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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How to run wire through steel garage floor system

We are building a carriage house, with a 4 car garage and a basement underneath. The basement has steel I-beams and the metal b-decking that the garage floor is poured on top of as a ceiling. What ...
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2k views

Why are there metal tabs protruding from my poured concrete foundation walls?

What are these metal things sticking out from my basement walls? Can they be removed? If so, how?
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99 views

How long does concrete dust take to settle

I'm getting some wiring done and having the electrician chase the new wires. The walls are concrete so I know that this is going to make a huge mess and need serious work after the electrical stuff is ...
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1answer
69 views

Concrete question(s) about garage

I'm in a new to me house and have a few questions regarding the concrete setup in the garage. Most importantly, it is getting very dirty with the winter driving and caked with mud constantly. I have ...
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2answers
187 views

What type of cleaner should I use to remove a puke stain from concrete?

My cat puked on the basement floor in a couple places, but I can't seem to clean the stain. So far I've tried simply mopping with Pine-Sol®, which didn't work. Then I tried scrubbing/mopping with ...
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1answer
43 views

How to find a plastered hole?

I have a small issue. Few months ago my apartment got renovated, and I listed all holes in walls i want to keep for future use. The rest was, depending on depth, filled with concrete or plastered. And ...
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673 views

What are these metal tags attached to my poured concrete basement wall?

What are these metal pieces attached to my basement poured concrete walls? They are about 2x2 with holes and were pressed into some kind of goop. These walls were poured in 1979. Can I remove them?
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69 views

Electric shock from pellet stove

I accidentally let some hot pellets fly out of my pellet stove while stupidly cleaning the glass while it was on. The few pellets melted some of the carpet. I put them out with some water. When i went ...
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1answer
83 views

How do I fix this depression in my concrete patio?

I have a concrete patio with a 4-foot by 2-foot shallow oval area that retains water. The concrete is sort of a knockdown pattern (see photo). How do I resolve this depression without smoothing it ...
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84 views

New Basement Floor, house not framed yet

We are building a new house with an exposed basement. I had the floors poured a week ago while still warm in December. We have not framed the house up yet, meaning no deck, walls, roof, or HEAT. My ...
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486 views

Pouring concrete for fence posts in heavy rain

My contractor just poured the concrete and set the posts for a new fence we are getting and much of the work was done in the pouring rain. Will this hurt the concrete and effect how it holds up down ...
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1answer
41 views

Greenhouse (cold frame) side walls - footing question

Planning a hoop house, or cold frame style greenhouse. I live in Nebraska, we get pretty consistent winds, not unusual to have 50 mph gusts. I want set two parallel 3-4 ft tall rows of 4x4 posts, 4 ...
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94 views

Is it common for vertical joints to not be filled?

We live in a high-rise apartment, and the shower room cinder-block wall is covered by sheet rock. The wall separates our apartment from our neighbors' apartment. Anyway, I noticed that the blocks ...
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1answer
98 views

How do I make concrete out of mortar?

I need white concrete for a countertop sample, but the only white concrete-like product is white mortar. If I just add an equal sized bag of gravel to the mortar, will it be close enough to use as ...
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1answer
108 views

How can I prevent clothes and food stuff from going bad in a moist cabinet

My neighbors are constructing their house from ground up. We have concrete structures for almost all buildings here. When the walls are ready they need to water it so the concrete settles and get ...
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2answers
57 views

Low spot in patio

I have a low spot where rain/snow melt pools in a stamped concrete patio. There is a small crack that runs through the low spot. I know it's not an ideal situation as I live in an area that has ...
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1answer
423 views

Installing a strong-tie post anchor on unlevel concrete

I'm building a short (3.5 ft) fence in my front yard. I have most of the posts sunk in dirt holes, but two of them will need to be mounted on a concrete slab. The problem is that the slab has a ...
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2answers
146 views

Ground level deck - how to attach bearers to concrete

I'm building a free-standing deck that is at ground level on one side, and the ground slopes away to about 60cm on the other. My question is, what's the best approach for the bearers at the point ...
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2answers
102 views

What is the proper way to prevent water infiltration between exterior stairs and wall

My house has a full flight of poured concrete stairs (covered with decorative stone) that runs parallel to (and butts up against) an exterior wall. The interior wall had water stains at the basebord,...
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2answers
188 views

how to repair holes left by expanding anchor bolts in concrete

I have a large workbench which I inherited with my current home, and I'd like to replace it with one I'm currently building, mainly since the current one is pretty small, and the top of the bench has ...
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2answers
135 views

How to fill and finish joints on ceiling between pre-cast concrete planks

They are structural precast planks that form the floor above. I think the line is where the sheets are connected. I found a picture of them at http://ths.gardenweb.com/discussions/2578737/ugly-ceiling-...
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3answers
182 views

Ceramic tiles on concrete walls

Can I put ceramic tiles right on my poured basement walls ? I want to put a shower in and tile the walls floor and cieling. Should I put a false wall and tile over it or can I put ceramic right on ...
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2answers
61 views

Trying to finish a full basement but footers arent deep enough?

I have a full basement that we are wanting to finish, we hired a contractor to come out and estimate and he said we couldn't do it at all because of the slope of the land the footers weren't deep ...
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1answer
94 views

flat concrete roof with weathering course leaking in many places

It is about 30 yr old building with flat concrete roof with weathering course on top. It started leaking in many places during rainy season. The roof area is about 1200 sq.ft open.what is the remedy.
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Can I use self-leveling concrete on a very not-level surface?

My garage floor is probably 50 years old and is severely pitted, and decidedly not level. I don't mind it being un-level, but it's so not smooth that sweeping is much harder than it should be. Can I ...
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1answer
98 views

Concrete foundation crack

Two storey home, 14yrs old. Concrete foundation. Ground is mostly clay. Steel I beam crossing the middle of the basement ceiling to distribute load. The I beam is inset into the top of the ...
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258 views

replace load bearing post with steel column

So I have a joist that stops short of a stairwell and doesn’t connect to the foundation and I’m going to move the supporting beam back 2 feet (it’s about an 8 ft run between the header and other ...
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77 views

Insulating the concrete attic with rockwool slabs

I want to insulate the attic with rockwool slabs in an unusual way. My house is old and we may have to rebuilt a new house in next 5 years, so I do not want to spend a lot of money on this. Attic / ...
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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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54 views

What can I use as a concrete release agent for aluminum forms?

If I need to use aluminum sheeting as form for pouring concrete or another cement product, such as mortar/stucco, is there something (chemical) I can coat the sheet metal with so the cement doesn't ...
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6answers
165 views

Need to move concrete slabs to backyard

I am building a pizza oven for the backyard and part of the build instructions said to build three concrete slabs (2 that are 47" x 20" x 5.5" and another that is 47" x 29.5" x 5.5"). It asks you to ...
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65 views

Retrofitting a sloped bathroom floor

Current Situation I have a ground-floor bathroom (2.1m x 2.7m) with a level concrete base which has a smooth finish with some type of self-levelling aggregate. At present the concrete is covered with ...
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1answer
194 views

pouring concrete right next to asphalt driveway

I am planning to install trench drain in front of my garage. The driveway to the garage is asphalt (less than 2" thick), and the space between the trench drain and asphalt will be filled with concrete....
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Hanging picture on a very hard concrete wall

Situation: Appartment in a panel building. Very hard concrete walls -- all, thick or thin. No plastic hooks (like these on alibaba that usually work for people around do not work for me, the little ...
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423 views

Best way to make a hole in concrete wall

So my house has concrete walls and ceilings. There a few places i would need to remove some large holes like for vents or light fixtures. I was looking at a concrete hole saw which seems to be a good ...
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87 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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80 views

Recessed lighting in existing concrete light fixture

I have some light fixtures that are currently used and covered with blind plates in the corners of a concrete ceiling room. I was wonder if there was anyway to convert those existing light boxes to ...
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1answer
77 views

Moist sandy gravel between frost-proof monolithic slab and insulation. Is it going to freeze and expand?

I’m planning on pouring a monolithic slab with insulation beneath to prevent frost heave of the ground below. It’s a somewhat common technique, there’s just not many folks I can find in Massachusetts ...
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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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1answer
45 views

Driveway conversion to dog play area

I have a concrete driveway in mediocre condition (square slabs that are of varying conditions--some small cracks) that is on the side of the house which is narrow enough that it is not very functional ...
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80 views

Concrete driveway cured too soon and surface cement washed away

I had someone pour a concrete driveway for me. About 6 hours after it was poured it felt like it had solidified and was now only a little damp so I wanted to start curing it. I used a hose to spray ...
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1answer
125 views

Concrete Steps Moving Away From House

I recently noticed that the steps on my front door appear to be moving away from my house. The gap is large enough that some small critters appear to be getting in the gap to setup a nice home for ...
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1answer
47 views

Fixing Incorrect Concrete Application

I have a 400 Square Foot garage that has a lot of gouges in the concrete floor. I purchased some primer and Concrete Leveler in order to fix the gouges. I made a mistake and accidently mixed 4 times ...
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3answers
77 views

Bathtub Drain Leak near Concrete

After recently moving into a home (built in the mid 90's and apparently went through a remodel at some point), the guest bathroom tub started leaking. I noticed the leak in the room on the opposite ...
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161 views

Stem wall forming questions

I'm getting ready to build a new detached garage - excavator coming this weekend! After getting a few bids, I've decided I'm going to pour the footer & stem wall myself, and contract the flatwork....
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52 views

Concrete Slab touching siding and accumulating moisture

In my house there is a concrete patio which is touching siding and foundation. Since the grade of the patio is not correct near the place it touches the siding water puddles in it after rain. I am ...
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27 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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1answer
297 views

How do I seal the cracks between my asphalt driveway and my garage concrete slab?

I am not sure if this is an aesthetic problem or not. I suspect that if I do not fix the damage properly the water will continue to infiltrate the cracks and it will create larger problems in the ...
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2answers
178 views

Maximum height of hand-shaped concrete curb?

I need to guide water flow at the end of my driveway (see this question). My plan is to put in a concrete curb or hump to guide the water. I've gone all over the map in thinking of how to build it, ...
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281 views

White stuff coming out of my wall when dry

We painted my wall two times already first was a dark blue and some white powdery stuff was spreading after the paint dried, now we painted it again now in purple and it still has the white stuff when ...