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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Should I move this support post in my basement?

I am trying to create a new bedroom in the basement. The first problem I hit is that there is this short concrete "wall" with a post coming out of it. Actually, the post is 3 2x4's joined together. ...
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38 views

How to install bathtub

I want to install a tub on basement bath where drain pipes are already installed and sticking out from concrete floor. I need to know how to raise the level of the tub from the floor in order to have ...
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What kind of paint should be used on an outdoor concrete walkway?

I have an outdoor walkway that was freshly painted just before I bought my house two years ago. Two winters have worn down the paint and now it needs another coat or the exposed concrete will crumble. ...
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1answer
60 views

Can I rest cement posts directly on the bedrock to build a structure for a large shed?

So I live in Canada, where winters are cold, and where there's not much soil above the bedrock. I would like to build a sturdy structure for an existing "shed" (in fact a 100-year old former stable or ...
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22 views

Replacing Kool decking

I want to replace my cracked and bumpy Kool deck. What do I need to do to take it completely off my pool deck?
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4answers
5k views

How can I prepare this concrete floor for tile?

I'm looking to replace an old carpet in my finished basement with tile. I've removed the carpet and found a surface with some peeling paint, which I've read needs to be removed since the thinset for ...
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1answer
59 views

What type of concrete foundation do you pour for sand?

I have a piece of beach front land that is sand (sometimes wet), what kind of foundation do you pour for a home constructed on sand? What kind of considerations do you take in if its water front and ...
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1answer
6k views

Are there any advantages to using metal post spikes set in concrete when building a privacy fence?

My neighbor and I are considering alternatives to wood-in-concrete fence posts for a privacy fence that can have significant wind load in an area that gets up to -30 degree frosts in winter. The ...
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2answers
885 views

How do I fix sticky KILZ primer?

Has anyone ever had problems with an oil-based primer like KILZ being sticky or not drying correctly? We removed some vinyl tiles and mastic from a basement laundry room floor (concrete) using ...
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Do I really need to use primer when painting an unfinished concrete floor?

I'm turning a one car garage into an office and want to paint the floor. I bought some Behr concrete paint, and the guy at Home Depot insisted that I have to put down a layer of primer first. Do I ...
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147 views

Which type of mortar or cement to set electrical box?

I have cut out two holes for 4", metal electrical boxes to be set in to the exterior walls of an old block and stucco garage. I need to secure the boxes by setting them in either concrete or mortar, ...
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Do I have to remove the old thinset before installing new tile?

I will be installing some new 12x12 tiles in two bathrooms approx 25 sq/ft each. When I pulled up the old tiles, there was no thin set that had made contact with them so the removal was very easy. ...
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55 views

Is it possible to create a 4“x4” channel through concrete using acid?

I'm trying to figure out a possible way to eat through concrete without damage pex tubing inside (its a radiant heated slab). Is there any way using some type of acid (hydrofluoric, muriatic ) to eat ...
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1answer
31 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 which does not have a gutter. As a result I have a musty smell in my house. I bought some UGL DRYLOK ...
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4answers
36k views

What water:cement:sand ratio gives the strongest mortar?

A typical mortar mix ratio is 1 cement : 3 sand. But what is the water ratio? Is it 0.5:1:3? Would a 0.5:1:2 ratio be a stronger mortar? Our next door neighbor has a dog that digs like a pro. The ...
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Can I pin 1/4" wonderboard backerboard to the whole concrete blocks wall in bathroom?

The bathroom is in the condo, high-rising concrete building. The two side walls are diamond wire mesh with applied above the cement (grey) and lime (plaster) layers , total depth 3/4". The frontal ...
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1answer
81 views

Deck Footing capacity with BigFoot base

I'm planning a new deck (completely replacing and enlarging an existing deck). The deck will be 25'x15' w/25 ft being attached to the house. I'm trying to determine what footings are required. ...
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1answer
53 views

A-Frame for a hoist?

I need to move a heavy-ish piece of concrete, a part of a garden sculpture, weighing about 300lbs, to about chest height. I'd like a hoist, but don't know the equipment I'd need to assemble an ...
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1answer
68 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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2answers
110 views

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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3answers
132 views

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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41 views

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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1answer
47 views

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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1answer
148 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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6answers
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What is the best way to remove and prevent leaf stains on concrete pavers?

We have a brand new paver stone walkway/patio. To my dismay, I noticed that their were leaf and acorn stains from the oak tree in the front yard. I've learned my lesson and I'm going to try to keep ...
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1answer
44 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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83 views

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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1answer
361 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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1answer
60 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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41 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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1answer
90 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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118 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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1answer
53 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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3answers
694 views

What is an appropriate sealer for a Papercrete bench?

I've built a bench out of tires and papercrete two years ago. i've sealed it with lime plaster. in the past two years it held up against 500 m"m of rain in the winter and Mediterranean sun 7 month ...
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2answers
542 views

How do I repair this damage to my driveway?

After the brutal winter, my wife and I found several locations on our driveway where the concrete is crumbling. This is the worst of them: In the past, I have used self-leveling concrete caulk ...
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1answer
285 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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2answers
115 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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3answers
2k views

Should I use self leveling concrete to repair settlement cracked concrete slabs?

I have a concrete slab in the breezeway of my house that has several settlement cracks in it. Can I use self-leveling concrete to repair this?
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1answer
106 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
539 views

Will using concrete anchors in wall studs cause problems?

While installing a wall mount for a 48" TV, I realized I made a mistake. I drilled a ⅜ pilot hole in the wall stud and then installed the anchors provided with the mount that the lag bolts would be ...
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79 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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1answer
63 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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2answers
107 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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2answers
140 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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3answers
31k views

How can I repair the cool deck around the pool?

In places around the pool the cool deck has flaked off and I can see the bare concrete. The previous owner tried to patch it in places but it looks horrible because the texture AND color don't match. ...
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14 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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1answer
213 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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0answers
51 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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1answer
45 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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2answers
114 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 ...