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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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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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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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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Should I use solid concrete or cement block for an egress window well?

I am having some contractors build a window well for an egress window at my house. I have the option of doing solid concrete walls for the window well, or cement blocks (which he said he will fill ...
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28 views

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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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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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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What kind of precautions should I undertake to use epoxy-based paints?

I see on the market floor paints made from "1-part epoxy" or from "2-part epoxy". They are meant for concrete floors. Epoxy is reputed to be very harmful if misused during construction. Anecdotes ...
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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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75 views

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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139 views

Installing long 20ft metal poles in concrete around a football pitch

I work at a football club and I need to install some long 20 ft metal poles into the ground set in concrete. My question is how deep must the holes be and what diameter hole needs digging. The poles ...
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30 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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56 views

Drywall skim coat over painted CMU?

I have a small section of wall (50sf) where the stairwell goes into the basement that is CMU (concrete masonry unit or concrete block) painted with at least an egg shell, possibly even semi-gloss. ...
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133 views

filling in gaps in concrete patio

I have several 2" wide by 6' long spaces between the original patio slab and the newer slab that was poured after original construction of the house. The porch is covered so no moisture is getting ...
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Self-leveling alternatives to gypsum concrete (Gyp-Crete, Pyrofill, Securock) over OSB?

Replacement options for < 1.5 inch pour? Details: Bathroom remodel (new tub, tile wall/floor, toilet, vanity). Old tile floor came up with finger pressure, found that the gypsum concrete ...
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52 views

How should I prepare the site for a concrete step?

just bought a house where we've got an existing concrete slab porch that is 12" above the adjoining sidewalk and it does not have a step. We want to add in a large 6" tall x 3' wide x 11' long slab ...
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108 views

What are the specifics I should be looking for in a quote to replace my concrete steps?

The front steps in front of my house are deteriorating. I am trying to get a contractor to replace the limestone slab steps with concrete. For example, enclosed is a picture of my estimate from 2016. ...
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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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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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69 views

Latex paint over concrete primer

I have put concrete primer on my poured concrete walls in my basement. I have enough of construction latex paint primer to go over it all again. Is it okay to use on top of the concrete primer and ...
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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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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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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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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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66 views

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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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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Best way to make a hole in concrete wall

So my house has concrete walls and ceilings. There a few places i would need to remove some large holes like for vents or light fixtures. I was looking at a concrete hole saw which seems to be a good ...
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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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How long should it take concrete to fully cure?

I have just had a backflow valve installed in the basement. The man had to chip away some of the concrete, he then put new cement down. He also had to do some work outside around the foundation, he ...
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How can I level a part of a concrete floor in preparation for installing a washing machine?

Whoever installed the existing washing machine in the basement was unable to extend one of the legs long enough to adjust for the slope in the concrete floor. So they took a piece of wood and stuck ...
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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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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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173 views

Where to seam concrete countertop?

I'm looking to do a concrete countertop and would like some advice on where to make the seams.I was thinking either where the red or the yellow lines are. Thanks, greg
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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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What is the best way to remove and prevent leaf stains on concrete pavers?

We have a brand new paver stone walkway/patio. To my dismay, I noticed that their were leaf and acorn stains from the oak tree in the front yard. I've learned my lesson and I'm going to try to keep ...
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laying a new bathroom sub-floor on to sand bed

The floor is fully ripped out and sand exposed. New plumbing ( wastes) in place but now to pour the new sub-floor. What do we do now? Approx. 0.5m3 for 100mm thickness.
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35 views

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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Can I build a car-port on the side of my garage?

I have a 2-car attached garage but three cars in the household. While I'm obviously aware I can just leave the third car in the driveway, it inconveniently blocks the cars in the garage and in the ...
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72 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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1k views

How can I hang a framed picture onto a wallpapered concrete wall without damaging the wall surface?

I have a framed picture about two feet by three feet in size that weighs about one pound (not a sheet of paper). I want to hang it onto a wall that is of full-blown hard concrete and covered with ...
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38 views

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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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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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 ...