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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.

5 votes
2 answers
1k views

Concrete sealant vs spraying to cure a concrete slab

Yesterday I poured a 9ft x 9ft x 5 inch slab and I am wondering if spraying the slab with water is better than using cure and seal during the curing process. I have also seen some people build a smal …
Brian Kalski's user avatar
0 votes
0 answers
276 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 rates in the winter. What kind of material would be good to separate them? …
Brian Kalski's user avatar
1 vote
2 answers
114 views

Should a path around a slab be isolated from the slab?

I want to build a concrete path around the existing slab. The new path will be 42 inches wide and wrap all four sides. Should I keep the new concrete isolated from the existing slab? …
Brian Kalski's user avatar
1 vote
1 answer
3k views

Gravel inside concrete form or form on top of gravel?

My concrete pad will be 9 feet by 9 feet. … inside the form and pour the concrete on top? …
Brian Kalski's user avatar
3 votes
1 answer
9k views

Should concrete footers be separated from a concrete slab?

There will also be a concrete slab under the pavilion. I am exploring three options. … The second option would be to bury the sonotubes (4 ft deep) and pour the concrete for the tubes and the slab (4 inch thick) at the same time with no separation. …
Brian Kalski's user avatar
2 votes
2 answers
25k 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 …
Brian Kalski's user avatar
0 votes

What would be the potential pitfalls in pouring a concrete patio over deck footings and then...

I am building something similar. My plan is to first pour the footings (sonotubes) and embed brackets. The top of the tubes will be at the height that I want the final slab height to be. The next s …
Brian Kalski's user avatar