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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21 views

How to frame an exterior wall against a concrete wall (Replacing garage door with person door)?

I'm replacing my daylight basement garage door with a person door which means framing inside a concrete opening. I know to use a pressure treated sill plate and sill gasket on the floor. But what ...
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How can I fasten baseboard over concrete?

I have a concrete curb of about 6" from subfloor to the plate in the room that I plan to finish with 5/8 drywall. I am figuring the best way to attach drywall and baseboard over it. One option ...
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What to use to remove Magnesium sulfate ( palm tree fertilizer) stain on the driveway

need some advice on what to use to remove magnesium sulfate stain from a concrete driveway. I have used ammonia, 30% vinegar but none were effective.
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Was concrete commonly used for 2nd floor flooring in multi-family apartment units built in 1950s?

I used to live in a 2nd floor unit in an apartment built in 1950. There was a golf sized "sink hole" on the floor and I wonder if I may have been exposed to asbestos. I remember the floor ...
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Filling first concrete floor with Autoclaved aerated concrete (AAC) brick to 3 feet height is good?

First concrete floor is with 500 sq.ft. area. Out of this, 200 sq.ft. is in projected form for about 3 feet height. So, we are planning to fill in with AAC blocks up to 3 feet height for the rest of ...
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Crack in concrete slab of house - what best to fix it with?

I have had different people suggest bondcrete, polyurethane, silicone and various layered combinations thereof, as well as epoxy, concrete caulk and mortar. In addition, on this stack site a search ...
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Can water-based paint be applied to a concrete countertop?

I recently cast a concrete countertop using melamine moulds. Overall, I'm happy with the cast slab but the colour turned out different than what I was aiming for. I was using white cement, aiming for ...
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Need to develop an angled Spacer to go in between the Garage Floor and Car Lift post pads [duplicate]

I need to fabricate/develop an angled spacer. 13 inch wide by 10 inch long, by 3/4 inch to 1 3/8 inch thick. This spacer is needed to go under two of the posts of a hobbyist car lift in my garage. ...
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69 views

Need to develop a tapered spacer for under a car lift on an angled concrete slab [closed]

I need to fabricate/develop an angled spacer. 13 inch wide by 10 inch long, by 3/4 inch to 1 3/8 inch thick. This spacer is needed to go under two of the posts of a hobbyist car lift in my garage. ...
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Hanging ceiling hooks from concrete beams above drywall ceiling

I'm hoping to hang two aerial yoga hooks from the ceiling in my apartment (I'm on a middle floor in a ten-story building). I popped out a light fixture to take this picture, and I want to make sure I ...
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Drilling precise holes in concrete without bit wandering

I need to mount some 4" house numbers on a concrete wall (drilling 3/16" holes for studs extending from the numbers). Normally when I drill into concrete, it's hard to get a hole in an exact ...
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Concrete crack repair: (polyurethane) crack filler versus new concrete patch

What are the pros and cons of using crack filler like Sikaflex Polyurethane Sealant or its self-leveling type versus concrete patch like Quikrete Concrete Patch Repair? My understanding is that if ...
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How to repair the caulking around basement walkout doors and what to use?

Another waterproofing question: our basement has a walkout door that is leaking from where the metal doors meet the concrete base. Three pictures from inside and one from outside are attached below. ...
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Will this screwdriver set fit into my corded Bosch GSB 450?

I've this drill. My aim is to drive screws using this driver (not really worried about the drill bits, those are just bonus) I've seen numerous videos on YouTube but all use the holder end (screenshot ...
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Cheapest way to level large concrete floor without losing height

I have an old building that I am converting into a living space. The slab foundation is very old and uneven in a lot of spots. I need to level it, but I can't increase the height of the floors too ...
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74 views

Exposed rebar end in concrete - options

I have a walkout staircase. The top wall of the walkout had to be cut down to use as a tread. Cutting down the top wall exposed 6 ends of #5 rebar. What should I do? The wall is 8" thick and ...
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What are the differences between trowels for concrete and plaster? Are they interchangeable?

I have some paving steps to lay in concrete, and will buy a trowel for smoothing them off. There's an enormous range of trowels/floats available, with almost identical ones for plastering and for ...
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Exterior coating for concrete treads [closed]

I have some exterior concrete stairs that were finished poorly. The treads are back-sloped and pools sit consistently on the treads in the fall/winter. I am having the tread surfaces ground down so ...
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277 views

How to support 20 feet of 4 inch pvc drain pipe horizontally along a concrete wall?

I need to run 20 feet of 4 inch drain pipe horizontally along a concrete wall. Someone suggested saddle clamps and anchors. I am not sure exactly what type to use, especially if the pipe is full of ...
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220 views

Can I cut out a 12" section of a footing to run new plumbing in a basement?

I am finishing my basement and need to run plumbing to the planned bathroom. To do so, I need to cut out a 12" section of a footing (can't go under it). The section in question is under a door ...
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192 views

My concrete is brittle like the density of a cookie

I've started making some small decorative concrete objects. Like trays, potters, table legs, etc. But recently my pours all go straight to the garbage bin. The problem (or the symptom) is that the ...
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How to get rid of water stain on concrete?

Hi there was a leaked pipe and the leaked water formed a trail on my concrete floor. Now the leak is fixed and I thought the water trail will just disappear when it dries up, but instead, it has moved ...
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Process for patching stucco on bottom of wall?

There’s a big chunk of stucco missing on the bottom area of my exterior wall. It looks like the concrete foundation is exposed where the stucco is missing. Can you guys clue me in on what the process ...
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Large 16'×24' “He-Shed” Foundation Needs Fixing

I have a one year old 16×24 shed, 2×8×16 treated floor joists, 2×6 trusses, 2×4 stud walls, box soffits with vents, barn side panels, trim boards, shingled roof, gutters and downspouts, insulation, 3/...
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105 views

How serious are these cracks in drywall and foundation?

I just bought this 20yr old house a year ago and now I am noticing crack indoor as well as on the foundation. Indoor crack goes all the way across the ridge of the angled wall and down to the corner ...
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Filling in low area to create platform with concrete / leveling

I have some steps going off the back door of a house (from the 50's) that I'm working on and am attempting to help prepare for market / sale (USA). The steps go down to an easement which runs ...
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54 views

How to prep and level part of my garage when there is a 6" difference in hight?

Specs: Garage floor is cement 24'x32' (except where the car will park.) far side is approximately 6"lower than the other. (~1° slope) large crack running the full length. a number of smaller ...
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68 views

Shallow mailbox post hole

I need to build a mailbox post (for two mailboxes) and have confirmed underground power and data cables exist. Unfortunately the plans don't specify the exact position or depth and it's likely the ...
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Pouring concrete slab around wood posts of covered porch [duplicate]

I have a covered back porch. Sloped roof attached to the house on one end and supported by four 4x4's which are cemented in the ground on the other end (I assume there are cement footers below the ...
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17 views

42" Elevated Foundation Build in Coastal NC

What are the best practices for residential elevated foundation 42" construction in Coastal NC? I have read alot about: soil tests, compacted fill, 4" of gravel on top of compacted fill, ...
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Foundation Crack and Severity

My wife and I recently completed a house inspection. A little on the house: it was built in the late ‘40s, the grade is excellent and has been built up around the entire house, the drain spouts do not ...
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Inexpensive way of fixing cracked area of concrete parking?

This is my parking. As you can see, there are sections of the concrete that have cracked. Also, there's soil under the concrete. The parking's pretty narrow, so I don't have too much space between the ...
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Any problem pouring concrete in layers because of the capacity of the mixer

I'm making a 9' x 8' x 3" slab as part of a repair to my driveway. The old driveway concrete has been removed from this space. The new concrete will abut the original driveway on both sides. I'm ...
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238 views

How big a problem is wood embedded in a basement concrete floor?

We purchased a home where the previous owner did a lot of home improvement himself. The house has a finished basement and I believe the previous owner mentioned something about him digging out and ...
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96 views

Can I sieve pre-mixed concrete for thin applications?

I have bought a pre-mix "multi purpose" concrete. The mix appears to be mixed with sand and small stones. I have seen Creating a concrete mix with smooth texture which is about how to make ...
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How To Make Concrete Acid Stain For Floors

Recently I completed my concrete floor done inside my house. But that doesn't look good all the way. I don't want to do tiling, Because i feel that costly. So I planned to do acid staining so that ...
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338 views

Why does my concrete not look smooth

I have laid a concrete slab for the first time. I bought a general purpose, ready mix tub of concrete and followed the instructions (add 400ml water to 5kg of concrete mix) The end result is ...
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How to safely chip away at a tile to make room

I need to install a shower against a tiled wall. I have 2 issues : I need to safely remove a tiny bit of the tile, to give me more access to the water outlet of the pipe. What tool and method should ...
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Anchors for concrete - what to use on a concrete ceiling?

When it comes to concrete, besides metal anchors like lag shield we have the plastic ones being: wall plug, plastic anchor and ribbed anchor. Is there any other (non-metal) anchor that can be used on ...
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What's the easiest way to remove tile flooring off a cement foundation?

We're wondering if removing the tile that's on our concrete foundation is too hard for us to do ourselves. Question: Is there a way to do it that makes it a little easier and faster? We want to ...
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189 views

Install wood panel in concrete ceiling

I would like to install a 30 x 60 inches wood panel (1 inch thick) in the ceiling. Not sure how much this wood panel alone would weight. Looking for suggestions of what kind of wood to use. The idea ...
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310 views

Can a wood-router be used to cut a shallow groove in concrete?

My house walls are primarily made of poured concrete. To run wire through the walls I need to cut a groove in the concrete then plaster over. Is it possible to use a bit that can cut (slowly) a ...
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46 views

garage threshold concrete

What is the strip that runs between the garage and the driveway called? Also what does it do? Is it a thermal break or is it there too prevent the concreate from cracking? What is the material? How ...
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104 views

Fix garage door sitting on asphalt driveway

My garage doors sit on the asphalt driveway when closed and I'm not sure why this is. In the photo I attached you can see the line/indentation in the asphalt where the door sits. I'm not sure if the ...
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48 views

Hanging lights from a gap?

I live in an apartment complex with a small-ish patio. Every year they have a decorating contest, and I always try to hang some lights using command hooks, but they never quite hold on to the concrete,...
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102 views

How do I break a concrete slab without damaging cabling running through it?

I want to install fiber optic in my house. It shouldn't be an issue except at some point my phone cable goes through a 5cm-thick concrete slab that was cast around it. This happens in a weird corner ...
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294 views

How to keep plastic concrete screw anchors from spinning?

I keep on getting these concrete anchoring kits in floor safes that consist of a 1/2" plastic insert and lag screw. (see photo) The instructions say to drill a 1/2" hole in the concrete, tap ...
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413 views

How to cut a concrete block without expensive tools?

I am building a wall from concrete retention wall bricks. I need to cut one brick in half so it can fit in the wall. The solutions here are too expensive, I only need to cut one brick. Is there any ...
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60 views

Proper base for stone walkways

The stone walkways around my house have all come apart to various degrees. I'd like to find a solution that will last for at least a few years. Is pouring a concrete base the right way to go? Or is ...
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Will caulking control joints in a slab reduce freeze damage?

Should control joints in exterior concrete slabs like this be sealed? I look at the joint collecting debris and imagine that if the joint itself doesn't hold water, the debris will, and then freeze ...

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