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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12 views

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?

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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79 views

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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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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77 views

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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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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71 views

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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107 views

Florida footing depth

Could someone help me read this? Florida Building Code The structures on the left and right side will be new. Just outdoor multi purpose areas with fixed roofs. Left side for cooking (kitchenette)/ ...
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Light switch on concrete wall

My house came with a light switch installed on a concrete wall in the basement using a metal conduit, and a 1-gang metal box. Unfortunately, the light switch plate sticks out and it's easy to get ...
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Repair of Faulty Concrete Work

I need some advice. Over the summer we had a concrete contractor come in to replace the floor in the carport that became a garage that became my shop. The space is about 20' x 20' and there was a ...
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How much life left on 4x4 posts on my deck (in particular one that butts against the foundation)?

I have a raised deck (no idea how old; maybe 10-15 years). It is supported by 4x4 posts. I couldn't find any concrete footings by digging (maybe I didn't go deep enough). Much of the posts are ...
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123 views

What amperage rotary hammer drill is needed to drill through poured concrete?

I need to drill 3/8" diameter holes, at a 45 degree angle, into my poured foundation basement walls to inject polyurethane, in order to prevent shrinkage cracks from leaking ground water. There ...
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How do I remove this wall anchor stuck in concrete wall?

Bought a TV recently. Tried to mount it onto our concrete block wall. Drilled. Hammered the M8 wall anchor bolt (with the nut on) too hard and it morphed the bolt. Struggled to unscrew the nut, ended ...
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Replacing the concrete around the house, best way to waterproof?

I'm looking to replace damaged and cracked concrete around the house. What would be the best way of waterproofing ? We definitely will do the pitching away from the house, but do we need to install a ...
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50 views

What kind of concrete mixer for a 20 cubic foot project?

I have a small concrete job that requires about 15-20 cubic feet of concrete, less than a yard. It is a wall repair that is about 3 feet above grade and has an excavation in front of it. Furthermore, ...
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Combine Plaster board and autoclaved aerated concrete (AAC)

I have get a big window replaced. The old window goes up to the slope of the roof, but now I want to close the corner part and was thinking about using wood framing with plasterboard on the inside. ...
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Fixing a slippery Sidewalk

Last year I had our crumbling front path replaced. I live in the North Eastern U.S. and the weather can be slippery. The path was sealed ( unknown type) and the path had some grit but not enough. ...
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Coating for concrete staircase

I would like to apply some kind of coating to this concrete staircase that would involve color other than the native. I am not sure if just regular exterior primer and paint would be durable because ...
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81 views

Solid wood flooring - Possible sub-floor issue

I am in the process of installing solid wood flooring in the living room and I have just removed the existing laminate flooring and underlay to find the concrete subfloor is in great condition except ...
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Is this crack something that my builder should fix?

The house was built about a year ago. There is crack along the cut and some more on the slab in the garage, which is the first floor of my townhouse.
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How to seal concrete foundation with rising rebar?

I have a crack in my concrete foundation that I believe is caused by some exposed and rusting rebar. Do I need to do any thing about the exposed rebar or can I just seal it with the rest of the crack? ...
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Replacing sub floor, that is under a concrete floor

House was built in the mid 60s. It's on piers with a craw space. While having it leveled, we discovered rot under the half bath. The water leak is fixed. However discovered the sub floor that needs ...
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Installing a patio door on top of a concrete border

I'm installing a 6' patio door in my garage that leads out to our back yard. Around the floor of the garage is a 6" poured concrete ledge/border that the walls are built on. My current plan is to ...
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What's the "right" level for the surface of a concrete pad? At, above or below grade?

Lots of information about how to lay a concrete pad, but nobody seems to address this overtly. We're building a wheelchair ramp, the bottom is to be a concrete landing slab. We are in the northeast ...
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How to prepare this uneven concrete floor for tiles?

We are planning to lay a tile hearth in our fireplace but unfortunately, the concrete subfloor is quite uneven, see pictures. We have had this fire opening widened, so the black damp proof course is ...
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How do a fix this solid, leaning, solid concrete retaining wall

I have a solid concrete retaining wall that’s leaning against my neighbor’s property. In turn, he has let his yard foliage grow to hedge against it collapsing, which is why it’s hard to get clear ...

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