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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How to waterproof metalic electrical conduit entrance in concrete wall?

I have concrete garage inside the hill below house level. Electrical metal conduit runs underground and enters the garage at the top of concrete wall. It may 12"-15" below surface. See pictures. It's ...
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31 views

Running irrigation pipes under a large concrete pad

I'm planning on redoing the irrigation system in the back yard and considering extending it to cover the front yard as well. My only problem, the house is completely surrounded by a concrete patio. ...
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Water heater on concrete--should I build a platform? how much heat loss in winter?

I don't know if that title the best way to phrase the question. It's winter(ish) now, and I swear the hot water just doesn't last as long as it does in, say, September. The water heater tank is ...
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Concrete shows under hearth, can I paint?

My hearth has been laid on concrete which stands proud of the floor. The hearth is black and the concrete has a black cement dye in it but looks grey next to the black of the hearth. It has a fairly ...
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79 views

Need advice to prevent runoff water from going into neighbor's yard

I'm looking for some advice on what I can do to prevent runoff water from going into my neighbor's yard. I am an auto detailer so I am constantly washing cars in my driveway. The neighbor also parks ...
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Fill / waterproof large crack / gap in concrete garage floor

Moved into this house about two years ago. In very heavy rain, the backyard floods due to inadequate drainage, and it runs into the garage, under the wall. I used a Concrete Crack Filler ...
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Repairing concrete block on inner part of basement

I have had water seepage into my basement through concrete block for many years. The exterior part of the block is covered by a deck and patio and is not easy to get to. I've mitigated a lot of the ...
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29 views

Installing an 18kg (40lb) projector screen onto a concrete ceiling

I have a large projection screen that I need to install into a (seemingly) pretty stable concrete ceiling -- at least that's what I assume it is -- it sounds very solid when hit with a hammer, ...
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36 views

Best way to remove anchors from concrete?

The people we purchased our home from put up a wall in the 3 car garage between the 1st and 2nd space, but never finished it and I am now looking to remove the entire wall. There are several ...
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Is the proposed solution to this masonry project okay?

We will going to build long interior, round(little bit) shaped staircase (similar to this) from concrete, and I needed to get instructions with physics that it will possible to make it without any ...
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37 views

How should I anchor a hand railing to sandstone steps?

I've got three exterior steps made of natural sandstone. They are 6 ft wide, and 10" thick. I need to anchor a metal handrailing to them. The railing has two feet: 1/4" metal plates with 3/8" holes ...
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How can I level a sagging concrete floor in a condo building?

I am purchasing a second floor condo that has a huge sag in a corner of one of the bedrooms. There is approximately a 1 foot drop in the corner. The issue has been resolved in the basement footings ...
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How can I fix these cracks in my concrete/plaster wall apartment in Paris?

I'm used to working on sheetrock in the U.S. but I now live in France. In my old apartment in Paris, the walls seem to be plaster but could be concrete. It is soft enough to make divots if I dig in my ...
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56 views

What can I do about small pools of water on my garage floor?

I just moved into this house and I have discovered about 20 different size "water" marks. As I haven't parked my car in the garage - I would have noticed it sooner. But what can I do for this ...
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67 views

How should I install flooring over fresh concrete?

I have fresh concrete poured in my basement. Planing to use Metrofloor Engage Select vinyl plank for most of the floor. Contemplating ceramic tile for the bathroom if vinyl is not good enough for ...
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When pouring cement next to a home, how far below the mud line on a stucco home do you need to be to avoid water issues?

how far below the Mud line on a stucco home do you need to be to avoid water issues 1", 2", 3" or more
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48 views

How can I repair a cinder block wall around a sewer line?

After having replaced ~30' of 4" cast iron w PVC, I'm left with two holes in the cinderblock foundation. The holes are the height of 1 block and about 1/2 the width of a block. These leaves a pretty ...
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36 views

How can I level a slab with floor drains?

I just had the slab in my new basement poured about 3 days ago. It turned out terrible. The entire floor is wavy and has up to 1/2 inch dips and bumps every 4 feet or so. I would like to resurface ...
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58 views

Will using concrete anchors in wall studs cause problems?

While installing a wall mount for a 48" TV, I realized I made a mistake. I drilled a ⅜ pilot hole in the wall stud and then installed the anchors provided with the mount that the lag bolts would be ...
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36 views

How should I prepare a concrete slab for plank porcelain tiles?

I have several questions about laying plank porcelain tile on a concrete slab. First do I need to get 100% of the glue from the concrete floor, there are small spots and patches here and there that ...
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61 views

How can I transition from tile to stained concrete?

What are some good ways to transition from tile to stained concrete? We pulled up the carpet that was next to our tile and stained the floor instead of new carpet? I am looking for simple DIY ...
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123 views

How can I remove a parking block from my garage?

So, builders have this thing, for some reason, of installing cement parking blocks a few feet in front of the hot water heater in the garage. I've lived at plenty of places without those and managed ...
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319 views

How to run electrical wire in concrete ceilng?

I live in a condo with popcorn (a.k.a California) ceilings. Next week I'm having them scraped, spackled, and painted smooth. I also want to hang a ceiling light fixture (the dining area desperately ...
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119 views

Can I use a traditional router bit on a small concrete slab? And if no what can I use?

Can I use a traditional router bit on a small concrete slab? And if no what can I use? I'm getting ready to make a coffee table. I know the trick where you put silicone in the corners to achieve a ...
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57 views

Do I need an expansion gap around concrete laid inside a building

We are laying a concrete floor inside a room in an old stone building. Do we need to leave an expansion gap around the edge? The room is open at the front so we are not insulating or anything.
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Which type of mortar or cement to set electrical box?

I have cut out two holes for 4", metal electrical boxes to be set in to the exterior walls of an old block and stucco garage. I need to secure the boxes by setting them in either concrete or mortar, ...
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How to remove a brass concrete anchor?

I have brass anchors like below in the concrete deck around my pool. Today, when I was raising the inner screw to install the cover, the screw was being very difficult. Trying to raise it, the inner ...
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fix for tall concrete steps

I am buying a older home, the back porch steps are concrete and the top step that is just below the porch is extremely low is there a way to add a half step to avoid stepping down so long a distance?
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47 views

Use less water with concrete water reducer?

Reading up on concrete water reducer additives, it says it "reduces water by 5% - 10%". I assume this actually means that it reduces the required amount of water? I.e. I would mix in less water, ...
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93 views

Should I set deck post footings deeply or use concrete footings?

I am building a deck. How about setting 6x6 p.t. posts down on a concrete footing at 4 feet deep (the frost line here) and fill with gravel and soil, and then let the posts run high for the railings? ...
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67 views

How can I grind and smooth a concrete table top?

Hey guys so I just welded up a table and now I am going to make a table top. So here is the problem. I welded the table up and looks square but is off about 2 degrees here and there from heat warpage. ...
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How to fix concrete delamination

When I made some concrete flooring (my first time doing it) I finished the surface while there was still bleed water (I didn't know it better back then). Now 2 months later in a few areas there is ...
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How can I repair a crack in my foundation that is leaking?

We need help and we don't know who to contact and how to fix the problem. We have a crack in the foundation. Pavers on one side, crack where the siding of the house is and then water is coming from ...
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What is the laziest way I can build a non-structural, non-aesthetic cinder block wall to contain compost?

I have a ton of brush that I used to burn, but I recently bought a chipper/shredder and want a spot to compost it along with grass clippings and greens. I also have 3 tons of CMUs that are just ...
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91 views

How do I shave down a sidewalk?

I have a sidewalk where one of the sections that was repaired by a previous homeowner is raised up above the surrounding sections. I've seen some sites on the internet talking about shaving down the ...
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How do weather conditions affect pouring a concrete foundation?

I'd like to understand how weather conditions affect pouring a concrete foundation. Are there concerns about pouring a foundation during cold, snowy, rainy, or otherwise inclement weather? Is it ...
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Can I use a toggle bolt if there's no space behind the drywall?

While trying to install a 14lb metal shelf to the wall, I had learned from a previous installation mishap to upgrade from plastic anchors to something stronger. I picked up a few toggle bots (3/16" w ...
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117 views

Types of floats and trowels for concrete

In Brazil there are basically 3 kinds of floats: Steel (in many shapes), used for smooth finish concrete, spreading mortar for tiles, plastering, etc. Wood (rectangular) used for rougher finish of ...
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Connect new footings to old footings

I have a 7 foot section of an addition that has no footing. It is a square addition, so 3 walls on the back of the house. It is about 13 x 12. One of the side walls is missing about 7' of footing and ...
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99 views

How to indentify if the crack on plastered brickwalls is cosmetic or structural?

First up, I understand these kind of things are best left to experts' inspection and internet forums won't help much. I have called an engineer but until he arrives in a day or two, for my solace, I ...
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84 views

Drilled a shallow hole in concrete ceiling and some water came out. What now?

We are on a ground floor of a condo building and to put up the partitions I drilled a small hole and after about 1" depth the drill fell into a void (about 1" more) and about a quart or so of clear ...
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24 views

How do I remove adhesive from outdoor concrete deck that is textured?

I have an outdoor deck that had the old green carpet truf glued down. I removed it some time ago and want to remove the adhesive from the concrete, it has the brushed finish so the adhesive is in the ...
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66 views

How water proof is concrete?

I'm looking to buy living quarters in this basement level apartment. The only doubts I have are because some ~5 years ago, there was a giant flood in the city and had this building been couple blocks ...
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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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65 views

How to form curved concrete seat for bench with back?

The contractor seems very unsure of procedure. He has put some very thin plastic around the front edge of the curve, holding it in place with wide black plastic tape. It is about 1.5 inches tall. ...
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Dig out some remaining rotted post or just pour in cement [closed]

Will concrete harden although some rotted wood is still in hole?
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184 views

How big a hole do I have to drill in concrete to embed rebar in it?

I have a concrete patio that I'd like to use as the foundation for a CMU wall. I'd like the CMUs to be tied into the patio slab with rebar. I get that the gist is to drill a hole in the slab, put ...
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112 views

Why would cinder blocks be used instead of concrete for a foundation wall?

Saw this video about how to properly lay bricks and dang! It takes more skill and care than I thought. Then I saw a video about how foundations are poured into wooden casts from a big concrete truck ...
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651 views

How realistic is lowering a concrete floor?

So first off, I love basements, its almost like a fetish. Ook.. so this guy is selling a basement in his building and its perfect(got good water, electricity, comms, location and cheap!) except for ...
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342 views

How can I pour a concrete floor over a particle board subfloor?

I want to pour concrete over the particle board subfloor in my living room. I like the loom of stained concrete. We have a crawl space underneath. My question is what product do I use? How thick so it ...