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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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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28 views

Rebar Spacing in a concrete footer

I have some rotting timber retaining walls that were built between boulders. I want to replace them by pouring concrete footers and stacking CMU blocks. I also want to add some rebar to help ...
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15 views

Fixing foundation crack with repair kits

I have a crack in the foundation visible on both sides, interior and exterior on an older home (built in 60's). In my case the foundation does not seem to be sagging. I have received some advice ...
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22 views

How do you refinish a concrete countertop?

I have concrete countertops in my kitchen that, unfortunately, weren't sealed properly. They quickly began picking up stains from water, so the contractor that made them took them back and somehow ...
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1answer
48 views

How to minimise the amount of concrete needed for a shed foundation?

I’m looking to build a 6m by 3m shed in the back garden. It will be jammed in between 3 neighbours’ gardens, so it will have to be less than 2.5m high. Roof will most likely be a low grade pitch with ...
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1k views

Pure concrete hollow cylinder

My intention is to build a hollow concrete cylinder for a fire pit like this: There are a few people who have done this by using steel sheets bent in to shape with supports between, but I would ...
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2answers
209 views

Please reassure me about basement french drains

I understand the principles and practice of putting in a basement perimeter drain... but I've got a slightly irrational paranoia about the concept of cutting the basement floor free that way. ...
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32 views

Kerb concrete slab

I'm thinking of using some kerbing to retain a small mound of earth from falling onto a new concrete slab drive. But I'm not sure whether to add the kerb before or after laying the concrete slab. If ...
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59 views

why is there a concrete pole in my wall?

I broke open a section of wall I'd like to remove and there is a concrete pole inside!? Is this some kind of load bearing device? How can I know if I can remove it? Thanks
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19 views

How to seal joint between stone foundation wall and conrete cellar floor

In my 1910 vintage Baltimore row house, the concrete cellar floor was laid after the construction of the house. The joint between the irregular surface of the stone foundation wall and the concrete ...
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76 views

Can a regular rasp be used to enlarge a hole in concrete?

I need to enlarge a few holes from 40mm to 50mm in a cinder block wall and in a concrete beam. Chiseling will do much damage and need patching, can I rasp it with a wood rasp?
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21 views

What primer should we use on a previously painted concrete wall?

We are preparing to prime and paint over previously painted interior concrete walls. The walls have oil residue (from an oil furnace) that is embedded in the rough surface and we were unable to fully ...
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67 views

This hole in a concrete porch needs fixing

I might buy this house and have never lived there. The porch has an big air space of maybe 4 feet underneath the slab. Some of the rebar at the bottom edge of the slab is visible when peering in. The ...
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38 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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29 views

How do I finish a concrete floorÉ

My basement has a concrete floor that is all jagged. It`s missing about 1 1/2 inches of concrete to be even with everything else....what do I do?? Will self-leveling cement adhere to such a ...
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3answers
275 views

How to get water to hop from patio over brick wall?

I have a concrete patio elevated a few feet above the lawn. The patio is bordered by a brick wall (on 3 sides, with the house on the 4th) that extends higher than the top of the concrete of the patio ...
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57 views

How to fix a sewer pipe leak in a prefab concrete floor

My house is built with prefab concrete slabs for walls and floors. These have been prefabricated with most of the plumbing and electricity tubes pre- installed inside the concrete. While redoing the ...
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2answers
106 views

What's the proper way to fill this hole?

Recently a dip formed in our flooring inside our sports performance training facility. We discovered that the concrete job there had a good number of stones in it, and I believe that it was that ...
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1answer
30 views

How do I pour concrete in an existing garage?

My garage had extremely poor flooring. I've removed it and dug down 11". I plan to use a plate compactor on the dirt, add 4" of crushed rock, compact that, add 2" of sand, wet that, wait for it to dry ...
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71 views

Adding rebar to deck footings and piers?

I've heard a few people mention adding rebar to deck footings and piers to make them stronger, but I haven't been able to find any details on how exactly to do this. Is it sufficient to just hammer ...
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1answer
54 views

Is there a way to find rebar in concrete walls?

I was wondering if there is a way to find the tie rods and also plastic electrical conduit in concrete walls. In Ecuador all walls are made from poured concrete and plastic conduit is run. But it all ...
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3answers
673 views

How will concrete fill in?

So I am pouring some footings for a deck I am building and my current plan is to dig a hole that is 18" wide and 18" deep. I'm then going to suspend a sonotube about 6 inches above the bottom (using ...
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1answer
62 views

How long will Concrete bond together when poured over multiple days?

I've heard / read references to concrete being poured over 2+ days becoming "bonded" but I can't find any details to what the longest you can wait is. What is the longest you can wait between pours ...
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1answer
61 views

How should I fill in pits in a concrete floor so I can install laminate?

I have these holes in the concrete floor, and I want to install laminate floor. What can I do to fill in these holes to get a nice level surface.
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39 views

What timber to use for formwork or shuttering concrete base

What type of timber would you use to construct the formwork (shuttering). There seems to be 4 different types that I could use. Planed Sawn Untreated Sawn Treated Carcassing My particular ...
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54 views

Installing a door threshold on concrete slab

I am trying to install the following door threshold on a concrete slab. The door leads outside and the old threshold was rotted from water penetration. The following pictures show the concrete ...
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24 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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35 views

Attaching a deck ledger to the concrete pad of a detached garage

I am building a deck between my house and the garage. I will support the deck on one side with a ledger on the house and plan to support the other side with a ledger on the garage (with requisite ...
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2answers
58 views

What type of contractor would I hire to level a concrete floor?

I am doing some renovations, and I've recently uncovered an original concrete floor that I would like to have leveled for carpet to be installed. It's currently sloped from level with the adjoining ...
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2answers
62 views

Mix a bag of 25KG self-leveling concrete with 6L of water?

I bought a 24L bucket to fit the mix of 25KG of self-leveling concrete (Thomsit DD+) and 6L of water. Now, visually inspecting the thing, I can't really tell if it's large enough to handle the amount. ...
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3answers
82 views

Installing hook on strange wall

I need to install some hooks on my wall, which I plan to use to perform elastic band exercises. Hence, I need to install these very well so that they will handle the stress properly. Situation is I ...
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1answer
31 views

What kind of precautions should I undertake to use epoxy-based paints?

I see on the market floor paints made from "1-part epoxy" or from "2-part epoxy". They are meant for concrete floors. Epoxy is reputed to be very harmful if misused during construction. Anecdotes ...
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40 views

How can I refinish a basement concrete floor?

The basement concrete floor pictured has traces of red paint, a beige mesh, the concrete itself, and a top blue-gray layer of paint. Does refinishing the floor require reapplying the red and the ...
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67 views

How can I level a part of a concrete floor in preparation for installing a washing machine?

Whoever installed the existing washing machine in the basement was unable to extend one of the legs long enough to adjust for the slope in the concrete floor. So they took a piece of wood and stuck ...
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22 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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45 views

Hole in concrete floor from floor anchor

I have a small hole in my basement floor from a leftover floor anchor similar to http://www.lowes.com/pd_79553-2191-50098___?productId=3044000. The anchor is now gone, and apparently over the years ...
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60 views

container liner for easy cleaning when mixing concrete

Whether its a wheelbarrow or a 5 gallon bucket, is it okay to use a liner? For example, put liner in container, mix concrete, pour concrete, pull out liner, dispose liner, squeaky clean ...
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141 views

6in vs 4.5in of concrete for driveway

We need to get our cracked concrete driveway replaced. The damage seems to be a result of tree roots, and the tree has has been removed. Many people who we've spoken to say the concrete should be ...
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1answer
49 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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Pouring concrete, is it safe to add large rocks to increase volume?

Backround I'm going to pour some concrete to anchor a swing set. The base of the swing set that is being anchored is two 4x4s with a 2x4 footer crossed perpendicularly to the 4x4s. I have a bunch of ...
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2answers
95 views

How do i resurface my concrete patio?

I'm trying to figure out the most cost effective way to repair my concrete patio. It survived for about 30 years but recently a portion of it has begun spalling pretty bad, so bad you cant really sit ...
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30 views

Can concrete demo material be used as fill behind same project?

I am demolishing the old outdoor steps at the rear of my house, built circa 1955. I have discovered that they are not constructed on the ground surface, but sit upon a concrete block structure about 4 ...
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Putting footer with slab question [duplicate]

I wanted to put 4 footers where post will go for a pavilion. Should the footers be flush with the slab, or should I leave an inch for the slab to be poured on top . I'm going to have a 4 inch slab. ...
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1answer
59 views

Cracks in a newly constrcuted basement wall?

Pic 1 shows the newly constructed basement (Just 4 days) wall and It can clearly seen the crack across the wall (Not sure whether its crack or not but looks like) due to pouring concrete. I wonder ...
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55 views

Can I use mortar to roughly level a basement floor for workshop?

I recently got my foundation repaired and am left with a very cracked and uneven concrete floor next to the wall. Along the very edge any leveling compound would be at least an inch deep. All I plan ...
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1answer
35 views

How to prevent Epoxy from sagging/dripping

I have to anchor a bolt to concrete, but I can only find 2 component epoxy in "medium viscosity" around here (Brazil). I made a test setup to see how much might drip out and it is much more than i ...
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4answers
125 views

Concrete driveway in New England?

I need a new driveway and I was wondering if my only option is asphalt? I'm in Connecticut - does anyone know if I can have concrete driveway?
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1answer
41 views

putting concrete footer with slab

I am going to install a pavilion on a concrete slab. I was wondering, if I install 4 ft concrete footers, should the top of the column be flush with the top of the slab to be poured, or the column be ...
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28 views

how to lay concrete agaisnt wall over buiried foundation concrete

i want to lay concrete out of backyard along cinderblock wall over existing concrete foundation of backyard wall and gate. the existing foundation concrete is about 3 to 4 inches below the top of ...
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4answers
140 views

Can a concrete porch be poured against a stone wall?

I am installing concretes porches in the front and rear of my home to replace wooden decks. The front exterior wall is stone and the new porch would extend up over the stone wall at the bottom. ...