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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76 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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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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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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96 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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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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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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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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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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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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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 ...
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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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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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315 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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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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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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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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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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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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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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119 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 ...
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Do you include the concrete that squeezes out under the frame as part of the depth of the concrete driveway?

We had professional concrete contractors pour a new driveway. We asked for five inches depth. When I measured at the side of the driveway I found concrete had squeezed out under the frame. Do you ...
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How to lay tile backer board on sandy cement floor

I've just removed some super old tiles from my bathroom floor. Most of the now exposed concrete is in decent condition. However the cement is a little soft / sandy around the drain area (it's an old ...
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How can I remove old tile mortar from a concrete floor?

I'm about to tile my bathroom floor but the floor is concrete and it is not flat. It still has the thinset trowel markings on certain areas and they are not in the same direction. How do I even out ...
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101 views

Second coat of Quikrete High Performance Self-Leveling Resurfacer

I've just poured a first coat of Quikrete High Performance Self-Leveling Resurfacer and have irregularities due to not pouring each bucket fast enough for the area I'm resurfacing (250 sf) and, i ...
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rainwater entering doorway below driveway

I have converted garage with door way about 4 inches below the driveway. Previous owner left this issue for me. My questions is i want to cut into concrete to create drainage system, french drain ...
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Possible Leak In Concrete

I recently noticed that our outside wall has a wet looking spot around the faucet. I tried looking in the wall at the pipe (from the unfinished basement), but I couldn’t see very far because the ...
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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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1answer
69 views

How to build a concrete patio

I am trying to build (extend maybe a better word) the back patio like this where the red box is where I want to add a new slab of cement. Like shown in the picture, the dimension is 18ft by 5ft-5in. ...
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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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Temporarily marking up a polished concrete floor [closed]

I live in a house with polished concrete radiant-heated floors. They're not polished to a shine, but they do feel very smooth. I' d like to apply a decorative pattern to the floors with some sort of ...
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63 views

Curing concrete in freezing temps

I need to pour a few cubic feet of concrete to make a new threshold but the weather forecast indicates temperatures in the low 20s F. Is that bad for curing concrete?
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How to lift/raise/repair a segment of concrete slab?

I have an 8-year old concrete slab around my pool. One slab has sunk by about 2 inches on the short side. The slab measures about 6 feet by 3 feet by 4 inches. It rests against the pool structure on ...
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285 views

Pouring concrete on top of old chunks and other larger rock

I need to fill in alot of area next to the driveway and have access to alot of rock and some old concrete. Can I port 4-5 inches on top and let it bleed into the crevaces or am I better off just using ...
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534 views

How thick should my concrete walls be?

I've been drafting a house for a couple years now and through many iterations I discovered one of the biggest flaws in how I was drafting was in not knowing what I would be building the house out of. ...
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Will using a paint or sealer on a concrete floor damage it?

I live in a 1st floor flat (relatively new build) that has concrete underneath the carpet. I'd like to remove the carpet and treat the concrete and have concrete floor. The floor seems pretty solid ...
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214 views

Can't make progress with a hammer drill into 60 year old concrete

I have a Ramset Hammer drill with the Hammer drill option set, speed set at low [1], and a new 1/4" masonry/concrete bit. I can't get more than an 1/8" in about 15 minutes of incremental drilling with ...
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282 views

How to install a safety barrier-post in garage, between house and vehicle

On the other side of the wall, in front of where my vehicle is parked, is my bedroom. Would like to install something similar to what you would see at store fronts that have parking spaces near the ...
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Footings for loft

I put 2×2' pad with 5/8 rebar 16 oc both ways is that sufficient for 4×16 pearlam sitting on 6×6 posts every 8' with 2×10 joists 16 oc for a loft as an office in a Warehouse
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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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