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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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129 views

Suggestions for fixing bottom of concrete step

Part of the bottom of the side of my concrete step is crumbling away and I'm looking for advice on a reasonably quick and easy fix as I'm worried critters will get in there (if they aren't already). ...
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541 views

Shade Sail post on brick/cinder block rooftop surface.

I am trying to install 4x4 wood posts to hold up a rectangular shade sail on my rooftop. The posts will be free-standing with nothing attached besides the sail. Ideally, I would be able to attach ...
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289 views

Building work on concrete in a very wet environment - natural spring

My garage area, which is currently just a concrete slab for parking cars on, has a natural spring that pops up just at ground level. The water never stops, and the concrete there is permanently wet ...
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118 views

Do I need rebar and footing for a 1'4“ tall 4” thick concrete wall?

I'm building a small concrete wall for an inground sandbox. The wall will be about 1'4" tall 4" thick and the longest 2 sides run just over 80" long, it is an L shape and the other sides are fairly ...
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174 views

Should I add a mound of concrete on top of existing concrete to direct water away from fence posts?

After living in this house 3 years, I realized that our wooden fence, built maybe 8ish years ago, wasn't done as I'd like. 1: The panels are installed too low, so the bottom of the boards are up to a ...
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58 views

deck mud vs concrete for shower base

I mix and pour a lot of concrete, your standard 3-2-1 (agg-sand-portland), and was wondering why a 5-1 deck mud mix (sand-portland) is preferable over a straight up stiff concrete mix, which to me ...
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289 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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196 views

Why would a rough in pipe be under the concrete?

I'm planning to install a three piece bathroom in the basement. We have 2.5" and 3.5" rough in pipes sticking out, while 2" pipe was fully in the concrete. I had to break the floor to see if it was ...
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plastic sheeting under monolithic concrete slab

I'm trying to figure out how to put the vapor / moisture barrier under a monolithic concrete slab. Do I just put the plastic down and drape it over the form, and then cut to ground level when done (...
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161 views

Should I cut control joints into a 10' by 12' shed slab?

I'm building a 10'x12' shed on a new concrete slab. The plans call for a 4" slab (thicker at the edge). My question is about control joints. It seems that 10'x12' is right on the edge of what should ...
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140 views

How to remove concrete slab

I have this concrete slab at the front of my house which I want to remove. The slab has 2 air brick holes in it too. These are surrounded by bricks with cement on to give a rounded look and then ...
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119 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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63 views

How can I fix sprinklers inside concrete?

I have two sprinklers that some genius installed into concrete: And second one: One of them is starting to give out. My initial thought is to: Hire somebody to run new sprinkler lines. Cut these ...
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74 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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2answers
37 views

Drilling depth for 3" anchor sleeve?

Im concrete, How deep does the hole have to be so that a 3" anchor sleeve is most effective? I'm drilling in very hard concrete, and I've drilled about 2.5" in depth. Is that good enough? They'll be ...
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79 views

Conduit for future sprinker system before sidewalk pour

Our street is getting new water mains and they've pulled up the sidewalks which will eventually be replaced. I don't have plans for a sprinker system but am thinking I can't pass up putting an empty ...
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103 views

Will a Bosch hammerdrill bit drill concrete faster than a cheap Makita bit?

I had to drill several 3/8" holes into very hard concrete. I purchased a Bosch LBH008 drill bit, but since I hadn't received it, I bought a cheaper $3.60 Makita drill bit that drills incredibly slow. ...
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6k views

Guidelines for poured concrete over corrugated metal

It seems common in some commercial construction to use corrugated steel plates to form a 'deck' surface which concrete is later poured onto. The combined steel/concrete then forms a very strong floor ...
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830 views

What anchor type should I use for mounting a pull-up bar installation into concrete?

So yesterday I got a pull up bar at a really good price. Now the only thing I got to do is to mount it to a solid concrete wall. Since a nearby shop offers only a few different anchors, I bought two ...
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436 views

How to correct burying cement board into shower pan concrete?

I made the big mistake of burying my cement board (Hardiebacker) into the concrete of my shower pan. I now understand the risks with water wicking up into my concrete boards, and causing a moisture/...
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434 views

concrete: remove chalk line stain and clean concrete residue

I hired a cut rate concrete contractor to redo my driveway because all the bigger firms were too busy. He did a decent job, but he did a couple things that I now need to fix since the chances of ...
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205 views

How to prepare for 1 3/4“ to 4” concrete overlay: rebar vs wire mesh vs fiberglass

My house currently has a 3rd car garage that I would like to convert and extend my family room. The biggest question is how to raise and level the garage floor with cement (preferably). I spoke with ...
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809 views

How much concrete is required to anchor down a gazebo? [closed]

My wife and I bought a put-it-together-yourself gazebo from a hardware/outdoor type store (think Home Depot or Big Lots type of place). It is rectangular gazebo (10'(w) x 12'(l) x 10'(h)) with a ...
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300 views

Sleepers on unlevel basement floor?

A question related to this one about projecting the costs to finish our basement. We have a poured concrete foundation. I don't think it has been sealed yet, but our yard is graded, our downspouts ...
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80 views

Create new patio door in basement by cutting concrete

My basement has about 2.5 ft of concrete along the wall. The reason is that the outside is a slope/hill and that 2.5" depth is just dirt. I like to install a patio door to my backyard 60x80 which is a ...
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1answer
37 views

How to calculate the requirements of a concrete slab?

Want to put three 40foot shipping containers on concrete slab. Presume I need to dig out and level the area, then fill with some gravel/sand? But not clear what depth of gravel and what depth of ...
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93 views

Need to Remove and Replace a Hook that is in Concrete

I have a metal hook that has been put into hole in a brick wall using concrete. I am wanting to remove it as a piece of the hook snapped off. What is the easiest way to remove this hook and replace? ...
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240 views

Can you polish a concrete pier block?

I've been searching google for awhile but can't find a straight answer (every link is about walls/floors): Can I polish (or sand to be smoother at least) a concrete pier block? I have this one from ...
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74 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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55 views

How clean does concrete floor really need to be for peel and stick flooring?

We bought an older home and found that there were two layers of peel and stick flooring in the bathroom. We removed those and this is the result of the floor after scraping and scrubbing for hours. My ...
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85 views

Laying bricks over old concrete sidewalks

I just moved into an old house. The previous homeowner had concrete slabs as the sidewalks that are in touch with the house wall. From what I know, the concrete slabs not only provide a flat solid ...
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173 views

What options do I have to seal the top of the concrete base of a galvanized steel post? Should I seal it?

As the subject line says I am looking for options to seal the top of the concrete base of a galvanized steel post? Should I seal it? Update: Here is what my posts look like and the specs https://www....
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Insulation in basement with plaster walls

I’m looking to finish my basement. I have a 1940’s cape cod with a poured concrete basement. The basement walls have a fairly thick layer of plaster to them, very rough looking. It’s and in good ...
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3k views

Can I build a concrete block wall over floor tile?

I am enclosing a tiled porch on concrete slab with a 3' short wall of concrete block, with windows above. Should concrete blocks be laid over a tile floor?
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101 views

Reinforced concrete drilling: wall plug won't fit

First-time driller here, so please bear with me! :) I was trying to afix a shelf in the wall, and started to drill the holes for its mounting brackets. The wall is reinforced concrete, and I was ...
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77 views

Grading over asphalt and concrete walkway

My house is in a small city lot, it's a 1924 Craftsman with a concrete block foundation. On the north side of our house, between the wall and a fence line, the previous owner had asphalt over the ...
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307 views

Can I add concrete from the old posts in the holes for the new posts and pour fast setting concrete on top?

I am about to install galvanized steel posts in fast setting concrete (QUickrete Fence n Post). Someone suggested that in order to save money I could break up smaller pieces the old concrete bases (I ...
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95 views

What is the correct type of anchor bolt for attaching a sill plate to a slab once the concrete is dry?

If you need to install additional anchor bolts after the concrete has cured (and thus can no longer install traditional J bolts), what is the correct type of fastener that can be installed into dry ...
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70 views

Ideas for improving old concrete patio on the river?

My parent's place in NH has this 30+ year old concrete 12x26 patio jutting out into the water. There has been some settling. Off the end of the patio the water is about 10 feet deep. So I'd like some ...
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43 views

Bases for anchoring 2" tubes?

Is there a base, similar to this simpson 4" 12-gauge ez base, that can be used to anchor a 2" steel tube/pipe? It would be exactly the same thing, but instead of a 4" square, it would be a 2" round ...
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78 views

Is my contractor guy doing a botch up job with repointing

Is my contractor guy doing a botch up job with repointing. Is it normal that it's drying out all cracked up like this and it's easy to crumble. They are only using the masonry cement type S and color ...
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38 views

Concrete cure time before laying hot asphalt beside?

Let's say I pour concrete sidewalks (6" thick, 4' x 8'), how many days should I wait to have hot asphalt laid right beside it (it would butt to the short side - 4') ? Was thinking of pouring the ...
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2answers
188 views

Manual methods to compact base for concrete?

I'm planning to pour a reinforced concrete pad and am looking for advice for how to compact the material underneath. A plate compactor would work - but can I get by without one? For instance, if I ...
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83 views

Wood rail on concrete steps

I currently have a metal step rail that is straight and spans three steps leading up to my front porch; it is the typical cheap metal railing you commonly see. It is at the end of its life, so my ...
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96 views

How much force can a concrete block fence and wood stud hold when installing a large shade sail?

I have a standard concrete block fence. I want to install a large 20 x 26 foot shade sail, or two 20 x 13 shade sails by screwing hooks into the wall, and the other end into my house via the studs. ...
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35 views

Rust-resistant 4x4 base for concrete?

I've read several reviews about this Simpson 12-Gauge E-Z Base that say that they began rusting after a few months. I wanted to use them, but they'll be used at a house next to the ocean, so I'm ...
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44 views

What Condition Can Concrete Be In And Be Recycled?

I have a basement slab that I'm going to be breaking up and sending to a recycler. Here's what I would like to avoid: The concrete being rejected at the site of recycling The concrete causing some ...
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5k views

Leveling sloped basement floor

We want to finish our (currently unfinished) 800 sqft basement. The current floor is concrete, in good condition, but slopes substantially toward a drain near the middle of the floor. I'd guess the ...
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558 views

Cement Recommendations for Fence Posts

I am planning to event a fence this summer and, given the size of ~ 250 linear feet, am looking for the cheapest option for cementing the poles. I am considering the use of metal Postmaster (...
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Is there an advantage to cutting joints in concrete rather than tooling them? [duplicate]

There were a few concrete driveways poured in my neighborhood this year. The contractor (largest in the area) took, what I always thought was, an unconventional approach to the joints. Typically, I ...