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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Moist sandy gravel between frost-proof monolithic slab and insulation. Is it going to freeze and expand?

I’m planning on pouring a monolithic slab with insulation beneath to prevent frost heave of the ground below. It’s a somewhat common technique, there’s just not many folks I can find in Massachusetts ...
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Is there a purpose for the concrete border at base of this house?

My wife and I are in negotiations to purchase a house that is located in the Southeastern US. The home inspector was a bit baffled by the concrete border (first image) that runs along the back and ...
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41 views

Driveway conversion to dog play area

I have a concrete driveway in mediocre condition (square slabs that are of varying conditions--some small cracks) that is on the side of the house which is narrow enough that it is not very functional ...
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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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67 views

Concrete driveway cured too soon and surface cement washed away

I had someone pour a concrete driveway for me. About 6 hours after it was poured it felt like it had solidified and was now only a little damp so I wanted to start curing it. I used a hose to spray ...
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874 views

What is an appropriate sealer for a Papercrete bench?

I've built a bench out of tires and papercrete two years ago. i've sealed it with lime plaster. in the past two years it held up against 500 m"m of rain in the winter and Mediterranean sun 7 month ...
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99 views

Concrete Steps Moving Away From House

I recently noticed that the steps on my front door appear to be moving away from my house. The gap is large enough that some small critters appear to be getting in the gap to setup a nice home for ...
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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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177 views

How should I fill in pits in a concrete floor so I can install laminate?

I have these holes in the concrete floor, and I want to install laminate floor. What can I do to fill in these holes to get a nice level surface.
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207 views

This hole in a concrete porch needs fixing

I might buy this house and have never lived there. The porch has an big air space of maybe 4 feet underneath the slab. Some of the rebar at the bottom edge of the slab is visible when peering in. The ...
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45 views

Fixing Incorrect Concrete Application

I have a 400 Square Foot garage that has a lot of gouges in the concrete floor. I purchased some primer and Concrete Leveler in order to fix the gouges. I made a mistake and accidently mixed 4 times ...
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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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Can I float a tongue-and-grooved 1x12 pine floor over a concrete slab on grade?

I have bare concrete floor that was, until recently, covered with carpet. After recently seeing a friend of mine purchase raw pine, shape the tongue-and-groove himself, and seal it to achieve a ...
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140 views

Stem wall forming questions

I'm getting ready to build a new detached garage - excavator coming this weekend! After getting a few bids, I've decided I'm going to pour the footer & stem wall myself, and contract the ...
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47 views

Concrete Slab touching siding and accumulating moisture

In my house there is a concrete patio which is touching siding and foundation. Since the grade of the patio is not correct near the place it touches the siding water puddles in it after rain. I am ...
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189 views

How do I seal the cracks between my asphalt driveway and my garage concrete slab?

I am not sure if this is an aesthetic problem or not. I suspect that if I do not fix the damage properly the water will continue to infiltrate the cracks and it will create larger problems in the ...
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1k views

How to put up a very small barrier on concrete to stop water running past it

I have a concrete driveway that leads to the garage, with a very slight slope towards the garage. When it really rains hard, the water comes down into the garage. I don't want a very high barrier, ...
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26 views

Proper method to seal a heated crawl space

I have a heated crawlspace with a dirt floor. There are no vents, it is fully connected to the house, and currently has a pool liner and vapour barrier stretched over it, but it is not sealed. There ...
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2answers
159 views

Maximum height of hand-shaped concrete curb?

I need to guide water flow at the end of my driveway (see this question). My plan is to put in a concrete curb or hump to guide the water. I've gone all over the map in thinking of how to build it, ...
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Pouring a concrete slab against my house: how to frame it up against the outside wall?

I have a concrete front stoop that drains some water into the basement, so I am going to knock it out and pour a new slab with better grading. The slab will be about 4 feet square, and fits into a ...
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236 views

White stuff coming out of my wall when dry

We painted my wall two times already first was a dark blue and some white powdery stuff was spreading after the paint dried, now we painted it again now in purple and it still has the white stuff when ...
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73 views

Cracks in basement cement just poured

I saw this in my wall that was just poured. Contractor says its not a problem, I think it is.
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170 views

Can I use mortar to roughly level a basement floor for workshop?

I recently got my foundation repaired and am left with a very cracked and uneven concrete floor next to the wall. Along the very edge any leveling compound would be at least an inch deep. All I plan ...
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114 views

Cracks in a newly constrcuted basement wall?

Pic 1 shows the newly constructed basement (Just 4 days) wall and It can clearly seen the crack across the wall (Not sure whether its crack or not but looks like) due to pouring concrete. I wonder ...
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75 views

Can cured concrete be re-colored?

The well cured concrete stamped driveway was lightly rained on one morning. I was late for work and proceeded to spin the tires. Later I saw the repercussions of my haste. The spinning tire left a ...
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629 views

What type of subfloor should be used for Engineered hardwood flooring installed on grade concrete slab?

I would like to install engineered hardwood flooring over a concrete slab which is on grade. It is the first floor of the house, there is no basement and the house was built in the 1990's. I have seen ...
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517 views

How to repair / reinforce deteriorated footings and subsoil below brick & concrete porch

My fiancee and I recently moved into a 1922 brick craftsman-style home. The front porch has a ~4" poured concrete floor and large solid concrete railing caps (12"W x 4"D). Brick columns support the ...
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74 views

How do I patch a hole in concrete sidewalk over open tunnel?

There is a sidewalk running over an old tunnel. It's near a grade school, and is used often by faculty and students. The tunnel is completely open, but blocked at both ends so there is no access ...
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325 views

Repainting my lanai floor

I'm painting my lanai floor and it has been painted last year but changing the color. Did one area and let it dry 24hr. and I can scratch it off/ I used the paint Home Depot sold me for concrete. What ...
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55 views

Reinforcing a boulder/concrete wall

Our fixer-upper has a freestanding wall outside, that is built of melon-sized boulders cemented together. The back side was left rough, and we're starting to get cracks (I patched with cement-all). So ...
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189 views

Laying Vinyl Flooring Over Uneven Poured Concrete

I am trying to give my basement floor an update, and I have purchased a click and lock vinyl floating floor. The existing poured concrete has some raised areas (where the concrete was clumpy and not ...
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3answers
650 views

What is the easiest way to cut a 2 inch groove in concrete?

I have a 5 foot wide concrete side-walk running next to my house. I want to cut a 2 inch groove from the wall to the yard in order to run a PVC irrigation pipe from the faucet on the wall to the ...
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74 views

How to fix concrete cracks with weed growing out?

I have cracks on my concrete stairs that have weeds growing out of. I was wondering what the (caulking-like?) product is to fill the cracks. Should I spray some sort of herbicide to supress growth ...
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319 views

How does a snowblower perform on exposed aggregate concrete?

I wish to replace my asphalt driveway with concrete. I am hoping to do something a little more visually interesting than just a slab, though. I like the look of exposed aggregate, but I am concerned ...
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How do I get rust stains off my driveway?

I used fertilizer with iron and, unfortunately, didn't sweep adequately afterwards. Afterwards I ran my sprinklers and now my driveway and sidewalk are peppered with unsightly rust stains. What are ...
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97 views

how to make a half circle tunnel through a cement slab?

There is a slab of concrete in my backyard, and I need to make a half circle cut out in it like this picture below. This is for a 3" pipe to sit in. How would I go about doing this?
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How can I prepare uneven concrete basement floor for vinyl planks?

I have roughly 600 sq ft of basement that needs new flooring after some unfortunate flooding this past summer. We had carpet over concrete and are now looking to lay vinyl planks down. There is about ...
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Unsure if structure is solid concrete

My home was built in 1957. It has a 10x10 3foot high brick patio with a concrete slab on top. We are replacing the deck which is much bigger. The deck on the slab rotted due to water pooling in a ...
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Is what I have done suitable?

I put down onto a concrete floor, 5mm plywood, 4' x 6' strips then placed 9mm OSB Boards, 6' x 4'. Will this be acceptable before putting down carpet or?
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147 views

How can I refinish a basement concrete floor?

The basement concrete floor pictured has traces of red paint, a beige mesh, the concrete itself, and a top blue-gray layer of paint. Does refinishing the floor require reapplying the red and the ...
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2answers
5k views

Stabilizing a gravel driveway with massive holes and steep inclination

I have inherited a 270 feet long driveway along a steep hill. It is part gravel/stone, and part concrete. It is in very bad condition. Every winter, rain threatens to wash away parts of it. Driving ...
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Is this cracking foundation under a jack post a problem that requires repair?

I am buying an already-built new home. I find this in the basement. The builder says it's okay, but I am really concerned. Is this really a big issue? What steps would be required to repair it? This ...
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4answers
900 views

How can I stop mortar plugs from popping out of slab holes?

Our termite people plugged their dozens of chemical insertion holes using a regular grout and a putty knife. Needless to say the plugs are popping out left and right. (They tell me that is normal, ...
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ingredients used to make concrete textured walls

Ive recently built a dozen or so large boulders that are now used as landscaping around my pool. In learning how and what to mix {you tube}, I seen other how too videos about refacing a block wall ...
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92 views

Rebar Spacing in a concrete footer

I have some rotting timber retaining walls that were built between boulders. I want to replace them by pouring concrete footers and stacking CMU blocks. I also want to add some rebar to help ...
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Monolithic frost proof shallow foundation, advice on the smaller details?

I'm building a 16x24 shed/garage. I have done most of the site work and I have a concrete guy starting tomorrow on the forms in preparation for a pour on Friday. He's done insulated slabs, he has 30 ...
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3answers
15k views

What cement product should I use to fix a hole in my slab?

I was removing old thinset and self-leveling cement in an area in preparation to tile it when the 6" chisel and demo hammer I was using sunk in to a specific spot. I found that this specific spot had ...
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132 views

What type of contractor would I hire to level a concrete floor?

I am doing some renovations, and I've recently uncovered an original concrete floor that I would like to have leveled for carpet to be installed. It's currently sloped from level with the adjoining ...
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2answers
1k views

Installing subfloor and hardwood on top of concrete (2nd story)

I bought a condo in a triplex where I have all of the 2nd floor. Most rooms are on hardwood, while the rest is on laminate with a serious height difference of an inch and a half (hardwood being ...
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2k views

Pure concrete hollow cylinder

My intention is to build a hollow concrete cylinder for a fire pit like this: There are a few people who have done this by using steel sheets bent in to shape with supports between, but I would ...