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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62 views

Remove rotten mail post

I have to remove the rotten mail post and install a new one. The post was broken. I have to take it out first. The difficult thing is that the concrete around the post root. It's deep and hard. I ...
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How to Fill Gap Between Steel Beam and Concrete Pillar?

I have a Concrete Foundation Pillar that is 5/8th of an inch too short. What filler materials are appropriate when a steel I Beam will be resting on it? Can I use mortar, or is steel more appropriate?
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tools and material to seal and shape concrete rooftop lip?

How can I seal the concrete lip in this building's rooftop? This lip is about 5" wide, and I need to seal it. At the same time, it needs to be even with the rest (ie.it needs to look "square" ). ...
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Using just cement to plug a narrow channel/hole

I know that ideal thing is to use concrete, a mix of cement and aggregate (usually sand and gravel/rocks. However I have a bag of cement that's not going to go to any use, and my aim is just to cover ...
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how to best remove concrete splash from vinyl siding

When our contractor poured the concrete for sidewalks and handicap ramp, concrete splashed onto the vinyl siding. Is there a product or way to remove this more easily than hand-scrubbing? Pressure ...
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Materials for building inexpensive light-weight large planter?

I've wanted to build a few large planters for a while now, and I've considered using concrete, wood, etc. I don't know what other cheap material to use. Initially, I wanted to make them out of pre-...
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Is it okay to build a fire pit with concrete?

I want to put a small fire pit (3ft x 3ft) into backyard. I checked the stone options at home depot & lowes and just the material will cost around $250. I was thinking about building a mold and ...
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1answer
79 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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100 views

Distance between edge of concrete for anchor bolts?

In residential construction, placing anchor (j bolts) for the sill plate, I have always read that it's best to stay towards the outside edge of the foundation and face the J portion towards the ...
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155 views

How can I repair the degraded surface of a concrete slab and wall?

I've never worked with concrete. Is there an easy way for a concrete newbie to repair this wall? OR- How do I fix it? Here is another view, further back. =================== Found these in a ...
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Mounting 2'x3' Glass whiteboard, drywall over concrete

I am trying to mount a 2'x3' glass whiteboard that weighs ~14lbs to the wall in a new condo. Best I can tell, there is a concrete barrier very close to the surface drywall, and it isn't giving me ...
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How can I paint concrete pavers with scenes?

I was given some concrete pavers that have scenes molded in them. I would like to paint them so that the details in each block can be seen. One is of an eagle and another is the American Flag. How do ...
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What kind of garage flooring is this?

I like the flooring here in this picture but wonder what it is Is it some paint / stain on top of concrete? Because I can see the crack. Or is it some laminate plastic thing?
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Sand and refinish uneven concrete

My patio concrete shows multiple pieces put together in the past I am thinking of renting a concrete grinder 10” and make it even. Then either paint or put something on top to cover. I may fill the ...
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60 views

How I prep a concrete garage floor for painting?

Is there any special considerations for painting a concrete garage floor as opposed to any other concrete surface? I'm thinking in terms of foot and tire traffic.
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How long should it take concrete to fully cure?

I have just had a backflow valve installed in the basement. The man had to chip away some of the concrete, he then put new cement down. He also had to do some work outside around the foundation, he ...
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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 can I put in a screw in a concrete ceiling without power tools?

I want to hang my plant but my ceiling is concrete. I don't have a drill. I have a hammer and screwdriver.
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tub overfowed, didn't realize floor and pad are wet. pulled up thought was dry. when i cover with pad and carpet gets wet

I have been drying with space heater and dehumidifier,. however if i put carpet back it gets saturated. I am drying for several days, then cover with carpet, after 5 days carpet is dripping wet again....
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Will a PVC pipe crack in concrete?

If a plastic PVC pipe is totally covered with cement? Does a minor crack/s in the concrete will also crack PVC pipe or damage it? I mean cracks such as due to very minor seismic movements?
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Laying Stone on a unlevel concrete surface

first and foremost thanks for the help :) I am in the process of redoing my porch and I have hit a road bump along the way. I am planning on laying real thick stone (as seen here) on the porch floor. ...
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Material lighter than concrete for planters?

I'm trying to build several 24"x 24" square planters with each wall 1.5" thick, similar to the following picture. The issue is that each one of these planters will weigh at least 200 pounds (without ...
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35 views

Do these plastic molds exist?

I want to make a few concrete pavers, so I started looking for a few tutorials, and found this youtube video. In the tutorial, he uses a plastic mold where he pours the concrete. Something like this: ...
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How can I pour a concrete pad with a circular hole in it?

Essentially, I'd like to put down a concrete pad for a patio, but leave a couple of circular areas within that patio unpaved (for planting shrubs). I'm familiar with the techniques for using ...
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Screw doesn't grip

I have just purchased 3/16 x 2-3/4" philips head tapcons and the recommended 5/32" drill bit. I drilled the holes using hammer-drill with ease and plenty deep as recommended. Attempting to drive the ...
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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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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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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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97 views

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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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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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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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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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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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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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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303 views

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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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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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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59 views

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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106 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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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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107 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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265 views

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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743 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 ...