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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Insulating the concrete columns

we are building a house with bricks and it has columns every 3 meters. Wall is going to be insulated with foam blocks and I am trying to figure out how to insulate the columns. Will putting a 2 - 3 mm ...
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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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How to put up a very small barrier on concrete to stop water running past it

I have a a concrete driveway that leads to the garage with a very slight slope towards the garage. When it really rains hard, the water comes down into the garage. I don't want a very high barrier, ...
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concrete drive heaves where it meets garage floor

This past winter, my concrete driveway heaved 1.5" above where it meets the garage floor. It is three years old. Also, we dug along the sides of the drive to try to guage if a 4" slab was actually ...
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how can I check to see if a 4" slab of concrete was actually poured?

I had a driveway poured three years ago. After a crack in the walkway appeared and two more developed in the driveway itself, my husband began to get suspicious that I wasn't given a 4" slab. If we ...
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40 views

How tall can I go above ground with a concrete footing?

I am building a 20' x 20' foot deck with a 10' x 12' Pavilion in one corner, away from the house.I need the concrete footings for the pavilion to be flush or just above the surface of the deck. There ...
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131 views

What is this crystal on my concrete?

My concrete has an old unknown spill which appears in the newly warm moist weather to be forming crystals or hairs. It doesn't have direct water on it, and hasn't been damp recently. What is the ...
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30 views

How do I shim a steel structure?

I need to affix my steel stringers to a concrete beam. Since the beam was poorly executed, it is not plumb. On this piece I will weld some 5 mm thick plate on the backing, that will have holes for ...
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Do I need a header for an egress window?

I am in the process of finishing a bedroom in my basement. I need to add a window to the room and the selected wall is poured concrete. I need to know if I have to add a header above the window in the ...
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22 views

Damp slab in my living room

I live in Fl and have a damp area on my slab in my living room in front of my front bay window I dont have a gutter and as a result I have a musty smell in my house. I had bought some UGL DRYLOK ...
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57 views

How can I remove 6-8 inches of concrete from a wooden floor?

I have inherited a 143 year old building. Somewhere in the past someone poured 6 to 8 inches of concrete over top the wood bathroom floor. I really want the weight out of the building. Any ideas on ...
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Concrete caulk vs expanding polyurethane crack sealant

I'm starting to finish my basement. First step is sealing up some various places water has come in over the years. I've already fixed grading outside, but also want to seal inside. I have one crack ...
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Help! enclosed porch/sunroom foundation

We just purchased a home and now that the snow level is not 4 feet high ( we live in central NY ) we see that the concrete patio/foundation has horizontal cracks, and crumbling along the side, corner ...
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34 views

What should I do with a large gap in a concrete floor

The grout in the tile has cracked or separated all the way across the house from one side to the other. I figured it was normal due to settling. In the kitchen it has become really bad, to the point ...
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597 views

Can I mix latex paint into concrete

would like to color concrete mix can I use outdoor latex paint to mix in with the concrete?
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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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35 views

Are there any penetrating sealers for concrete countertops that will darken the color?

I am in the process of grinding and polishing a pour-in-place concrete countertop. When I am done, I want to seal with a penetrating sealer. I don't want a surface epoxy or wax sealer. I like the ...
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44 views

Repainting my lanai floor

I'm painting my lanai floor and it has been painted last year but changing the color. Did one area and let it dry 24hr. and I can scratch it off/ I used the paint Home Depot sold me for concrete. What ...
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What's the proper way to address a moisture issue in a concrete slab?

About 4 years ago my wife & I purchased a home. It was approximately 10 years old at that time. The foundation is a concrete slab. Approximately 2-3 years before we purchased the house, the ...
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83 views

What can I do about this deteriorating staircase?

The side entrance stairs to my home are deteriorating. They appear to be several different patches, coats and possibly capped concrete. I have a temporary fix lined up to make it safe for travel. My ...
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165 views

How should I extend a concrete patio under an existing deck?

I have a 18x20 second floor deck with three 6x6 support posts. Under the deck is a 40-year-old, well-settled, 12x20x6" concrete patio. The deck posts are set outside of the patio, set on footings ...
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133 views

How to fake this concrete effect with paint?

I'm attempting to imitate this concrete wall (at least I think it's real concrete!), using acrylic paint. For my initial attempt I was thinking of working with two grays (one slightly lighter) - ...
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59 views

What should I do with tree root upheaval in front of my drive way?

I have noticed an issue in front of my drive way. On the left side of my house, one of concrete slabs has been lifted by tree roots. The problem seems to get worse as time goes on. I am living in a ...
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37 views

How can I close off a toilet drain in a concrete floor

I want to remove the toilet and turn the bathroom into a laundry room. How can I close off the drain?
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What type of subfloor should be used for Engineered hardwood flooring installed on grade concrete slab?

I would like to install engineered hardwood flooring over a concrete slab which is on grade. It is the first floor of the house, there is no basement and the house was built in the 1990's. I have seen ...
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How can I stop a porch crack from causing internal cracking?

My front porch slab has cracked and part is at least an inch lower. It is supporting the roof. Now there is a crack going up the inside of my drywall at the same place. Suggestions on how to solve ...
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concrete stain protection

I want to make a shelf (floor standing) out of concrete, to surround our sofa, so that we can put cups/win glasses on it, and a wine rack underneath. I have done some experiments with the concrete, ...
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38 views

Remove paint from concrete floor (indoors)

I'm trying to find a solution to prep my concrete floors (slab) for tile. A contractor I had hired to remodel my home did an outstanding painting job -- so well that he managed to cover most of my ...
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100 views

What is recommended method to fix sunken garage floor slab?

I have an attached one car garage where the floor slab seems to have sunken in one corner by about an inch and a half and varies lesser amounts in other areas. The slabs continues behind the garage ...
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48 views

Where to seam concrete countertop?

I'm looking to do a concrete countertop and would like some advice on where to make the seams.I was thinking either where the red or the yellow lines are. Thanks, greg
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How can I figure out how much load a concretet slab can take?

I have a sun room that has existed for around 12 years. It is on a concrete slab, with two retaining walls and a 2x4 wall structure for holding screens. I want to convert it to a enclosed room with ...
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31 views

When to use concrete plasticizer

When should one use a concrete plasticizer? Should it be used for internal floor slab?
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What can I do about my deteriorating basement floor with a large hole that seems to go right through to clay?

We live in 90 year old house with an unfinished basement. I've been working on removing a lot of the crap that the previous owner did, and removing a lot of concrete debris. Then I ran into this ...
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58 views

How can I remedy moisture intrusion from my concrete slab?

We bought a house a little over a year ago. The old carport had been converted into a den. It had musty, dirty carpet, so we ripped it out. A big problem we ran into is that we live in west Tennessee ...
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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 ...
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Self levelling concrete as primary floor?

My kitchen currently has a concrete floor with a bit of underlay and then some funky blue vinyl on top of that. A new kitchen is going in Q1 this year and I'd quite like the look of concrete floors. ...
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I need to Improve drainage in croncrete

I have greyhound kennels. Built them brand new the concreter was a moron and the fall is everyway except towards the drains, I was wondering If it's oossoble to cut a small trench to squeegee water ...
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88 views

How to fill hole in slab after installing new closet flange

The plumber broke up some of the slab, removed an old cast iron Y and put in a new elbow and closet flange. He left back filling and patching the slab to me (my choice). The edge of the hole is ...
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concrete and slate roof has started to leak

I have a house with a concrete roof with slates stuck on it (probably using gypsum). The roof is pitched, I would guess somewhere around 20 degrees. It has started to leak in a few locations. Can ...
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163 views

What can I do about a house with internal concrete floor with no DPM?

My partner and I have just bought our first home.A 1950's bungalow which is need of refurbishment. So far it has thrown us a ton of surprises! The worst so far being the floor in one of the bedrooms. ...
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146 views

Should I patch this hole in my slab?

I'm in the process of tearing out carpet and installing laminate in my guest bedroom. After I got the carpet out, I discovered a hole several inches across underneath the wall that borders the garage. ...
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160 views

Is it okay to build a fire pit with concrete?

I want to put a small fire pit (3ft x 3ft) into backyard. I checked the stone options at home depot & lowes and just the material will cost around $250. I was thinking about building a mold and ...
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85 views

Temporary floor fix - Ikea laminate on concrete and wooden boards

I've just bought my first home and have started the long-term and rather daunting task of getting it into a decent state. First on my list is the Kitchen floor. See photo below. I pulled up the smelly ...
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156 views

How to hang a projector screen from a thin horizontal part of slightly curved ceiling

I have a brick wall in front of which I want to hang a projector screen. Here is an image of a typical projector screen that I am looking to buy: The part of my ceiling near the wall is curved(the ...
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41 views

Extending the back of our house

We are going to be replacing our entire roof with a metal roof this summer. I was wondering if it would be possible to extend the back of our house before we put on the new roof. We would have to pour ...
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230 views

Concrete foundation repair

My home was built in 1914 (Portland, Oregon). In 1948, the house was moved 200 feet to its current location. The 750 square foot house has a concrete basement with a concrete floor. The concrete ...
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103 views

How to waterproof metalic electrical conduit entrance in concrete wall?

I have concrete garage inside the hill below house level. Electrical metal conduit runs underground and enters the garage at the top of concrete wall. It may 12"-15" below surface. See pictures. It's ...
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Running irrigation pipes under a large concrete pad

I'm planning on redoing the irrigation system in the back yard and considering extending it to cover the front yard as well. My only problem, the house is completely surrounded by a concrete patio. ...
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Water heater on concrete--should I build a platform? how much heat loss in winter?

I don't know if that title the best way to phrase the question. It's winter(ish) now, and I swear the hot water just doesn't last as long as it does in, say, September. The water heater tank is ...
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Concrete shows under hearth, can I paint?

My hearth has been laid on concrete which stands proud of the floor. The hearth is black and the concrete has a black cement dye in it but looks grey next to the black of the hearth. It has a fairly ...