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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52 views

New build next to existing slab

I want to build a new structure, with walk out basement joining up to an existing structure that has a slab foundation. Is this possible? what about the slab/footer for the existing structure, how do ...
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154 views

How to fill cracks in concrete slab inside house

My house had some foundation issues and the slab inside the house has separated from the foundation wall mostly all around inside the house. Some cracks are about 1/2" and I'm thinking in filling ...
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2k views

Leaves in concrete showing through

We had a new concrete driveway, sidewalk, and stoop installed in late November (it is now early January). The leaves were still falling around the time of the installation so I asked the contractor if ...
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737 views

Pouring drainage channel right next to foundation, how to protect the foundation?

Ugh. How can I arrange details on this concrete pour, to not damage the foundation later? This is San Francisco Bay area (no freezing). The visible clay pipe is a high volume gravity drain from the ...
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755 views

How to repair broken suspended cement slab

The very corner of the cement slab, which forms the floor of my basement, broke off. There was nothing supporting it underneath. the portion that broke off forms a triangle 11" x 10" x 14" x 3-6" ...
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61 views

Basement Floor Cracks

I have very thin cracks in my basement floor and I'm attempting to patch them before trying my hand at acid staining the floor. I've read some differing opinions on the use of hydraulic cement or ...
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451 views

Raising internal floor - to screed or not to screed?

The porch of our home has been made part of the interior. We now need to raise the floor to meet the level of the existing floor internally. The total height of the step is 5cm. So the floor needs to ...
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48 views

Is having concrete bonding primer on top of a layer of concrete stain ok?

I had a bit of a lapse in reason when redoing my concrete floor. I ground down the floor, let it dry, and then applied a concrete stain (two coats). Then, because I wasn't thinking, I applied Behr ...
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88 views

How to prepare concrete for epoxy floor coating when it's been repaired with a epoxy hole repair?

After taking our garage down to the studs to remediate black mold, and replace drastic termite damage, we intended to just scuff up the former owners concrete paint (I think now it was probably latex ...
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774 views

How can I level a concrete floor in a basement room?

I have a room in the basement with a concrete floor that slopes 2" over 11 feet. It's finished in that it has drywall, but there is no flooring yet. I need to raise the floor to be level. The room ...
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59 views

Concrete color — dark blotches

We're building a house that has poured-in-place concrete walls. I like the look of concrete, and we were planning on leaving some areas naked, both inside and outside the house, with some added stain ...
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50 views

Type of Reinforcing Mesh for Concrete

I'm looking at getting a lot of concrete work done and am looking to educate myself past the minimal anecdotal information I posses to be better armed when talking to contractors. What kind of ...
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3k views

Painting Brand new concrete floor - is an acid wash necessary?

I just bought a newly constructed house that has a large (20x20) attached shop with a concrete floor. I want to paint the floor. I've looked at several sites on how to do this, and they all say to ...
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80 views

Concrete slab between stories

Here in the U.S., pretty much all the houses, even those that are made of brick, have framed floors, meaning there are 2 x (usually 10) joists from one side of the house to the other and then OSB ...
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48 views

Should access to original concrete be considered when framing a basement?

I'm just wondering when I frame the basement is there a convenient way to allow access to the original concrete walls and floor. I've never noticed anybody ever having much concern for this, but ...
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58 views

Using Porcelain tile on a concrete pad outside

I have a small(ish) - about 12ft x 12ft concrete pad on the back of the house covered by the house's roof with 2 walls exposed. The concrete pad appears to be solid - no major cracks, flat and level. ...
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867 views

Hang a plant pot to a concrete ceiling

Having fixed quite a few things to walls in my life, I am about to hang something for the first time to a ceiling. It will be a plant pot weighing below 5 kg. The ceiling is made from concrete. I have ...
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508 views

what is best vapor barrier for second floor bathroom on a concrete slab?

My question is about the separation of the bottom of the 2" concrete slab I'm installing as subfloor to my second floor bathroom, and protection of untreated wood beams and joists in 1876 house: I"ll ...
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90 views

What are the steps or phases to prepare a basement for finishing?

I've got a small house with an old finished basement, and want to refinish it. I've removed most of what's there (carpet, panel walls, old ceiling tiles, floor tile, etc) and am at a point where I ...
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2k views

Need advice on deck posts that will have concrete poured around them

I have a raised deck, attached to the side of my house on one side and held up by three posts on the other. Under each post is a small cement pad and the posts bracketed to those with a buffer piece ...
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258 views

Easiest way to replace mortar around door?

I have a stone house and some of the mortar around one of my door frames has completely eroded away, there are big gaps and I can now see the screws that once screwed into the mortar too hold the door ...
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70 views

Description of Concrete Classification Numbers (e.g. C15, C25 etc.)

I was reading my plumbing code and came across mysterious concrete classification numbers like C15 and C25. I tried googling it and only came across a couple of sources describing these numbers (like ...
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736 views

What is this landing/wrap-around feature on porch steps called.

What is this style or feature called? If it has a name...!
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971 views

Is there a purpose for the concrete border at base of this house?

My wife and I are in negotiations to purchase a house that is located in the Southeastern US. The home inspector was a bit baffled by the concrete border (first image) that runs along the back and ...
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68 views

Proper method to seal a heated crawl space

I have a heated crawlspace with a dirt floor. There are no vents, it is fully connected to the house, and currently has a pool liner and vapour barrier stretched over it, but it is not sealed. There ...
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388 views

Monolithic frost proof shallow foundation, advice on the smaller details?

I'm building a 16x24 shed/garage. I have done most of the site work and I have a concrete guy starting tomorrow on the forms in preparation for a pour on Friday. He's done insulated slabs, he has 30 ...
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210 views

Can I expand a concrete slab by 3/4"?

I have an above ground exterior concrete slab that we'd like to surface with 2" x 2" porcelain tiles. The slab is just a little too small – about 3/4" in one dimension. I'm wondering if it would work ...
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34 views

How effective is elevated concrete for insulating moisture?

I am replacing a boiler in my basement and the contractor told me it will be better for the new boiler if he build an elevated concrete platform on which the new boiler will sit. He says this will ...
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56 views

Replacing Kool decking

I want to replace my cracked and bumpy Kool deck. What do I need to do to take it completely off my pool deck?
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472 views

How to fix concrete delamination

When I made some concrete flooring (my first time doing it) I finished the surface while there was still bleed water (I didn't know it better back then). Now 2 months later in a few areas there is ...
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308 views

Repairing/patching concrete foundation of house

What's the best (or maybe easiest and most affordable would be more accurate) route to patch the concrete of our house foundation? It's kind of crumbling in places and needs a facelift. Ideas/options?
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739 views

Should a concrete pool look like this after an acid wash?

I'd like to redo after the contractor who did an acid wash of my pool: But before I start, I'd like to understand (since I have never seen the pool acid washed before): is that what "the product" of ...
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505 views

Is this vertical gap in the concrete block foundation something to worry about?

I'm looking at a home that has a vertical gap or crack running the height of the exposed concrete block foundation. The crack is near the center of the home, about a foot to the right of the concrete ...
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3k views

How can I edge concrete without an edge trowel?

How can I make a concrete floor (also using dry shake color hardener) with a proper edge, without using an edge trowel? In Brazil I cannot find an edge trowel anywhere, so I would like to know if ...
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246 views

Repairing exterior cement wall

I have an exterior wall on one side of a brick building that appears to be stucco or cement. Some of it is starting to come off in sheets. Basically, there is one layer, maybe the thickness of orange ...
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229 views

Applying thinset to concrete floor

I am planning to install ceramic tiles with a "Warmup" heating element beneath them. My first step is to install 1/4" insulation boards on the concrete floor using non-modified thin-set. The floor ...
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2k views

How do I repair cracks in the concrete pillars supporting my patio roof?

I have two round concrete pillars that support my patio roof. I have noticed that they have cracks even though they are new. I suspect the filling of mortar and bricks inside those pillars was not ...
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47 views

Can isolation joints between slab and wall be saw-cut after the pour?

Contractors poured a new concrete driveway slab up to existing concrete wall, concrete house foundation, and garage slab. Found out the day after the pour they did not install any isolation joints. ...
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25 views

Drain pipe issue

I recently had a concrete patio poured and I'm looking for some help on how to deal with where the water drains. I think I need some type of metered catch basin. Right now " as is" my ...
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76 views

Type of UK House Construction

not sure if this is the correct forum for this, so please let me know if it's not 🙂 Is anyone able to recognise the construction type of this house? I know it's concrete construction and likely built ...
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1answer
41 views

Hanging a 20lbs lamp from a concrete ceiling, what to be aware of?

I’m trying to drill a hole into the concrete ceiling in my apartment to first insert a hook, then hang the lamp through. The lamp is a plug-in btw. Just wondering what are the necessary tools and ...
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1answer
64 views

Cracks in Basement Floor

We are in the process of buying a home and most of the homes we see have cracks on the floors in the unfinished part of the basements. We are worried about buying a home that is not structurally sound ...
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1answer
38 views

Install wall or ceiling light in room with concrete walls

I have a bedroom with no ceiling light. The main switch controls a power outlet to be used probably with a floor lamp. I need to install a wall or ceiling light from the power outlet controlled by the ...
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77 views

Will cutting a trench affect structural integrity of the foundation

I am renovating my kitchen and putting in an island, by the code an island must have an outlet. I will have to put a trench into my concrete slab foundation to make it happen. (To run the electrical). ...
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Wall mount desk to wall

So I have a small room that I have my pc setup in. Unfortunately this means the pc is crammed up against the bed and desk legs. It is against a concrete (airated I believe) wall. I want to use L-...
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36 views

How to improve cooling in a room/Cool a concrete wall?

Im on a 2nd floor room, it has big front windows and a small one on the side, I am using my computer/full setup on the corner of the room, where beside me is the window wall, but since im in the ...
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33 views

Mixing Exposed Aggregate and Stamped Concrete - One Pour or Two?

I'm doing research for a project I'm asking for bids on and I'm wondering how much you can mix decorative concrete treatments. I want a large exposed aggregate patio, but in order to break up this ...
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1answer
63 views

How to prepare a rough concrete slab for pavers

I tore my old wood deck out and am planning to lay pavers on top of the concrete slab that was beneath it. I'm following the instructions here, photo below: The inner paver bricks will have a layer ...
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43 views

Patching a hole in wall for reuse

I was trying to hang an IKEA Kallax shelf on the wall but ended up tearing away part of the wall. I am not too sure what kind of wall this is (in a ~1960s apartment building), first layer looks like ...
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43 views

What material should go between old and new concrete?

I recently poured a slab for a hot tub and I want to pour additional concrete around it for a walkway. I want to keep the new concrete separated from the hot tub slab in case they heave at different ...