Questions tagged [slab]

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Dry Well Against Foundation

I live in a house with a slab foundation. The soil is red clay. One of the downspouts outputs 8 inches above the ground into a small flower bed and walkway. When it rains, a divot is formed into the ...
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integrity of unreinforced 6-inch concrete slab floor for a 15mx20mx1.8m pool

Our church built an in-ground pool with the following dimensions: 15m x 20m x 1.8m (roughly 540cum) in our retreat center. However, no reinforcing bars were added when a 6-inch thick floor slab was ...
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Weed and water "skirt" around a slab

I'm working on plans to put a "skirt" around the slab of the house both for weed control/ termite visual inspection and to stop any water pooling against the slab. I've settled on crushed ...
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What yard drainage solution to choose and what do i do with existing perforated pipe?

I have a buddy who's home is on a slab, when it rains water floods an area by his drive way. He installed 3 short 20-50 foot runs of perforated pvc. One in front that drains at bottom of slope. One is ...
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Is this a foundation problem - void space underneath exterior brick wall

We moved into this house 5 years ago and did not find a piece of dead tree root at the bottom of the wall until yesterday. It seems the previous owner cut the tree, but here is a small damage to the ...
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Can tree roots raise a driveway concrete slab?

One of concrete slabs in our driveway has risen around 10 cm (4 inches) at the higher end and around 5 cm (2 inches) at the lower end as in the photos below. The slab is around 3 meters (10 feet) wide,...
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Can we use hybrid water heater for radiant floor?

We have a concrete slab radiant floor that is currently heating by propane tankless boiler (Lochinvar NKC199N), but as you know LPG is expensive and not quite efficient. Now, I am thinking about ...
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Cabinets Installed Directly on Slab?

I just had some cabinets installed in my kitchen directly on the concrete slab foundation, and the installer didn't use any moisture barrier or anything comparable to ensure the wood products avoid ...
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Prioritizing foundation/slab repair and sewage pipes?

My house is old, built around 1955. It has two outstanding issues, Slab repair (very likely needs to be done, doors don't line up and I see cracks above some sills, it has slab repair before) Sewage ...
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Slab Foundation with Cracks and Uplift in Floors, Driveways and Back Patio

I am buying house for the first time and the home inspection report came back saying there may be potential foundation issues. I have attached screenshots from the report below. This is an 1976, one ...
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Can I build a porch extension on a slab?

I would like to make an extension for our house entry. Our home is a split-level type of house, and the entry is super small (no space for a closet. You enter the house, and there's around 3 feet of ...
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Foam/Poly Jacking Garage Floor?

The door jambs on the two exterior hinged doors for my garage are becoming an issue with being out of square. The floor is otherwise pretty much OK (no cracks, etc.) The floor is part of a 6" ...
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Can I connect these 2 under-slab plumbing vents?

I am trying to move my bathroom wall back a bit (making room for larger vanity), and everything was going well until I took off the drywall and saw that there were vents back there. Why are the vents ...
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Is this crack something that my builder should fix?

The house was built about a year ago. There is crack along the cut and some more on the slab in the garage, which is the first floor of my townhouse.
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3 answers
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What's the "right" level for the surface of a concrete pad? At, above or below grade?

Lots of information about how to lay a concrete pad, but nobody seems to address this overtly. We're building a wheelchair ramp, the bottom is to be a concrete landing slab. We are in the northeast ...
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Sinking Garage Foundation Repair

My garage is attached to my home which is a single level ranch on a slab foundation. The garage has concrete blocks as footing along one wall. The garage floor is its own slab. Both the garage floor ...
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How can I move my kitchen sink drain 18 inches?

I am doing a kitchen renovation and am having a hard time finding a plumber. I am looking to move the kitchen sink that's at a 45 degree angle to no angle requiring me to move the drain line about 12-...
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How to anchor floor lags with concrete slab

I have the apartment with the floor build from wooden lags on concrete slab. The concrete slab is hollow slab 220mm height that is both ceiling of the downstairs neighbours. Wooden lags are now ...
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In Slab Duct Work - Concrete / Cinder Block

I have some weird and what I believe to be abnormal duct under my home. I recently installed a brand new HVAC system and it's not running or performing as desired. I believe I am losing a ton of ...
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OK to forego vapor barrier under concrete slab if pressure-treated sill plate is used along with sill gasket?

Is it OK to forego installing a vapor barrier beneath a concrete slab (garden shed foundation) under the following set of circumstances? there will never be any flooring material placed on the slab ...
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How to run electrical wire in concrete under the tile

I'm running 6 feet of electrical wire from the wall to kitchen island and going to do it this way: make a trench around 1 inch in depth put 1/2 inch flexible conduit there cover conduit with about 1/...
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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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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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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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477 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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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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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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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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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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2 votes
2 answers
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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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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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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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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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2 votes
2 answers
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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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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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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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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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1 answer
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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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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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3 answers
899 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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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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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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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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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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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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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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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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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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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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1 vote
2 answers
910 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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