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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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102 views

How long before I can move a concrete lid?

I cast a concrete lid to replace the broken one on my well pit. My lid is 30"x 36", and 2-1/2" thick and reinforced with rebar. I am keeping it covered with a tarp and misting it every few hours. How ...
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36 views

Inground trashcan missing neck

I have two in ground trash cans that are missing the neck where the hinge attaches to the lid. When it rains, water gets in and fills the hole. I have a 32 gallon plastic trash can that I put in and ...
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71 views

Span between wood post for stilt cabin

I intend to build on Weiss Lake in AL. If I use 8x8 posts, can I span 10 ft with 2x10 or should it be 2x12 for the floor joists? Also was wondering for the foundation can I just sink the wood post or ...
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29 views

Which anchors to use for a wall in a basement [duplicate]

I need to extend one of the walls by approx 30 inches. I will be using pressure treaded 2x4 in bottom of the wall and wall will be about 83 inches high. Which anchors should I use to secure the ...
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500 views

How to put drywall over garage uneven concrete wall?

I would like to make my garage wall a bit "smoother". And now I think about using drywall to cover the bare concrete. However the concrete is very uneven with at least 1 inch of concrete sticking out ...
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6answers
667 views

Cut rebar in concrete

I opened up a hole in my concrete wall to pass a threaded PVC 2 inch male adapter. On the other side there is an aluminum metal sheet. The problem is that I hit rebar and can not change the position ...
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1answer
86 views

Please help! Exterior Sliding Door Leak on Interior Slab - No visible threshold - 1980 construction

I have a townhouse built on a concrete slab. Laminate flooring was installed 5 years ago, and has buckled severely at the patio door. I suspected water intrusion, cut back the laminate, and saw: The ...
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463 views

2x4’s embeded in the foundation wall

A home is going up right next door, and I noticed that the foundation walls have 2x4’s embedded in them. Won’t that cause the concrete to crack when the wood gets wet?
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98 views

Sleeve anchors not going all the way in?

I bought some 3/8" x 3" sleeve anchors for a fence i'm installing. This is very hard concrete from a building ledge; the holes cannot be drilled with a regular hammer drill. So we drilled 3" holes ...
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544 views

Need help installing the pull up bar i just bought

i am a rookie that hasnt done much installing/drilling etc. in my life (just turned 18 ;P). So i bought this pull up bar online, assembled it, but now i have to install it to my wall. At first i ...
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69 views

Removal of leftover glue from glued down 3/4 T&G flooring

In the process of removing the 3 different types of flooring in the house we just bought and before we move in get the major things out of the way. Carpet is easy enough for the most part, the house ...
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2answers
140 views

Is this normal? Cabinet/Backsplash install

We hired a contractor for our kitchen but are doing our own bathroom. The contractor installed the wall cabinets directly on concrete and the base cabinets on top of ungrouted tile. The contractor ...
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1k views

How can I color/style match concrete patch to old sidewalk? See image

As you can see, I attempted patching an old spalling concrete sidewalk with premix concrete patching product. I was very disappointed with the results. The color isn't remotely close to the existing ...
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620 views

What to use to backfill around the concrete pier block?

Given the image above: What should I use to backfill the hole around the concrete pier block? I am thinking to use one of the following: (1) Paver base (again) (2) Gravel (3) Just the dirt that I ...
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292 views

How to remove asphalt used to repair concrete

When the previous homeowners replaced the asphalt driveway, they had them fill in the missing concrete from the front edge of the garage (ranges from 1/2 inch to 3 inches into the garage. I want to ...
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2k views

Water leaking from concrete slab porch into rooms below. How do I stop the leaks?

My front porch is concrete and is above a portion of my garage, laundry room, and a basement bathroom. The house is in Zone 6b: -5 to 0 F. The rooms are not finished and I am not sure of the ...
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136 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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547 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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3answers
314 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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120 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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2answers
187 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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1answer
61 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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312 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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1answer
199 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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2answers
581 views

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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174 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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3answers
142 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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1answer
123 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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64 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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75 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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1answer
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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2answers
7k 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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2answers
861 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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3answers
486 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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458 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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1answer
219 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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2answers
831 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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319 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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1answer
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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2answers
95 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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2answers
263 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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0answers
77 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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1answer
88 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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2answers
186 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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39 views

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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2answers
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?