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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Foundation for structure on bedrock

We have the mixed blessing of a giant swath of exposed Canadian Shield on our property in Ontario. Literally a big flat area of exposed rock, no soil whatsoever. Scale is hard to see, but a ...
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50 views

Can a slab under load be concrete jacked or otherwise supported without taking down the wall?

I have an issue with soil erosion below the front corner of my garage floor which has caused a crack to form and a piece of the slab (~4sq.ft) to sink. This in turn is affecting the portion of the ...
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22 views

Damp concrete floor in bedroom

Had water overflow into bedroom and closet. New laminate floor removed. Concrete floor has glue strips from another flooring that is sticky in some places. Will thoroughly clean with as little water ...
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336 views

Help! enclosed porch/sunroom foundation

We just purchased a home and now that the snow level is not 4 feet high ( we live in central NY ) we see that the concrete patio/foundation has horizontal cracks, and crumbling along the side, corner ...
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207 views

Can I add cement glue and sand into my concrete mix to repair my cenent garden statue?

I have a leopard concrete garden statue that was given to me by my neighbor that has a broken foot and log. I want to repair it and paint it. It also has been weather eroded so I need to recover it as ...
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290 views

How do I level a summerhouse concrete base that dips in the middle?

I laid a 4x3 metre concrete base for my summerhouse/office thing. The corners are all level and so the summerhouse sits fine, but it dips in between and so the load bearing battens aren't taking any ...
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61 views

Is 50mm deep bedding sufficient to hold a 150x50mm kerb?

This is a fairly good link about bedding and haunching edging. http://www.pavingexpert.com/edging3.htm However it fails to indicate the minimum needed bed or sub-base depth? I have included a ...
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45 views

Need advice on deck posts that will have concrete poured around them

I have a raised deck, attached to the side of my house on one side and held up by three posts on the other. Under each post is a small cement pad and the posts bracketed to those with a buffer piece ...
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18 views

Easiest way to replace mortar around door?

I have a stone house and some of the mortar around one of my door frames has completely eroded away, there are big gaps and I can now see the screws that once screwed into the mortar too hold the door ...
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29 views

Description of Concrete Classification Numbers (e.g. C15, C25 etc.)

I was reading my plumbing code and came across mysterious concrete classification numbers like C15 and C25. I tried googling it and only came across a couple of sources describing these numbers (like ...
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86 views

What is this landing/wrap-around feature on porch steps called.

What is this style or feature called? If it has a name...!
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87 views

Is there a purpose for the concrete border at base of this house?

My wife and I are in negotiations to purchase a house that is located in the Southeastern US. The home inspector was a bit baffled by the concrete border (first image) that runs along the back and ...
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27 views

Proper method to seal a heated crawl space

I have a heated crawlspace with a dirt floor. There are no vents, it is fully connected to the house, and currently has a pool liner and vapour barrier stretched over it, but it is not sealed. There ...
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67 views

Monolithic frost proof shallow foundation, advice on the smaller details?

I'm building a 16x24 shed/garage. I have done most of the site work and I have a concrete guy starting tomorrow on the forms in preparation for a pour on Friday. He's done insulated slabs, he has 30 ...
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40 views

How do I finish a concrete floorÉ

My basement has a concrete floor that is all jagged. It`s missing about 1 1/2 inches of concrete to be even with everything else....what do I do?? Will self-leveling cement adhere to such a jagged/...
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26 views

How effective is elevated concrete for insulating moisture?

I am replacing a boiler in my basement and the contractor told me it will be better for the new boiler if he build an elevated concrete platform on which the new boiler will sit. He says this will ...
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41 views

Replacing Kool decking

I want to replace my cracked and bumpy Kool deck. What do I need to do to take it completely off my pool deck?
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566 views

Do I need a header for an egress window?

I am in the process of finishing a bedroom in my basement. I need to add a window to the room and the selected wall is poured concrete. I need to know if I have to add a header above the window in the ...
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34 views

Repairing concrete block on inner part of basement

I have had water seepage into my basement through concrete block for many years. The exterior part of the block is covered by a deck and patio and is not easy to get to. I've mitigated a lot of the ...
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151 views

Installing an 18kg (40lb) projector screen onto a concrete ceiling

I have a large projection screen that I need to install into a (seemingly) pretty stable concrete ceiling -- at least that's what I assume it is -- it sounds very solid when hit with a hammer, ...
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594 views

How can I fix these cracks in my concrete/plaster wall apartment in Paris?

I'm used to working on sheetrock in the U.S. but I now live in France. In my old apartment in Paris, the walls seem to be plaster but could be concrete. It is soft enough to make divots if I dig in my ...
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149 views

How to fix concrete delamination

When I made some concrete flooring (my first time doing it) I finished the surface while there was still bleed water (I didn't know it better back then). Now 2 months later in a few areas there is ...
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114 views

Repairing/patching concrete foundation of house

What's the best (or maybe easiest and most affordable would be more accurate) route to patch the concrete of our house foundation? It's kind of crumbling in places and needs a facelift. Ideas/options?
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230 views

Should a concrete pool look like this after an acid wash?

I'd like to redo after the contractor who did an acid wash of my pool: But before I start, I'd like to understand (since I have never seen the pool acid washed before): is that what "the product" ...
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211 views

Is this vertical gap in the concrete block foundation something to worry about?

I'm looking at a home that has a vertical gap or crack running the height of the exposed concrete block foundation. The crack is near the center of the home, about a foot to the right of the concrete ...
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446 views

How can I edge concrete without an edge trowel?

How can I make a concrete floor (also using dry shake color hardener) with a proper edge, without using an edge trowel? In Brazil I cannot find an edge trowel anywhere, so I would like to know if ...
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159 views

Repairing exterior cement wall

I have an exterior wall on one side of a brick building that appears to be stucco or cement. Some of it is starting to come off in sheets. Basically, there is one layer, maybe the thickness of orange ...
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157 views

Applying thinset to concrete floor

I am planning to install ceramic tiles with a "Warmup" heating element beneath them. My first step is to install 1/4" insulation boards on the concrete floor using non-modified thin-set. The floor ...
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768 views

How do I repair cracks in the concrete pillars supporting my patio roof?

I have two round concrete pillars that support my patio roof. I have noticed that they have cracks even though they are new. I suspect the filling of mortar and bricks inside those pillars was not ...
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341 views

How can I tell if I've got Cool Deck installed?

I have coping around my pool that I thought was Cool Deck. When I started researching "How to repair cool deck", I noticed I do not have the uneven (up and down) pattern) my coping is smooth and ...
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3 views

Concrete drain across drive

I have laid a 4 meter wide drive with 803 ( basically stone to dust) and need to make a concrete open channel drain across the drive to control runoff. There will be occasional 10 ton lorry movement ...
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25 views

Are pour-your-own concrete tiles safe for use as fireplace cladding?

The fireplace in our new house is unadorned and I'd like to use concrete wall tiles for the cladding. I am interested in the idea of pouring my own tiles (like this) and I'm wondering whether DIY ...
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12 views

How should I fix a railing to a suspended concrete slab

I am building a suspended terrace as per the image below The terrace is 1.5 metres deep, and has two long sides of around 9m and 4.5 metres. At A, B, C, and D are concrete foundation piers We ...
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23 views

What type of bedding mortar/concrete for driveway entrance

I am currently updating to a new gravel driveway for our house, and all the kerb edgings are now in. I need to add 2 rows of small square edging stones at the drive entrance. As these will be ...
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22 views

Surface Water Drain Solution Between House and Retaining Wall

My house is a old colonial cape built in the 1800s that has had additions built over the years. The original house was built into a rocky hillside with a very shallow pier and beam foundation. The ...
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12 views

What are the steps or phases to prepare a basement for finishing?

I've got a small house with an old finished basement, and want to refinish it. I've removed most of what's there (carpet, panel walls, old ceiling tiles, floor tile, etc) and am at a point where I ...
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28 views

Insulating Concrete Forms

Has anyone had bad experiences with using insulating concrete forms, either during construction or, once built, seeing moisture/mildew or having termite problems?
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39 views

Joists \ sleepers for decking over concrete patio

I'll be getting a 10x12 concrete patio attached to the back of my new house - not my first choice, but that's what it is. I wanna put Trex or some other composite decking over the concrete patio - I'...
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40 views

What product can I use to level an uneven garage floor?

I have an uneven garage floor that goes up to 1 inch deep from high to low level spots. I want to make the garage even. I was thinking of a self-leveling compound (watery). Which brand or type should ...
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19 views

Concrete “post footings” for concrete patio floor?

The typical way of doing a concrete patio floor is to excavate soil at least 9", pour & compact gravel, then pour concrete. I was wondering, what will happen if: Excavate post holes, past the ...
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12 views

What to Look for in Professional Products for Vapor Sealing Concrete Slab

I'm planning to seal a concrete basement floor soon. While I haven't had any water problems, the basement has a smell to it which seems to be the smell of the soil/clay underneath the house. What's ...
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32 views

Load-Bearing (?) Cinder Blocks Half-Corroded Away

In preparation for patching and repairs, I knocked down all the loose material from an old, water-damaged wall. In the process, I discovered an area where a couple of the cinder blocks underneath the ...
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55 views

Ideas on how to hide sprinkler wires?

Just figured out how to wire sprinklers (yay!) but I've left myself with this pretty ugly situation. I was thinking of hiding the wire below the stone, but I'm not sure how to hold it. Can I drill ...
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54 views

How do I repair a few broken concrete blocks in a stoop foundation?

I have a ranch home built in the 1960's. It has a full foundation under the front stoop. The stoop is a concrete slab. Settling over the years led to horizontal cracks about 36" below grade. In ...
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37 views

Failing foundation outside wall looks like it is buckling but it's not

My contractor poured a grey beam on the outside of the failing wall but it over time made it worse. I was wondering if I make a 3 plate beam out of 2 by 10 approx 20 feet long put it on the inside on ...
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57 views

Can a seat wall and fire pit be built on existing pavers patio?

I have an existing circular area in my uncovered paver patio area. I would like to have two curved seat walls, either stucco or stone veneer with flag stone or cement seats and no back, and a fire pit ...
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65 views

Retrofitting a sloped bathroom floor

Current Situation I have a ground-floor bathroom (2.1m x 2.7m) with a level concrete base which has a smooth finish with some type of self-levelling aggregate. At present the concrete is covered with ...
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161 views

Stem wall forming questions

I'm getting ready to build a new detached garage - excavator coming this weekend! After getting a few bids, I've decided I'm going to pour the footer & stem wall myself, and contract the flatwork....
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52 views

Concrete Slab touching siding and accumulating moisture

In my house there is a concrete patio which is touching siding and foundation. Since the grade of the patio is not correct near the place it touches the siding water puddles in it after rain. I am ...
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75 views

Cracks in basement cement just poured

I saw this in my wall that was just poured. Contractor says its not a problem, I think it is.