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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27k views

Will concrete poured over wet ground be more likely to crack and disintegrate?

What if you’ve had lots of rain & humidity. Our area is slightly sloped. The ground is clay, rocks & some sand. I’m concerned about having concrete poured on a wet ground. We need to have the ...
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Concrete slab for a hot tub

I want to lay a 9 x 9 concrete slab for 125 psi hot tub how thick do I have to make it? And what kind of base should I use?
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Can I cut out a 12" section of a footing to run new plumbing in a basement?

I am finishing my basement and need to run plumbing to the planned bathroom. To do so, I need to cut out a 12" section of a footing (can't go under it). The section in question is under a door ...
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Driveway expansion joints are rotting wood: What to replace the wood?

My driveway was poured in sections with lengths of 2x4 which remained between the slabs as expansion joints. Due to heaving and moisture many of these are in poor shape. I replaced one once by ...
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Removal of leftover glue from glued down 3/4 T&G flooring

In the process of removing the 3 different types of flooring in the house we just bought and before we move in get the major things out of the way. Carpet is easy enough for the most part, the house ...
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How to improve cooling in a room/Cool a concrete wall?

Im on a 2nd floor room, it has big front windows and a small one on the side, I am using my computer/full setup on the corner of the room, where beside me is the window wall, but since im in the ...
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73 views

Alternatives to bituminous membranes for concrete roof?

This new question is related to this old question I had previously asked, but from another point-of-view. I have a 13ft x 13ft rooftop made from plain concrete. It's leaking a bit, so I have to do ...
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3answers
115 views

How can I move this water supply line so that I can frame a wall?

Our main supply line enters through the basement floor. I need to move it about 2-3 inches out of the way because it's blocking a corner of the bathroom I'm framing in. Supply line is PEX with ...
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Should I let my contractor drill and set rebar dowels in my concrete storm shelter to secure a concrete patio that will be poured around it?

I want to pour a 16 x 22 patio from my house foundation (slab) and encasing 3/4 sides of the storm shelter. The contractor states he will drill and place rebar dowel every 2 feet into the foundation ...
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Does a carport slab need expansion joints at interior piers or the perimeter?

I'm planning to pour a pad into an existing open carport / garage area that has mid-span supports resting on poured piers and a foundation wall going around the outside. I'm planning on digging down ...
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221 views

Advice on building a livable cabin floor on a concrete slab with insulation and plywood

I'm planning to build a 10 x 12 living space based on a shed design. The shed will rest on an existing concrete slab therefore my plan is to lay 6 mil polyethethylene sheeting and foam board ...
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How to repair a built in hole in concrete front steps

We just bought a house in Minnesota. The front steps are concrete I believe and they are built with what seems to be small glass block windows or tiles in the top that leads into the basement, letting ...
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When setting fence posts, does the post need to go to bottom of the concrete?

FYI, Previous answers were 50/50 (going back 10y). WHEN SETTING A POST IN A ROUND CONCRETE FORM: ..1.. Some answers said the post must touch gravel at the bottom for drainage, ..2.. the other 50% said ...
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Tree root coming through concrete under shed

A tree root has broken through in the corner of my girlfriend's shed slab. It's under a wooden shelving unit from IKEA and one slat if the shelf has been pried loose by the root. What can I do about ...
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How to seal concrete panel garage

I have a garage made from cast concrete panels. The gaps between the panels and at the bottom have clearly had an attempt at waterproofing in the past but it has failed, so now I get standing water ...
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How can I visually conceal a crack in my concrete driveway?

There is a crack on the sidewalk and front of my garage. I want to repair or cover the crack so that everything looks even and uniform. Any ideas on how to approach this problem? Thanks in advance.
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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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1answer
992 views

Need help installing the pull up bar i just bought

I am a rookie that hasn't done much installing/drilling etc. in my life (I just turned 18 ;P). I bought this pull up bar online, assembled it, but now I have to install it on my wall. At first I ...
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Mixing Exposed Aggregate and Stamped Concrete - One Pour or Two?

I'm doing research for a project I'm asking for bids on and I'm wondering how much you can mix decorative concrete treatments. I want a large exposed aggregate patio, but in order to break up this ...
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188 views

Approaches to level a concrete floor with shallow pipes

I have a situation very similar to How to level a section of raised concrete floor?. Except, in my case the obvious solution of grinding the high point is not possible. In my hallway I have a raised ...
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1answer
88 views

Can this failing concrete patio be resurfaced and how?

Parts of my concrete patio are eroding from around the gravel on the surface. I think it was built in the 70s or 80s. Some parts of the patio are in great condition, others are very bad. Shown ...
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1answer
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How to prepare a rough concrete slab for pavers

I tore my old wood deck out and am planning to lay pavers on top of the concrete slab that was beneath it. I'm following the instructions here, photo below: The inner paver bricks will have a layer ...
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1answer
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How can I stop the dripping from a concrete ceiling?

My uncle built a concrete bunker in the side of a hill over 50 years ago. The shelter seemed to be free of any leaks until just recently in which there is a steady drip in a few spots in the ceiling. ...
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Do I need to remove all carpet adhesive residue before using a floor leveler?

We have a slab foundation on our place. The previous owners put down carpet with pad and there's a fair amount of glue and pad residue on the concrete, as well as some paint overspray. We'll need to ...
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How should I drain an area of gravel between a sidewalk and retaining wall?

We are reclaiming a flower bed and extending our existing patio. After a gully washer I am now concerned about drainage for this 5ft by 36ft impervious surface we are adding. We are also adding a ...
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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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1answer
205 views

Does a masonry hearth need a moisture barrier between it and the plywood subfloor?

I intend to place a hearth on to the plywood floor of my mobile home. Just a basic question really. Do I need a plastic barrier between the plywood and the concrete? My worry is that it may condensate ...
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1answer
57 views

Correct transition for pvc conduit to liquid tight flexible conduit on a concrete slab

I am installing conduit for a hot tub. I have conduit coming up from underground at the edge of the slab and I wondering how to transition it to liquid tight flexible conduit on top of the slab. The ...
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1answer
2k views

Wood posts: install on concrete slab OR dig hole and bury them?

I am putting a shade sail up over a concrete slab that buts up against the back of the house. I am going to attach the sail cloth to the house (brick), and then put up 2 posts for the anchor points ...
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Does a small concrete slab need control joints?

I’m pouring a small slab for some pool equipment. It will be 4’x8’x3.5”. I expect little to no foot traffic, just a heater, pump, and chlorinator. (Mabye foot traffic just when adding tablets) Do I ...
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668 views

How to increase part of existing internal concrete slab by 300mm

I have a property with a 150mm (6") thick concrete slab throughout. The slab has a step down of approx 300mm / 1 ft, running the width of the house. This means the front rooms are at a higher ...
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139 views

Should concrete footers be separated from a concrete slab?

I am going to build a pavilion over a concrete slab and I am wondering what would be the best way to set up the footings. I was planning on using steel column bases set in 12 inch sonotubes. There ...
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Patching a hole in wall for reuse

I was trying to hang an IKEA Kallax shelf on the wall but ended up tearing away part of the wall. I am not too sure what kind of wall this is (in a ~1960s apartment building), first layer looks like ...
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1answer
315 views

Does my bathroom addition require breaking the concrete?

I'm planning on calling a plumber to give me an estimate on my bathroom addition. There is no basement, it is on the first floor on a concrete slab. I already have a bathroom on the 2-nd floor right ...
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1answer
44 views

The best way to fix a deteriorating foundation?

I've got a corner of my foundation that is crumbling. I tried concrete vinyl patching but it only lasted few years and got worse. Here is what I used before: I am not sure what else to use, other ...
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1answer
95 views

Gravel inside concrete form or form on top of gravel?

I am pouring a 5 inch concrete pad for a hot tub. I am planning on putting down 4 inches of compacted gravel under the concrete with rebar mesh in the center. My concrete pad will be 9 feet by 9 ...
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43 views

What material should go between old and new concrete?

I recently poured a slab for a hot tub and I want to pour additional concrete around it for a walkway. I want to keep the new concrete separated from the hot tub slab in case they heave at different ...
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2answers
274 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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Longevity Stamped Concrete vs. Normal Concrete?

I have a backyard and have a planned 950 sq. ft. patio to be poured. In the past, I've had normal broom swept concrete for a patio and this time I'm thinking of going to a stamped concrete with ...
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Why can't I drive this Tapcon into concrete?

I'm trying to drive a 2 1/2" long 3/16" diameter Tapcon into a 50 year-old concrete slab/subfloor to attach a new toilet flange. The instructions on the case of Tapcons said to drill a hole ...
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34k views

How big a hole do I have to drill in concrete to embed rebar in it?

I have a concrete patio that I'd like to use as the foundation for a CMU wall. I'd like the CMUs to be tied into the patio slab with rebar. I get that the gist is to drill a hole in the slab, put ...
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How can I decommission a copper pipe through a concrete wall?

A previous owner of my house installed a 1/2" copper tube gas line through the basement wall beneath ground level to install a grill, which an owner after him removed, leaving the line buried. I ...
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When pouring concrete, is it safe to add large rocks to increase volume?

Backround I'm going to pour some concrete to anchor a swing set. The base of the swing set that is being anchored is two 4x4s with a 2x4 footer crossed perpendicularly to the 4x4s. I have a bunch of ...
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setting post in quikrete in a plastic planter

I would like to set a 4x4 post (10 ft) in a tall, heavy plastic planter. I am using 2 50 lb bags of Quikrete. It says to just pour the concrete in, set the post, and then pour about a gallon of water ...
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anchoring a beam made from dimensional lumber to concrete piers

The rim joists of a shed will sit on two horizontal beams. The beams need to be secured to concrete piers with some kind of galvanized tie. Something like the one in the picture. The beams will be ...
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1answer
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Will this arrangement of bricks be a good base for a concrete floor for a garden shed?

I am building a 6ft x 4ft garden shed which will have a concrete base. I've levelled some ground, built a frame, and made a floor out of old bricks. The ground is fairly clay-heavy. I've been ...
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464 views

Avoid rust where railing anchors into concrete

If you have seen railings anchored into concrete, you may have noticed how they tend to rust at the junction between the railing, the concrete and the air. Here is a photo of a pretty typical example: ...
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How clean does the surface of new-poured concrete footings need to be before pouring piers?

I'm moving a 8x16 shed-turned-shop onto nine 10" piers on 16" footings over a clay substrate. I'm doing a split pour. I have already dug the holes, poured the footings and set the vertical ...
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How to fix out of level foundation walls

I am building a detached two car garage and just had the footings, foundation walls, and slab/apron poured. After the walls were poured, I thought that everything was hunky dory as the contractor ...
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Will old anchor holes in a concrete slab reduce its useful life?

An impaired driver jumped my curb and ripped my square mail post out of the sidewalk concrete that it was anchored into. The bolts were all ripped out of the concrete. Bolts went through the metal ...

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