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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Leveling A Slab With Floor Drains

I just had the slab in my new basement poured about 3 days ago. It turned out terrible. The entire floor is wavy and has up to 1/2 inch dips and bumps every 4 feet or so. I would like to resurface ...
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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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20 views

How should I prepare a concrete slab for plank porcelain tiles?

I have several questions about laying plank porcelain tile on a concrete slab. First do I need to get 100% of the glue from the concrete floor, there are small spots and patches here and there that ...
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34 views

How can I transition from tile to stained concrete?

What are some good ways to transition from tile to stained concrete? We pulled up the carpet that was next to our tile and stained the floor instead of new carpet? I am looking for simple DIY ...
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73 views

How can I remove a parking block from my garage?

So, builders have this thing, for some reason, of installing cement parking blocks a few feet in front of the hot water heater in the garage. I've lived at plenty of places without those and managed ...
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243 views

How to run electrical wire in concrete ceilng?

I live in a condo with popcorn (a.k.a California) ceilings. Next week I'm having them scraped, spackled, and painted smooth. I also want to hang a ceiling light fixture (the dining area desperately ...
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92 views

Can I use a traditional router bit on a small concrete slab? And if no what can I use?

Can I use a traditional router bit on a small concrete slab? And if no what can I use? I'm getting ready to make a coffee table. I know the trick where you put silicone in the corners to achieve a ...
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36 views

Do I need an expansion gap around concrete laid inside a building

We are laying a concrete floor inside a room in an old stone building. Do we need to leave an expansion gap around the edge? The room is open at the front so we are not insulating or anything.
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37 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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38 views

How to remove a brass concrete anchor?

I have brass anchors like below in the concrete deck around my pool. Today, when I was raising the inner screw to install the cover, the screw was being very difficult. Trying to raise it, the inner ...
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17 views

fix for tall concrete steps

I am buying a older home, the back porch steps are concrete and the top step that is just below the porch is extremely low is there a way to add a half step to avoid stepping down so long a distance?
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38 views

Use less water with concrete water reducer?

Reading up on concrete water reducer additives, it says it "reduces water by 5% - 10%". I assume this actually means that it reduces the required amount of water? I.e. I would mix in less water, ...
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66 views

Should I set deck post footings deeply or use concrete footings?

I am building a deck. How about setting 6x6 p.t. posts down on a concrete footing at 4 feet deep (the frost line here) and fill with gravel and soil, and then let the posts run high for the railings? ...
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46 views

How can I grind and smooth a concrete table top?

Hey guys so I just welded up a table and now I am going to make a table top. So here is the problem. I welded the table up and looks square but is off about 2 degrees here and there from heat warpage. ...
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37 views

How to fix concrete delamination

When I made some concrete flooring (my first time doing it) I finished the surface while there was still bleed water (I didn't know it better back then). Now 2 months later in a few areas there is ...
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30 views

How can I repair a crack in my foundation that is leaking?

We need help and we don't know who to contact and how to fix the problem. We have a crack in the foundation. Pavers on one side, crack where the siding of the house is and then water is coming from ...
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4answers
143 views

What is the laziest way I can build a non-structural, non-aesthetic cinder block wall to contain compost?

I have a ton of brush that I used to burn, but I recently bought a chipper/shredder and want a spot to compost it along with grass clippings and greens. I also have 3 tons of CMUs that are just ...
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75 views

How do I shave down a sidewalk?

I have a sidewalk where one of the sections that was repaired by a previous homeowner is raised up above the surrounding sections. I've seen some sites on the internet talking about shaving down the ...
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104 views

How do weather conditions affect pouring a concrete foundation?

I'd like to understand how weather conditions affect pouring a concrete foundation. Are there concerns about pouring a foundation during cold, snowy, rainy, or otherwise inclement weather? Is it ...
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43 views

Can I use a toggle bolt if there's no space behind the drywall?

While trying to install a 14lb metal shelf to the wall, I had learned from a previous installation mishap to upgrade from plastic anchors to something stronger. I picked up a few toggle bots (3/16" w ...
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42 views

Types of floats and trowels for concrete

In Brazil there are basically 3 kinds of floats: Steel (in many shapes), used for smooth finish concrete, spreading mortar for tiles, plastering, etc. Wood (rectangular) used for rougher finish of ...
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29 views

Connect new footings to old footings

I have a 7 foot section of an addition that has no footing. It is a square addition, so 3 walls on the back of the house. It is about 13 x 12. One of the side walls is missing about 7' of footing and ...
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55 views

How to indentify if the crack on plastered brickwalls is cosmetic or structural?

First up, I understand these kind of things are best left to experts' inspection and internet forums won't help much. I have called an engineer but until he arrives in a day or two, for my solace, I ...
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73 views

Drilled a shallow hole in concrete ceiling and some water came out. What now?

We are on a ground floor of a condo building and to put up the partitions I drilled a small hole and after about 1" depth the drill fell into a void (about 1" more) and about a quart or so of clear ...
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How do I remove adhesive from outdoor concrete deck that is textured?

I have an outdoor deck that had the old green carpet truf glued down. I removed it some time ago and want to remove the adhesive from the concrete, it has the brushed finish so the adhesive is in the ...
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59 views

How water proof is concrete?

I'm looking to buy living quarters in this basement level apartment. The only doubts I have are because some ~5 years ago, there was a giant flood in the city and had this building been couple blocks ...
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Which should I do first? replacing furnace or resurfacing concrete floor?

I'm going to get two things done in my basement soon (by hiring professionals), but I'm wondering what the right order of operations is. One task is to replace the gas furnace that sits near the ...
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49 views

How to form curved concrete seat for bench with back?

The contractor seems very unsure of procedure. He has put some very thin plastic around the front edge of the curve, holding it in place with wide black plastic tape. It is about 1.5 inches tall. ...
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41 views

Dig out some remaining rotted post or just pour in cement [closed]

Will concrete harden although some rotted wood is still in hole?
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76 views

How big a hole do I have to drill in concrete to embed rebar in it?

I have a concrete patio that I'd like to use as the foundation for a CMU wall. I'd like the CMUs to be tied into the patio slab with rebar. I get that the gist is to drill a hole in the slab, put ...
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91 views

Why would cinder blocks be used instead of concrete for a foundation wall?

Saw this video about how to properly lay bricks and dang! It takes more skill and care than I thought. Then I saw a video about how foundations are poured into wooden casts from a big concrete truck ...
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163 views

How realistic is lowering a concrete floor?

So first off, I love basements, its almost like a fetish. Ook.. so this guy is selling a basement in his building and its perfect(got good water, electricity, comms, location and cheap!) except for ...
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110 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 loom of stained concrete. We have a crawl space underneath. My question is what product do I use? How thick so it ...
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244 views

How to repair garage floor concrete damage near apron?

I have a concrete garage floor that is cracking near the apron entry at the overhead door. I'd like to understand how to repair this problem and if it's a project I can handle as a DIY-savvy person ...
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35 views

Seamless construction joints on concrete floor

By construction joints I mean the joints between a batch of floor made one day and the new work in a following day. What is the proper way to get the most seamless joints when making finished concrete ...
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329 views

Is it possible to use molly bolts in concrete?

Is it possible to use molly bolts in concrete? They are generally described as for use in drywall. But I have a project that needs a hook or screw to be taken out from time to time, which is possible ...
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43 views

Wall frame weirdness during renovations

so I am renovating my garage and noticed something in 2 spots along the frame when ripping down the drywall. Here is a photo: The walls of the garage have stood for many many years without major ...
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110 views

Few questions about concrete/cement wall inside of the apartment and which screws to use

I live in an apartment building that has concrete/cement walls. I am still not sure which one it is. I included the image which has the wall in the background. I would like to know which screws i ...
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196 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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94 views

How much concrete is required to hold 125 lbs/sqft permanently?

I have an garage with asphalt floor and concrete footings. I plan to put a 500 lb safe in the corner, partially on the footing. That's about 125 lbs per square foot including contents, permanently. ...
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38 views

What should I do about cracks in the cement pan for a roll-in shower?

We are installing a roll-in shower. We poured the floor and after 2 days it has several cracks in it. I am not sure if they are all the way through. Is there any way to fix this or do we have to ...
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39 views

How long will stored powder charges last?

I finished a basement well over a decade ago, and had leftover concrete nails and powder charges for my powder actuated nail gun. I'm going to be driving a few nails into concrete for a tack strip, ...
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65 views

repairing concrete damaged by anchors

I was trying to mount something to a concrete wall and completely botched it. I had 4 drop-in anchors, so I took a hammer drill and some bits that were, by eye, pretty close to the diameter of the ...
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43 views

Large gap between foundation wall and patio

What is the best way to full this gap which is between the foundation wall and front patio?
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163 views

Gutted a basement and found a window, what should I do?

I recently gutted my basement in an early 1900s home that was finished in the mid-80s, and discovered a window! This window is directly under my front door, hidden by a deck that I've never really ...
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54 views

Can I put gypsum and paint finish on top of a concrete fast set repair mortar?

I have a finished concert pillar in my living room that I need to be patched and pained. The pillar has final gypsum and paint on top of concrete. Since the concrete is chipped off I need to use a ...
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49 views

How to mix concrete cement

How do i make sure i have the right air in concrete cement if i'm mixing at home.So that the concrete is stronger and won't crack in cold winters. I'm pouring a small walk way about a meter of ...
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96 views

What is the name of extremely porous concrete for water runoff solutions?

I have seen extremely porous concrete that water drains through very well. Narrow strips of this may be put across a driveway to limit excess water runoff. What is the name of extremely porous ...
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72 views

Extremely porous concrete to act as water drain?

Want to create a six to twelve inch wide porous concrete strip about thirty feet long in our backyard over a drain pipe. Normal concrete is porous but the concrete i want is extremely porous. So ...
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How can I get concrete out of ground?

I had a huge play structure when the kids were little that I donated to a church camp. When they picked it up they just cut the brackets at the ground and left the concrete and 6 inch U brackets ...