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.

Filter by
Sorted by
Tagged with
2
votes
6answers
749 views

Cut rebar in concrete

I opened up a hole in my concrete wall to pass a threaded PVC 2 inch male adapter. On the other side there is an aluminum metal sheet. The problem is that I hit rebar and can not change the position ...
0
votes
0answers
76 views

How serious is this spalling?

Spalling is occurring on the corner of the top of the first story. I'm curious as to how serious this is.
2
votes
0answers
45 views

Extend/splice 12/2 romex along concrete finished wall

I would like to extend some wiring for a counter outlet that is running behind a refrigerator, which currently encased in a metal "cable concealer" raceway. Note: wiring is in a raceway because most ...
0
votes
1answer
87 views

Tile uneven fireplace hearth concrete

I remodel my fireplace and the hearth was poured concrete over: I plan to install tiles over the 3 sides However the surface is not even and not 90 degree You can see the bumps from previous ...
0
votes
2answers
169 views

What to use as a screed edge along a brick wall?

I'm planning to pour a concrete slab along a brick wall and need to plan how I will screed it smooth. Three sides of the rectangular slab will have a removable wooden form, but the fourth side is ...
4
votes
2answers
13k views

How to patch concrete as invisibly as possibe?

I had a plumbing repair done this week that required them to jackhammer a small hole through a concrete porch in front of my house. It is small enough that I’ll probably attempt the patch myself, but ...
1
vote
1answer
105 views

Need More Water in Quikrete than Recommended

I am pouring a series of concrete slabs for a patio and I’m using standard 80lb Quikrete bags (https://www.homedepot.com/p/100318511). The directions recommend 3qts of water per bag and a max of 4....
2
votes
3answers
832 views

Can I add cement glue and sand into my concrete mix to repair my cenent garden statue?

I have a leopard concrete garden statue that was given to me by my neighbor that has a broken foot and log. I want to repair it and paint it. It also has been weather eroded so I need to recover it as ...
2
votes
1answer
10k views

How wide does a 6x6 concrete post footing needs to be?

Need to attach 6x6x8 posts for a free-standing pergola - I'll use Strong-Tie anchors attached to the concrete footing. The hole for the footing will reach well below the freezing line, but how wide ...
0
votes
0answers
34 views

about preparing concrete slab for leveling

I am preparing concrete slab surface for leveling it. I removed the tiles first, and grinded away the remaining thinset mostly nearby the boundary of tiles. Here is the picture of the current ...
1
vote
0answers
33 views

Reducing moisture from semi-finished basement concrete floor

I'm looking for advice for a good way to reduce moisture seepage through my basement concrete floor. My research has turned up several promising approaches: Surface-only treatments Specialty paints ...
0
votes
0answers
30 views

Asphalt Impregnated Board as Isolation Joint

I am extending a concrete patio in my backyard and have decided to connect the new slab to the existing slab, but I am using asphalt impregnated boards to form an isolation joint between the new slab ...
0
votes
3answers
79 views

Can tile or click-lock wood be installed directly on rigid insulation foam

We would like to insulate a concrete condo floor and for height purposes (already low ceilings as well as not modifying fire doors) we cannot add much material to the concrete pad. Typically in this ...
0
votes
2answers
90 views

Reinforcing concrete parapet?

One small section of our roof's parapet looks like this. We will be installing one 3/8" x 3" havy-duty concrete screw anchor in that area. The ideal solution is to remove and replace with new ...
0
votes
3answers
100 views

Grout and/or thinset flushed in septic system

All. My contractor is awful. If we weren't almost done with the project, I would kick him off my property and sue him. Anyway, it appears that he dumped excess thinset or grout into my basement ...
1
vote
4answers
109 views

Is it a problem to leave a sprinkler line through concrete shed footing?

I'm in the process of getting an attached shed built in my house (due to HOA restrictions). They seem to be very competent. The contractor is subcontracting the concrete foundation pouring. They have ...
1
vote
1answer
68 views

How to repair thin concrete deck cover

I recently bought a house with a deck that has what appears to be a thin layer of concrete over wire mesh over wooden (2x6 or similar) beams. A friend mentioned that he figures the concrete was not ...
1
vote
1answer
106 views

Would a concrete ramp added to an existing slab be less durable?

To remediate a situation my concrete company caused by changing the layout without consulting me, they propose to add a ramp partially on an existing (though new ~10 days) slab. I'm worried that it ...
0
votes
0answers
18 views

What product should I use to reseal an aggregate patio?

The surface was never really "smooth", but metal patio furniture with plastic gliders on its feet used to move easily across it. Now, the surface is rougher and pebbles are loose and get washed or ...
0
votes
1answer
104 views

Please help! Exterior Sliding Door Leak on Interior Slab - No visible threshold - 1980 construction

I have a townhouse built on a concrete slab. Laminate flooring was installed 5 years ago, and has buckled severely at the patio door. I suspected water intrusion, cut back the laminate, and saw: The ...
0
votes
1answer
91 views

Bury a Retaining Wall

We are building a gunite pool (roughly 20’x40’) on a sloped yard. It appears we will need a 70’x6’ retaining wall for our slope. One person that builds retaining walls suggested building the wall one ...
1
vote
0answers
73 views

How long will a concrete bore plug take to cure?

I have sealed an old abandon deep boring which was 220 feet long. First I poured small stone chips up to 7 feet and poured liquid cement mixed with Dr fixit up to 220 feet. My boring had PVC cashing ...
2
votes
1answer
141 views

How cut 4“ wide, 2” deep hole in concrete floor

I'm looking for advice on how to efficiently cut a rough hole about 4" diameter and 2" deep in a concrete floor. My tools are: a new 4.5" angle grinder with a diamond-cup grinding wheel and a diamond ...
0
votes
0answers
21 views

Laminate flooring on three seasons porch issue

Hello, I just pulled up the carpet in my three seasons porch to put in laminate flooring. The wall against the house has a strip of wood coming out from under the wall panels the width of the wall. It ...
18
votes
3answers
3k views

What happens to foam insulation board after you pour concrete slab?

I plan on making a garage out of a large carport, and I've watched and I understood how to properly insulate a new concrete slab. 4 inches of gravel, vapor barrier, 2 inch foam board, 2 inches of sand ...
0
votes
2answers
170 views

Help me figure out my wood shed foundation!

I recently bought a house that already had a (~2 year old) 12ft * 10ft shed in the backyard. Currently the shed just sits on some gravel. I plan on turning the shed into a 2 room sauna/changing room ...
0
votes
2answers
4k views

How to prevent concrete roof from Absorbing water

It's winter again and rainwater still collects on my flat roof due to it's bad tilt, Because of that the concrete absorbs a lot of that water into the second floors roof and it's really visible on the ...
5
votes
9answers
47k views

How can I pour a concrete floor over a particle board subfloor?

I want to pour concrete over the particle board subfloor in my living room. I like the look of stained concrete. We have a crawl space underneath. What product do I use? How thick so it won't crack? ...
1
vote
1answer
44 views

Bases for anchoring 2" tubes?

Is there a base, similar to this simpson 4" 12-gauge ez base, that can be used to anchor a 2" steel tube/pipe? It would be exactly the same thing, but instead of a 4" square, it would be a 2" round ...
2
votes
0answers
44 views

Iron bar set in concrete heavily corroded; how to mitigate?

I have a decorative concrete column (solid concrete with rebar) in front of a multi-storey house, about 10m hight. Said column is held by three thick steel bars (6 x 2 cm) that link it to the house, ...
2
votes
1answer
69 views

Concrete steps along exterior wall

I'm building concrete steps along the hillside parallel to my exterior wall. Lower part of the wall is concrete foundation and upper part is stucco/felt paper/plywood and wall studs. Part of the steps ...
5
votes
10answers
11k views

How do I secure a canvas garage?

I picked up one of those cheap canvas garages from Costco, to keep a few things out of the weather. It's 10' wide, 20' long, and maybe 11' high at the peak. Our area is a bit prone to windstorms. I'm ...
0
votes
1answer
67 views

Hairline crack in concrete driveway

Should I do anything about this? The crack is about 1/16 inch and four or five feet long and first appeared mid-winter. The driveway was poured just over a year before the crack appeared. I've heard ...
0
votes
2answers
229 views

Is there any way to remove hydraulic cement from a concrete slab without ruining the concrete?

So the previous owners of my house put hydraulic cement along the edges of the wall in the garage and it looks pretty ugly. Is there any way to remove it? I've seen these Portland Cement dissolving ...
3
votes
2answers
661 views

How long to let a concrete walkway cure

I poured a concrete walkway in my back yard three days ago, and I've kept it wet, under plastic since then. Today, I removed the forms, packed sand around the edges (because I had a pile laying around,...
1
vote
1answer
211 views

Water coming through detached garage concrete floor

We have a detached 1954 garage on a concrete slab. The slab is cracked in many places and we get water in it during a heavy rain. Or, during this rainy spring, there's almost always water in it. As it ...
0
votes
1answer
63 views

Are there diamond cup grinder wheels that create a coarse, no slip concrete surface?

I bought a diamond cup grinding wheel for my 4.5" grinder to remove an acrylic stained concrete finish. The cup works great removing the acrylic stain, but it leaves the concrete highly polished and ...
1
vote
2answers
304 views

Can you polish a concrete pier block?

I've been searching google for awhile but can't find a straight answer (every link is about walls/floors): Can I polish (or sand to be smoother at least) a concrete pier block? I have this one from ...
1
vote
0answers
30 views

Sealing leaking cracks in concrete lanai roof that is also an upstairs balcony

First, I want to apologize for the length of this. I like to think I'm a reasonably competent DIYer but this one may be out of my wheelhouse. (and I'm not even sure what type of contractor I'd call ...
0
votes
0answers
51 views

Cement over concrete too smooth surface

I let concrete set too much and tried adding water to smooth. It’s wrecked. Can I pour bagged cement over to fix it. Forms are still in place and it’s just for lawn chairs and people
4
votes
1answer
2k views

Do I use dirt or gravel to fill around a cement form for a fence post?

Background: I know you're not supposed to dig a really wide hole for a fence post hole. But the previous owner of my home did not know that. He or she dug a really wide hole, filled it with a bunch of ...
2
votes
2answers
126 views

Single pole switch with lighting “zones”?

Somewhat of a challenge... I'm going from a single light to recessed lighting in my studio condo. There is a single pole switch that this single light is currently connected to. I'm going to install ...
1
vote
1answer
64 views

How to repair porch slab that has bricks embedded inside it

I have a cracked front porch slab at the front corners where it supports two decorative columns that support a small roof covering the entry door. I discovered that the pillars are on a stack of ...
3
votes
1answer
51 views

Concrete floor surface finishing

My company recently moved into an office, that has an attached warehouse. The warehouse used to be a paint booth, so there is layers and layers of paint and gunk on the floor. It also has a lot of ...
3
votes
1answer
74 views

Temporarily moving 2 walls off of a slab

The very quick backstory is that in order to remain grandfathered to retain my current setbacks (i.e., too close to property line and alley), I must retain those 2 original walls of my garage. I ...
5
votes
7answers
31k views

How long can I store a bag of Quikrete?

I had planned to find a nook in the low-humidity house in which to shove it, but it would be interesting to know how long the bag will keep in various humidities. The main question is: How long can I ...
4
votes
4answers
2k views

How to lift/raise/repair a segment of concrete slab?

I have an 8-year old concrete slab around my pool. One slab has sunk by about 2 inches on the short side. The slab measures about 6 feet by 3 feet by 4 inches. It rests against the pool structure on ...
0
votes
4answers
124 views

Demolishing large concrete patio slabs

My new (1950s) house has large -- e.g., one is 3.5 feet by 8.5 feet by 5 inches -- concrete slabs in our back yard. I'd like to remove them but don't know which tool(s) to use. Could this be done ...
0
votes
1answer
89 views

I have a gap in my concrete window sill, what do I fill it with

What is the correct product to fill this joint with? If I should use a cement based product I do have a can of water plug which I'd rather use than buy a 60 pound bag of something else.
1
vote
2answers
45 views

Foundation next to salt water, on bedrock

I have a cabin next to the salt water and want to build an 8' x 8' extension. The water is 16' away from the cabin at high tide. The cabin is actually on a Tickle that leads out to the ocean...well ...