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.

learn more… | top users | synonyms

0
votes
0answers
15 views

Joists \ sleepers for decking over concrete patio

I'll be getting a 10x12 concrete patio attached to the back of my new house - not my first choice, but that's what it is. I wanna put Trex or some other composite decking over the concrete patio - ...
1
vote
1answer
19 views

Removing the concrete from the top off a concrete column

I have a number of 12" square concrete piers reinforced with 10 * 16mm rebars. The rebar extends to around 4m tall, while the concrete has been poured to a height of 3.3 metres. This an error because ...
1
vote
1answer
20 views

How to deal with soil erosion under slab floor of garage?

There is a small crack extending 10 feet down the center of the slab floor of my garage. The floor sounds hollow when I hit it with a 2x4. Also, there is a 4" water drain and I can feel air when I ...
3
votes
0answers
42 views

Can a slab under load be concrete jacked or otherwise supported without taking down the wall?

I have an issue with soil erosion below the front corner of my garage floor which has caused a crack to form and a piece of the slab (~4sq.ft) to sink. This in turn is affecting the portion of the ...
3
votes
2answers
44 views

What Cement Based Product Is Used for Smoothly Finished Floors?

I recently replaced a floor drain in my basement around which I had dug out the concrete, gravel and clay soil. When I sealed it back in, I laid down a bed of gravel and sand, and then used a ...
4
votes
0answers
52 views

Foundation for structure on bedrock

We have the mixed blessing of a giant swath of exposed Canadian Shield on our property in Ontario. Literally a big flat area of exposed rock, no soil whatsoever. Scale is hard to see, but a ...
0
votes
0answers
35 views

What product can I use to level an uneven garage floor?

I have an uneven garage floor that goes up to 1 inch deep from high to low level spots. I want to make the garage even. I was thinking of a self-leveling compound (watery). Which brand or type should ...
0
votes
1answer
39 views

Drywall skim coat over painted CMU?

I have a small section of wall (50sf) where the stairwell goes into the basement that is CMU (concrete masonry unit or concrete block) painted with at least an egg shell, possibly even semi-gloss. ...
0
votes
1answer
44 views

How to drill to insert rebar into a large rock (5mx5mx5m)

I am pouring a reinforced concrete beam. It contains rebar. I would like to insert the rebar (horizontally) into this rock: What kind of drill and drill bit and to what depth should I drill to ...
-1
votes
1answer
38 views

What is the difference between the coolness of different wall types in hot weather

Given a 30cmx30cm concrete beam and pier structure, with infill, and year-round (equatorial) daily temperatures of around 25C-33C, with around 80% humidity. What is the difference between these ...
1
vote
1answer
26 views

Resurface exposed aggregate concrete patio

Is it possible to resurface an exposed aggregate concrete patio? My current patio surface is about 20 years old, and the aggregate has deteriorated a bit and is pretty ugly looking and painful to walk ...
0
votes
0answers
18 views

Concrete “post footings” for concrete patio floor?

The typical way of doing a concrete patio floor is to excavate soil at least 9", pour & compact gravel, then pour concrete. I was wondering, what will happen if: Excavate post holes, past the ...
0
votes
2answers
43 views

Best way to support carport posts

I'm wondering if I can reinforce the posts in my carport as it seems one good earthquake could throw these off. Any thoughts on building a form out of wood and pouring concrete around and half-way up ...
1
vote
1answer
43 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 ...
4
votes
2answers
76 views

Can I sink existing concrete?

We got a house where it has a one foot strip of concrete that is 20 feet long besides a patio that is in good condition. On this 1'x20' strip there are two spots where the concrete has risen about ...
1
vote
1answer
18 views

Should I leave gap between my house's slab and a new one I'm laying outside in the garden?

I'm planning an outdoor kitchen. This will be a simple brick sided bench about 3 metres long and maybe 800 mm deep. I'm going to build it on a slab to support the weight and ensure a level surface. ...
1
vote
0answers
43 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 ...
1
vote
1answer
24 views

What type of beam should be used over a split arch doorway?

I am building a building in Indonesia. It's using RC-frame construction. My builders don't have much expertise, nor do I. The basis for my building is three reinforced concrete pillars, 30cm * 30cm, ...
3
votes
1answer
39 views

How should I prepare the site for a concrete step?

just bought a house where we've got an existing concrete slab porch that is 12" above the adjoining sidewalk and it does not have a step. We want to add in a large 6" tall x 3' wide x 11' long slab ...
1
vote
1answer
32 views

Are smaller or larger pavers better for covering a concrete patio?

I have a large ( 16' x 16' ) thick slab concrete patio that is pouted in 8 x 8 blocks. it has significant spalling and some settling. The concrete is 6" thick and situation in such a way that tearing ...
3
votes
3answers
43 views

Are hairline cracks in basement concrete floor a problem - no water coming in

I notice quite a few hairline crack in my basement concrete floor. I've lived here for 14 years and no water has come up through the cracks. The townhouse was built in 1999 (so it is not a new pour). ...
0
votes
1answer
20 views

laying a new bathroom sub-floor on to sand bed

The floor is fully ripped out and sand exposed. New plumbing ( wastes) in place but now to pour the new sub-floor. What do we do now? Approx. 0.5m3 for 100mm thickness.
2
votes
0answers
21 views

Damp concrete floor in bedroom

Had water overflow into bedroom and closet. New laminate floor removed. Concrete floor has glue strips from another flooring that is sticky in some places. Will thoroughly clean with as little water ...
0
votes
0answers
11 views

What to Look for in Professional Products for Vapor Sealing Concrete Slab

I'm planning to seal a concrete basement floor soon. While I haven't had any water problems, the basement has a smell to it which seems to be the smell of the soil/clay underneath the house. What's ...
2
votes
1answer
34 views

Can I build a car-port on the side of my garage?

I have a 2-car attached garage but three cars in the household. While I'm obviously aware I can just leave the third car in the driveway, it inconveniently blocks the cars in the garage and in the ...
0
votes
0answers
31 views

Ground preparation for deck pier block

I am planning to extend my deck, which uses pier blocks as below photo I cannot tell what's underneath this pier block because it was just dirt. There was no pour concrete for certain. So my ...
0
votes
4answers
66 views

How to level out or grind down concrete basement floor?

I had a french drain installed in my basement and the top of its cement sits around 1/8" to 1/4" of an inch higher then the rest of my basement floor. I need to somehow level this out so I can put ...
1
vote
2answers
136 views

Should cement be placed under concrete slabs for driveways or is sand enough?

I am about to get my driveway full slabbed using normal concrete slabs like below (i will be using rectangle slabs as opposed to square). The builders that came to give me an estimate said it would ...
1
vote
0answers
13 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 ...
0
votes
2answers
63 views

What can I do to transition between concrete and drywall?

I am drywalling my unheated, partially-below grade exterior garage. A four-foot tall concrete wall runs along the parts of the garage that are below-grade. Above the concrete walls are 2x6 wood ...
0
votes
1answer
41 views

How Should I Fill In a Hole in Slab Around Floor Drain

I think I have a good idea about how to go about this, but wanted to throw it out here to make sure I don't wander down the wrong path. I recently installed a new floor drain. I broke up the ...
1
vote
1answer
36 views

What drill and screws should I use to attach security bar to a concrete wall

I have a few security bars to attach to my garage window. These are the bars: http://www.ebay.co.uk/itm/291320181452?euid=37bd934e70374116905fb2a20e9f7fad&cp=1 I have the Face Fix Brackets. The ...
0
votes
0answers
31 views

Load-Bearing (?) Cinder Blocks Half-Corroded Away

In preparation for patching and repairs, I knocked down all the loose material from an old, water-damaged wall. In the process, I discovered an area where a couple of the cinder blocks underneath the ...
0
votes
0answers
44 views

Ideas on how to hide sprinkler wires?

Just figured out how to wire sprinklers (yay!) but I've left myself with this pretty ugly situation. I was thinking of hiding the wire below the stone, but I'm not sure how to hold it. Can I drill ...
2
votes
2answers
52 views

What are my options for saving this building?

I have a small building on my property that is about 15ft by 10ft. The building sits on a slope that runs downhill sort of at an angle from one front corner to the opposite back corner. It sits on ...
0
votes
0answers
41 views

How do I repair a few broken concrete blocks in a stoop foundation?

I have a ranch home built in the 1960's. It has a full foundation under the front stoop. The stoop is a concrete slab. Settling over the years led to horizontal cracks about 36" below grade. In ...
1
vote
2answers
57 views

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 ...
1
vote
1answer
28 views

Adding a layer of concrete and tiles in the garage

I just wanted to get opinions on my plans to fix the somewhat sunken slab in our garage. We bought the house two years and (it's about 50 years old) and I have been monitoring the slab since day 1. ...
1
vote
1answer
37 views

Soil under slab (sidewalk) washed away and is now causing cracks down the middle

I have a 50' x 6' concrete slab in front of our basement that supports the same size wooden deck above with 6 post for the upstairs. The soil under it washed away due to poor drainage. I have fixed ...
0
votes
1answer
33 views

Creating a concrete mix with smooth texture

I would like to create a small concrete table(~.5m diameter). To do so, I would like to create a concrete mix with smooth texture, similar to Quikrete. Since this product is not available where I ...
1
vote
1answer
22 views

What is the best way to protect a burnished concrete floor during construction?

I am doing a new build. The floor is burnished concrete done by High Trowel finish during concrete pour. I need to protect the floor afterwards. What is the best way to protect a burnished concrete ...
1
vote
2answers
32 views

Flattening Concrete for Dricore Product Suggestion

I am in the process of laying DRIcore panels in my basement. The ultimate plan is to lay laminate (Pergo) floor once we reach the finish stages. I have a few small areas where the concrete dips ...
1
vote
1answer
37 views

Ceramic tile on concrete with shrinkage cracks

I am interested in the opinions of any experienced tile-setters here as to ceramic tile or stone laid on concrete regarding crack isolation. I am building a new house with lightweight concrete poured ...
3
votes
2answers
56 views

Will a few weeks of exposure to the weather damage cementboard?

I am getting ready to put Durock on my outdoor grill area. I am wrapping it with stone but it will be a few weeks before the stone comes in. Will the rain damage the cement board in any way or should ...
0
votes
2answers
75 views

Replacing a crawl space with concrete slab

I have a 1970 rental house that is prone to flooding the crawlspace approximately 1 week a year. To clarify, the whole section of land, yard, and streets are under a foot or more of water, due to ...
13
votes
7answers
1k views

Should I set wood fence posts in quikrete with no supplemental water?

Setting wood fence post---I've heard to set wood fence posts using quikrete dry, allowing it get moisture from the ground. Is this a good idea?
2
votes
2answers
35 views

Raised Concrete Patio Drainage

I recently purchased this house which has a raised concrete patio in the rear that has a large depression in the middle probably 4' wide by 6' long. You can see the cracks in the concrete where the ...
7
votes
4answers
175 views

How to support the side of concrete steps?

Last spring, we decided to remove a concrete walkway (and much of the soil underneath it) behind our house and replace it with either a pea gravel or decomposed granite patio with boxwoods and a fire ...
9
votes
4answers
965 views

How much concrete for a fence post?

We're going to build up a 4' fence around our property sometime in here in the spring or summer with 4x4 posts. I've seen that you should bury 1/3 to 1/2 of the above ground post height; so this ...
3
votes
1answer
68 views

Anatomy of a concrete wall – what are all these layers called?

So my partner and I are trying to resurface a concrete wall in an old house in Taiwan. Before I get into the nitty gritty of asking how, I just want to clarify my terminology first – I think I've got ...