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What Type Of Gravel Under Concrete Slab - Walesfootprint ...

What Type Of Gravel Under Concrete Slab. Fill a 3 inch gap under my concrete subgrade and subbase for concrete slabs concrete slab floor and how to make one difference between crushed stone and gravel concrete for a 15 foot square slab concrete for a 15 foot square slab. How To Build Patios Walkways. Subgrades Subbases For Concrete Slabs The ...

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What size gravel to use under concrete pad DIY Home ...

2011-05-09  Yes to your questions on rebar and placement of it. Since posting I've chatted with an engineer friend who said 4" concrete is plenty. He also suggested 1" sand, then 4" of 3/4" gravel (compacted) then the 4" concrete. Am going to try that!

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What size crushed stone for concrete slab?

2020-06-22  The usual range employed is between 9.5mm and 37.5mm in diameter. - Fine aggregates are usually sand or crushed stone that are less than 9.55mm in diameter. Typically the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete.

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Determining What Size Crushed Stone You Need For Your Project

5/8” – This is also commonly used to mix with asphalt or concrete. It is also used for drainage or as driveway gravel. 3/4” – There are two options at this size – clean and DGA. 3/4” clean is used for drainage behind walls and is also used as fill and for drainage projects, such as French drains.

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gravel under concrete slab? is it absolutely required ...

2017-05-02  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,

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Do you need gravel under a concrete slab?

How much gravel is needed under a concrete slab? Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete. Why do you put sand under concrete? One reason it is used as a backfill or sub-grade material. As with all material, it has to be placed correctly and compacted properly. Sand needs ...

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What is the best base for concrete slab? - True DIY

2021-04-17  How many inches of gravel do you need for a concrete slab? Construct the form with 2×4 or 2×6 lumber and secure in place by wood stakes and deck screws. Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4

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Do You Need Gravel Under Concrete Patio, Slab, Footings?

Yes, you should put a vapor barrier under concrete slabs to prevent moisture from wicking up into the slab and onto the surface of your concrete slab, patio, or driveway.Ensure the vapor barrier is above both the gravel and rigid foam and immediately below the slab. Moisture wicking up into a slab can cause unsightly wet spots on top of your slab, and the efflorescence can be hard to remove.

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What kind of stone under concrete slab? DIY Home ...

2011-04-16  Concrete Masonry. Joined Nov 13, 2008. . 3,881 Posts. #4 Apr 16, 2011. What you want is what we would refer to here as gravel, a mix of gradients of aggregate, from 1" stones down to fine material such as non-washed sand. A few viable options depending on what's it's called in your area: "3/4" road gravel, recycled/ground concrete, 3/4 ...

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Question: What Size Gravel For Concrete Slab? - Haener Block

Excavate the soil to a depth of 8 inches, allowing 4 inches for the gravel base and 4 inches for the concrete slab. What size crushed stone for concrete slab? Question: What size aggregate should be used to make the concrete for a 4 inch slab? Top Answer (37% of 40 votes): 3/4 inch crushed stone. Explanation: #57 rock (3/4) is best for strength.

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what size gravel is used under a concrete slab

2020-10-31  Determining What Size Crushed Stone You Need For Your Project. 5/8” This is also commonly used to mix with asphalt or concrete. It is also used for drainage or as driveway gravel. 3/4” There are two options at this size clean and DGA. 3/4” clean is used for drainage behind walls and is also used as fill and for drainage projects, such as French drains.

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Do you need gravel under a concrete slab?

How much gravel is needed under a concrete slab? Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete. Why do you put sand under concrete? One reason it is used as a backfill or sub-grade material. As with all material, it has to be placed correctly and compacted properly. Sand needs ...

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Gravel under Concrete Slab Pilots of America

2016-06-28  Gravel under Concrete Slab. Discussion in 'Hangar Talk' started by coloradobluesky, Jun 23, 2016. coloradobluesky En-Route Gone West. Joined: Mar 19, 2014 Messages: 3,621 Location: Colorado. Display name: coloradobluesky. For the Civil Engineers out there. Does anyone know of any real reason to spend the money to put gravel under a concrete slab? I have always just graded the dirt under

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What kind of stone under concrete slab? DIY Home ...

2011-04-16  Concrete Masonry. Joined Nov 13, 2008. . 3,881 Posts. #4 Apr 16, 2011. What you want is what we would refer to here as gravel, a mix of gradients of aggregate, from 1" stones down to fine material such as non-washed sand. A few viable options depending on what's it's called in your area: "3/4" road gravel, recycled/ground concrete, 3/4 ...

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what do you use under concrete?

We don't use recycled concrete under any concrete floors we install. We use mostly gravel and sometimes the stone. I would also recommend a vapor barrier of 6 mil poly on top of the stone before you pour the concrete. Click here to post comments. Join in and write your own page! It's easy to do. How? Simply click here to return to Concrete Floor Questions. Facebook Twitter. One more way to ...

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compact fill under slab - Ask the Builder

If un-compacted, or poorly compacted, soil or fill sinks under a slab you end up with a hollow spot. If you drive on this concrete and apply pressure to it, the concrete tries to bend or stretch to conform to the hollow spot. The result is almost always a crack and the concrete slab drops down. I see photos of this unnecessary damage all the time.

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Crush and Run Instead of Gravel Under Slab ...

2020-09-17  Malcolm, I had assumed 4" was sufficient. If it needs 6", I will comply, but at $675 per 22ton load, it hurts. :) Also, when you say - [top dress the 6" below the slab with a drainable fill] - you are talking about the 3/4" gravel between the ground and the concrete, or in my case between the ground and Fomular 250 25 psi foam and then concrete.

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Subgrades and Subbases for Slabs Concrete Construction ...

2017-11-22  A vapor retarder on top of the subbase and directly in contact with the concrete serves to both prevent moisture movement into the slab and as a slip sheet to allow the concrete to shrink without cracking. Use a vapor retarder that’s a minimum of 10 mils thick—15 mils is better moisture protection and also less likely to be punctured during construction.Some designers will specify a loose ...

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Pea gravel or crushed rock? - DoItYourself Community ...

2005-05-07  The concrete doesn't need to adhere to the stone base, there is no advantage to that. If your going to use pea gravel, in my opinion, your wasting time and money. It simply doesn't compact as someone else mentioned. If you think you need stone, do the right thing and rent a compactor, put in the 5 or so inches of 1/2- 5/8ths crushed, and then set your forms. Compact the whole thing at least ...

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Question: What Size Gravel For Concrete Slab? - Haener Block

Excavate the soil to a depth of 8 inches, allowing 4 inches for the gravel base and 4 inches for the concrete slab. What size crushed stone for concrete slab? Question: What size aggregate should be used to make the concrete for a 4 inch slab? Top Answer (37% of 40 votes): 3/4 inch crushed stone. Explanation: #57 rock (3/4) is best for strength.

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Question: What Size Crushed Stone For Concrete Slab ...

What size stone is used in concrete? Crushed stone #8 includes stone between 3/8” and ½”. This is the most common stone used for concrete mixes.. Should you put plastic under concrete? Recently, though, research has shown that the old traditional layer of 6-mil Visqueen (polyethylene plastic) underplastic) under

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what size gravel is used under a concrete slab

2020-09-27  Determining What Size Crushed Stone You Need For Your Project. 5/8” This is also commonly used to mix with asphalt or concrete. It is also used for drainage or as driveway gravel. 3/4” There are two options at this size clean and DGA. 3/4” clean is used for drainage behind walls and is also used as fill and for drainage projects, such as French drains.

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What size aggregate should be used to make the concrete ...

In order to minimize cracking, it is ideal to use a mix design containing aggregates ranging from natural sand, to 1-1/4" at an average of 18-22% of each size by weight. Maven Group LLC. Answer: 3/4 inch crushed stone. Explanation: the standard mix for concrete foundations in 3500# - 3/4" aggregate. This means that the concrete wiil yeild 3500 ...

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Gravel Stone Size For Concrete Slab

Gravel Stone Size For Concrete Slab Opencoffeegouda. Gravel stone size for concrete slab.Popular searches.Compacting gravel under a slab.Dec 07, 2004 re compacting gravel under a slab dick siebert the reason that a graded granular material compacts better than a uniform material such as stone is that with a graded material the different sized particles interlock with each other so if you.

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Importance of Gravel and Sand for Concrete Hunker

The Importance of Gravel and Sand in Concrete. Sand and gravel in concrete serve several purposes. Because they act as a filler, they also add more volume to the concrete. More volume means less air and a stronger product. The size of the gravel also helps to determine the concrete's strength. Though larger pieces of gravel produce more ...

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Crush and Run Instead of Gravel Under Slab ...

2020-09-17  Malcolm, I had assumed 4" was sufficient. If it needs 6", I will comply, but at $675 per 22ton load, it hurts. :) Also, when you say - [top dress the 6" below the slab with a drainable fill] - you are talking about the 3/4" gravel between the ground and the concrete, or in my case between the ground and Fomular 250 25 psi foam and then concrete.

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Pea gravel or crushed rock? - DoItYourself Community ...

2005-05-07  The concrete doesn't need to adhere to the stone base, there is no advantage to that. If your going to use pea gravel, in my opinion, your wasting time and money. It simply doesn't compact as someone else mentioned. If you think you need stone, do the right thing and rent a compactor, put in the 5 or so inches of 1/2- 5/8ths crushed, and then set your forms. Compact the whole thing at least ...

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Proper Subgrade Prep Concrete Construction Magazine

2007-09-20  “Granular material placed under the slab can be open graded, which some believe is self-compacting. Sand and other material should be compacted,” says Chris Tull, owner of Concrete Consulting LLC, Fishers, Ind. Whether it is a foundation, sidewalk, driveway, or patio, native soil or granular material cannot be simply placed in the fill area and then covered with concrete. It is critical ...

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Should You Put Rigid Insulation Under Concrete Slab?

Depending on where you live, rigid insulation under a concrete slab might be required! The IECC, a regulatory code that ensures new construction is environmentally conscious, requires a minimum of R-10 insulation in Climate Zones 4-8. You can check if you live in one of these zones on the IECC zone map.. If the IECC requires rigid insulation under concrete slab, you’ll also need to get an ...

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