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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38 views

What is this material between our concrete and bricks (lining our pool)?

The material lines our pool between the brick (edge) and the concrete. This material is only near our pool. It feels rubbery and bendable. And The material is over 30 years old is has been breaking ...
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Rebar required for 24 ft tall 4x4 square steel tube 1/4 inch thickness, 4ft deep in a concrete base, horizontal load of up to 1,000 lbs at the top

I am installing a 24 ft 4x4 square quarter inch thick steel tube 4 ft into the ground with a concrete base of 28 inch diameter and just over 48 inches deep, so 20 ft of the post is above the ground. ...
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198 views

Is there a way to remove a root from under a walkway to bring it back to level without getting the walkway redone?

I had a disaster of a huge river birch tree in front of my house when I purchased it a year ago. I had it removed about five months ago, and the roots that ran through the yard were ground out along ...
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What is the best proportion mix cement, sand and aggregate to use in mosaics?

I am pouring mosaic concrete stepping stones to be placed in a city sidewalk. The mosaic will go face down into a form and the concrete poured from the back. I have been having problems with my test ...
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4answers
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How to bind pebbles in-between pavers?

I have roughly 700 square feet of pebbles and pavers in my back yard, and the issue I'm having is that when I step on the pebbles, they move all over the place. I'd like to apply some kind of binding ...
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Lard as release agent?

So I’m learning how to make concrete pavers with this youtube video. He mentions that he uses lard as a release agent, so he brushes that into the mold. He also suggests cooking oil or motor oil for ...
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1answer
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Repair driveway expansion joint sealant during winter?

We moved into a new construction home this part March. At our first warranty walkthrough, our builder told us that because we were a north facing home, we would have to seal our expansion joint where ...
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1answer
63 views

What is the correct tool/method for digging out existing concrete holes for fence posts

My garden needs a new fence as well as two new fence posts. There is an existing concrete base along the boundary which is already securing three posts and has holes where two posts snapped in the ...
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1answer
128 views

Leak with Drywall and Wood Framing

I've got, potentially, a silly question. We're having some work done in our basement, including the addition of a bathroom. The guys working here were working on the main to install the up-flush ...
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1answer
1k views

Can I use dry concrete mix to set a post in saturated soil?

How dry does the ground need to be in order to use postcret? I'm in norcal and we've had tons of rain. The ground is real saturated at 1 1/2 to 2ft.
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How to repair a hole in exterior concrete foundation

We have had this hole in our exterior foundation for a few years. The way we discovered it was that water was leaking into our basement finished room, and when I looked outside, I discovered this hole ...
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Repointing stone basement

I am looking into which cement to use to repoint our old house (built ~1900) stone basement. I found conflicting advice, some suggesting type N or type S is fine, but some sources suggest that ...
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3answers
385 views

Should a concrete curb at a patio door be built on top of or inset into the slab?

This is going to be hard to explain, so please bear with me. I am shrinking down an old 8' sliding glass door Rough opening from what appears to have been an old garage door originally. The header ...
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Approaches to level a concrete floor with shallow pipes

I have a situation very similar to How to level a section of raised concrete floor?. Except, in my case the obvious solution of grinding the high point is not possible. In my hallway I have a raised ...
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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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Crawlspace Post to beam lumber grade

Recently we replaced some of the rotten and cracked true size 4 in x 6 in. posts under the house in crawlspace. The old posts were resting on concrete pads 24 in. x 24 in. and supporting a true size ...
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506 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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above ground pole support for sail cloth

I need to create above ground, mobile "footings" for metal poles to hold sail cloth. I was thinking of a cardboard tubing, filled with concrete to hold a sleeve to insert the pole into that will hold ...
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1answer
54 views

How can I remove paint splatters from sealed decorative concrete deck?

I have a custom concrete pation & pool deck that is textured / painted to look like wood. It is also sealed. Recently I had the coping on my pool fixed and the guy did a great job but left quite a ...
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33 views

Are phosphate floor screws suitable for subfloor which will be covered in thinset and cement board?

I am installing hardiebacker concrete board with thinset to a plywood subfloor. I am putting down the new subfloor and want to be sure the screws that I use to secure the plywood to the joists will ...
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7answers
52k 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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3answers
35 views

How would I remove a concrete shelf with possible reinforcements

I've had a brick-walled cupboard removed from my kitchen, but the concrete shelf that was in it had to be left because of the gas piping around it. The piping will be removed for 2 days soon while a ...
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325 views

Concrete stairs substrate preparation and layering

I need to pour small stair entry into my basement, about 4 steps and it is narrow, with a brick retention wall on both sides. I was going to first evenly grade and pack the dirt, then put gravel, ...
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How to hang a projector screen from a thin horizontal part of slightly curved ceiling

I have a brick wall in front of which I want to hang a projector screen. Here is an image of a typical projector screen that I am looking to buy: The part of my ceiling near the wall is curved(the ...
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1answer
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Raised Concrete patio construction

I'm concerned about the way my raised concrete patio is being constructed and thought I'd do a sanity check here. 14x16 raised screened in porch. Footers, concrete block and brick foundation with ...
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3answers
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How do I calculate the concrete needed for a fence post?

I'm trying to determine how much concrete I'll need to set fence posts for a 6ft tall privacy fence. From what I've read these are the parameters I'll be using for each post hole. Post: 4in x 4in x ...
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111 views

How do I build a fence with zero experience?

I've never built a fence or have never done any outdoor construction. I'm pretty handy and do most of my interior maintenance. I have a total of 780 feet where I need to put up a fence. I'm still ...
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12k views

How to run electrical wire in concrete ceilng?

I live in a condo with popcorn (a.k.a California) ceilings. Next week I'm having them scraped, spackled, and painted smooth. I also want to hang a ceiling light fixture (the dining area desperately ...
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1answer
116 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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Can the vapor barrier between a dry floating concrete slab and linoleum flooring be foregone?

I have a two year old house that sits on an 8" concrete floating slab. The slab is insulated below and around the side. The floors in the house are unfinished. That is, the concrete slab is ...
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1answer
37 views

Diameter of an 11' foot high, 3" (2&7/8) steel post footer hole

I know that the general standard for post footers is to make the diameter of the footer hole 3 times wider than the post itself. However, I want to make sure that even in an 11' foot post (which seems ...
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3answers
100 views

How much water for mixing with concrete?

I bought a bag of quikrete mason mix for creating some planters from molds. The wood panel molds look something like this, but the spacing is a bit narrower and they're smaller: Since I'll be pouring ...
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Wire mesh or rebar

I am extending my back patio and am planning on reinforcing the new slab. I live in South Louisiana. Should I use wire mesh or rebar for this?
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Can I use concrete screws to mount storage racks through drywall into wall studs?

I mistakenly brought concrete screws to hang my storage racks in the garage. Well, turns out my walls are drywall on wood, and not concrete. I don't supposed the concrete screws will work in drywall ...
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94 views

How can I raise a concrete bridge footing two inches?

I have two existing concrete footers from the previous bridge that are not leveled. I thought about using hydraulic cement to level the top of it. The left side needs to be about 2 inches higher ...
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5answers
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What to use so concrete doesn't stick to plastic bucket?

I'll be using regular plastic buckets to make some concrete planters, something like this. My goal is to reuse the buckets. The problem is that she sprayed each bucket (generously) with canola oil ...
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6answers
544 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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How serious is this spalling?

Spalling is occurring on the corner of the top of the first story. I'm curious as to how serious this is.
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Extend/splice 12/2 romex along concrete finished wall

I would like to extend some wiring for a counter outlet that is running behind a refrigerator, which currently encased in a metal "cable concealer" raceway. Note: wiring is in a raceway because most ...
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Tile uneven fireplace hearth concrete

I remodel my fireplace and the hearth was poured concrete over: I plan to install tiles over the 3 sides However the surface is not even and not 90 degree You can see the bumps from previous ...
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What to use as a screed edge along a brick wall?

I'm planning to pour a concrete slab along a brick wall and need to plan how I will screed it smooth. Three sides of the rectangular slab will have a removable wooden form, but the fourth side is ...
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How to patch concrete as invisibly as possibe?

I had a plumbing repair done this week that required them to jackhammer a small hole through a concrete porch in front of my house. It is small enough that I’ll probably attempt the patch myself, but ...
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1answer
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Need More Water in Quikrete than Recommended

I am pouring a series of concrete slabs for a patio and I’m using standard 80lb Quikrete bags (https://www.homedepot.com/p/100318511). The directions recommend 3qts of water per bag and a max of 4....
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What should be used between a concrete tub and wall tile?

I have an older home that has a large, decorative concrete bathtub/shower with tiled enclosure walls. The walls behind the tile and tub are poured concrete. (Yes, the house is very sturdily built.) ...
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3answers
745 views

Can I add cement glue and sand into my concrete mix to repair my cenent garden statue?

I have a leopard concrete garden statue that was given to me by my neighbor that has a broken foot and log. I want to repair it and paint it. It also has been weather eroded so I need to recover it as ...
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1answer
50 views

Pipework after concrete slab is poured

I'm planning to build a 10x8 shed that will house the pipework and electrical equipment for a new well I recently had drilled. I would like the shed to sit on a concrete slab just for the quality of ...
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1answer
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How wide does a 6x6 concrete post footing needs to be?

Need to attach 6x6x8 posts for a free-standing pergola - I'll use Strong-Tie anchors attached to the concrete footing. The hole for the footing will reach well below the freezing line, but how wide ...
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1answer
252 views

How can I remove a Carpet from concrete stuck down with black mastic/bitumen

I'm currently on restoring a property in the UK. The house was originally a Care Home built in 1987, and was built using standard commercial techniques at the time. The issue I'm having is, at the ...
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about preparing concrete slab for leveling

I am preparing concrete slab surface for leveling it. I removed the tiles first, and grinded away the remaining thinset mostly nearby the boundary of tiles. Here is the picture of the current ...
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Reducing moisture from semi-finished basement concrete floor

I'm looking for advice for a good way to reduce moisture seepage through my basement concrete floor. My research has turned up several promising approaches: Surface-only treatments Specialty paints ...