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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40 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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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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How can I repair this small hole in my basement floor?

Last summer I noticed water coming up from my basement, always in the same spot. The rest of the basement is bone dry and we have french drains so I was baffled. This winter, I tore up the tile that ...
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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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584 views

How to fill gap between garage floor and driveway

I have a concrete garage floor and a section of concrete driveway next to it. Over the years the driveway has settled a little bit and the gap between the two is probably close to an inch wide and ...
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1answer
52 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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3answers
561 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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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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63 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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650 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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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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How can I level concrete pavement for an above-ground pool?

I want to set up an above-ground pool (14' round) on my back yard. There is a relatively good place for it, where there are concrete slabs, however, there are two problems: The slabs are not level. ...
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118 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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118 views

Concrete column splice - weld or surround with 6mm?

I have a concrete column using 16mm rebars. The column needs to be extended (and of course the rebars) for the 2nd storey of the house that is being built. Should the splice be welded or surrounding ...
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3answers
130 views

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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1k views

How to join melamine sheets for a concrete mould?

I'm planning on making an L-shaped concrete kitchen countertop (2100mm x 2500mm) with a single large piece of concrete (Yes, I know, see below!). As the melamine sheets only come in a max size of ...
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1answer
37 views

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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Concrete countertops ghosting fix?

I just poured my very first concrete project over the weekend and made what I think is a rookie mistake. Somehow I have ghosting from the metal wire that I used as reinforcement. As you can see here:...
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4answers
816 views

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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2k views

Large concrete patio poured against the foundation - should it be tied to the foundation or not?

Over a year ago I had a large concrete patio (24' x 26') poured. This concrete patio butts up against the foundation of our home. I'm unsure if it was tied into the foundation of the house or not, ...
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1answer
68 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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4answers
1k views

Need advice to prevent runoff water from going into neighbor's yard

I'm looking for some advice on what I can do to prevent runoff water from going into my neighbor's yard. I am an auto detailer so I am constantly washing cars in my driveway. The neighbor also parks ...
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1answer
215 views

Concrete post base wood too tight

I'm using the Simpson PB66Z "Galvanized Post Base" to attach my pressure treated 6x6 to the footing. The wood seems to be slightly too large to fit such that the bottom of the post rests on the metal. ...
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199 views

Concrete porch demolition

I'd like to demolish concrete porch. I’d like to demolish: - the concrete stairs (it’s about 3’x3’x3’) - the slab (about 3’x5’x5", all cracked with rusty rebars) - the 2 brick columns - the metal ...
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1answer
86 views

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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Is this cracking foundation under a jack post a problem that requires repair?

I am buying an already-built new home. I find this in the basement. The builder says it's okay, but I am really concerned. Is this really a big issue? What steps would be required to repair it? This ...
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62 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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1answer
239 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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1answer
13k views

What's the best ratio for sand-only concrete?

I'm making concrete countertops, so sand-only is the way to go to reduce voids in the forms. (I've done a half dozen samples). I've looked everywhere for mix ratios, but it's a weird request, and I ...
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242 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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39 views

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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188 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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4answers
199 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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1answer
20 views

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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Stamped concrete is dangerously slippery

We had a contractor put in a new walkway of stamped concrete. He applied a wax coating to protect it. Now, whenever it snows the combination of snow and wax makes it extremely slippery -- like walking ...
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Do I need any kind of separator / release agent when casting concrete in shuttering plywood forms?

We'll be casting my first concrete countertops soon. We already talked thickness, reinforcement and sealing with manufacturer of concrete mix we will be using (great guys!) so on that part, we feel ...
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Fast Setting Concrete vs Regular?

Other than the ~1 hour set time of the fast setting stuff, are there any other pros or cons to it? We're looking at putting in about 45 fence posts or so and I'm running costs. The regular 50lb ...
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50 views

Fixing void on face of concrete steps

My front steps are crumbling on the top. I wondered what I could do to fix this? Thanks in advance all!
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79 views

How to level this area of my garage?

I have an area of my garage that is lower and sloping towards the house. When the car is wet or covered in snow, it melts and runs down into this area in front of the stairs and makes a mess. Ripping ...
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1answer
75 views

Patching hole in cellar floor when water seeps up from ground

I had two holes in the poured concrete floor of my cellar. I was planning to fill both holes. So far I have only filled one because I ran into a problem with the other one. How I filled the first ...
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Cinder block wall fasteners

Good evening I'm installing an IKEA pax wardrobe onto drywall attached to cinder block. I've successfully used a tapcon in 5 of the 6 attachment holes. The 6th tapcon gets 90% of the way in and then ...
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3answers
254 views

Need to add traction to existing polished concrete surface

My front porch is polished concrete, and gets slippery in the rain. What is the best way to add grip/traction to an existing concrete walkway? More info: My front porch is part of the house slab, ...
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How do I add grip to concrete sealer after it is already applied?

Last fall, we had H&C Colortop Solvent Based Concreat Sealer 250 applied to a textured concrete driveway and walkway. It look amazingly better and have gotten many complements from the neighbors, ...
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12k views

How do I hang a chair from a concrete ceiling using a single hook?

I'm putting in a "hanging chair" in the basement and it's supposed to hang from a single hook in the ceiling. The ceiling is reinforced concrete. Now, I'm about 125 kilograms (275 lbs) so I reckon ...
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2k views

How can I hang a large but light poster on a concrete pillar?

I have a large (est. 5'x7') sheet of plastic foam with a poster printed on it. It weighs maybe 3 lb and is reasonably stiff. I'd like to hang it on a solid rectangular concrete pillar about 2' wide. ...
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19 views

Mount cement counter top

I made an outdoor cabinet out entirely out of cedar. The counter top was made of cedar 1x4s originally but that proved to be a bad idea at preventing water ingress. Since then I've made a custom ...