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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Options for laying plywood subfloor over concrete slab

I recently finished installing solid hardwood over a new 3/4 plywood subfloor on a concrete slab, and while it looks nice, the installation process wasn't ideal due to variances of up 3/16 to 1/4 of ...
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Concrete footers, adding height to existing

I have an existing deck with posts in footers. The footers are below grade and the posts were backfilled with dirt around them before a concrete patio was poured around the posts. The posts are ...
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1 answer
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Looking to replacing rusty basement ceiling beams

I have a basement of 9 feet high and on it is my driveway. I had significant water leaks and then discovered that the metal beams of the basement ceiling are all super rusty. I want to resurface my ...
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How much concrete and how thick does it need to be to support 75,000 lbs? [closed]

I’m having a 28ft x 20.6 ft. concrete slab poured to support a 75,000 lb. above-ground pool. What PSI should be used and how thick thick We were thinking 6 in. and 4000 PSI with 3/8 inch rebar to ...
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Was this patio brick mortared to the concrete slab below while the slab was still curing? [closed]

I am removing the brick with a demolition hammer, coming at the brick from an angle to dislodge it. Some of the surface of the concrete slab (which is at least 24" thick) is coming up with the ...
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How to level sloped concrete

I am using concrete bricks for an outdoor fireplace base. The concrete slopes downhill. Can I use cement patch to raise it 1/2" over 5' x 30 " span?
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How to seal very old concrete to hold water?

I have an antique home-made concrete birdbath. It no longer holds water. How can I seal the bowl so it will hold water again? Tried swimming-pool paint in the past but it didn't work.
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How to make a 2 feet long concrete pillars for deck posts in Quebec

I live in Quebec and I read articles from CAA and Rona (Lowes in the rest of Canada) stating that the concrete pillars for building decks posts should be between 4 or 5 feet tall in ground below the ...
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I want to remove a garden bed which is on the side of my driveway and fill it with concrete. What do I need to know?

The photo shows the either end of the garden bed along a driveway. Garden bed is not very well built and uses a mix of assorted bricks. The size is about 15m long and 0.5m wide. I have no idea how ...
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Fill the foundation cinder block?

Removed carpet from a lower level walkout in a 1985 Minneapolis house and found the patio door is set on the cinder block foundation wall. Planning on installing LVP. Should I clean the detritus and ...
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Removing a vintage breeze block (decorative concrete block) wall

Can anyone offer any input on how i can remove some vintage breeze blocks (decorative concrete block) from between 2 concrete walls? The block wall is 3 blocks high and 7 blocks wide set between solid ...
1 vote
1 answer
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Fill and redrill curtain holes (concrete ceiling)

I have an apartment where previous owners have done a lot of holes on the concrete ceiling for very long a curtain rail. They removed the curtain and the plugs and sealed the holes with single no more ...
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2 answers
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Crack across front of garage floor

I have a crack across the entire front of my garage floor. I believe that the crack was caused by a poor drainage issue that has been corrected. The drainage issue also caused the pavers in front of ...
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gravel under concrete slab? is it absolutely required?

so, I have a post-frame shed, 12x16. there are posts at 6' on the short sides and every 4' on the long side. posts are set ~18" below grade, on a 2" cap of cement over a few inches of well compacted ...
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Concrete First or Asphalt First

We have a long asphalt common (5 residents share it) road, 25' wide x 550' long, that terminates at a City road. The asphalt is old (30+ years) and in bad repair, so we want to replace it and add ...
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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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Why can’t my hammer drill drill a hole in concrete?

I do have a hammer drill (Bauer 7.5amp, Harbor Freight) and some 1/2“ Bosch masonry hammer drill bits. I‘m trying to drill a hole into my concrete patio. I have made it one inch deep but that ...
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1 answer
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What should I use to fill drilled concrete holes that are not used anymore?

Just wanted to do some home repairs and found lots of old drilled holes. I've used putty to cover them up but it occurred to me that there would be air gaps for the holes as the putty cover over them ...
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Recommended materials for molding concrete tiles?

I've made a few test silicone molds to cast custom pentagonal concrete tiles (each about the same area as an ~18" square) for a ~200 sq. ft. residential patio; I've had good results using 'Mold ...
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Okay to seal the gap between concrete foundation and sill plates from the outside using caulk or spray foam?

My house doesn't have any gasket between the sill plates and the concrete foundation, so there's some gap between the two (see red circle on the photo, which was taken from the ground facing up). I ...
2 votes
2 answers
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How to protect 2x4 deck framing from ground moisture?

I am building a deck on a concrete patio. The patio already does have a roof. It won’t get too wet during a rain and we don’t get much rain during the summer (Northern California). I plan to do the ...
1 vote
1 answer
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Concrete anchor distance from edge [duplicate]

I've got a concrete pad in my backyard, installed by a previous owner. I'd like to build a pergola on it. The woodworking aspects of this project are entirely within my capabilities. One thing that'...
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What kind of standoffs are used when attaching expanded metal concrete-reinforcing mesh

Are there special-purpose standoffs made for securing expanded mesh to concrete? I want to fashion an extruded L-shape using expanded metal mesh in order to repair a crumbing concrete edge and hope to ...
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1 answer
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Roof overhang post rotting

I'm looking to redo part of this deck and found that the 4x4 post supporting the overhang has started rotting at the base. The frost line here is 48'', and after digging about 10'' I haven't hit any ...
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2 answers
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Bottom wall getting dirty

I have an 8 foot retaining concrete wall. I painted it a few months ago, but it seems that when the water hits the soil it jumps back up and hits the bottom wall covering it in dirt. I was wondering ...
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How to add a sand finish texture to cement skimcoat

I am building a house in the Philippines. It is cement block construction ant the interior walls have been skim coated smooth. Not painted. What I am trying to accomplish now is to apply a "sand ...
3 votes
1 answer
139 views

Quieter drilling into concrete

I need to drill some 1/2 inch holes in a 4 to 5 inch slab. A typical hammer drill is going to give us 90-92DB. I'd like to knock that back maybe 8-10DB to around 82-84DB. is that possible? Are ...
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1 answer
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Should I set sunshade posts in concrete or on piers?

I have a concrete pad that is 12’x22’ that is standard 4” thick that we use for an outside dining area. We would like to add a sunshade to cover 90% of the concrete. The height of the sunshade will be ...
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How should I repair cracks in my basement slab?

The slab in question as been down since 1973. I've been in my home for 16 month and noticed almost straight away there was water coming up the side of the base till I could see it. I've been telling ...
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1 answer
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How do I fasten NM cable to a concrete wall?

I have a finished basement with some concrete walls, and romex running along the wall (which will be behind drywall). How can I fasten the NM cable to the concrete to support it? It is not running ...
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1 answer
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Efficient way to demo out a few square feet of half inch too high concrete

There is a very poorly laid basement slab that is high by as much as half an inch in some spots. Is there any means short of renting one of those large/expensive standing professional concrete ...
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2 answers
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How to treat Termites around concrete areas?

I'm having an issue with termites at the back of my house where there isn't any dirt/soil for at least 10-12 feet in every direction. https://www.youtube.com/watch?v=H7rW_TSBHJ4 After watching this ...
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Is the proposed solution to this masonry project okay?

We will going to build long interior, round(little bit) shaped staircase (similar to this) from concrete, and I needed to get instructions with physics that it will possible to make it without any ...
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1 answer
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Is this mold on my concrete slab foundation?

Is this black stuff mold on the concrete foundation? In the process of replacing the bath/shower plumbing and fixtures I started chasing mold from the surround. As I followed the trail underneath the ...
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Butt joint concrete table

I am building a 4' x 10' concrete table top. Because of the weight of the top, 2" thick would be around the 800 lbs range, I am breaking it into 2 parts. This will create a butt joint and just ...
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What's the minimum distance between holes in a concrete wall?

I'm fixing a pull-ups bar to a concrete wall. I need to drill some 15/32'' holes, but I have the feeling that two holes in the metallic frame are too close to each other. They are less than an inch ...
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1 answer
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Block wall drilling considerations

I've recently moved my woodworking space into our house's basement garage. I want to mount some french cleats on the blockwall. Far as I can tell, the walls make up the foundation and are load bearing ...
2 votes
0 answers
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how to repair a concrete patio slab with crumbling edges

A brick-on-sand patio was added to the house back in the 1970s atop a poured concrete foundation that goes down 36", below frost-depth, per local code. A brick-veneer was adhered with mortar to ...
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1 answer
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What type of mortar for foundation blockwork below ground level?

I'm building a shed / outbuilding on some ground that is prone to water logging. I already have several concrete pads on top of which some aggregate concrete blocks will be placed to raise the ring ...
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1 answer
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What should I do to prepare chipped cement surface for tiling?

Here is what it looks like on the porch, it has these groves that were created by the builder or whoever poured this The porch is like above and then here you can see the edge of the porch and the ...
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1 answer
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I laid my back patio flush with the back door. I know this isn’t right, now what do I do?

I paid a family friend to lay a concrete patio attached to my back door. He laid it too high. Specifically flush with the back door. I know now this can be a big water issue but can’t imagine how to ...
2 votes
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How long can a concrete pool stay empty when ground water is not a problem?

I live in Las Vegas, you know- the desert. Ground water is not a problem here, when it does rain, it either evaporates incredibly fast or is absorbed very deep very quickly. I also live on a small ...
12 votes
1 answer
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Is it OK to install a concrete slab without mixing?

Going upon the advice of a reputable builder, I used Quikrete fast-drying concrete for a small slab outside my house. Not load bearing. His recommendation was to dry-pour the whole thing. Framed, ...
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1 answer
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How to fix a collapsed section of garage apron?

We bought a house last year that has a broken chunk of concrete near the joint where the garage floor meets the asphalt driveway. I noticed on the other end of the garage (2nd photo) there's a gap ...
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1 answer
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Patio cement floor water seepage

16 year old enclosed patio cement floor with water seepage. No cracks in floor recently started. Only happens when it rains or melting snow. Can I apply a sealer to concrete floor after it completely ...
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1 answer
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filling sunken living room with concrete [closed]

While I have found a lot of information already about anchoring or dowelling the new concrete floor to the existing slab, I have not found anything what to do with my outside wall, which is at the ...
1 vote
1 answer
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How do I stop water leaking from a concrete slab porch into the rooms below?

My front porch is concrete and is above a portion of my garage, laundry room, and a basement bathroom. The house is in Zone 6b: -5 to 0 F. The rooms are not finished and I am not sure of the ...
1 vote
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Sufficient Concrete Thickness for Table?

I'm planning on making a Concrete patio table. My plan is to make a 6ft x 3ft Concrete top. The frame will be 4 legs. I will have 3 aluminum angles running vertically underneath the length of the ...
1 vote
1 answer
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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. ...
7 votes
4 answers
9k views

Pure concrete hollow cylinder

My intention is to build a hollow concrete cylinder for a fire pit like this: There are a few people who have done this by using steel sheets bent in to shape with supports between, but I would ...

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