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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379 views

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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34 views

I have an old porous “fruit cellar” of stone/concrete mix crumbling apart. How can I close it off and fill it in? Same with an old leaky cistern

Our house is almost 100 and has a fruit cellar crumbling below our front porch. We had it repaired 3 times but given it is made of a stone/concrete mix the foundation repairs continue to crumble & ...
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0answers
229 views

Extend/splice 12/2 romex along concrete finished wall

I would like to extend some wiring for a counter outlet that is running behind a refrigerator, which currently encased in a metal "cable concealer" raceway. Note: wiring is in a raceway because most ...
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0answers
47 views

Iron bar set in concrete heavily corroded; how to mitigate?

I have a decorative concrete column (solid concrete with rebar) in front of a multi-storey house, about 10m hight. Said column is held by three thick steel bars (6 x 2 cm) that link it to the house, ...
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1answer
435 views

Repair driveway expansion joint sealant during winter?

We moved into a new construction home this part March. At our first warranty walkthrough, our builder told us that because we were a north facing home, we would have to seal our expansion joint where ...
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0answers
9k views

How long can a concrete pool stay empty when ground water is not a problem?

I live in Las Vegas, you know- the desert. Ground water is not a problem here, when it does rain, it either evaporates incredibly fast or is absorbed very deep very quickly. I also live on a small ...
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0answers
4k 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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0answers
1k 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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0answers
644 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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0answers
47 views

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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0answers
56 views

Should the high side of a concrete block retaining wall be sealed?

I am mid-project in a DIY yard project. I have subbed out a large retaining wall to a civil / wall contractor. It’s 220 feet long, between 2-5′ in height, and makes 2 90-degree turns. It’s built to ...
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0answers
23 views

Spanning a Gap Between House and Garage with Chain Link

I bought this house a few years ago and the previous owner decided that this embarrassment was the best addition for this garage. Needless to say, it's horrendous and I want to take it off. (and the ...
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1answer
59 views

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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0answers
28 views

Uncoupling membrane on new concrete

Tiling my basement floor, but had a big heave in it from tree roots (tree now gone). I cut out all around the heave, removed old concrete, rebar’ed and jointed into old concrete and poured a new slab. ...
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0answers
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Hard Bond vs Soft Bond Diamond Grinders

I picked up a set of MOHS test picks. They are handy to determine the hardness or softness of concrete. Despite having ground a few slabs in my day I just learned that there are soft bond and hard ...
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0answers
168 views

What are the differences between trowels for concrete and plaster? Are they interchangeable?

I have some paving steps to lay in concrete, and will buy a trowel for smoothing them off. There's an enormous range of trowels/floats available, with almost identical ones for plastering and for ...
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1answer
106 views

Paver Patio with Backfill Settlement Around Block Foundation

Main Question: I've been told that a concrete skirt (8" sloped pad) below the frost line and attached to the foundation via rebar is a good solution for putting pavers next to a block wall ...
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0answers
72 views

Filling expansion joints before self-leveling concrete?

I am adding self-leveling concrete to my basement flooring. I have expansion joints which are currently filled with a joint compound. How would I fill in the expansion joints so that I can cover the ...
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3answers
38 views

Flooring Subfloor Condition How smooth it has to be

Just tore out 800 sf of ceramic tile for installation of laminate flooring. I've spent 2 days on a hammer drill trying to wear down the 30 year old thinset, but there are still quite a few spots ...
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93 views

Strange concrete pad ringed with bricks in basement

I'm developing a Victorian flat (UK) the moment and there's a room that I wanted to clear out but there appears to be a load-bearing support beam with a concrete support pad at the base...I'm ...
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0answers
26 views

What is the minimum thickness of concrete above hydronic heating pex

I am doing a diy hydronic heating system in a house I bought in the mountains. For the main part of the house I am using 3/4" x 9" strips of plywood with spacing for the tracks of the 1/2&...
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0answers
710 views

How to level a sloping concrete slab with a 2” difference?

I know this sounds bad and I need to give some backstory to not sound off the alarms... I’m going to give the main question first and then backstory below so you know I’m not crazy. Question: We have ...
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39 views

Running power to a sub panel for a shed

So a friend of mine wants power to his shed for a tv, a small portable ac unit and some lights. I told him a 60 amp sub panel would be best just in case of expansion. So the issue is that from the ...
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0answers
31 views

concrete blocks

can you use the large interlocking concrete blocks(1600mmx800mmx800mm) to build a house? Would you use extra cement or would you it be safe and strong with the right structure to withstand hurricanes? ...
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0answers
15 views

How long do I need to wait to paint after I skim coated a chimney with concrete?

I needed to skim coat an interior chimney with a very light coat of concrete. How long until I can paint it with masonary paint?
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0answers
27 views

Sealing/resurfacing exterior concrete retaining wall

I have a 3 ft concrete retaining wall that runs across our backyard. It collects a lot of black mildew with white spots. Is there a sealant or other surfacing material that I can use to help keep ...
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0answers
92 views

How to flatten (not level) a concrete slab by shimming a subfloor

I will be working remotely permanently and have a another baby on the way so my current home office is going to be a nursery. I would like to convert a section of my garage into an office, but keep ...
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1answer
644 views

How to build an additional concrete/cinder block wall in basement, where the crawl space and basement meet

The small basement in my house (built in 1932) has three concrete walls. The forth wall is comprised of vertical wood boards. Behind the boards is the crawl space for the rest of the house. The ...
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1answer
81 views

How do I tell if dried flooring glue is oil-based or water-based?

I removed vinyl flooring that was glued down (by a previous owner) in the 1990's, and there is a significant amount of dried glue left behind on the concrete floor. The self-leveler and glue that I ...
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0answers
32 views

Raising Concrete Floor then install Vinyl Plank Flooring On Top

In order to be level with hall, I need to raise the height of the floor by 1/2"-1" in a room in which I am going to be installing vinyl plank flooring. Previously the room was carpeted so with the ...
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2answers
71 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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0answers
63 views

Can I tile over white paint?

Through out the house there is this white substance on the concrete that looks similar to white paint. There use to be carpet with the first owner of the house hence the brown glue, and then there was ...
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0answers
44 views

Waterproofing concrete from the ground?

We want to build a table with benches outside. For this, we have a concrete base with vertical rebars (40cm out of the ground). We want to build brick columns for the structure of the table/bench (...
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0answers
119 views

Repointing stone basement

I am looking into which cement to use to repoint our old house (built ~1900) stone basement. I found conflicting advice, some suggesting type N or type S is fine, but some sources suggest that ...
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0answers
44 views

Reducing moisture from semi-finished basement concrete floor

I'm looking for advice for a good way to reduce moisture seepage through my basement concrete floor. My research has turned up several promising approaches: Surface-only treatments Specialty paints ...
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0answers
79 views

How long will a concrete bore plug take to cure?

I have sealed an old abandon deep boring which was 220 feet long. First I poured small stone chips up to 7 feet and poured liquid cement mixed with Dr fixit up to 220 feet. My boring had PVC cashing ...
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0answers
98 views

Sealing leaking cracks in concrete lanai roof that is also an upstairs balcony

First, I want to apologize for the length of this. I like to think I'm a reasonably competent DIYer but this one may be out of my wheelhouse. (and I'm not even sure what type of contractor I'd call ...
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0answers
80 views

Can faded stamped concrete be stained to match rest of patio?

Stamped concrete patio has severely faded - assume from sun and water runoff from canopy? Rest of patio and back steps looks great.It has been sealed several times over the years. How do we restore ...
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1answer
628 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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0answers
46 views

Level a concrete pour 11' x 14'

How best to level a concrete pour enough to finish with engineered floor planks. The new pour adjoins an existing pour on two sides and is 1/2" to 1 1/2" out of level in places. The highest ...
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2answers
176 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
113 views

How can I remove paint splatters from sealed decorative concrete deck?

I have a custom concrete pation & pool deck that is textured / painted to look like wood. It is also sealed. Recently I had the coping on my pool fixed and the guy did a great job but left quite a ...
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0answers
280 views

Minimum Concrete Thickness Over PVC After Rough-In

I just has some plumbing roughed in for my basement. The plumber did an okay job but for some reason routed the drain pipe for the sink under the area where my shower will go. This would't normally be ...
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0answers
34 views

Render internal wall after doorway brickup

As per the picture, I have a room with a bricked up wall. All the walls are concrete. The doorway has been bricked and covered with what I believe to be cement. So far I have sanded the doorway with ...
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0answers
87 views

Water puddle in backyard causing leaking in garage concrete wall

This is what I saw in the backyard of a split level home after a light rain The water was there due to overflow from gutter. I can clean the gutter but the puddle situation must be fixed as it will ...
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0answers
178 views

160mm pvc pipe running through a deep concrete pour - will it crush?

I have am unusual situation. I had to use 160mm pvc pipe to create a wide duct for services connections that must pass about 500-660mm deep through a new footing that's about to be poured. The pipe is ...
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0answers
42 views

Inground trashcan missing neck

I have two in ground trash cans that are missing the neck where the hinge attaches to the lid. When it rains, water gets in and fills the hole. I have a 32 gallon plastic trash can that I put in and ...
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0answers
900 views

Water/ moisture coming through patched concrete hole in basement floor

We had our walls braced last summer and the basement guys had to drill holes in the floor to push the walls back in to place. They patched up the holes with concrete and I've noticed a few times (...
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0answers
108 views

Re-Painting Concrete porch

Hi I have a concrete porch with peeling and cracking paint. Do I need to sand it and then power-wash it before repainting. I tried using an orbital sander with 60 grit sandpaper but it just kept ...
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0answers
232 views

Drilling Under Concrete Slab

My church is trying to figure out how to move their soundboard to a different spot in the sanctuary. All the existing wiring for the soundboard (mics, speaker wire, power controls, etc) come in ...

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