Questions tagged [concrete]

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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27 views

When would you use “hot mud” or setting joint compound for leveling concrete?

To my surprise (or ignorance) the bag of 'hot mud' I bought specifically says it can be used for : leveling interior above grade concrete When would this be an appropriate choice, and does it have ...
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15k views

How do I reduce height of the curb on my driveway?

I have a concrete driveway (normal 2 car poured driveway) which is cut vertically (90 degrees) about 2.5 inches above the street. My father-in-law lives with us and has a powered wheelchair. The ...
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444 views

Should a concrete curb at a patio door be built on top of or inset into the slab?

This is going to be hard to explain, so please bear with me. I am shrinking down an old 8' sliding glass door Rough opening from what appears to have been an old garage door originally. The header ...
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Guidelines for poured concrete over corrugated metal

It seems common in some commercial construction to use corrugated steel plates to form a 'deck' surface which concrete is later poured onto. The combined steel/concrete then forms a very strong floor ...
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Can I tile over white paint?

Through out the house there is this white substance on the concrete that looks similar to white paint. There use to be carpet with the first owner of the house hence the brown glue, and then there was ...
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cracks in concrete walls in garage

I live in a high-rench type of house, where garage is on the lower level. The walls are concrete, and I found long crack running along the corner (see attached photo). The house is not in a wet/damp ...
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574 views

Need help installing the pull up bar i just bought

i am a rookie that hasnt done much installing/drilling etc. in my life (just turned 18 ;P). So i bought this pull up bar online, assembled it, but now i have to install it to my wall. At first i ...
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67 views

How can I remove paint splatters from sealed decorative concrete deck?

I have a custom concrete pation & pool deck that is textured / painted to look like wood. It is also sealed. Recently I had the coping on my pool fixed and the guy did a great job but left quite a ...
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78 views

Are phosphate floor screws suitable for subfloor which will be covered in thinset and cement board?

I am installing hardiebacker concrete board with thinset to a plywood subfloor. I am putting down the new subfloor and want to be sure the screws that I use to secure the plywood to the joists will ...
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2k views

How to determine if drill is suitable for concrete?

I've seen two drills - one 600W the other 700W. Both 0-3000 rpm. But for 600W some guy said it can't make it with concrete, while for 700W reviews say that it does it. Both are hammer drills. I'm not ...
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994 views

Are there any advantages to using higher priced sealers?

I want to use a water based sealer on my pavers to bring out the color and also for some resistance against dirt and fading. I went to the store and saw sealers varying in price from about $11 per ...
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345 views

Concrete stairs substrate preparation and layering

I need to pour small stair entry into my basement, about 4 steps and it is narrow, with a brick retention wall on both sides. I was going to first evenly grade and pack the dirt, then put gravel, ...
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What could cause a wet soil / moisture smell on concrete slab

I have a wet soil smell coming from the living room concrete slab. I had to remove all the tile in the leaving room. A remediation company came, they removed the drywall and dehumidified the place, ...
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37 views

Process and product to fix concrete slab surface issues prior to framing over them?

I have some issues with the slab that was poured for a garage, and I need to frame an interior wall over a bad area. The slab was poured with a bit too much water (5.5 slump) on a hot day in July. I ...
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46 views

Hit metal piece while drilling through condo concrete ceiling

I am trying to install wide rectangular light fixture. Something similar to this: https://www.amazon.ca/Feit-Rectangle-Ceiling-Lighting-Diffused/dp/B00Y86OROW I Hit a metal piece while drilling ...
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46 views

Filling crack in outside concrete path

Is there some DIY way I can fill up the cracks in the concrete path outside my home without having to go and hire professionals? See picture for how the crack looks like.
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156 views

How can I mount a railing in concrete steps when I encounter rebar in the hole?

I need to install a handrail in concrete steps. The problem is that after drilling ~2" (5 cm) down into the concrete, the drill bit wouldn't go any further. I suspect I'm hitting rebar. This is about ...
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50 views

Diameter of an 11' foot high, 3" (2&7/8) steel post footer hole

I know that the general standard for post footers is to make the diameter of the footer hole 3 times wider than the post itself. However, I want to make sure that even in an 11' foot post (which seems ...
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863 views

Is a home with concrete walls more likely to propagate noise between floors?

I have a house and it has three floors. All of these floors and walls are made of concrete. So my question is, whenever the third floor makes noises, e.g. noises from music, carpentry tools like ...
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110 views

Wire mesh or rebar

I am extending my back patio and am planning on reinforcing the new slab. I live in South Louisiana. Should I use wire mesh or rebar for this?
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63 views

tile over concrete slab

My condo has a concrete slab. We put down engineered wood flooring. There has been some flooding in neighboring condos, which has damaged the flooring. Does anyone have a suggestion for flooring ...
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Is a rotary hammer with an impact energy of 2.7J suitable for household projects?

How can I find if an impact energy of 2.7 J is enough for chiseling concrete slab ? I am thinking about purchasing a Bosch GBH 240, which has an impact energy of 2.7J. Please let me know if this ...
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Advice on building a livable cabin floor on a concrete slab [duplicate]

I'm planning to build a 10 x 12 livable cabin based on a shed design. The cabin will rest on an existing concrete slab. Many shed designs recommend building the floor with equally spaced joists. ...
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Thicker epoxy rather than grinding concrete substrate to achieve smoothness

I am covering my basement apartment's concrete floors with epoxy. The concrete is very well done (self done, been several years, no cracks, reinforced, 2-3" thick). In order to test the epoxy, I ...
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51 views

Depth of hole when burying a 2 inch schedule 40 pole

How deep of a hole do I need, and how much concrete is needed for 21 foot tall 2 inch steel pipe schedule 40 pole that will be free standing? There will be a 19 foot tall antenna on top of it....
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Shower drain height for curbless tile shower

I want to do floor tiles for the shower and it must be curbless. It is the basement and has concrete foundation. Right now the drain I bought is sticking up 3" from the concrete floor: This is the ...
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1answer
61 views

Pipework after concrete slab is poured

I'm planning to build a 10x8 shed that will house the pipework and electrical equipment for a new well I recently had drilled. I would like the shed to sit on a concrete slab just for the quality of ...
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2answers
56 views

Resealing or repolishing interior concrete floor?

I have a concrete floor in my apartment. It is somewhat shiny. When cleaning up after a pet, I used an abrasive scouring pad on it, and looks like I took off whatever layer is giving it shine: How do ...
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275 views

Ideas on how to fix a void at the bottom edge of my concrete steps?

I was recently pulling weeds and I noticed that there is a hole at the bottom of my concrete stoop. I'm not quite sure on how to address it. I'm pretty handy so I'm sure that this can be tackled ...
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86 views

How exactly do you set these post holders into concrete?

How should you set these bases into concrete? Do you push them all the way down? Or should you leave a gap underneath? If you leave a gap, how big a gap should you leave? It has drain holes on the ...
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3k views

Water heater on concrete--should I build a platform? How much heat loss in winter?

I don't know if that title is the best way to phrase the question. It is 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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85 views

Should you remove sonotubes when possible?

When you're using a sonotube in an open excavation, should you peel the sonotube off of your peirs before you backfill your hole? Or is it better to backfill, then only peel the sonotube off of what's ...
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36 views

What to do with concrete/cement runoff from cleaning tools?

I'm completely new to working with cement/concrete. I can follow various guides online (I'm only looking at really simple loose-brick fixing for now). However, no guide makes clear how I should ...
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Etching solution vs muriatic acid to prep concrete for epoxy

I'm thinking of ways to remove the concrete cream from my concrete in preparation for epoxy finish. Rather than grinding, I need to use chemicals. Initially was thinking muriatic acid but it's in a ...
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21k views

Why can't I drive this Tapcon into concrete?

I'm trying to drive a 2 1/2" long 3/16" diameter tapcon into a 50 year-old concrete slab/subfloor to attach a new toilet flange. The instructions on the case of Tapcons said to drill a hole in the ...
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awkward driveway curve has cars nearly colliding with house, how to mitigate? [closed]

Bellow is an arial photo and a road-side photo of my new house. As you can see the driveway is an awkward curve especially when backing out of the car port to the side of the garage - you have to do ...
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Waterproofing concrete from the ground?

We want to build a table with benches outside. For this, we have a concrete base with vertical rebars (40cm out of the ground). We want to build brick columns for the structure of the table/bench (...
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39 views

Scummy yellow liquid rising from quickcrete recap when resurfacing

I am resurfacing my concrete walkway with quickcrete recap. After or while I am spreading the mixture on the old surface a layer of scummy yellow liquid starts to rise to the top. I have had this ...
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82 views

Span between wood post for stilt cabin

I intend to build on Weiss Lake in AL. If I use 8x8 posts, can I span 10 ft with 2x10 or should it be 2x12 for the floor joists? Also was wondering for the foundation can I just sink the wood post or ...
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67 views

How high should the tops of concrete piers be above grade?

I'm about to pour some footings for a covered deck. I'm going to be putting 6x6 posts on top of concrete piers, but before I cut my sauna tubes, how high should my pier project above grade? Is there a ...
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87 views

How to protect wood when applying concrete patch

I uncovered a situation where a couple header boards were embedded into the basement foundation. You can see in the photo they punched a hole in the foundation and ran the boards through it. I can't ...
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2answers
112 views

Reproduce/build 4“x4” steel bases using brackets?

I was searching for bases that will be used to anchor 4-ft x 4"x4" posts to concrete, and I saw this 12-gauge base for $18. I was also looking at these bases, but they seem a little flimsy. I'm ...
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297 views

How to anchor brick vertically to concrete slab

Here's a concrete slab porch that was finished with paving bricks on top, and then matching pavers attached to the vertical front face with what appears to be some form of Liquid Nails. The pavers ...
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Neutralizing concrete floor after cleaning cream with muriatic acid

I am prepping my concrete floors for epoxy. After removing whatever I can do mechanically with a grinder and cup brush, I was going to soak it in muriatic acid. I did something similar to my exposed ...
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73 views

How can I extend a concrete step without repouring?

Two rooms in my house are connected with a set of concrete steps (one tread). As built, the ledge for the first step is inline with the wall framing. This means that when I add drywall the finished ...
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350 views

What should be used between a concrete tub and wall tile?

I have an older home that has a large, decorative concrete bathtub/shower with tiled enclosure walls. The walls behind the tile and tub are poured concrete. (Yes, the house is very sturdily built.) ...
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Can you “refresh” half-dried concrete just by mixing in water?

I mixed a wheelbarrow load of concrete (sand, cement, water) this morning, but before I could use most of it, I got called away and didn't get back until this evening, like 7-8 hours later. By now the ...
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Can Thinset be used for covering cement driveway or garage cracks and small holes?

I have small holes and cracks in my cement driveway and garage floor. Can thinset be used to level these floors?
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Drainage fix: Flat concrete slab up over my vinyl siding by 2 inches. Is this acceptable?

I am a new home owner. The concrete on my front porch sloped towards the house so every time it rained water drained between the porch and the house. Last week after 8 months the builder took out ...
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Garage floor damp

Been reading on line for several hours now. I have dampness on my garage floor, note: it's about 8yrs old. If I put a box any where on the garage floor for several hours, there will be a damp foot ...