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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11 views

How do I cover holes in a structural RC slab

This question needs a little backstory. With the help of a concrete expert, we poured a 210mm thick reinforced concrete slab on top of a basement. The slab acts as the roof of the basement and floor ...
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50 views

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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90 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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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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36 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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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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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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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 much concrete would I pour to install a 35' light pole? [duplicate]

I have a 35 foot aluminum light pole that has 4 bolts holes in the base of the pole. I need to know how deep and wide should I pour the concrete into the ground. I'm not going to use the light pole ...
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66 views

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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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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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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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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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 ...
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Asphalt Impregnated Board as Isolation Joint

I am extending a concrete patio in my backyard and have decided to connect the new slab to the existing slab, but I am using asphalt impregnated boards to form an isolation joint between the new slab ...
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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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How to extend a concrete patio

I am trying to extend my back patio like this Eventually, I want to extend the full 18 feet, but for now I am planning to just do the 5 feet by 5.5 feet section in blue. This section will be attached ...
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Grout and/or thinset flushed in septic system

All. My contractor is awful. If we weren't almost done with the project, I would kick him off my property and sue him. Anyway, it appears that he dumped excess thinset or grout into my basement ...
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Is it a problem to leave a sprinkler line through concrete shed footing?

I'm in the process of getting an attached shed built in my house (due to HOA restrictions). They seem to be very competent. The contractor is subcontracting the concrete foundation pouring. They have ...
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66 views

How to repair thin concrete deck cover

I recently bought a house with a deck that has what appears to be a thin layer of concrete over wire mesh over wooden (2x6 or similar) beams. A friend mentioned that he figures the concrete was not ...
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70 views

Would a concrete ramp added to an existing slab be less durable?

To remediate a situation my concrete company caused by changing the layout without consulting me, they propose to add a ramp partially on an existing (though new ~10 days) slab. I'm worried that it ...
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What product should I use to reseal an aggregate patio?

The surface was never really "smooth", but metal patio furniture with plastic gliders on its feet used to move easily across it. Now, the surface is rougher and pebbles are loose and get washed or ...
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Bury a Retaining Wall

We are building a gunite pool (roughly 20’x40’) on a sloped yard. It appears we will need a 70’x6’ retaining wall for our slope. One person that builds retaining walls suggested building the wall one ...
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How long will a concrete bore plug take to cure?

I have sealed an old abandon deep boring which was 220 feet long. First I poured small stone chips up to 7 feet and poured liquid cement mixed with Dr fixit up to 220 feet. My boring had PVC cashing ...
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How cut 4“ wide, 2” deep hole in concrete floor

I'm looking for advice on how to efficiently cut a rough hole about 4" diameter and 2" deep in a concrete floor. My tools are: a new 4.5" angle grinder with a diamond-cup grinding wheel and a diamond ...
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Laminate flooring on three seasons porch issue

Hello, I just pulled up the carpet in my three seasons porch to put in laminate flooring. The wall against the house has a strip of wood coming out from under the wall panels the width of the wall. It ...
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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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What happens to foam insulation board after you pour concrete slab?

I plan on making a garage out of a large carport, and I've watched and I understood how to properly insulate a new concrete slab. 4 inches of gravel, vapor barrier, 2 inch foam board, 2 inches of sand ...
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Iron bar set in concrete heavily corroded; how to mitigate?

I have a decorative concrete column (solid concrete with rebar) in front of a multi-storey house, about 10m hight. Said column is held by three thick steel bars (6 x 2 cm) that link it to the house, ...
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Hairline crack in concrete driveway

Should I do anything about this? The crack is about 1/16 inch and four or five feet long and first appeared mid-winter. The driveway was poured just over a year before the crack appeared. I've heard ...
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57 views

Is there any way to remove hydraulic cement from a concrete slab without ruining the concrete?

So the previous owners of my house put hydraulic cement along the edges of the wall in the garage and it looks pretty ugly. Is there any way to remove it? I've seen these Portland Cement dissolving ...
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106 views

How long to let a concrete walkway cure

I poured a concrete walkway in my back yard three days ago, and I've kept it wet, under plastic since then. Today, I removed the forms, packed sand around the edges (because I had a pile laying around,...
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Sealing leaking cracks in concrete lanai roof that is also an upstairs balcony

First, I want to apologize for the length of this. I like to think I'm a reasonably competent DIYer but this one may be out of my wheelhouse. (and I'm not even sure what type of contractor I'd call ...
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Cement over concrete too smooth surface

I let concrete set too much and tried adding water to smooth. It’s wrecked. Can I pour bagged cement over to fix it. Forms are still in place and it’s just for lawn chairs and people
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Water coming through detached garage concrete floor

We have a detached 1954 garage on a concrete slab. The slab is cracked in many places and we get water in it during a heavy rain. Or, during this rainy spring, there's almost always water in it. As it ...
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Hanging a ceiling lamp from reinforced concrete; what tool do I need to avoid rebar?

I'm trying to hang a ceiling lamp from what appears to be a reinforced concrete ceiling. My anchors require a 40 mm deep hole, but I don't succeed in drilling more than about 35 mm deep with my ...
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32 views

How to repair porch slab that has bricks embedded inside it

I have a cracked front porch slab at the front corners where it supports two decorative columns that support a small roof covering the entry door. I discovered that the pillars are on a stack of ...
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1answer
70 views

Temporarily moving 2 walls off of a slab

The very quick backstory is that in order to remain grandfathered to retain my current setbacks (i.e., too close to property line and alley), I must retain those 2 original walls of my garage. I ...
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Concrete floor surface finishing

My company recently moved into an office, that has an attached warehouse. The warehouse used to be a paint booth, so there is layers and layers of paint and gunk on the floor. It also has a lot of ...
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51 views

I have a gap in my concrete window sill, what do I fill it with

What is the correct product to fill this joint with? If I should use a cement based product I do have a can of water plug which I'd rather use than buy a 60 pound bag of something else.
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116 views

Demolishing large concrete patio slabs

My new (1950s) house has large -- e.g., one is 3.5 feet by 8.5 feet by 5 inches -- concrete slabs in our back yard. I'd like to remove them but don't know which tool(s) to use. Could this be done ...
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104 views

Single pole switch with lighting “zones”?

Somewhat of a challenge... I'm going from a single light to recessed lighting in my studio condo. There is a single pole switch that this single light is currently connected to. I'm going to install ...
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How to clean cement smear from concrete?

During a walkway pour some concrete residue smeared on the existing landing pad and entrance (both old concrete) causing a dirty appearance. Is there a way of cleaning a smear of concrete from old ...
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1answer
126 views

How to pour concrete for curved walkway to prevent cracking?

The front edge of my home slab is about 37 feet from the street. There is a 12*4 feet landing pad next to street and a 7*4 area next to front door. Originally there was a 33*4 rectangular walkway ...
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Foundation next to salt water, on bedrock

I have a cabin next to the salt water and want to build an 8' x 8' extension. The water is 16' away from the cabin at high tide. The cabin is actually on a Tickle that leads out to the ocean...well ...
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108 views

Masonry drill bits

I have used 2 different brand of masonry bits. I can not even drill one hole before it becomes dull. I used both a regular drill and a hammer drill. Is that normal? Andy
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Can faded stamped concrete be stained to match rest of patio?

Stamped concrete patio has severely faded - assume from sun and water runoff from canopy? Rest of patio and back steps looks great.It has been sealed several times over the years. How do we restore ...
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Domed concrete floor (garage) needs leveling

I am about to replace a 14ft wide garage door. The concrete floor is domed in the centre of the doors width. The mid section of floor is roughly level for about 6 feet wide but falls away each side ...