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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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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56 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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28 views

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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37 views

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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33 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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583 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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24 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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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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40 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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78 views

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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81 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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1answer
134 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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127 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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55 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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35 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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74 views

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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93 views

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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11 views

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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35 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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1answer
93 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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36 views

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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29 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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80 views

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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57 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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67 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 ...
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54 views

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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26 views

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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85 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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31 views

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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157 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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141 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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2answers
156 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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1answer
84 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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142 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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216 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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99 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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1answer
114 views

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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51 views

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 ...
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3answers
135 views

Need advice to prevent runoff water from going into neighbor's yard

I'm looking for some advice on what I can do to prevent runoff water from going into my neighbor's yard. I am an auto detailer so I am constantly washing cars in my driveway. The neighbor also parks ...
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122 views

Fill / waterproof large crack / gap in concrete garage floor

Moved into this house about two years ago. In very heavy rain, the backyard floods due to inadequate drainage, and it runs into the garage, under the wall. I used a Concrete Crack Filler ...
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23 views

Repairing concrete block on inner part of basement

I have had water seepage into my basement through concrete block for many years. The exterior part of the block is covered by a deck and patio and is not easy to get to. I've mitigated a lot of the ...
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58 views

Installing an 18kg (40lb) projector screen onto a concrete ceiling

I have a large projection screen that I need to install into a (seemingly) pretty stable concrete ceiling -- at least that's what I assume it is -- it sounds very solid when hit with a hammer, ...
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1answer
57 views

Best way to remove anchors from concrete?

The people we purchased our home from put up a wall in the 3 car garage between the 1st and 2nd space, but never finished it and I am now looking to remove the entire wall. There are several ...
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2answers
117 views

Is the proposed solution to this masonry project okay?

We will going to build long interior, round(little bit) shaped staircase (similar to this) from concrete, and I needed to get instructions with physics that it will possible to make it without any ...