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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What is the minimum thickness of concrete above hydronic heating pex

I am doing a diy hydronic heating system in a house I bought in the mountains. For the main part of the house I am using 3/4" x 9" strips of plywood with spacing for the tracks of the 1/2&...
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Can I support 6x6“ deck posts on 10” diameter poured concrete footings?

I am building a new 13x10 deck. So far I have the ledger board in place, and yesterday I finished building 3 concrete footings, 9 ft away from the ledger board. I use tubing, 36 inch deep with gravel ...
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88 views

Suspending a chair lift swing from a single pole

My wife's family used to run a ski area and she has one of the original 2-seater chair lifts when they replaced it with a bigger lift. I recently refinished it as a gift to her and we we wanted to ...
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101 views

Wood siding rests on concrete pad. What are the alternatives?

In several areas around this house (a ranch on slab), the clapboard siding comes right to concrete walkways, resulting in peeling and rot. Short of ripping out the concrete, is there a less ...
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36 views

Flashing EPDM roofing up a short arched vertical portion?

I have an old concrete garage roof that is leaking. I plan to attach a layer of pressure treated wood then glue an EPDM sheet to the surface. I understand how to install a drip edge on the sides ...
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218 views

22kw generator mounting pad on slope

I need to build a pad for a 22kW generator I am installing for my house. The image shows the situation. This generator is quite heavy. I plan to pour a rebar reinforced 6" pad for it. My ...
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209 views

Is there a problem with concrete patio that's next to the house and poured above the house's foundation?

We're currently installing a patio. The contractor has laid it out in a way where the patio will be against siding, and will be above the foundation. You can see on the picture below the dirt base ...
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How to level a sloping concrete slab with a 2” difference?

I know this sounds bad and I need to give some backstory to not sound off the alarms... I’m going to give the main question first and then backstory below so you know I’m not crazy. Question: We have ...
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206 views

Will surface scuffs be a long-term issue in a new concrete walkway?

I'm probably being paranoid but would like to get some expert opinions as this is my first time dealing with concrete. I had a concrete path laid in the garden, around 80-100mm thick. It was laid and ...
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How to anchor railings into concrete correctly

Where I live the most popular way to anchor railings or fence into concrete is a method that I cannot find any reference about it on the web. A 7mm hole is drilled into concrete and then a 8mm steel ...
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Is there a simple way to lower 0.5 square meters of concrete by 2mm?

When I did concreting to raise the floor in my bathroom by 15cm, I accidentally created a bump of about 0.5 square meter, which is about 2mm higher than the rest of the raised floor level. I'm looking ...
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What's the best way to pour post footings under a patio slab?

I am looking to build footings for three 6"x6" patio cover posts which will support a 6"x8"x19ft beam for a 19ft wide x 16ft deep patio cover that will fix to my house using a ...
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Can the foundation for my garden shed be underground?

We are building a garden studio on a sloped ground. I am totally confused in regards to the concrete base. To have an even base we didn't have to dig out ground at the back on the building but the ...
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Rabbeting concrete

I am estimating an approach in which I'd make a rabbet on a soft concrete wall. The dimension of the rabbet are roughly ~2cm x 3cm x 400cm. My initial idea is to find a router bit (wood router) for ...
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Is it required to electrically ground rebar in an exterior concrete slab?

I'm looking for information / references on when exactly it is required to ground / bond the steel reinforcement in an exterior concrete pad, and how to do so. The pad I'm planning is for a hot tub / ...
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346 views

Is the wooden-stud basement wall that runs next to & parallel to the shared concrete wall separating two townhouses load-bearing?

Okay gang, so here's my deal: My wife and I recently bought a 2-story (with a half-finished basement) townhouse, sandwiched in the middle of a row of other townhouses. After lengthy negotiation, I ...
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Levelling deep spots in concrete floor

I have a large room with a corner that goes close to 3" below level. Rather than dumping bag after bag of SLC, it seems like maybe I should use a regular mortar or concrete to get it up to near ...
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64 views

Why is my cement cracking near the wall?

I have an old barn/garage that has mason block walls. The entire foundation is a concrete slab with footings for the exterior walls. For some reason, about 6 inches from the exterior walls, the ...
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cable drum on lawn

I have a large cable drum (5.9'/1.8m) . I will attach a ladder on one side and a slide on another. I wonder how to place it on my lawn. Once I roll it into place I plan to to trim flanges a bit to ...
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48 views

Outdoor concrete repair/resurface/sealing and painting

We have an outdoor patio at my house which was made of concrete, but I don't think it ever got the finishing coat (it was supposed to be tiled but never happened) nor sealed and it has been there for ...
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Running power to a sub panel for a shed

So a friend of mine wants power to his shed for a tv, a small portable ac unit and some lights. I told him a 60 amp sub panel would be best just in case of expansion. So the issue is that from the ...
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66 views

approximate strength of poured reinforced concrete slab

We would like to back a truck over a garage floor recently poured. The slab is 6 inches thick with 1/2 inch rebar in a 2 foot grid throughout. The concrete is a 6.5 sack mix and has cured 60 days. The ...
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Can pressure treated wood be buried in concrete?

I was planning a relatively simple, 6x8ft "2-post" pavilion, just a small structure to provide protection to a small bench. This design would require to bury the wood into the concrete ...
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Finishing Concrete basement floors

Alright! This is a 4 part question! I live in a new build in Ottawa Ontario and would like to finish my basement. Basement is below grade, and the house has been up for 6 months. 1 )I'm planning on ...
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New concrete up to blacktop's soft edge

I want to make a concrete walkway next to a blacktop driveway. This is on private property, and the total length of the walkway will be about 20 feet. I don’t want a curb, and I want the concrete to ...
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103 views

How to prepare vertical brick surface so Portland cement based mixtures (concrete, mortar) will adhere properly?

I have a sub grade vertical stack of perforated brick (foundation) which I need to coat in a thick layer of mortar or concrete in order to fill gaps, creating a flat surface for subsequent painting/...
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126 views

how can I kill Insects that are boring holes in concrete

I have insects that are boring holes in my driveway and garage floor. Are there any remedies that would kill Them?
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66 views

Drilling into foundation form ties

I am in the midst of waterproofing the interior side of my basement. I have many leftover form ties that I've cut off flush with the concrete. The ties originally looked like this: My waterproofing ...
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Installing a sill plate on a crawlspace for a manufactured home. Does it matter if I use spf white wood or treated?

What type of wood should be used on a 8 inch cement block wall crawl space for a manufactured home. Spf white wood because of the metal I beams or treated lumber.
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how to repair large crack going down length of garage?

My garage floor has a large crack in it that runs the entire length of the garage (approx. 20'). The crack is about 1/3 the way into the center of the garage. and a slab has sunken. my brother in law ...
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Why should you add dry mix to water and not the other way round

During renovation I have used all kinds of dry compounds, be it mortar, conrete mix, tile glue, grout, plastering mud, ... On every one of them the instructions say to add the dry mix to water and mix ...
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162 views

Proper demolition hammer selection for stone wall and concrete steps

I’m looking to replace a wall under my deck, and to remove an old set of concrete stairs under same. I’m currently researching the project, and hoping to do it this fall in cooler weather. The stone ...
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Blending new concrete patch fix

I'm back for another concrete-related question: I previously asked Fixing broken piece of concrete and got great answers from folks here. I went to HD this weekend and finally patched up the broken ...
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How to fix low spots in concrete slab

I have a couple exterior concrete slabs (walkways and pool deck) and although the slabs are slopped, in some area water is pooling. Looks like there are some low spots, creating 1/16" deep ...
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137 views

Can I build an extended shed base around an existing concrete base?

I recently bought a house that has a garden around 20ft wide. At the end of the garden is an old shed (6ft wide x 9ft long), about a ft away from the fence. Given it only takes up half the garden ...
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1answer
69 views

Replacing two fence posts within a 32" span

I had to dig out two badly rotted fence posts with cracked concrete. These are roughly 2' deep to accommodate a 4' post. These are so close that I'm really wondering what to do about this middle ...
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How do I reverse the slope of my garage floor?

When I built my garage 25 years ago, the concrete contractor nixed my idea of installing in-floor drains under each car "bay" and assured me that he would slope the floor toward the garage ...
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Level Concrete slabs

We bought our house and there is a shed in the yard that was 2 sheds right next to each other. It was recently torn down (not by me) and rebuilt. It's nice to have one single space the only problem is ...
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concrete blocks

can you use the large interlocking concrete blocks(1600mmx800mmx800mm) to build a house? Would you use extra cement or would you it be safe and strong with the right structure to withstand hurricanes? ...
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124 views

Do the posts for a carport sun shade need to be embedded in the ground?

I have an existing concrete area approx 10'x16' at the back of my carport. I want to install a sun shade/sail over it and have some questions on installing the posts I need. Can I use the existing ...
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2answers
322 views

What would be the potential pitfalls in pouring a concrete patio over deck footings and then securing the posts to the slab?

I am going to have a 4" concrete patio poured in my backyard, and over that I want to build a 2nd story deck. All of this essentially occupies the same space, meaning the posts either need to be ...
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3answers
47 views

How can I cut slots in the ground to install insulation panels?

To build a geothermal greenhouse, I need to insulate a thermal mass -- basically the ground directly the greenhouse. The insulation will be for the underground "walls" only, no floor, and 5 ...
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124 views

Anchoring post brackets to textured concrete slab

I want to bolt posts to a concrete patio to make a roof. The surface of the concrete has texture to it. I figured the texture is meant for a better grip in wet weather. Should I smooth out the ...
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1answer
149 views

Concrete Footings for 16x24 log cabin

I am buildings a 16x24 log cabin in rural West Virginia. It will not have electric, running water, or any type of HVAC. One of the biggest worries I have, as I feel I should, is the foundation. I am ...
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854 views

Concrete was TOO dry?

I am building a tree house. One side of it will be supported by the tree. The other with two 6x6 8' pressure treated posts. I wanted to support those posts with concrete footings. So I dug 24" ...
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4answers
2k views

Pouring concrete over rocks

Need a bit of guidance here, I have tough yard and my contractors are going to pour concrete over some large boulders and filled in the remaining area with parts of other boulders (6in to 1 foot). ...
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1answer
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Fixing broken piece of concrete

We have concrete stairs leading up to our front door. I noticed today that a medium-sized piece of concrete is cracked & broken off at the corner of the stairs. I don't really care about the look ...
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908 views

Lay a damp proof membrane followed by a self levelling compound

I have an uneven concrete floor inside. I need to put down a damp proof membrane and self levelling compound on top of that. My questions are: Is there any reason to use a roll of DPM vs a liquid one ...
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115 views

Attaching wood railing to cement

I want to remove the metal railing and put in a proper wood railing. I was planning on cutting the pipe flush with the cement and then using a bracket to connect my 4x4. However, when they put in the ...
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1answer
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Concrete floor brick wall gap leaking severely (garage above basement)

Basic Problem: There is a somewhat badly maintained car garage at street level above an area of my basement property. The garage has a concrete floor; the (very small) utility room below has a solid ...

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