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35 votes
Accepted

Can these concrete protrusions be removed without a grinder?

Your options are dust or chips. An angle grinder with a diamond wheel would make quick work of it, but you'd want a helper holding a good shop vac directly in the line of fire. Otherwise, a cold ...
isherwood's user avatar
  • 140k
27 votes

ICF home -- are columns in the photos load bearing?

In a concrete wall (which is what an ICF house is built from) those are certainly load-bearing concrete columns. It would have required some very deliberate design to make the header over that space ...
Ecnerwal's user avatar
  • 220k
20 votes
Accepted

How to shorten a concrete pipe sticking from ground

There exist dedicated concrete cutters. For example the Stihl TS 420 has about 12cm cutting depth. I don't know if those saws allow horizontal cutting. A preferred solution would be to simply raise ...
Martin's user avatar
  • 3,074
16 votes
Accepted

How to drill a hole into a thin concrete wall without breaking off pieces from the other side

My answer would be: Don't attempt. There are basically two ways of drilling concrete: With hollow bits, but this usually requires water cooling, which might not be what you want. With power/pneumatic ...
yo''s user avatar
  • 685
15 votes

What drill bit should I use to drill a 2-1/2" hole through 8" of concrete?

Core drill, preferably wet. Look into rental for the tool. If doing it with a dry bit, stop often to vacuum the dust out and allow the bit to cool. If you overheat diamond it either turns to charcoal ...
Ecnerwal's user avatar
  • 220k
15 votes

Copper pipe used in concrete

Small-diameter copper tubing was used to pipe fuel oil, stored outside, to an oil burner. For protection, it was often embedded below a thin layer of concrete. You can see images and information at ...
DrMoishe Pippik's user avatar
14 votes
Accepted

How do I go about repairing/redoing this uneven and damaged basement concrete floor?

The best solution would be to break it all up and re-pour a nice monolithic reinforced slab. That's also expensive and a lot of work, so you might want to consider attempting "not the best" ...
Ecnerwal's user avatar
  • 220k
12 votes

Why is there efflorescence and spalling several feet up on an interior column in my basement?

A picture would help, but just from your description, water is likely coming down the fireplace's chimney, then down to the ash pit. It could be coming down inside of the chimney if the cover has a ...
BaddDadd's user avatar
  • 287
12 votes
Accepted

How to address crumbling garage floor?

You certainly can "clean out all the loose concrete" to "fill it and smooth out the floor a little bit", but concrete will not be the correct product. Instead, look for a high ...
Jimmy Fix-it's user avatar
12 votes
Accepted

How to demolish and remove a small concrete pad?

Unless you want to be swinging a sledge hammer for a week, think about renting a small electric jackhammer. I know you mentioned "no jackhammer" but I'm guessing you were referring to the ...
JACK's user avatar
  • 82.1k
10 votes

Why do some people cut concrete before they break a hole in it?

It helps to confine the breakage to a more defined area, by providing a stress concentration and weak point at the edge of the area you want to remove. A side effect is that because it concentrates ...
Ecnerwal's user avatar
  • 220k
10 votes

How to drill a hole into a thin concrete wall without breaking off pieces from the other side

Something that is very common in wood working is to back the piece you want to drill a hole into with another scrap piece of wood. Tearout happens at the back of the work piece when the drill ...
YPOC's user avatar
  • 200
10 votes
Accepted

How to install a curtain rod with a perpendicular wall on one side

I'd use a standard rod bracket on the right and a cup on the left. If you are mounting to concrete, simple plastic plug anchors should work very well. source source
isherwood's user avatar
  • 140k
9 votes

Can I set bricks into my concrete slab as height guides?

Just do what every concrete job normally does and set screed guides (usually the tops of the forms - takes a fairly huge job to required intermediate ones, which are fussy and annoying because you ...
Ecnerwal's user avatar
  • 220k
9 votes

Can these concrete protrusions be removed without a grinder?

Another (more manual) option is a rubbing brick. They're often billed as being used to remove form marks, which is likely what you have there. It's a handheld piece of silicon carbide or something ...
Isaac Francisco's user avatar
8 votes

Would rebar be necessary for ~3-4in of concrete used to raise a graded garage floor to existing slab height?

Frame Challenge: Instead of pouring concrete, self-lever, whatever, consider laying 2x4 pressure treated (or a plastic vapor barrier then non-treated 2x4) joists to raise the height. The 2x4s (3.5&...
FreeMan's user avatar
  • 47.4k
7 votes

Is this the normal curing process for my new driveway?

From my experience, concrete is dry enough to touch within hours to a day. It's normally hard enough to walk on after 24hrs, but it will scuff. To reach full-rated strength, it can take a month. So ...
Rohit Gupta's user avatar
  • 6,550
7 votes

How to shorten a concrete pipe sticking from ground

My answer assumes your local ordinance permits you to achieve your goal. Mark the inside perimeter with a sharpie or paint line for guidance Use a masonry bit to drill a few holes next to each other ...
MonkeyZeus's user avatar
  • 16.7k
7 votes

Copper pipe used in concrete

When you're laying a concrete floor, it's very easy to lay pipework first and concrete it in. When the pipes need upgrading or replacing though, it's not practical to remove them though, so new pipes ...
Graham's user avatar
  • 2,026
7 votes
Accepted

Is it safe to excavate soil next to concrete slab?

The only issue would be if the regrade created a soil erosion problem that eventually removed soil from below the slab. As long as the compacted soil stays below the slab, you're fine. Assuming that ...
popham's user avatar
  • 10.4k
7 votes
Accepted

How do you balance and transport a container of concrete on a ridged roof?

Build youself a small bench similar to the picture that can sit across the ridge and provide a flat space to hold your bucket. Obviously you would need to adjust the dimensions and angles to work with ...
Michael Karas's user avatar
  • 65.1k
6 votes

How to drill a hole into a thin concrete wall without breaking off pieces from the other side

If you want to minimise the chances of breaking out then you need to use a drill on a stand where you can control the feed rate and use minimal pressure to achieve the cut. However, even an odd lump ...
Solar Mike's user avatar
  • 27.7k
5 votes

How to shorten a concrete pipe sticking from ground

Obviously, with a cutting wheel, you would cut around the outside, as deep as possible. 6cm, you say. That will cut through at least some of the concrete wall. Don't forget to stuff a cushion or ...
Tim's user avatar
  • 5,308
5 votes

ICF home -- are columns in the photos load bearing?

Caveat: Amateur rather than professional here. I am almost certain these are load-bearing. Tell-tale signs for me: Columns which are this thick (or rather, with minimum dimension this big) - some of ...
einpoklum's user avatar
  • 2,797
5 votes

How can I fasten wooden stair treads to porcelain tile on concrete?

IRC R311.7.5.1 specifies that the difference between the largest and smallest riser in a flight of stairs shall be 3/8" (9.5mm) or less. If your applicable code isn't based on that, it still very ...
Ecnerwal's user avatar
  • 220k
5 votes

How to install a curtain rod with a perpendicular wall on one side

There seem to be a variety of options with various pro/cons tension rod, from wall to wall (aren't as strong and curtain would span whole wall) source ceiling mount. Shouldn't be any problems with ...
depperm's user avatar
  • 840
5 votes

Vapor barrier (sheet) over concrete pad below ground level deck?

I would not. Your lumber is treated against rot anyway, and poly will mostly serve to trap moisture and encourage mold and odor. Let it breathe.
isherwood's user avatar
  • 140k
4 votes

garage floor: damp

First, check for any water landing near the edges of the foundation. Gutter problems or water infiltration into the wall can result in a wet slab. Check for these problems first. They're often cheap ...
KMJ's user avatar
  • 12k
4 votes

What flooring options are there to make a concrete basement safe(r) for falls while retaining wheelchair accessibility?

I suspect these two goals are fundamentally incompatible. The harder the surface, the easier it is to roll a wheelchair on. The softer the surface, the safer it is for falls. Rubber, low pile ...
KMJ's user avatar
  • 12k
4 votes

Can a concrete porch be raised about 4 feet?

Can it be - sure, just a matter of spending enough money. Unless there's some particular reason to "raise" that particular slab of concrete, probably a lot less expense to leave it where it ...
Ecnerwal's user avatar
  • 220k

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