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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75 views

Backfilled concrete piers with more concrete

I recently poured some concrete piers with sonotubes. Not sure why I did this, but some of them I had the tubes about 1 foot into each hole. I started with filling the tubes and then backfilled around ...
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Horizontal rebar protruding from foundation [closed]

On a new build, in Grants Pass, Oregon, should rebar protrude horizontally from a stem wall foundation? The concrete is poured. It is no Ufer, it is rebar - looks to be used to assist in supporting ...
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Do I need to bolt bottom plate to shop concrete foundation?

I have a shop with concrete foundation. I am planning to build a little office where one wall is against and secured into current shop wall. In that case, do I still need to bolt the other 3 wall ...
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is a concrete slab walkout basement above, below, or on grade? For material use purposes not square footage

I have a walkout basement with 1 long side and 1 shortside above grade... For material usage is this considered above/on grade? since the slab is not really below grade? I need something like: https://...
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Will my expoxy eventually cure below 40 degrees?

I'm in the northeast and on Sunday afternoon (today is Thursday) I installed a post in my driveway with Quikrete High Strength Anchoring Epoxy. It was 60˚ F. Then over the next couple hours the ...
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Basement wall design

I'm working on finishing my basement with 6 corners. The back wall is solid concrete with 4 corners (the garage is above one section). There is no moisture, and I plan on keeping it fresh with the two ...
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Is it sufficient for toilet flange to be screwed to floating subfloor only?

I have concrete slab basement floor with 3" cast iron sewer pipe sitting about 3" below the surface of concrete. To access this pipe I have a hole about 6" wide around this pipe (See ...
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My screened in porch with concrete slab for flooring smells like dirty feet at night

I purchased a home that at the time was an open porch with a concrete slab as a floor (painted). Early in 2021, I had it screened in and wanted to paint the concrete a different color. I stripped/...
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Concrete first timer, needing a block

I have a fifth wheel parked on dirt (only option I have), I cannot pave the entire section due to cost mostly. I'm planning on making a few 1' x 1' slabs 4" thick to set the jacks on, and ...
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Skim coating over plaster walls with semi-gloss paint on them?

I want to paint my bathroom, but the walls are really gnarly and I'm trying to figure out a way to smooth them out before I paint. I live in a concrete masonry building (I think; it was built in 1910),...
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Two by fours embedded in basement concrete slab used for framing... including a load bearing wall. Should I be concerned?

So there's some long ass backstory - sorry for the wall of text! I figured better too much detail than too little tho. We recently bought a house in Vancouver, WA (climate zone 8b), a custom job ...
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Replacing fence posts: embed in concrete or use mounting brackets?

We've got a fence that needs mending. Several panels and even more posts. The current posts are set in concrete. I'm wondering.. do I dig up the concrete and replace it with the same? Or should I pour ...
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Wooden expansion joints

When I laid my concrete driveway I used wood to separate the concrete so that in the future I could remove the wood and position proper expansion material. Now I find I can't remove the wood as it is ...
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Expansion joins in 3m x 1.6m concrete retaining wall (with a brick wall ontop)

I'm working on creating a concrete retaining wall; which is between two large rocks; and will support a wall, and roof on top of it. The whole building is a 3m x 3m shed. When the retaining wall is ...
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1answer
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Why is rebar dislodging stucco? Remedy?

A 25 year old Florida building's rebar is pushing out. The thick red line shows where the rebar is detached from the concrete (and theoretically could be clipped / removed). Thin red line shows the ...
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Elegant way to jack two materials apart, applying spreading pressure to pin them in place?

I have a tall cabinet acting as a room divider. Since it's not against a wall, it could fall. Screwing into the floor or the wall is not feasible, but the top of the cabinet is 5 inches from a ...
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Paint for rooftop in asphalt emulsion sealer?

After researching, I've decided I'll use an asphalt emulsion sealer on my concrete rooftop. Since the coating is black, I would need to paint it. The manufacturer recommends their "silver" ...
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How Deep does a Concrete cut line need to be to control breakage

I have a suspended 4 feet high concrete deck 36x 12 and 4 inches thick. It is suspended every 6 feet with concrete blocks in both directions with a center beam.So I have the outside walls and a center ...
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Why did cracks form over the rebar grid in my concrete footings?

I am building a house and we just poured concrete 3 days ago and now it has some cracks, This is the footer with reinforcement : This is footer after pouring concrete : These are some cracks that we ...
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Waterproofing mortar over hydraulic cement

A 2sqft section of my poured-concrete basement wall has begun weeping. It seems that the concrete was not mixed thoroughly in this area and after 80 years the water has found its way through. There is ...
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Can I pour a concrete foundation in multiple pieces?

I'm building a 25-meter (65 foot) block retaining wall. The engineering specifications require a concrete foundation for the block wall equal to about 4 cubic metres (141 cubic feet) of concrete, with ...
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Driveway Water Pipe Cover

I've recently had my driveway replaced, and one thing that didn't come out very nicely is this water pipe/main thing. I'm not sure exactly what it is, so any additional information would be welcome. ...
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Where can I find a Strength Chart for Wood and Steel by size and length? [closed]

I am looking for charts for the Strength of 2x boards by span distance and the same for Angle Iron steel. Like 4x4 x 1/4 thick in 2 feet lengths or 2x4, 2x6, 2x8, 2x10, 2x12 and lengths like 6-8-10-12-...
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Is there any reason to not caulk/foam between the garage door jamb and rough opening?

There is a gap between the rough edge and the garage door jamb. From some research, it seems like it's common practice to caulk/spray-foam this area to prevent drafts/etc. However, before doing so, I ...
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Best material to protect concrete outdoor retaining wall from BBQ/pizza oven built onto it

Note - I've read Should I insulate my pizza oven between the firebrick base and concrete? and Will a slab poured with mortar stand up to service under a pizza oven? but they aren't rerally what I need....
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How can I fix ripped wall paint?

I accidentally ripped the wall paint on the concrete because I placed my mesh Wi-Fi on the wrong spot. The paint was only done a week ago and I'm wondering how can I fix this the right way without ...
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What is this unused pipe in basement wall

It is approx a few feet below ground level. It has started leaking/pouring clean water in heavy rain. House built in 1950 on flat level lot. We have owned for almost 2 years and has never leaked ...
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Is my approach to installing wood subfloor over concrete correct?

I recently purchased a new home in South Carolina, and was planning to extend the existing hardwood throughout the rest of the ground floor. Once I began to remove the existing carpet, I saw that ...
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How to remove this grey deposit from concrete

Our house facade has a plint made of concrete with exposed aggregate. On the corner of the house, the plinth has a greyish deposit on it (see pic). Since this part is not fully covered by the roof, I ...
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Fixing chips on the edges of a basement slab

I'm planning on redoing the flooring in a basement room which has a concrete slab in a 1974 Seattle house. The current carpet, which I've already removed, will be replaced with LVP. After removing the ...
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41 views

Can I build a porch extension on a slab?

I would like to make an extension for our house entry. Our home is a split-level type of house, and the entry is super small (no space for a closet. You enter the house, and there's around 3 feet of ...
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Ideas on hump in basement floor?

Our basement flooded recently and we are in the process of redoing it. The slab floor has always had this hump in it, figured it just settled. But I pulled off a piece of the hump and there is gravel ...
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Securing interrior wall to concrete floor with hydronic heating

I purchased my current property before all of the buildings were completed. As such, I have a 60x80 outbuilding that has the plumbing roughed in for a bathroom, but the bathroom was not installed. I ...
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How to level a concrete fountain base on a concrete surface?

I made a concrete slab to house my concrete fountain. The problem is the concrete fountain base wobbles on top of the slab. The concrete fountain itself came with plastic shims that I put in place. ...
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Fix Hole in Foundation

I have a hole in my foundation that is letting a ton of water right into the crawlspace. I think it formed over several years from a gutter downspout that wasn't functioning properly (I plan on ...
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How can I repair a large chip in the front of a concrete hearth?

I am working on an old fireplace and there seems to be some damage to the hearth. The middle section has some damage on the face and I'm wondering how to go about repairing it. They are made from ...
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How to cosmetically improve surface of newly done concrete slab

I am looking for advice on how to smooth out the surface of my newly done concrete slab. I used 2x6 studs to make a raised slab for a concrete fountain that will be placed in the center. Only about 10&...
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1answer
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Building concrete slab to support a 400lb stone decorative fountain outdoors

all. I am about to build two concrete slabs to support my two decorative outdoor fountains in our front garden area. I am wondering if I can get the best advice for thickness of the slab, PSI for the ...
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Anchoring CAT6 cable and a cameras to hardie plank

I am going to drill through hardie plank to run CAT6 to a camera. The run outside the house will be about 10' to 12'. Total run is about 30'. I wanted to ask if I am going about this the correct way. ...
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can I run a new water line above ground to where it connect by my hot water heater

I my have a water leak in the line below the concrete in my garage near my water heater. Is it possible to run a new water line above ground from the shut off value over to the line near my water ...
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What is the best technique for creating a knockout for an undermount sink for a concrete countertop form?

What is the best technique for creating a knockout for an undermount sink for a concrete countertop form? I’m in the process of building the form. I have an undermount porcelain sink that I want to ...
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Tapcon length to anchor canopy

I bought one of these canopies from HarborFreight: https://www.harborfreight.com/10-ft-x-20-ft-portable-car-canopy-63054.html. I'd like to anchor it down so wind doesn't move it. It has a circular ...
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Filling in an old basement ejector pit

Our basement had an old bathroom in one corner that has been removed and there's an old, empty ejector pit that handled the bathroom waste. There is also a nearby sump pit that is functional and will ...
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LVP flooring in a room with a concrete wall

I'm thinking about installing LVP in a room in my basement that has a concrete wall. All tutorials I've watched talk about hiding the space between the walls and the floor panels with baseboard ...
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What kind of seismic concrete hold-downs should I use for floor joists over concrete?

Our existing floor joists and decking are over an 8" concrete foundation wall. The new work pictured below extends the existing 2x4 frames for more insulation space and we want to secure the new ...
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(Temporary?) remedy for crack in poured concrete foundation

Suggestions on how to "winterize" this cracking in the poured concrete foundation? We're having some masonry work done elsewhere and when shown this crack they didn't want to touch ...
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What level of damp proofing is needed before battening my garage walls?

I am battening my garage walls this week but have read so much conflicting information on what vapour / moisture control is needed. The garage is attached to the house, so one wall borders the house. ...
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What is the recommended spacing for siesmic hold-down bolts for sill-plates to the foundation?

Our 1951 house has 2x4" sill plates atop of concrete. We are in seismic zone D. How frequently should the sill plate be bolted to the concrete?
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Should I cut off loose rusty rebar before patching concrete foundation (spalling)?

I have patched a lot of concrete foundation that is spalling. I encountered a loose piece of rebar (6'long) that I can try to stick back in the old concrete before I patch over it, or I can cut it ...
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Would surface-bonding cement be appropriate for this?

I would like to refinish an old wall of previously finished CMU blocks and bricks. See these pictures: (full-size images also available at https://www.dropbox.com/sh/ryr4m5adx6cd22c/...

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