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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73 views

Depth of hole when burying a 2 inch schedule 40 pole

How deep of a hole do I need, and how much concrete is needed for 21 foot tall 2 inch steel pipe schedule 40 pole that will be free standing? There will be a 19 foot tall antenna on top of it....
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251 views

Shower drain height for curbless tile shower

I want to do floor tiles for the shower and it must be curbless. It is the basement and has concrete foundation. Right now the drain I bought is sticking up 3" from the concrete floor: This is the ...
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How serious is this spalling?

Spalling is occurring on the corner of the top of the first story. I'm curious as to how serious this is.
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What product should I use to reseal an aggregate patio?

The surface was never really "smooth", but metal patio furniture with plastic gliders on its feet used to move easily across it. Now, the surface is rougher and pebbles are loose and get washed or ...
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40 views

Domed concrete floor (garage) needs leveling

I am about to replace a 14ft wide garage door. The concrete floor is domed in the centre of the doors width. The mid section of floor is roughly level for about 6 feet wide but falls away each side ...
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74 views

How to deal with a small concrete patch in hardwood floor install

I am installing 3/4 inch oak throughout my first floor. The install is over the original pine, which sits directly on the joists. I put 1/4 OSB over the pine (due to a number of factors 5/8" wasn't ...
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743 views

How to increase part of existing internal concrete slab by 300mm

I have a property with a 150mm (6") thick concrete slab throughout. The slab has a step down of approx 300mm / 1 ft, running the width of the house. This means the front rooms are at a higher ...
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195 views

Cutting out beam pockets

Guys that were pouring concrete did not form beam pockets so now i have straight walls with no beam pockets. How can I possibly cut the beam pockets out now? I believe the size is 8 1/2 by 12 1/2.
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100 views

What is this pipe?

I discovered a 12" diameter concrete pipe traveling vertically from the basement to the attic of a one story house. The pipe is lined both internally and externally with metal. I would like to know if ...
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448 views

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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1k views

Shade Sail post on brick/cinder block rooftop surface.

I am trying to install 4x4 wood posts to hold up a rectangular shade sail on my rooftop. The posts will be free-standing with nothing attached besides the sail. Ideally, I would be able to attach ...
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156 views

How can I fix sprinklers inside concrete?

I have two sprinklers that some genius installed into concrete: And second one: One of them is starting to give out. My initial thought is to: Hire somebody to run new sprinkler lines. Cut these ...
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723 views

Sleepers on unlevel basement floor?

A question related to this one about projecting the costs to finish our basement. We have a poured concrete foundation. I don't think it has been sealed yet, but our yard is graded, our downspouts ...
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84 views

How clean does concrete floor really need to be for peel and stick flooring?

We bought an older home and found that there were two layers of peel and stick flooring in the bathroom. We removed those and this is the result of the floor after scraping and scrubbing for hours. My ...
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74 views

Insulation in basement with plaster walls

I’m looking to finish my basement. I have a 1940’s cape cod with a poured concrete basement. The basement walls have a fairly thick layer of plaster to them, very rough looking. It’s and in good ...
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128 views

What is the correct type of anchor bolt for attaching a sill plate to a slab once the concrete is dry?

If you need to install additional anchor bolts after the concrete has cured (and thus can no longer install traditional J bolts), what is the correct type of fastener that can be installed into dry ...
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109 views

Ideas for improving old concrete patio on the river?

My parent's place in NH has this 30+ year old concrete 12x26 patio jutting out into the water. There has been some settling. Off the end of the patio the water is about 10 feet deep. So I'd like some ...
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246 views

How much force can a concrete block fence and wood stud hold when installing a large shade sail?

I have a standard concrete block fence. I want to install a large 20 x 26 foot shade sail, or two 20 x 13 shade sails by screwing hooks into the wall, and the other end into my house via the studs. ...
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50 views

Rust-resistant 4x4 base for concrete?

I've read several reviews about this Simpson 12-Gauge E-Z Base that say that they began rusting after a few months. I wanted to use them, but they'll be used at a house next to the ocean, so I'm ...
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99 views

Dry/cure time latex paint + concrete

Hoping you can help me out here, I mixed latex paint with Portland cement and 24 hours later they're sorta spongy. Definitely softer than I was expecting. Any idea what dry/cure time is gonna look ...
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264 views

Can Thinset be used for covering cement driveway or garage cracks and small holes?

I have small holes and cracks in my cement driveway and garage floor. Can thinset be used to level these floors?
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36 views

How do I make 10 gauge concrete mesh flat for trellises in a garden?

I'm going to be using concrete mesh for a trellis for my plants in the garden this year, and was wondering how I should make them flat, and bend them? I'll also be making tomato cages out of it, so I ...
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597 views

Running 4" PVC pipe through foundation wall

I am installing a radon mitigation system and my plan is to go off of the sump pump (I bought one of those covers that seals it up good and lets you pass a PVC pipe though it). The easiest thing to ...
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1k views

Building Concrete patio against the house with sunken family room for proper drainage

Just acquired this house with challenging problems. When the house was built, the builder didn't care for grading the lot appropriately. One of the rooms in the back of the house is below grade and ...
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236 views

Why is a corner of our garage floor slab all uneven?

Our house was built ~1985, and it has quite a few oddities. One of them is an irregularly shaped corner of our garage. Our garage is ~32' (9.75m) x 32' (9.75m), and a significant section (not square ~...
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322 views

Does my bathroom addition require breaking the concrete?

I'm planning on calling a plumber to give me an estimate on my bathroom addition. There is no basement, it is on the first floor on a concrete slab. I already have a bathroom on the 2-nd floor right ...
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1k views

How can I stop the dripping from a concrete ceiling?

My uncle built a concrete bunker in the side of a hill over 50 years ago. The shelter seemed to be free of any leaks until just recently in which there is a steady drip in a few spots in the ceiling. ...
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29 views

Area Under Exterior Wooden Deck

I have an external wooden deck, and the area underneath it always has moisture which makes it an unusable area. I'm assuming the moisture is because it is shaded almost all the time from the house ...
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4k views

Too little water in concrete

A few days back, after I had finished work at my day job, I decided to pour a slab of concrete for my home's walkway, but did so hurriedly. I had originally planned to do it later during the weekend, ...
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93 views

Can acrylic concrete patch be drilled into?

Can acrylic concrete patch be drilled into? I am using it to fill in some holes in a brick with holes in it where I need to drill into the brick itself and into the area where the patch will be. How ...
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480 views

Is it OK to seal the top side of a deck concrete footing?

This is a follow up for this question Deck footing 2" above the ground -does that apply to a patio? What is the reason behind the 2" restriction? I decided to have my concrete footing under ...
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43 views

Is there a sealant I can use on concrete grouting with concrete pipes?

The driveway at our new house crosses over a creek, which requires 3 concrete culverts, about 16' long and 30" in diameter. The culverts are each made of two pipes with a joint in the middle. ...
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2k views

Vinyl Flooring Over Uneven Concrete Slabs

Our attached garage was added many years after my house's 1959 construction by basically walling in a pre-existing carport. The floor, therefore, is made out of several concrete slabs and part of what ...
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61 views

Would an electric back massager be forceful enough to vibrate bubbles out of concrete in a casting project?

I've been watching youtube videos on casting concrete and would love to give it a shot. Thing is, I'm lazy and don't want to whack my form with a hammer for thirty minutes to an hour. I happen to have ...
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40 views

Recipe for a 2m x 1m concrete working plane

I'd like to create working plane from concrete to be put on a support and be used as desk. The dimension should be 1m x 2m and the thickness will depend on recommendations. It should support 150 kg. ...
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66 views

Pin foundations

Are patented pin foundations worth their price? Would simply drilling holes into a concrete block, driving rods into the ground to frost line depth, and securing the rods to concrete block with ...
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317 views

Placing a manufactured (tiny) home / RV, trailer foundation on stands or blocks

What are the best practices in placing a fairly temporary, a few years with full time use, 10K lb manufactured home/ rv with a trailer foundation on stands/blocks in the western pacific cascades? ...
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2k views

Why is my concrete soft and crumbly after more than 14 hours?

So I'm trying to create a concrete pencil holder but the last few times I've tried, the cement has not dried and comes out really crumbly and is soft and damp and dusty, even after curing all night. I'...
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1k views

How to measure the ratio of a sand cement water mix for countertops

I want to cast a concrete Countertop and I created several test batches. I am confused by what I read and need some double checking. I use a mixture of 1 Part Cement 2 Part Sand and 0.4 Part Water ...
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442 views

New concrete ceiling leaking water

I have hired a contractor to build a patio style concrete roof for my hotel. He is in the middle of construction but when it starts to rain, I can see water starting to leak through the ceiling. What ...
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139 views

concrete grooving

I am looking to put radiant heating in my garage floor. I am looking for some sort of grinder wheel to cut 3/4inch U shaped grooves in the floor for the pex tube. Or would it be easier to cut 2-3 ...
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468 views

How to retrofit a slab for protection from frost heave

One structure on our property is built slab on grade. Located in the US in climate zone 6. This is a heated space which we will be removing part of. The removal will expose a lot of the slab to the ...
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1answer
434 views

Concrete stairs substrate preparation and layering

I need to pour small stair entry into my basement, about 4 steps and it is narrow, with a brick retention wall on both sides. I was going to first evenly grade and pack the dirt, then put gravel, ...
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202 views

How to install bathtub

I want to install a tub on basement bath where drain pipes are already installed and sticking out from concrete floor. I need to know how to raise the level of the tub from the floor in order to have ...
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1k views

How to form curved concrete seat for bench with back?

The contractor seems very unsure of procedure. He has put some very thin plastic around the front edge of the curve, holding it in place with wide black plastic tape. It is about 1.5 inches tall. ...
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95 views

Treating a crack in a concrete patio before resurfacing

I am resurfacing a covered outdoor concrete patio. The original slab has a crack in it due to some heave. I am not particularly worried about this crack, however. The soil below is hard clay, and the ...
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757 views

How to hang shelf on 2cm thin wall?

I would like to somehow saw out a wood board that fits into the corner as seen on the picture below. The problem is that both walls are only 2cm thin. The shelf needs to be able to hold a pair of ...
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1answer
595 views

Raised Concrete patio construction

I'm concerned about the way my raised concrete patio is being constructed and thought I'd do a sanity check here. 14x16 raised screened in porch. Footers, concrete block and brick foundation with ...
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1k views

Concrete porches pulling away from home and cracking

I have an 1940'sish home with old concrete porches (x3) they are cracking, chipping, and pulling away from the home. Would I be able to repair them? If not could I build a deck over them (wooden)? I ...
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1answer
910 views

How should I build a base floor for a large summerhouse?

Hi my question has 2 parts about piles and creating a subfloor. I want to install a 4.8x4.8m (~16'x16') summerhouse; its existing floor is 24mm (~1") floor boards on 75x50mm (~"2x3") floor posts. I ...