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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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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67 views

Bathtub Drain Leak near Concrete

After recently moving into a home (built in the mid 90's and apparently went through a remodel at some point), the guest bathroom tub started leaking. I noticed the leak in the room on the opposite ...
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136 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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46 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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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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182 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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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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235 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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72 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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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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502 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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627 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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90 views

Making sense of an existing sump system

I just bought my first house, but I can't seem to understand how the sump worked. I'd like to make sure it's hooked up and ready to go should the basement ever flood. When I first walked in, the ...
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73 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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54 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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2answers
318 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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94 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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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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218 views

how much weight a specific sized concrete slab can carry?

Say I have a portion of 10x10 feets. I need to put a concrete slab for that. The thickness of the slab will go 4 inches. Is there a way to tell, how much weight this slab can carry?
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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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49 views

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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190 views

How wide does a 6x6 concrete post footing need to be using an elevated post base anchor?

I'm building a pergola over a paver patio. The pergola will dimension 11'x 11.5' on center of post with 6x6 posts (4 posts), tied together with sandwiched 2x12 beams. I've laid out footer locations ...
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2answers
188 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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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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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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60 views

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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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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36 views

Fixing foundation crack with repair kits

I have a crack in the foundation visible on both sides, interior and exterior on an older home (built in 60's). In my case the foundation does not seem to be sagging. I have received some advice ...
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35 views

How do you refinish a concrete countertop?

I have concrete countertops in my kitchen that, unfortunately, weren't sealed properly. They quickly began picking up stains from water, so the contractor that made them took them back and somehow ...
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1answer
95 views

How to minimise the amount of concrete needed for a shed foundation?

I’m looking to build a 6m by 3m shed in the back garden. It will be jammed in between 3 neighbours’ gardens, so it will have to be less than 2.5m high. Roof will most likely be a low grade pitch with ...
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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 ...
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272 views

Please reassure me about basement french drains

I understand the principles and practice of putting in a basement perimeter drain... but I've got a slightly irrational paranoia about the concept of cutting the basement floor free that way. ...
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40 views

Kerb concrete slab

I'm thinking of using some kerbing to retain a small mound of earth from falling onto a new concrete slab drive. But I'm not sure whether to add the kerb before or after laying the concrete slab. If ...
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85 views

why is there a concrete pole in my wall?

I broke open a section of wall I'd like to remove and there is a concrete pole inside!? Is this some kind of load bearing device? How can I know if I can remove it? Thanks
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How to seal joint between stone foundation wall and conrete cellar floor

In my 1910 vintage Baltimore row house, the concrete cellar floor was laid after the construction of the house. The joint between the irregular surface of the stone foundation wall and the concrete ...
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5answers
205 views

Can a regular rasp be used to enlarge a hole in concrete?

I need to enlarge a few holes from 40mm to 50mm in a cinder block wall and in a concrete beam. Chiseling will do much damage and need patching, can I rasp it with a wood rasp?
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What primer should we use on a previously painted concrete wall?

We are preparing to prime and paint over previously painted interior concrete walls. The walls have oil residue (from an oil furnace) that is embedded in the rough surface and we were unable to fully ...
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203 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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51 views

Can I expand a concrete slab by 3/4"?

I have an above ground exterior concrete slab that we'd like to surface with 2" x 2" porcelain tiles. The slab is just a little too small – about 3/4" in one dimension. I'm wondering if it would work ...
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How do I finish a concrete floorÉ

My basement has a concrete floor that is all jagged. It`s missing about 1 1/2 inches of concrete to be even with everything else....what do I do?? Will self-leveling cement adhere to such a ...
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379 views

How to get water to hop from patio over brick wall?

I have a concrete patio elevated a few feet above the lawn. The patio is bordered by a brick wall (on 3 sides, with the house on the 4th) that extends higher than the top of the concrete of the patio ...
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317 views

How to fix a sewer pipe leak in a prefab concrete floor

My house is built with prefab concrete slabs for walls and floors. These have been prefabricated with most of the plumbing and electricity tubes pre- installed inside the concrete. While redoing the ...
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2answers
138 views

What's the proper way to fill this hole?

Recently a dip formed in our flooring inside our sports performance training facility. We discovered that the concrete job there had a good number of stones in it, and I believe that it was that ...
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124 views

How do I pour concrete in an existing garage?

My garage had extremely poor flooring. I've removed it and dug down 11". I plan to use a plate compactor on the dirt, add 4" of crushed rock, compact that, add 2" of sand, wet that, wait for it to dry ...
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944 views

Adding rebar to deck footings and piers?

I've heard a few people mention adding rebar to deck footings and piers to make them stronger, but I haven't been able to find any details on how exactly to do this. Is it sufficient to just hammer ...
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1answer
110 views

Is there a way to find rebar in concrete walls?

I was wondering if there is a way to find the tie rods and also plastic electrical conduit in concrete walls. In Ecuador all walls are made from poured concrete and plastic conduit is run. But it all ...
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766 views

How will concrete fill in?

So I am pouring some footings for a deck I am building and my current plan is to dig a hole that is 18" wide and 18" deep. I'm then going to suspend a sonotube about 6 inches above the bottom (using ...
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177 views

How long will Concrete bond together when poured over multiple days?

I've heard / read references to concrete being poured over 2+ days becoming "bonded" but I can't find any details to what the longest you can wait is. What is the longest you can wait between pours ...
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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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155 views

What timber to use for formwork or shuttering concrete base

What type of timber would you use to construct the formwork (shuttering). There seems to be 4 different types that I could use. Planed Sawn Untreated Sawn Treated Carcassing My particular ...