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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Is it ok to use pneumatic tools underwater

I have a concrete that is stuck underwater. The concrete piece is too heavy. I think that I could break it into small pieces with my pneumatic impact drill.
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98 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
183 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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2answers
9k views

Are there any advantages to using metal post spikes set in concrete when building a privacy fence?

My neighbor and I are considering alternatives to wood-in-concrete fence posts for a privacy fence that can have significant wind load in an area that gets up to -30 degree frosts in winter. The ...
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2answers
181 views

Can I put gypsum and paint finish on top of a concrete fast set repair mortar?

I have a finished concrete pillar in my living room that I need to be patched and painted. The pillar has final gypsum and paint on top of concrete. Since the concrete is chipped off I need to use a ...
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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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2answers
130 views

Making an existing concrete step taller

I have a step down out the back door of my house and the first step down is way too far, about nine and a half inches. ...
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1answer
671 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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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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2answers
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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2answers
186 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
481 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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2answers
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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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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1answer
160 views

Should I stain or paint my blotchy concrete?

The house I just moved into has a lot of white spots all over the concrete. I want to stain the whole slab to get it looking fresh and nice. I had a couple contractors come out to help me resolve the ...
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2answers
35k views

How do weather conditions affect pouring a concrete foundation?

I'd like to understand how weather conditions affect pouring a concrete foundation. Are there concerns about pouring a foundation during cold, snowy, rainy, or otherwise inclement weather? Is it ...
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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
11k views

How to insulate a concrete slab foundation in an older house?

What are some ways to insulate a concrete slab type foundation in an older home built in the 1950's? As far as I can tell, the slab is not insulated at all and results in a very cold floor and living ...
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3answers
254 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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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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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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1answer
38k views

What is the difference between building sand and plaster sand

Recently I mixed a batch of mortar for building and was unsure if the hardware provided me with building sand or plaster sand.. What are the properties that differentiate the two? and are there any ...
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4answers
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Should I use a 6 mil poly moisture barrier for engineered hardwood floor installed over concrete slab-on-grade?

I am planning to install an engineered hardwood floor over a slab-on-grade subfloor. The slab is bone dry but I understand it's wise to install a moisture barrier anyway. My plan right now is to ...
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5answers
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How do I move a slab of concrete?

I want to build a fence in my backyard by my garbage stand is sitting on a concrete slab and that slab is in the way of where I want to put the fence so I want to move it over a few feet. The slab of ...
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3answers
171 views

What finish should I use for concrete on stairs?

I want to remove the carpets on the stairs in my duplex. it is a concrete staircase. I think I would need to repair it and then I want to coat it and leave it bare. what would be a good coat to use? ...
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79 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
94 views

How to stop water seaping inbetween concrete slabs

I have two slabs in a Home Office converted from a garage. The regular garage slab and another which is about 6 inch higher than the garage one. The lower one has a wall between the two except for a ...
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1answer
62 views

Increasing subfloor thickness under new shower pan

I ripped my old shower down to the studs and joists. The studs were rotten, the subfloor was rotten, and the top of the joists (in some places) were weak and rotten. I plan on replacing some studs ...
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4answers
5k views

How do I add veneer stone to an exterior painted wall?

I have an exterior painted wall and am interested in installing a stone veneer. I realize that I may have to install wire mesh to the areas but I'm wondering if there is a material that can be used to ...
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3answers
180 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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2answers
76 views

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
76 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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6answers
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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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1answer
280 views

Concrete porches pulling away from home and cracking

I have an 1940'sish home with old concrete porches (x3) they are cracking, chipping, and pulling away from the home. Would I be able to repair them? If not could I build a deck over them (wooden)? I ...
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3answers
85 views

How do I remove adhesive from outdoor concrete deck that is textured?

I have an outdoor deck that had the old green carpet truf glued down. I removed it some time ago and want to remove the adhesive from the concrete, it has the brushed finish so the adhesive is in the ...
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0answers
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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
191 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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3answers
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Few questions about concrete/cement wall inside of the apartment and which screws to use

I live in an apartment building that has concrete/cement walls. I am still not sure which one it is. I included the image which has the wall in the background. I would like to know which screws i ...
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0answers
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1answer
76 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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0answers
87 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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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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3answers
7k views

Extending concrete Slab

I have a 10 x 10 slab (4 inches thick) that is already in my back yard in the corner. I bought a kit to build a 10 x 10 shed on it, and then realized that would put it right up to my fence. So my ...
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2answers
79 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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4answers
901 views

What is an appropriate sealer for a Papercrete bench?

I've built a bench out of tires and papercrete two years ago. i've sealed it with lime plaster. in the past two years it held up against 500 m"m of rain in the winter and Mediterranean sun 7 month ...
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1answer
124 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 ...