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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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54 views

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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27 views

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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86 views

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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4answers
77 views

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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68 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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1answer
92 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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85 views

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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104 views

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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19 views

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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1answer
51 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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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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56 views

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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147 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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423 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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28 views

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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50 views

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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147 views

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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65 views

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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1answer
46 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
72 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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1answer
51 views

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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1answer
74 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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118 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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112 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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3answers
95 views

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
138 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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43 views

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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210 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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39 views

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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28 views

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 ...
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44 views

How to deal with a small concrete patch in hardwood floor install

I am installing 3/4 inch oak throughout my first floor. The install is over the original pine, which sits directly on the joists. I put 1/4 OSB over the pine (due to a number of factors 5/8" wasn't ...
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1answer
35 views

Q: What is the safest way to clean soiled concrete for tiling in a small kitchen?

I'm planning on tiling my kitchen floor which is bare concrete. However, I did a water test on the concrete and it's soiled to the point that water beads up on the surface. The floor most likely needs ...
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1answer
152 views

Concrete sinking in front corners of attached garages

I was looking at buying a house and the concrete in the garage sunk about 2" on each front corner, leaving gaps under the garage door. I then realized that at least 5 houses on the same street had ...
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1answer
61 views

How to increase part of existing internal concrete slab by 300mm

I have a property with a 150mm (6") thick concrete slab throughout. The slab has a step down of approx 300mm / 1 ft, running the width of the house. This means the front rooms are at a higher ...
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1answer
48 views

Adding a indoor concrete ramp to existing concrete

My plan is to build a mold (by building a shallow wooden box, made to support putting a sheet of aluminum inside to create the curve) and fill it (upside down of course) with concrete to create what ...
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41 views

Level a concrete pour 11' x 14'

How best to level a concrete pour enough to finish with engineered floor planks. The new pour adjoins an existing pour on two sides and is 1/2" to 1 1/2" out of level in places. The highest ...
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388 views

Drilling in concrete and hitting something hard - what are my options?

I drilling somewhat deep holes (inch and a half) into concrete and I'm hitting something hard in two out of my four holes. I'm fairly sure it's not metal I'm hitting and I'm wondering how to proceed. ...
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1answer
220 views

How long should concrete set for a post before I perform additional work?

I'm installing a gate for a fence around the house and have set wooden posts in concrete foundations for support. I'm using Quikcrete and the bag states that I need to wait at least 24 hours before ...
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2answers
62 views

Laying bricks/blocks into a concrete slab during the pour

It is common practice to put a brick ribbon around a newly poured concrete walkway. Is it possible to put decorative designs, using bricks, in the middle of a concrete slab as it's poured? How do I ...
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Is a roofing delivery truck likely to crack my driveway slab?

I am having shingles delivered. The truck weighs 62,000 lbs, will this crack my concrete slab driveway? Also, they plan on a dump truck in the driveway to throw shingles from the roof. I am not sure ...
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108 views

Is this a drill bit for concrete?

What kind of drill bit is this? Can it be used to drill a hole in concrete? EDIT: after the accepted answer provided me with some details I found out what it is. Details here, on page 5. And the ...
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Can I paint my floor in two stages with epoxy?

We just redid our basement floor and I am considering epoxy paint (with texture flakes) for the floor. I prefer not to move everything out again for this process, so I'm considering moving everything ...