DIY Builds
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Can you pour concrete without gravel under it?

Is gravel absolutely required NO but it is a good idea. Most the time i see slabs poured directly on earth the owners are doing it themselves and the base is not level or has holes. If a slab is not a uniform thickness this can cause cracks even with reinforcement of fiberglass, mesh or rebar. Save this answer.

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so, I have a post-frame shed, 12x16. there are posts at 6' on the short sides and every 4' on the long side. posts are set ~18" below grade, on a 2" cap of cement over a few inches of well compacted gravel, holes were all about 27" or so, 2x6 girder runs level at the top (very level all the way around) around base, ok, so, basically I have ~5.5" to grade from bottom of 2x6 girder to top of board, and the Ive got posts set in concrete, at 24" from the top of that board so I want to fill that in with concrete, I could put gravel in, say 2" and 3.5" of concrete over that. Its about 3.75 cu yards of crete, or like $400 It will cost $100 for gravel to fill in 2", but my crete is still only a little cheaper, and it will be a thinner slab. I could put gravel in, say 2" and 3.5" of concrete over that or just full 5.5" of crete or I could do lot of gravel and a 2" top coat over that with a bunch of steel and fibers, Its just a shed, so Im not too worried about it, I'll put steel mesh in and probably fiberglass to control cracks and run a groover down the center. Point is, can I get away without using gravel and just lay plastic down and pour a slab, or is the clay soil going to destroy it if I dont have a couple inches of gravel. I am not, going to dig this down deeper, or pour higher that the girder. Its 5.5" of space, with a few low spots I can rake out. It much faster to do a one day pour so I can put my books back in and my tools to keep them dry, so full 5.5" concrete is good and fast, but a couple inches of gravel would be nice, but is a total extra set of work for little gain thoughts? (yes, I should have done this in a different order, it was not an option at the time)

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Do you need to compact gravel under pavers?

Make sure you compact the gravel in 2-inch layers. If you don't, the top will be hard but the surface beneath it will be soft. Since no concrete is involved, you can start one day and finish another.

Even beginning do-it-yourselfers can master laying pavers without mastering the techniques of mixing and spreading concrete. The pavers lie on a 5 1/2 -inch bed of sand and gravel. The bottom 4 inches is gravel to provide drainage. The top 1 1/2 inches is bedding sand that helps hold the pavers in place once they're compacted into it. Finer sand, sprinkled between the pavers, keeps them from shifting. Edging around the outside of the outside of the patio holds the pavers in place. When you lay out the patio, slope it away from the house at a rate of 1/8 to 1/4 inch per foot to keep water from working its way into the house. Make sure you compact the gravel in 2-inch layers. If you don't, the top will be hard but the surface beneath it will be soft. Since no concrete is involved, you can start one day and finish another. Most pavers even simplify getting the proper spacing between blocks because tabs on the sides keep them the proper distance apart.

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