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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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Minimum Concrete Thickness Over PVC After Rough-In

I just has some plumbing roughed in for my basement. The plumber did an okay job but for some reason routed the drain pipe for the sink under the area where my shower will go. This would't normally be ...
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water drainage WHEN IT RAINS

what is the best way to raise,my cement sidewalks level a couple of inches for better water drainage 2 1/2 feet W X 20 ft length
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Mounting 2'x3' Glass whiteboard, drywall over concrete

I am trying to mount a 2'x3' glass whiteboard that weighs ~14lbs to the wall in a new condo. Best I can tell, there is a concrete barrier very close to the surface drywall, and it isn't giving me ...
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Weak concrete mix suitable for patio substrate and similar work

I'm having odd difficulty in tracking down an answer to this question. Searches for "weak concrete" tend to cover weak sand/cement mixes (but no gravel), typical strong sand/cement/gravel mixes - and ...
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Should I be concerned about rust on a post in my basement?

How long do support posts last? Any reason to be concerned with rust on them? Seem to be working fine.
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How do I attach a wooden post to existing concrete steps?

Background At the front of my house I have concrete steps leading up to the porch. Having just rebuilt the porch, I've discovered that they are actually concrete veneer over brick. It appears that ...
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Removing fibreboard plinth from concrete floor

A previous owner of our property fixed a fibreboard plinth to the concrete floor under our kitchen worktop to raise the height of the dishwasher there; I'd like to remove that plinth to fit a taller ...
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Will concrete on top of a corrugated sheet corrode it?

I've read that concrete/cement will corrode metal over time. How long does it take generally? For example, if concrete is on a corrugated iron sheet, how long would it last before it corrodes? And ...
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Crawl space water

We have had 3 straight days of rain and I noticed a small amount of water seeping under scrawl space wall. My space has a vapor barrier and is in decent shape. I did notice the finder blocks on frame ...
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Medium-term repair for spalled foundation with exposed mudsill

I have an old house (built in 1946) near the ocean. The foundation in the back has spalled off, exposing the mudsill in some places. The worst spalling is 4" deep - you can see the mudsill and a few ...
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Normal working time for Quikrete 5000?

I'm having a hard time finding the "working time" specifications for Quikrete 5000. The Quikrete 5000 Data Sheet says "higher early strength", but I'm only assuming that means it will achieve a ...
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Least invasive way to find foundation footings under basement slab?

For a 100-year-old brick house (two-flat) in Chicago, I'd like to find my foundation footings so that I can plan in-floor heating. What's the least invasive way to do so? I'm imagining drilling ...
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Render internal wall after doorway brickup

As per the picture, I have a room with a bricked up wall. All the walls are concrete. The doorway has been bricked and covered with what I believe to be cement. So far I have sanded the doorway with ...
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Water puddle in backyard causing leaking in garage concrete wall

This is what I saw in the backyard of a split level home after a light rain The water was there due to overflow from gutter. I can clean the gutter but the puddle situation must be fixed as it will ...
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Pier foundation and water table issue

I am in the process of building a small (14x14) log cabin in the woods on a pier foundation: After marking the perimeter, I began excavating the soil and dug to below the frost line (36"). The plan ...
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Bistro lights for wedding structurally sound?

Hey guys and gals, 1st question here. I’m having my wedding in my backyard and my fiancé insisted on having a light canopy of bistro lights in my back yard. Of course I obliged, but the quotes I got ...
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What went wrong with this wall, and how do we fix it?

My friend's condo was built in 1960 and renovated before she bought it, in 2010 or so. Not long after she moved in, a chunk of plaster on the kitchen ceiling fell off, then a little later the same ...
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Should I resurface my concrete before laying epoxy on a garage floor?

I'd like to lay down epoxy garage flooring. The concrete in my garage is still original (50+ year house) in relatively good shape. Will the epoxy fill in minor (1/8" or so) imperfections which are ...
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Suitable work surface and tolerances for casting concrete countertops

I'm casting 2" thick concrete countertops using ¾" melamine forms/molds. The largest piece is about 26" square and the longest is about 55" x 11". I thought I'd make a large flat work surface for ...
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Installing vinyl siding over concrete foundation walls

A while back I tore down a deck and did a bit of landscaping, exposing quite a bit of the concrete foundation of my house. I have vinyl siding above and around this portion of concrete but would like ...
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Is there enough time to pour 40 sqf 4" slab with 60lb bags of premixed concrete if working alone? Any hints?

I am planning to pour 40 square feet of 4" slab to support light shed. I was thinking of using 60LB bags of regular premixed concrete (not fast set). I figured that getting it as ready mix in a truck ...
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Avoid rust where railing anchors into concrete

If you have seen railings anchored into concrete, you may have noticed how they tend to rust at the junction between the railing, the concrete and the air. Here is a photo of a pretty typical example: ...
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Concrete board and tile as soundproofing

Best guess, I got a six inch, 24" on center, metal stud wall with 1/2" gypsum on both walls with collapses insulation. At best guess, my STC is about 40. My restrictions are, I cannot move studs or ...
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Building a 'Concrete' Ramp, Concrete Mix

I'm trying to build a ramp as shown in the picture below. It will be above a concrete floor connecting to another concrete floor, so I suppose it doesn't have to be very strong as it will not be load ...
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When calculating rebuilding costs for insurance purposes, should foundation replacement be considered?

In this question I asked at what temperature a foundation becomes unusable for rebuilding purposes. The answer was a fairly low 570°F (~299°C). A house fire that burns a structure to the ground would ...
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Using lower density blocks for block+beam floor - what impact should I expect on acoustic performance?

I'm upgrading a house's upper floor (UK: 1st, USA: 2nd floor?), from suspended timber to suspended beam & block. There will be a ceiling below and flooring above, but for this question it's ...
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Concrete Pavers with Scenes

I was given some concrete pavers that have scenes molded in them. I would like to paint them so that the details in each block can be seen. One is of an eagle and another is the American Flag. How do ...
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How to remove concrete paving stone from mold?

I've been making decorative concrete paving stones for use in the garden recently and everything's been going fine until I tried one in a new mold I purchased and I can't for the life of me get the ...
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What are my options to level a concrete driveway?

I have quite an old house that was built in the 40s. During the heavy rain and winter seasons, I typically get large puddles of water in-front of my garage that seeps slowly through the weather strip. ...
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In a house fire, how hot does the foundation have to get before it too has to be replaced?

Not long after the Oakland Hills fire in the early 90's I was talking with a homeowner. I ignorantly said that at least he can still rebuild on the same foundation. He said that at about 2,000°F the ...
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How to fill gap between garage floor and driveway

I have a concrete garage floor and a section of concrete driveway next to it. Over the years the driveway has settled a little bit and the gap between the two is probably close to an inch wide and ...
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Is chert a suitable base for a concrete driveway?

I'm looking to extend my driveway to add additional parking spaces. The area will be rougtly 20'x30'. I've contacted a few contractors to get prices on material and labor. Prior to calling ...
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Flooding In New Construction Building

This weekend, water was observed flowing up, through the floor and through other joints, into the building - making a swimming pool we didn't ask for! Some Background We currently have a project ...
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160mm pvc pipe running through a deep concrete pour - will it crush?

I have am unusual situation. I had to use 160mm pvc pipe to create a wide duct for services connections that must pass about 500-660mm deep through a new footing that's about to be poured. The pipe is ...
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Is there a way to remove a root from under a walkway to bring it back to level without getting the walkway redone?

I had a disaster of a huge river birch tree in front of my house when I purchased it a year ago. I had it removed about five months ago, and the roots that ran through the yard were ground out along ...
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Will steel continue rusting if it's completely covered in concrete?

Let's say I have a 5" piece of rebar in a rooftop that's exposed to the elements (ie.sun, rain, salt air, etc). After some time it will be covered in rust and pieces of rust can be scraped off. Let's ...
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Inground trashcan hinge

I am trying to search for the in ground trashcan hinge. I've tried searching online for the part but don't know the correct name of it. Very hard to come by locally. The lid where it attached is about ...
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How to level concrete surface?

I have a concrete patio thats been tiled over. Part of the patio is lower than the rest so it collects water. How do I level it off? I guess pull up the tiles and add another layer of cement to the ...
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How do I stop water from wicking into the wall?

I just bought a new home, and water is getting into one corner of the house. The drywall on the inside of the pictured corner is soft and there was mold under the baseboard, but no water marks are ...
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Help me figure out my wood shed foundation!

I recently bought a house that already had a (~2 year old) 12ft * 10ft shed in the backyard. Currently the shed just sits on some gravel. I plan on turning the shed into a 2 room sauna/changing room ...
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Can I cover rebar sticking vertically out of the ground with something that would permit me to pour concrete over top of it?

First off, this project is free from review from inspectors; i.e. none of this has to be to code. I want to pour a concrete column. The column isn't structural - it's like a column you may find at ...
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How long before I can move a concrete lid?

I cast a concrete lid to replace the broken one on my well pit. My lid is 30"x 36", and 2-1/2" thick and reinforced with rebar. I am keeping it covered with a tarp and misting it every few hours. How ...
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Inground trashcan missing neck

I have two in ground trash cans that are missing the neck where the hinge attaches to the lid. When it rains, water gets in and fills the hole. I have a 32 gallon plastic trash can that I put in and ...
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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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Which anchors to use for a wall in a basement [duplicate]

I need to extend one of the walls by approx 30 inches. I will be using pressure treaded 2x4 in bottom of the wall and wall will be about 83 inches high. Which anchors should I use to secure the ...
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How to put drywall over garage uneven concrete wall?

I would like to make my garage wall a bit "smoother". And now I think about using drywall to cover the bare concrete. However the concrete is very uneven with at least 1 inch of concrete sticking out ...
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Cut rebar in concrete

I opened up a hole in my concrete wall to pass a threaded PVC 2 inch male adapter. On the other side there is an aluminum metal sheet. The problem is that I hit rebar and can not change the position ...
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Please help! Exterior Sliding Door Leak on Interior Slab - No visible threshold - 1980 construction

I have a townhouse built on a concrete slab. Laminate flooring was installed 5 years ago, and has buckled severely at the patio door. I suspected water intrusion, cut back the laminate, and saw: The ...
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2x4’s embeded in the foundation wall

A home is going up right next door, and I noticed that the foundation walls have 2x4’s embedded in them. Won’t that cause the concrete to crack when the wood gets wet?
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Sleeve anchors not going all the way in?

I bought some 3/8" x 3" sleeve anchors for a fence i'm installing. This is very hard concrete from a building ledge; the holes cannot be drilled with a regular hammer drill. So we drilled 3" holes ...