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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How to fix out of level foundation walls

I am building a detached two car garage and just had the footings, foundation walls, and slab/apron poured. After the walls were poured, I thought that everything was hunky dory as the contractor ...
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Concrete slab for a hot tub

I want to lay a 9 x 9 concrete slab for 125 psi hot tub how thick do I have to make it? And what kind of base should I use?
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Tiling back patio over concrete, with slant towards drain

We have a small 9' x 9' concrete back patio that has a drain in the center (see pic). The cement is angled towards the drain, so when it rains there actually isn't too much water build up, which is ...
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Will old anchor holes in a concrete slab reduce its useful life?

An impaired driver jumped my curb and ripped my square mail post out of the sidewalk concrete that it was anchored into. The bolts were all ripped out of the concrete. Bolts went through the metal ...
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Proper thickness for concrete “flagstones”

I've seen some videos showing how to make "flagstones" out of concrete. The general process is to create a moulding on the ground (usually the grass is dug out so the dirt is exposed), using ...
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Concrete sealant vs spraying to cure a concrete slab

Yesterday I poured a 9ft x 9ft x 5 inch slab and I am wondering if spraying the slab with water is better than using cure and seal during the curing process. I have also seen some people build a ...
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Should a freshly-graded yard have temporary grass seed planted if landscaping can't begin for 3-4 months? [migrated]

I'm doing a fairly large backyard remodel and I guess I'm managing it myself with subcontractors doing different pieces of the work. I just had trenching done and a retaining wall added. The soil was ...
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How do I fill the holes in concrete to reattach a curtain rod?

I am very, very new to this DIY thing, so be gentle. A bedroom curtain rod popped out of this concrete wall with a surface material which I don't recognize. The rod holds fairly heavy blackout ...
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Door threshold/sill from unfinished concrete garage floor

I have a detached garage with a bare, unfinished concrete slab. The side door has a step down to grade. The old threshold was so rotted when we moved in, I couldn't tell you much of anything about it. ...
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Why not always use a stronger mix ratio for concrete?

A lower ratio of sand and aggregate to cement will lead to a stronger concrete. What are the reasons for using a 'weaker' higher ratio mix? Is it just cost?
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Self Leveler Over Thinset Over Concrete

In the kitchen, I've removed the tile and would like to install new tile. The floor still has much thinset over concrete. The concrete has hydronic lines for heated floors, has metal mesh on the ...
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What is the best proportion sand/cement to do pavers?

I want to make my own patio using pre-made molds. I would like to know if I can use only cement and sand. Will it be resistant or do I need to add aggregates. What should be the ratio?
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Flooring Options for Basement with Uneven Concrete Slab

Working on a basement remodel and getting to the point of needing to figure out flooring. Unfortunately, the concrete slab is generally uneven. I had a company come in and grind the floors a few ...
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Insulating wooden beams / frame from concrete footings

I am building a wooden terrace based on frame made of pressure treated lumber (ground contact grade) placed on concrete blocks ("on-grade" footings). Something like this: What I know is ...
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Can this failing concrete patio be resurfaced and how?

Parts of my concrete patio are eroding from around the gravel on the surface. I think it was built in the 70s or 80s. Some parts of the patio are in great condition, others are very bad. Shown ...
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Should the high side of a concrete block retaining wall be sealed?

I am mid-project in a DIY yard project. I have subbed out a large retaining wall to a civil / wall contractor. It’s 220 feet long, between 2-5′ in height, and makes 2 90-degree turns. It’s built to ...
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How should I drain an area of gravel between a sidewalk and retaining wall?

We are reclaiming a flower bed and extending our existing patio. After a gully washer I am now concerned about drainage for this 5ft by 36ft impervious surface we are adding. We are also adding a ...
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Rust free concrete fasteners

I need to fasten a 3/4 inch PVC trim board to a poured concrete basement wall. Since this will be on the exterior of the house I want to avoid rusting of the fastener. The previous pressure treated ...
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Spanning a Gap Between House and Garage with Chain Link

I bought this house a few years ago and the previous owner decided that this embarrassment was the best addition for this garage. Needless to say, it's horrendous and I want to take it off. (and the ...
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Rebar cutter and bender's and the relative grade range of steel

I'm comparing two budget rebar bender and cutter products (Crescent or HIT Tools), not sure the grade of steel Crescent is able to handle other than "soft or mild steel", HIT mentions up to ...
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Best way to source concrete for a long fence project

I've done several small fence projects before, and hand-mixed concrete in a wheelbarrow for each post as I set them in place. However, I'm now looking to build a wood guardrail around a parking lot at ...
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How clean does the surface of new-poured concrete footings need to be before pouring piers?

I'm moving a 8x16 shed-turned-shop onto nine 10" piers on 16" footings over a clay substrate. I'm doing a split pour. I have already dug the holes, poured the footings and set the vertical ...
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Gravel inside concrete form or form on top of gravel?

I am pouring a 5 inch concrete pad for a hot tub. I am planning on putting down 4 inches of compacted gravel under the concrete with rebar mesh in the center. My concrete pad will be 9 feet by 9 ...
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I have an old porous “fruit cellar” of stone/concrete mix crumbling apart. How can I close it off and fill it in? Same with an old leaky cistern

Our house is almost 100 and has a fruit cellar crumbling below our front porch. We had it repaired 3 times but given it is made of a stone/concrete mix the foundation repairs continue to crumble & ...
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Should I have thicker areas of foundation under posts?

I am building a structure with large frame timbers. The structure rests on 16 8x8 posts. There will be a foundation with a perimeter footer, but I want to know if the posts on the interior of the ...
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Stucco on concrete, order of operations

Our below-grade, painted poured concrete garage wall is showing some efflorescence and mild spalling (see image). I would like to cover it with one or two coats of stucco. I am made to understand I ...
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Home Bball court of concrete

I am looking to make a basketball court in my yard. Probably gonna be around 36’x25’. I think a concrete truck can bring about 10 yards of concrete. Would a 3.5” thick slab be strong enough? Do I need ...
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rotten wood between concrete slabs of floor

When prepping the floor to tile, I came across what appears to be old wood siding between 2 solid concrete slabs in a doorway.It is about a half inch wide a d runs the width of the opening. A ...
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Gluing Post Base To Concrete

I recently found out that one of the posts which support my roof is free to move around. The post bracket had rusted out and came out. Is there any way I can glue a post bracket to the concrete using ...
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Layered with crushed stone for concrete slab, but heavy rain came

We just got done compacting dirt, filling with 3/4" crushed stones and compacted it again ready to pour concrete. However, extremely heavy rain came. These guys are telling me they really just ...
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What type and size of wood should I use to make a form for concrete?

I am a complete beginner and need to lay a concrete slab for my new cabin (about 18 ft by 16 ft in size). I'm planning to lay a slab 6in thick. I'm wondering if there's any particular type of wood I ...
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Sprinkler pipe in concrete

I'm having a concrete deck installed, and I'm keeping a sprinkler pipe in the concrete for use in a drip system. Is it ok if the pipe is PVC or should I replace it with a galvanized pipe?
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Preparing Broken Concrete Hearth Extension for Tile

I am planning to retile my fireplace hearth extension. As I was removing the old tile, the front edge of the concrete bed crumbled away. I presume this was because it was much thinner than the ...
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Will this arrangement of bricks be a good base for a concrete floor for a garden shed?

I am building a 6ft x 4ft garden shed which will have a concrete base. I've levelled some ground, built a frame, and made a floor out of old bricks. The ground is fairly clay-heavy. I've been ...
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63 views

What concrete type should I use for a pizza oven base slab?

I am building a pizza oven and kitchen area in my garden. I am trying to work out if there is a specific type of concrete I need. My question is only about the concrete slab (the foundation). The slab ...
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Precautions for a subterranean level

Although our house build is still several years away, we’ve started making decisions about it. I live in a tropical climate and have always felt a subterranean level makes great sense in terms of ...
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How to fix cracks in cellar room?

I have a question regarding the cellar floor of my 1950s house in germany. It has a concrete floor. In one room there are a lot of cracks in it. They are meters long, but only a few mm wide. When ...
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Leveling off part of concrete slab for floating floor

We are trying to partly level out our slab to build a subfloor. Most of it is level enough but a section that is about 20ft x 5ft starts to slope and fairly aggressively in some parts. I see self ...
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Best way to fix bottoming-out on driveway curb-cut?

The distance between the street gutter and the top of the sidewalk in the curb-cut for my driveway is short making the angle at the crest such that a car bottoms-out when entering or leaving the ...
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What kind of concrete finish was used in this Tulum treehouse?

I'm remodeling my house and would like to finish the walls and floors as done in this Tulum treehouse. Who can tell me what kind of concrete finishing technique was used here? In the linked Dezeen ...
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Secure a 4x4x12 post

I do not want to dig a hole in my yard to install 4x4x12 I am thinking to buy 5 Gallon bucket and put the 4x4 in it and fill to the bucket with concrete cement. Of course I will mix it with water. I ...
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Uncoupling membrane on new concrete

Tiling my basement floor, but had a big heave in it from tree roots (tree now gone). I cut out all around the heave, removed old concrete, rebar’ed and jointed into old concrete and poured a new slab. ...
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Pouring a concrete slab porch onto corrugated metal with no cross support

We are building a front porch that is approximately 8 feet off the ground. Our builder laid a piece of corrugated steel down that he supported on the front with the center block wall and brick and a ...
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Purchasing agent to air entrain concrete

I would like to mix up a few cubic feet of air entrained structural concrete so I can repair some water damage to an exterior wall on my New England home. (Recommended by a local professional mason to ...
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What are the green spots on our kitchen walls

Our kitchen has one of the main walls of our house which is a thick concrete wall. There is nothing behind the wall, just some empty space and then the neighbor's house. I just painted the wall with ...
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How to install a concrete subfloor indoors?

The previous owners of our house enclosed a sunroom with stucco walls. The floor is old cobblestone and brick pavers with dirt underneath but they covered it with a cheap carpet. We're planning to ...
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How to best deal with cracks in concrete?

My backyard has cracks in the concrete. The previous owners used concrete crack sealant/filler and that has eroded away or peeled away. The options that I’m considering are: (1) use filler again (...
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Should I be concerned about concrete/cement sealer fumes?

Full disclaimer, I don’t know anything construction really and this is not a project I am working on. Our rental unit is having the balcony redone right now, the flooring is pebbles embedded in cement/...
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Floating floor over old mastic?

I recently had carpet and asbestos tile tested and removed from my basement, and now am left with concrete covered with black mastic (non-asbestos per testing). I would like to cover the floor with ...
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What is this pipe? It leaks when the sink runs

I have a pipe that is halfway under a door jamb and inside the concrete floor which when I run a the sink water is now coming out of it. This pipe is next to our AC blower unit inside the basement. I ...

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