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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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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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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4answers
157 views

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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5answers
14k views

How to remove construction adhesive from concrete?

We removed a wooden dance floor that was glued to concrete with liquid nails. How do I remove the liquid nails that is all over the concrete floor? Has anyone had success with heat, mineral spirits ...
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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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2answers
913 views

What is the maintenance schedule for a concrete driveway?

I have a concrete driveway that I'd like to keep looking good, and in good working order. What needs to be done to maintain the driveway, and how often should it be done?
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33 views

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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789 views

Is it OK to pave without mixing?

Going upon the advice of a reputable builder, I used Quikrete fast-drying concrete for a small slab outside my house. Not load bearing. His recommendation was to dry-pour the whole thing. Framed, ...
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2answers
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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5answers
1k views

How can I use toggle bolts with limited depth behind them?

I have a predicament, I am putting up a shelf into the wall. The wall is plaster, and then hollow and then concrete. I have screws with toggle bolts on them. The 2 inch screw with the toggle bolt ...
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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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4k views

What is the best choice for patching and leveling concrete before tile install?

We have a small area of concrete foundation that we need to patch and level prior to ceramic tile installation (12×12 tiles). It is concrete that we chipped the old tile mortar off of, so there are ...
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36 views

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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1answer
36 views

Seamless construction joints on concrete floor

By construction joints I mean the joints between a batch of floor made one day and the new work in a following day. What is the proper way to get the most seamless joints when making finished concrete ...
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1answer
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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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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3answers
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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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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82 views

Extremely porous concrete to act as water drain?

Want to create a six to twelve inch wide porous concrete strip about thirty feet long in our backyard over a drain pipe. Normal concrete is porous but the concrete i want is extremely porous. So ...
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6answers
18k views

Do I really need to use primer when painting an unfinished concrete floor?

I'm turning a one car garage into an office and want to paint the floor. I bought some Behr concrete paint, and the guy at Home Depot insisted that I have to put down a layer of primer first. Do I ...
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1answer
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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4answers
656 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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1answer
256 views

How can I patch a concrete porch that separated from the house?

I have a concrete slab as a front porch on a property I recently acquired. This was put in when the house was built. At some point since it was put in, front sunk/settled and the slab separated ...
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4answers
348 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 ...
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421 views

How to repair garage floor concrete damage near apron?

I have a concrete garage floor that is cracking near the apron entry at the overhead door. I'd like to understand how to repair this problem and if it's a project I can handle as a DIY-savvy person ...
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351 views

How should I build a base floor for a large summerhouse?

Hi my question has 2 parts about piles and creating a subfloor. I want to install a 4.8x4.8m (~16'x16') summerhouse; its existing floor is 24mm (~1") floor boards on 75x50mm (~"2x3") floor posts. I ...
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378 views

Is it possible to use molly bolts in concrete?

Is it possible to use molly bolts in concrete? They are generally described as for use in drywall. But I have a project that needs a hook or screw to be taken out from time to time, which is possible ...
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8answers
4k views

Can I hang a heavy weight from a concrete ceiling if I reinforce it with fiberglass?

I'm investigating the possibility of hanging a pull-up bar/ rock-climbing training board from the concrete ceiling in my apartment. The slab is 180mm (7inches) thick and the (static) weight which I ...
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136 views

How to remove flaking concrete sealer/paint

After my basement flooded and I removed the carpet I found the previous owner had sealed the floor but it's flaking up now and I want to remove it all. It's about 200 sqft so a wire brush by hand is ...
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2answers
252 views

Few questions about concrete/cement wall inside of the apartment and which screws to use

I live in an apartment building that has concrete/cement walls. I am still not sure which one it is. I included the image which has the wall in the background. I would like to know which screws i ...
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Wall frame weirdness during renovations

so I am renovating my garage and noticed something in 2 spots along the frame when ripping down the drywall. Here is a photo: The walls of the garage have stood for many many years without major ...
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304 views

How do I fix sticky KILZ primer?

Has anyone ever had problems with an oil-based primer like KILZ being sticky or not drying correctly? We removed some vinyl tiles and mastic from a basement laundry room floor (concrete) using ...
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2answers
122 views

How much concrete is required to hold 125 lbs/sqft permanently?

I have an garage with asphalt floor and concrete footings. I plan to put a 500 lb safe in the corner, partially on the footing. That's about 125 lbs per square foot including contents, permanently. ...
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1answer
43 views

What should I do about cracks in the cement pan for a roll-in shower?

We are installing a roll-in shower. We poured the floor and after 2 days it has several cracks in it. I am not sure if they are all the way through. Is there any way to fix this or do we have to ...
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1answer
4k views

How do I reduce height of the curb on my driveway?

I have a concrete driveway (normal 2 car poured driveway) which is cut vertically (90 degrees) about 2.5 inches above the street. My father-in-law lives with us and has a powered wheelchair. The ...
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2answers
40 views

How long will stored powder charges last?

I finished a basement well over a decade ago, and had leftover concrete nails and powder charges for my powder actuated nail gun. I'm going to be driving a few nails into concrete for a tack strip, ...
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78 views

repairing concrete damaged by anchors

I was trying to mount something to a concrete wall and completely botched it. I had 4 drop-in anchors, so I took a hammer drill and some bits that were, by eye, pretty close to the diameter of the ...
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Large gap between foundation wall and patio

What is the best way to full this gap which is between the foundation wall and front patio?
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179 views

Gutted a basement and found a window, what should I do?

I recently gutted my basement in an early 1900s home that was finished in the mid-80s, and discovered a window! This window is directly under my front door, hidden by a deck that I've never really ...
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2answers
3k views

How can I level concrete pavement for an above-ground pool?

I want to set up an above-ground pool (14' round) on my back yard. There is a relatively good place for it, where there are concrete slabs, however, there are two problems: The slabs are not level. ...
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How to mix concrete cement

How do i make sure i have the right air in concrete cement if i'm mixing at home.So that the concrete is stronger and won't crack in cold winters. I'm pouring a small walk way about a meter of ...
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2answers
4k views

Extending concrete Slab

I have a 10 x 10 slab (4 inches thick) that is already in my back yard in the corner. I bought a kit to build a 10 x 10 shed on it, and then realized that would put it right up to my fence. So my ...
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1answer
194 views

How long can a concrete pool stay without the water?

After draining the pool, how long can it stay empty. In other words, how much time do I have to work on it, before it is not safe? I heard opinions that concrete pools can't stay long without the ...
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3answers
93 views

How can I get concrete out of ground?

I had a huge play structure when the kids were little that I donated to a church camp. When they picked it up they just cut the brackets at the ground and left the concrete and 6 inch U brackets ...
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2answers
827 views

How to fix leak in ABS pipe going into cement

I discovered a leak in the drain pipe from my kitchen sink (and dishwasher) as it joins with the main drain in my basement floor. The leak is at a Y junction - the bottom of the Y is in the slab, one ...
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Repairing/patching concrete foundation of house

What's the best (or maybe easiest and most affordable would be more accurate) route to patch the concrete of our house foundation? It's kind of crumbling in places and needs a facelift. Ideas/options? ...
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10k views

Why do builders say that wet concrete/mortar is not as strong?

I have been watching a few videos demonstrating the mixing of mortar and cement and a constant theme is that you must not have the mix too runny. I cannot fathom the reason... Does anyone care to ...
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How to install 4'x9' fiber concrete siding to replace wood siding

I acquired 4x9 panels of fiber concrete siding. I want to replace 20 year old 4x9 sheets of wood siding. I read you need good backing under the concrete panels. What is the best practice for ...