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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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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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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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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21 views

Concrete pour against green board [on hold]

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 ...
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What is the proper way to prevent water infiltration between exterior stairs and wall

My house has a full flight of poured concrete stairs (covered with decorative stone) that runs parallel to (and butts up against) an exterior wall. The interior wall had water stains at the basebord,...
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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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38 views

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 stop outside rainwater from coming in under the wall and through the concrete floor of my garage conversion?

I have got a problem with an attached garage converted den in a 1978 built brick home. The heavy spring rains are redirected to the two year old perforated drain system on the side of the house ...
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28 views

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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111 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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Pouring a concrete slab against my house: how to frame it up against the outside wall?

I have a concrete front stoop that drains some water into the basement, so I am going to knock it out and pour a new slab with better grading. The slab will be about 4 feet square, and fits into a ...
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49 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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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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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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122 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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Should I set wooden porch pillars into, or on to concrete footings?

I'm building a wooden porch on the front of my house. I have six 4" wooden pillars supporting the structure. It's light, doesn't contain concrete, roof tiles, etc, and is made entirely of wood. I'm ...
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How long can I store a bag of Quikrete?

I had planned to find a nook in the low-humidity house in which to shove it, but it would be interesting to know how long the bag will keep in various humidities. The main question is: How long can I ...
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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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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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66 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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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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Can I build a deck this low to the ground?

I want to build a deck off the back of my house. The door is near grade level, about 1' above. The grade doesn't have very large slope, so that means that the beam at the far end would be below grade: ...
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How can I find places to nail/screw into walls of ICF (insulated concrete form) home?

The home I bought has exterior walls made of ICF (insulated concrete form). I don't know the brand or type, I just know that somehow the builders attached the drywall to the styrofoam/concrete. I'm ...
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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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23 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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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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Soil under slab (sidewalk) washed away and is now causing cracks down the middle

I have a 50' x 6' concrete slab in front of our basement that supports the same size wooden deck above with 6 post for the upstairs. The soil under it washed away due to poor drainage. I have fixed ...
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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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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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37 views

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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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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Ground preparation for deck pier block

I am planning to extend my deck, which uses pier blocks as below photo I cannot tell what's underneath this pier block because it was just dirt. There was no pour concrete for certain. So my ...
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347 views

How wide does a 6x6 concrete post footing need to be using an elevated post base anchor?

I'm building a pergola over a paver patio. The pergola will dimension 11'x 11.5' on center of post with 6x6 posts (4 posts), tied together with sandwiched 2x12 beams. I've laid out footer locations ...
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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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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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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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Can I mix latex paint into concrete

would like to color concrete mix can I use outdoor latex paint to mix in with the concrete?
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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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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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What can I do about a house with internal concrete floor with no DPM?

My partner and I have just bought our first home.A 1950's bungalow which is need of refurbishment. So far it has thrown us a ton of surprises! The worst so far being the floor in one of the bedrooms. ...
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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 ...