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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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70 views

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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40 views

Advice on building a livable cabin floor on a concrete slab with insulation and plywood

I'm planning to build a 10 x 12 living space based on a shed design. The shed will rest on an existing concrete slab therefore my plan is to lay 6 mil polyethethylene sheeting and foam board ...
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61 views

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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50 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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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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1answer
80 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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78 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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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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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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38 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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49 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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294 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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72 views

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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4answers
79 views

Pros and cons of plastic/gravel shed bases vs concrete base

I'm going to have a 10x8ft shed installed in my back garden. I'm wondering if I should pay someone to put in a concrete slab base or use one of those interlocking gravel filled bases you can get. I'...
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75 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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69 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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3answers
98 views

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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59 views

Remove rotten mail post

I have to remove the rotten mail post and install a new one. The post was broken. I have to take it out first. The difficult thing is that the concrete around the post root. It's deep and hard. I ...
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135 views

How to Fill Gap Between Steel Beam and Concrete Pillar?

I have a Concrete Foundation Pillar that is 5/8th of an inch too short. What filler materials are appropriate when a steel I Beam will be resting on it? Can I use mortar, or is steel more appropriate?
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Using just cement to plug a narrow channel/hole

I know that ideal thing is to use concrete, a mix of cement and aggregate (usually sand and gravel/rocks. However I have a bag of cement that's not going to go to any use, and my aim is just to cover ...
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32 views

how to best remove concrete splash from vinyl siding

When our contractor poured the concrete for sidewalks and handicap ramp, concrete splashed onto the vinyl siding. Is there a product or way to remove this more easily than hand-scrubbing? Pressure ...
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1answer
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What kind of garage flooring is this?

I like the flooring here in this picture but wonder what it is Is it some paint / stain on top of concrete? Because I can see the crack. Or is it some laminate plastic thing?
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73 views

Sand and refinish uneven concrete

My patio concrete shows multiple pieces put together in the past I am thinking of renting a concrete grinder 10” and make it even. Then either paint or put something on top to cover. I may fill the ...
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151 views

How can I repair the degraded surface of a concrete slab and wall?

I've never worked with concrete. Is there an easy way for a concrete newbie to repair this wall? OR- How do I fix it? Here is another view, further back. =================== Found these in a ...
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1answer
58 views

How I prep a concrete garage floor for painting?

Is there any special considerations for painting a concrete garage floor as opposed to any other concrete surface? I'm thinking in terms of foot and tire traffic.
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60 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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79 views

How can I put in a screw in a concrete ceiling without power tools?

I want to hang my plant but my ceiling is concrete. I don't have a drill. I have a hammer and screwdriver.
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26 views

tub overfowed, didn't realize floor and pad are wet. pulled up thought was dry. when i cover with pad and carpet gets wet

I have been drying with space heater and dehumidifier,. however if i put carpet back it gets saturated. I am drying for several days, then cover with carpet, after 5 days carpet is dripping wet again....
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162 views

Will a PVC pipe crack in concrete?

If a plastic PVC pipe is totally covered with cement? Does a minor crack/s in the concrete will also crack PVC pipe or damage it? I mean cracks such as due to very minor seismic movements?
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69 views

Laying Stone on a unlevel concrete surface

first and foremost thanks for the help :) I am in the process of redoing my porch and I have hit a road bump along the way. I am planning on laying real thick stone (as seen here) on the porch floor. ...
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51 views

Materials for building inexpensive light-weight large planter?

I've wanted to build a few large planters for a while now, and I've considered using concrete, wood, etc. I don't know what other cheap material to use. Initially, I wanted to make them out of pre-...
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83 views

Material lighter than concrete for planters?

I'm trying to build several 24"x 24" square planters with each wall 1.5" thick, similar to the following picture. The issue is that each one of these planters will weigh at least 200 pounds (without ...
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1answer
68 views

Distance between edge of concrete for anchor bolts?

In residential construction, placing anchor (j bolts) for the sill plate, I have always read that it's best to stay towards the outside edge of the foundation and face the J portion towards the ...
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67 views

Is this a properly done aggregate courtyard

A restoration company came out to repair our aggregate courtyard that they damaged while working on our home at their cost (which they should). We also had them extend the courtyard up to the front ...
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35 views

Do these plastic molds exist?

I want to make a few concrete pavers, so I started looking for a few tutorials, and found this youtube video. In the tutorial, he uses a plastic mold where he pours the concrete. Something like this: ...
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Screw doesn't grip

I have just purchased 3/16 x 2-3/4" philips head tapcons and the recommended 5/32" drill bit. I drilled the holes using hammer-drill with ease and plenty deep as recommended. Attempting to drive the ...
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71 views

Rebar required for 24 ft tall 4x4 square steel tube 1/4 inch thickness, 4ft deep in a concrete base, horizontal load of up to 1,000 lbs at the top

I am installing a 24 ft 4x4 square quarter inch thick steel tube 4 ft into the ground with a concrete base of 28 inch diameter and just over 48 inches deep, so 20 ft of the post is above the ground. ...
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61 views

Lard as release agent?

So I’m learning how to make concrete pavers with this youtube video. He mentions that he uses lard as a release agent, so he brushes that into the mold. He also suggests cooking oil or motor oil for ...
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69 views

How to repair a hole in exterior concrete foundation

We have had this hole in our exterior foundation for a few years. The way we discovered it was that water was leaking into our basement finished room, and when I looked outside, I discovered this hole ...
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Repointing stone basement

I am looking into which cement to use to repoint our old house (built ~1900) stone basement. I found conflicting advice, some suggesting type N or type S is fine, but some sources suggest that ...
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69 views

Crawlspace Post to beam lumber grade

Recently we replaced some of the rotten and cracked true size 4 in x 6 in. posts under the house in crawlspace. The old posts were resting on concrete pads 24 in. x 24 in. and supporting a true size ...
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46 views

above ground pole support for sail cloth

I need to create above ground, mobile "footings" for metal poles to hold sail cloth. I was thinking of a cardboard tubing, filled with concrete to hold a sleeve to insert the pole into that will hold ...
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3answers
39 views

How would I remove a concrete shelf with possible reinforcements

I've had a brick-walled cupboard removed from my kitchen, but the concrete shelf that was in it had to be left because of the gas piping around it. The piping will be removed for 2 days soon while a ...
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179 views

How do I calculate the concrete needed for a fence post?

I'm trying to determine how much concrete I'll need to set fence posts for a 6ft tall privacy fence. From what I've read these are the parameters I'll be using for each post hole. Post: 4in x 4in x ...
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56 views

Can the vapor barrier between a dry floating concrete slab and linoleum flooring be foregone?

I have a two year old house that sits on an 8" concrete floating slab. The slab is insulated below and around the side. The floors in the house are unfinished. That is, the concrete slab is ...
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105 views

How much water for mixing with concrete?

I bought a bag of quikrete mason mix for creating some planters from molds. The wood panel molds look something like this, but the spacing is a bit narrower and they're smaller: Since I'll be pouring ...
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2answers
114 views

How do I build a fence with zero experience?

I've never built a fence or have never done any outdoor construction. I'm pretty handy and do most of my interior maintenance. I have a total of 780 feet where I need to put up a fence. I'm still ...