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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Will mortar or cement bond tightly to granite bedrock?

I want to build a small berm to deflect runoff from a granitic outcrop that slopes under a building and has caused rot in wood sill. This is in NH where we have large temperature swings. What kind of ...
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Can I use the crushed remains of an old concrete slab as a base for a new slab?

I have recently broke up my old concrete shed base which was 100mm thick, I also have quite a lot of gravel. The broke up shed base is quite large chunks of concrete so could I use that a long with ...
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How do I calculate how much sand, cement and water I need for a specific volume of concrete?

I am using forms to build a decorative wall. The instructions say I need 38 liters total per form. The form ends up producing a wall section 200 centimeters long x 50 centimeters high. How do I ...
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what is best vapor barrier for second floor bathroom on a concrete slab?

My question is about the separation of the bottom of the 2" concrete slab I'm installing as subfloor to my second floor bathroom, and protection of untreated wood beams and joists in 1876 house: I"ll ...
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Should pergola posts be set into concrete, or elevated with chemical anchors & footings?

So I have researched this extensively online, but the results are contradictory. Some will say 'set in concrete', others 'set in gravel' and them some will advice 'compact the surrounding dirt'. All ...
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drill concrete for installing tack strips

I'll planning to replace carpet in the basement and will need to install tack strips on the concrete surface. I know they sell tack strips with presettled sturdy nails for concrete. So do people ...
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concrete slab weight

Can you please give me the weight of a concrete slab the measurement is 2.5 X 2.5 metres Thickness 8cm This is for the purpose of disposing this amount concrete to waste management (Council Tip)
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How do I get a lawnmower in and out of an old barn?

I have a barn/large coup built in the 1890s in my back yard. It's foundation is just a 3 foot deep concrete pour around the perimeter. Later they filled half of it with concrete on half the floor. ...
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Will this concrete fence base heave/break during winter cycle?

I live in Ontario, Canada, and the requirement for posts/bases is 4-feet deep in the ground, taking the frost line into consideration. Now I saw this in Google images. I was just wondering if I can ...
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Replace permatreated 4x4 Hand rail post on step where concrete holding it has cracked?

I bought a home 8 months ago where the deck handrail was planted at the edge of a concrete step as a 4x4 on the bottom step. The concrete at the edge of the step has cracked, the hand rail is wobbly, ...
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Best Concrete for Pet Headstone

I spend a lot of times on other areas of stackexchange, but this looked to be the best place to ask the following question. Feel free to let me know if it isn't. I'm going to layout exactly what I'm ...
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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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New home build - cracks in basement concrete floor

PicturesI have a new house under constructions and recently found many many cracks have developed on the concrete slab in the basement. The worst run along straight lines where the sections were ...
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63 views

insect eating holes in concrete

My sister has an infestation of winged insects eating through the cinderblocks of her basement. Needless to say, this is terrifying. What are they and how do you control them? These insects bored ...
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What size wedge anchor for basement walls sill plate?

What size wedge anchor do I use to attach the sill plate to a poured foundation for a non-load bearing, interior basement wall? How do I know what shear load the anchor needs to be good for? For ...
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24 views

Microtopping over plywood

To achieve a modern look in our upcoming remodel we are considering doing microtopping over plywood. This should give us the concrete look we are after without pouring concrete (which we can't do ...
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poured piers for deck but j-bolts are loose

I've poured some piers for a deck (deck will be ~20 inches off the ground). As I was tightening nuts that hold on the fitting, the j-bolts kept getting loose. On the first one, I re-tightened a few ...
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31 views

Toggle Bolts in Concrete Ceiling

I want to hang a baby bed in our bedroom (less than 20kg /44lbs). I drilled a hole into the concrete ceiling.. which i was expecting to be quite thick, but its actually only about 4cm (1 9/16") depth!...
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Looking to install either tile or pavers over a concrete slab in questionable condition that slopes toward my house

I'm an owner builder who grew up building houses with my dad. I recently purchased a long-term investment property in Los Angeles and am in the home stretch of a 3 month project. It's done a pretty ...
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Is it feasible for one person to level a 12ft wide concrete foundation slab on their own?

I need to build a concrete foundation measuring about 4.9m x 3.7m (16ft x 12ft). I'll make the formwork and then get a company to lay the concrete for me. The concrete will be deep enough not to ...
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Concrete countertops ghosting fix?

I just poured my very first concrete project over the weekend and made what I think is a rookie mistake. Somehow I have ghosting from the metal wire that I used as reinforcement. As you can see here:...
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3 concrete solutions OR do I need an engineer?

The home we moved into recently has a cracked and slightly sunken garage floor. We received 3 wildly different suggested solutions. I'd like to know if we need an engineer's assessment. We believe the ...
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What causes air voids in concrete?

Really have no idea on what causing concrete to have air voids in it. Is it causes by evaporation of water during the hydration process?
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Grass feed rust stains on concrete

Applied recently "Scotts® Green MAX™ Lawn Food" to my lawn without knowing that the iron could stain my driveway concrete and ended up with some very ugly rust stains after the rain came down later ...
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Concrete pour against green board [closed]

I'm having a new concrete floor poured in. its going to be 4 inches. The drywall that will be in contact with the cement is green board(moisture resistant). Will that be ok? or should I cut the ...
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Use both self-leveling compound and anti-cracking compound?

I have a home built in 1998 that had a carpeted basement (with kitchen and cabinets atop the carpet). The plan is to replace this with porcelain tile. In the concrete subfloor is a hydronic heating ...
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How big a footer do we need for 4x4 posts on a raised 90 sq. ft. porch with roof?

We are repairing a 6'x 16' raised porch, about 5' high. We want to add a roof. How wide and deep should we make the footers for the 4"x4" posts? Should we cement them in the hole or should we use ...
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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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Can I use construction adhesive alone to attach pressure-treated wall plate to concrete floor?

Replacing walls in basement due to flooding. Contractor installed sump and drain pipe around the inside of the cinder block wall. I want to put in new wall, concerned that TapCon or other hammer/gun ...
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Can you lay hardwood on concrete floor using mortar and grout?

Is it possible to lay wood planks on tile mortar and grout in between with 1/8" gaps, like you would tile. I have a concrete slab sub floor that is all above ground level. I live in North Central ...
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How can I remove or level grooves in thinset mortar from a concrete slab?

I'm redoing my bonus room, it's close to 300 sq ft and the floor is all concrete. Most of the room had carpet which came off easy but about 130 sq ft had ceramic tile that left a lot of thinset ...
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65 views

Can I use a 4x4 concrete post holder to install a gate?

I would like to install a 10' gate across my driveway to keep my 16 month old from running his tiny butt into traffic. The gate I intend to purchase is this one, with some PVC lattice to prevent climb-...
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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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Removing or leveling an old iron pipe embedded in concrete patio

I have an old concrete patio in the back of my house. This patio has until recently been covered by a small deck, but for several reasons I've decided to replace the deck with synthetic outdoor ...
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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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28 views

Screws for mounting exercise rings on concrete ceiling

I want to have a pair of still rings for training purposes in my room. To be more specific I want a pair of adjustable and storable still rings and for that, I need two screws in my concrete ceiling. ...
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59 views

What type of substrate should I use to install pavers over an existing poured slab patio

I'm going to be putting pavers over an old slab patio. The current patio has settled and spalled, so I'm looking to pitch the paver patio in such a way that it drains as the original slabs did. In ...
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What's the best way to waterproof a concrete structure for a tropical climate?

I am constructing a building from reinforced concrete and AAC blocks in Indonesia. The building will have a flat (2% sloping) roof of reinforced concrete. This will be exposed to tropical rain, as ...
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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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73 views

How can I repair and level the settled edges of a basement slab?

What would be the correct way to level a basement floor that is this much uneven, so that I could build a sublfoor consisting of delta-fl and plywood ? Thank you for any help !
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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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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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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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What kind of paint and texture is this? And how do you patch this area?

What kind of paint and texture is this? And how do you patch this area?
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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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Removing the concrete from the top off a concrete column

I have a number of 12" square concrete piers reinforced with 10 * 16mm rebars. The rebar extends to around 4m tall, while the concrete has been poured to a height of 3.3 metres. This an error because ...
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44 views

How to deal with soil erosion under slab floor of garage?

There is a small crack extending 10 feet down the center of the slab floor of my garage. The floor sounds hollow when I hit it with a 2x4. Also, there is a 4" water drain and I can feel air when I ...
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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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What Cement Based Product Is Used for Smoothly Finished Floors?

I recently replaced a floor drain in my basement around which I had dug out the concrete, gravel and clay soil. When I sealed it back in, I laid down a bed of gravel and sand, and then used a ...
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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 ...