to run electrical in concrete slab indoors, I am planning to use 1/2 flexible PVC conduit. It is a residential slab indoors. How deep should I bury it? Is there any code station the depth?
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61 views

Will cutting a trench affect structural integrity of the foundation

I am renovating my kitchen and putting in an island, by the code an island must have an outlet. I will have to put a trench into my concrete slab foundation to make it happen. (To run the electrical). ...
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2answers
69 views

Does a carport slab need expansion joints at interior piers or the perimeter?

I'm planning to pour a pad into an existing open carport / garage area that has mid-span supports resting on poured piers and a foundation wall going around the outside. I'm planning on digging down ...
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2answers
91 views

Will a concrete roof hold the weight of a roof garden?

We are planning to build a roof garden on a flat roof. The area of the roof is 25' x 25'. The concrete slab thickness is 6", and our structural engineer has provided sufficient reinforcements, as ...
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1answer
37 views

Do I need to remove all carpet adhesive residue before using a floor leveler?

We have a slab foundation on our place. The previous owners put down carpet with pad and there's a fair amount of glue and pad residue on the concrete, as well as some paint overspray. We'll need to ...
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1answer
68 views

Correct transition for pvc conduit to liquid tight flexible conduit on a concrete slab

I am installing conduit for a hot tub. I have conduit coming up from underground at the edge of the slab and I wondering how to transition it to liquid tight flexible conduit on top of the slab. The ...
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24 views

Home Bball court of concrete

I am looking to make a basketball court in my yard. Probably gonna be around 36’x25’. I think a concrete truck can bring about 10 yards of concrete. Would a 3.5” thick slab be strong enough? Do I need ...
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16 views

How long does paving slab sealing last?

Context: House in Edinburgh (Scotland) with standard UK 60cm x 60cm paving slabs (like these). if I get a company in to clean and seal those, how long should I expect that to last? The sales people ...
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1answer
91 views

Layered with crushed stone for concrete slab, but heavy rain came

We just got done compacting dirt, filling with 3/4" crushed stones and compacted it again ready to pour concrete. However, extremely heavy rain came. These guys are telling me they really just ...
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2answers
42 views

Leveling off part of concrete slab for floating floor

We are trying to partly level out our slab to build a subfloor. Most of it is level enough but a section that is about 20ft x 5ft starts to slope and fairly aggressively in some parts. I see self ...
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39 views

Techniques for mitigating pavement ants during gut reno in bathroom on slab foundation?

planning a bathroom renovation in a 1950s ranch on slab. Ants appear in several areas where walls meet the floors. Is there a specific practice for sealing the passageways, that expands/contracts with ...
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1answer
34 views

Floor moisture issue, discoloration. What could be the cause?

We've been experiencing an issue across the floor on one half section of the house where there are discoloration spots across the floor. Moisture meter reads high- anywhere from 40-80% on spots with ...
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1answer
47 views

Crack in concrete slab of house - what best to fix it with?

I have had different people suggest bondcrete, polyurethane, silicone and various layered combinations thereof, as well as epoxy, concrete caulk and mortar. In addition, on this stack site a search ...
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2answers
73 views

How to Fix Busted Pipe Under Slab

I have an iron pipe underneath my slab. I busted it this morning when I was working on an adjacent pipe. It is a seam-split, parallel to the pipe's axis (i.e. the split runs long-ways on the pipe). I ...
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19 views

Pouring concrete slab around wood posts of covered porch [duplicate]

I have a covered back porch. Sloped roof attached to the house on one end and supported by four 4x4's which are cemented in the ground on the other end (I assume there are cement footers below the ...
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22 views

How to fix crack in slab foundation wall has 90 degree turn to horizontal below the surface?

First, is this 90 degree switch from the vertical wall to horizontal bottom a normal feature of slab foundations? This is a 1953 ranch in northern Ohio. Red arrow in photo indicates the turn to ...
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64 views

Why is there a hole in my slab?

We had a leaky pipe burst over the weekend. It seems that it had been leaking (slowly) for some time, so there's some water damage to the wall where it was located. In order to clean it up, I removed ...
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2answers
323 views

Can the kitchen sink waste pipe run from where it comes out of the concrete slab to the sink by running horizontally under the cabinet floor?

We are converting a peninsula into an island and need to move the kitchen sink. As a result the waste pipe in the concrete slab comes out in the front (see photos) instead of the back. We don't want ...
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1answer
118 views

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
68 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
305 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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30 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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2answers
283 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
190 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
169 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
1k 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
50 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
103 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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40 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
15 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
506 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
83 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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33 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
50 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
346 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
201 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
105 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
42 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
206 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
69 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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3answers
2k 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
982 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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330 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
388 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
310 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
113 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
111 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
46 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
121 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
311 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 ...