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Questions tagged [concrete]

Concrete is composed of cement, aggregate (including crushed rock and sand) and water. In homes, it's frequently seen in the foundation, driveway, sidewalk, patio, and stone walls. Note that bricks use mortar in the joints, not concrete.

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1answer
153 views

How can I mount a railing in concrete steps when I encounter rebar in the hole?

I need to install a handrail in concrete steps. The problem is that after drilling ~2" (5 cm) down into the concrete, the drill bit wouldn't go any further. I suspect I'm hitting rebar. This is about ...
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2answers
302 views

How can I remove a Carpet from concrete stuck down with black mastic/bitumen

I'm currently on restoring a property in the UK. The house was originally a Care Home built in 1987, and was built using standard commercial techniques at the time. The issue I'm having is, at the ...
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1answer
254 views

Repair driveway expansion joint sealant during winter?

We moved into a new construction home this part March. At our first warranty walkthrough, our builder told us that because we were a north facing home, we would have to seal our expansion joint where ...
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1answer
302 views

How to pour concrete over existing slab?

How to pour concrete over existing concrete slab if existing wood framed wall structure is there? And where to place the new vapor barrier?(I have an existing garage that I would like to convert into ...
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0answers
44 views

Extend/splice 12/2 romex along concrete finished wall

I would like to extend some wiring for a counter outlet that is running behind a refrigerator, which currently encased in a metal "cable concealer" raceway. Note: wiring is in a raceway because most ...
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2answers
64 views

What is the best proportion mix cement, sand and aggregate to use in mosaics?

I am pouring mosaic concrete stepping stones to be placed in a city sidewalk. The mosaic will go face down into a form and the concrete poured from the back. I have been having problems with my test ...
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0answers
44 views

Iron bar set in concrete heavily corroded; how to mitigate?

I have a decorative concrete column (solid concrete with rebar) in front of a multi-storey house, about 10m hight. Said column is held by three thick steel bars (6 x 2 cm) that link it to the house, ...
2
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1answer
72 views

Second coat of Quikrete High Performance Self-Leveling Resurfacer

I've just poured a first coat of Quikrete High Performance Self-Leveling Resurfacer and have irregularities due to not pouring each bucket fast enough for the area I'm resurfacing (250 sf) and, i ...
2
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1answer
137 views

Leak with Drywall and Wood Framing

I've got, potentially, a silly question. We're having some work done in our basement, including the addition of a bathroom. The guys working here were working on the main to install the up-flush ...
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0answers
5k views

How long can a concrete pool stay empty when ground water is not a problem?

I live in Las Vegas, you know- the desert. Ground water is not a problem here, when it does rain, it either evaporates incredibly fast or is absorbed very deep very quickly. I also live on a small ...
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0answers
4k views

Do I need a header for an egress window?

I am in the process of finishing a bedroom in my basement. I need to add a window to the room and the selected wall is poured concrete. I need to know if I have to add a header above the window in the ...
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0answers
945 views

Help! enclosed porch/sunroom foundation

We just purchased a home and now that the snow level is not 4 feet high ( we live in central NY ) we see that the concrete patio/foundation has horizontal cracks, and crumbling along the side, corner ...
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0answers
551 views

How do I level a summerhouse concrete base that dips in the middle?

I laid a 4x3 metre concrete base for my summerhouse/office thing. The corners are all level and so the summerhouse sits fine, but it dips in between and so the load bearing battens aren't taking any ...
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56 views

Can I tile over white paint?

Through out the house there is this white substance on the concrete that looks similar to white paint. There use to be carpet with the first owner of the house hence the brown glue, and then there was ...
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2answers
70 views

Should I level my basement floor if installing a subfloor?

I'd like to install a subfloor in my basement including that dimple stuff to allow moisture to dissipate. Currently, it has sheetrock walls and trim with painted concrete flooring, but that's it. A ...
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2answers
51 views

How to seal crevices in dry stack rock wall to prevent gopher activity?

I've recently had a retainer wall built in the landscape using the dry-stack method (see photos). Unfortunately, there has already been two occasions within past month of gopher activity behind the ...
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0answers
43 views

Waterproofing concrete from the ground?

We want to build a table with benches outside. For this, we have a concrete base with vertical rebars (40cm out of the ground). We want to build brick columns for the structure of the table/bench (...
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2answers
60 views

tile over concrete slab

My condo has a concrete slab. We put down engineered wood flooring. There has been some flooding in neighboring condos, which has damaged the flooring. Does anyone have a suggestion for flooring ...
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0answers
27 views

Repointing stone basement

I am looking into which cement to use to repoint our old house (built ~1900) stone basement. I found conflicting advice, some suggesting type N or type S is fine, but some sources suggest that ...
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0answers
33 views

Reducing moisture from semi-finished basement concrete floor

I'm looking for advice for a good way to reduce moisture seepage through my basement concrete floor. My research has turned up several promising approaches: Surface-only treatments Specialty paints ...
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2answers
109 views

Wire mesh or rebar

I am extending my back patio and am planning on reinforcing the new slab. I live in South Louisiana. Should I use wire mesh or rebar for this?
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73 views

How long will a concrete bore plug take to cure?

I have sealed an old abandon deep boring which was 220 feet long. First I poured small stone chips up to 7 feet and poured liquid cement mixed with Dr fixit up to 220 feet. My boring had PVC cashing ...
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0answers
30 views

Sealing leaking cracks in concrete lanai roof that is also an upstairs balcony

First, I want to apologize for the length of this. I like to think I'm a reasonably competent DIYer but this one may be out of my wheelhouse. (and I'm not even sure what type of contractor I'd call ...
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40 views

Can faded stamped concrete be stained to match rest of patio?

Stamped concrete patio has severely faded - assume from sun and water runoff from canopy? Rest of patio and back steps looks great.It has been sealed several times over the years. How do we restore ...
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1answer
96 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
92 views

Approaches to level a concrete floor with shallow pipes

I have a situation very similar to How to level a section of raised concrete floor?. Except, in my case the obvious solution of grinding the high point is not possible. In my hallway I have a raised ...
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1answer
67 views

How can I remove paint splatters from sealed decorative concrete deck?

I have a custom concrete pation & pool deck that is textured / painted to look like wood. It is also sealed. Recently I had the coping on my pool fixed and the guy did a great job but left quite a ...
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0answers
139 views

Minimum Concrete Thickness Over PVC After Rough-In

I just has some plumbing roughed in for my basement. The plumber did an okay job but for some reason routed the drain pipe for the sink under the area where my shower will go. This would't normally be ...
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0answers
23 views

Render internal wall after doorway brickup

As per the picture, I have a room with a bricked up wall. All the walls are concrete. The doorway has been bricked and covered with what I believe to be cement. So far I have sanded the doorway with ...
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0answers
43 views

Water puddle in backyard causing leaking in garage concrete wall

This is what I saw in the backyard of a split level home after a light rain The water was there due to overflow from gutter. I can clean the gutter but the puddle situation must be fixed as it will ...
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0answers
85 views

160mm pvc pipe running through a deep concrete pour - will it crush?

I have am unusual situation. I had to use 160mm pvc pipe to create a wide duct for services connections that must pass about 500-660mm deep through a new footing that's about to be poured. The pipe is ...
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0answers
36 views

Inground trashcan missing neck

I have two in ground trash cans that are missing the neck where the hinge attaches to the lid. When it rains, water gets in and fills the hole. I have a 32 gallon plastic trash can that I put in and ...
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0answers
354 views

Water/ moisture coming through patched concrete hole in basement floor

We had our walls braced last summer and the basement guys had to drill holes in the floor to push the walls back in to place. They patched up the holes with concrete and I've noticed a few times (...
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0answers
76 views

Re-Painting Concrete porch

Hi I have a concrete porch with peeling and cracking paint. Do I need to sand it and then power-wash it before repainting. I tried using an orbital sander with 60 grit sandpaper but it just kept ...
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0answers
81 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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0answers
47 views

New build next to existing slab

I want to build a new structure, with walk out basement joining up to an existing structure that has a slab foundation. Is this possible? what about the slab/footer for the existing structure, how do ...
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0answers
136 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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0answers
422 views

Leaves in concrete showing through

We had a new concrete driveway, sidewalk, and stoop installed in late November (it is now early January). The leaves were still falling around the time of the installation so I asked the contractor if ...
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0answers
420 views

Pouring drainage channel right next to foundation, how to protect the foundation?

Ugh. How can I arrange details on this concrete pour, to not damage the foundation later? This is San Francisco Bay area (no freezing). The visible clay pipe is a high volume gravity drain from the ...
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0answers
538 views

How to repair broken suspended cement slab

The very corner of the cement slab, which forms the floor of my basement, broke off. There was nothing supporting it underneath. the portion that broke off forms a triangle 11" x 10" x 14" x 3-6" ...
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0answers
632 views

How can I stop the dripping from a concrete ceiling?

My uncle built a concrete bunker in the side of a hill over 50 years ago. The shelter seemed to be free of any leaks until just recently in which there is a steady drip in a few spots in the ceiling. ...
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0answers
57 views

Basement Floor Cracks

I have very thin cracks in my basement floor and I'm attempting to patch them before trying my hand at acid staining the floor. I've read some differing opinions on the use of hydraulic cement or ...
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0answers
358 views

Raising internal floor - to screed or not to screed?

The porch of our home has been made part of the interior. We now need to raise the floor to meet the level of the existing floor internally. The total height of the step is 5cm. So the floor needs to ...
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0answers
44 views

Is having concrete bonding primer on top of a layer of concrete stain ok?

I had a bit of a lapse in reason when redoing my concrete floor. I ground down the floor, let it dry, and then applied a concrete stain (two coats). Then, because I wasn't thinking, I applied Behr ...
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0answers
77 views

How to prepare concrete for epoxy floor coating when it's been repaired with a epoxy hole repair?

After taking our garage down to the studs to remediate black mold, and replace drastic termite damage, we intended to just scuff up the former owners concrete paint (I think now it was probably latex ...
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0answers
544 views

How can I level a concrete floor in a basement room?

I have a room in the basement with a concrete floor that slopes 2" over 11 feet. It's finished in that it has drywall, but there is no flooring yet. I need to raise the floor to be level. The room ...
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0answers
57 views

Concrete color — dark blotches

We're building a house that has poured-in-place concrete walls. I like the look of concrete, and we were planning on leaving some areas naked, both inside and outside the house, with some added stain ...
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3answers
444 views

Should a concrete curb at a patio door be built on top of or inset into the slab?

This is going to be hard to explain, so please bear with me. I am shrinking down an old 8' sliding glass door Rough opening from what appears to have been an old garage door originally. The header ...
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0answers
48 views

Type of Reinforcing Mesh for Concrete

I'm looking at getting a lot of concrete work done and am looking to educate myself past the minimal anecdotal information I posses to be better armed when talking to contractors. What kind of ...
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0answers
3k views

Painting Brand new concrete floor - is an acid wash necessary?

I just bought a newly constructed house that has a large (20x20) attached shop with a concrete floor. I want to paint the floor. I've looked at several sites on how to do this, and they all say to ...