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why do i need crushed stone under concrete

Crushed Stone Under Concrete: Why It's Needed

When working with concrete slabs, it’s important to take the appropriate steps to ensure that it lasts for many years to come. In order to get the most use out of your concrete slabs, you need to add a layer of crushed stone beneath it first.Placing crushed stone under concrete serves several purposes and can provide the following benefits.

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3 Reasons Why It's Important To Use Crushed Stone Under

Apr 28, 2014· Concrete may seem strong, but after many years, elements, and pressure, it will eventually crack. So in order to make your concrete last as long as your money that went into it, adding a layer of crushed stone under a slab of concrete will increase the life of your investment. Here are 3 reasons why a layer of crushed stone is important to the life of your concrete:

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why use crushed stone under concrete AD DIFFUSION

Crushed Stone Under Concrete: Why It's Needed When working with concrete slabs, it’s important to take the appropriate steps to ensure that it lasts for many years to come. In order to get the most use out of your concrete slabs, you need to add a layer of crushed stone beneath it first.Placing crushed stone under concrete serves several

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gravel under concrete slab? is it absolutely required

We can use crushed stone as a capillary break if there are no fines in the crushed stones—but the stones don’t act as a vapor barrier. So it is common to use crushed stones with no fines as a capillary break—and then add a plastic sheet over the top of the stones in contact with the concrete as a

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The Complete Guide to Crushed Stone and Gravel

Nov 11, 2019· Best applications for crushed stone. We have already referenced many places where crushed stone is used, but the most common are construction projects that need concrete, solid bases, or drainage systems. Parts of crushed stone are commonly used as aggregates for ready mix concrete.

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Crushed Stone or Crushed Concrete Modern House Plans by

Jun 30, 2010· That's fine, but you really have to think about where you are using it. If you are talking about the layer of stone you lay below a slab on grade for your home, then I think this is not a good place for crushed concrete. The reason gets back to why that stone is there in the first place. The stone bed below a slab serves several purposes.

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Gravel under concrete footing GreenBuildingAdvisor

Crusher-run gravel compacts well but does not drain very fast -- at least not as fast as 3/4-inch crushed stone (no fines). Talk to a soils engineer if you are worried -- but in my experience, either crusher-run gravel (compacted) or 3/4-inch crushed stone can be used under footings. So can rigid foam. An engineer may disagree.

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shouldn't I have gravel under concrete footers? DIY Home

Sep 29, 2012· Our contractor is telling me that a layer of gravel is not needed under the concrete footers. I called the inspections office in my area and spoke to the lead inspector in my area and he told me the same thing, but couldn't tell me why gravel isn't needed under the poured concrete. I called the inspector for a second opinion.

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Should vapor barrier in slab be under 4 in. of gravel or

2-part question: 1) I'm building a 2-car garage with upstairs apartment in zone 4, 26' x 28'. getting different opinions on whether the vapor barrier -6ml plastic- should be under the 4'' of gravel or on top of the gravel directly under slab? Some are saying it is not good to pour concrete right on plastic, although this seems to be the most common way to do it.

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Do you need to put gravel under a concrete pad? Yahoo

May 12, 2008· I am a concrete worker, and the answer is yes. It helps with the drainage, and also with the settling of the concrete, so the cracks are minimal. You want 4 inches of gravel under 4 inches of concrete . Any less concrete and you will have problems in the near future. Dig down 8 inches in your backyard the size of the pad you are pouring.

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The Complete Guide to Crushed Stone and Gravel

Nov 11, 2019· Best applications for crushed stone. We have already referenced many places where crushed stone is used, but the most common are construction projects that need concrete, solid bases, or drainage systems. Parts of crushed stone are commonly used as aggregates for ready mix concrete.

More

Gravel under concrete footing GreenBuildingAdvisor

Crusher-run gravel compacts well but does not drain very fast -- at least not as fast as 3/4-inch crushed stone (no fines). Talk to a soils engineer if you are worried -- but in my experience, either crusher-run gravel (compacted) or 3/4-inch crushed stone can be used under footings. So can rigid foam. An engineer may disagree.

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Why do I need a Crushing and Screening Plant General

Nov 05, 2019· The Crushing and Screening Plant General Permit allows activity requiring crushed stone and/or the production of concrete under air quality rules. Concrete batch plants can also be operated under this permit to produce concrete. In PM10 (particulate matter 10 micrometers or less in diameter) attainment areas, this general permit allows for 6,500 tons per day for crushing and

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why do i need crushed stone under concrete

Why Put gravel under concrete? Google Groups. 06.05.2010· gravel under the concrete. I want to pour a driveway section in front of the garage and was told by a guy at the concrete company (who came to measure the amount needed), that I need to put gravel under the concrete. WHY?

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should I use stone under my cellar floor

My cellar is dirt. Should I lay stone before I lay the concrete. A. Yes. First determine how much head room you need. You may need to dig out some of the existing sub-base before adding crushed rock. Check the building codes in your area. Once the sub-base is ready and level add two to three inches of 3/4 inch crushed rock over it.

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Why Put gravel under concrete? Google Groups

May 06, 2010· gravel under the concrete. I want to pour a driveway section in front of the garage and was told by a guy at the concrete company (who came to measure the amount needed), that I need to put gravel under the concrete. WHY? I should mention that I always put lots of small to medium sized rocks under concrete to save on the amount of concrete needed.

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How to Pack Down Rock Before Pouring Concrete Home

Dec 09, 2018· How to Pack Down Rock Before Pouring Concrete. Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete

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What kind of stone under concrete slab? DIY Home

Apr 16, 2011· I am getting ready to have a foundation poured for a garage this summer, I am new to foundations so I asked my building inspector what kind of stone I needed under the slab and the only response he would give me was "You figure it out" It would have taken him less effort to list the stone, but thats for another day. Anyways, help is appreciated, I have come across a dozen different

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Does anybody use sand as a base before they pour concrete

Concrete cracks no matter what you do, that is why you see regular spaces groves or lines in sidewalks, its a control joint to allow cracking to occur there rather than where it wants. Otherwise, what is under a slab depends on the ground you are pouring the slab on, some soils don't need anything, some need a

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Should I set fence posts in dirt, gravel, crushed rock, or

why the concrete block under the post? as deep as necessary; then set the post and level it, putting some crushed stone around it to keep it straight; then drill holes on an angle on two 90 degree sides of the post and drive 3 foot long pieces of rebar through the ground, through the holes, and further into the ground on the other side of

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Determining What Size Crushed Stone You Need For Your Project

Crushed stone is used for a wide variety of projects, from building roads to providing suitable drainage and from laying a base for pavers to enhancing the look of landscaping projects. There are so many uses for this versatile material, yet many people are unsure of what size they need when it comes to selecting the proper material for their project.

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What Type Of Gravel Under Concrete Slab Walesfootprint

3 Reasons To Use Crushed Stone Under Concrete Slabs B R Sand. Proper Subgrade Prep Concrete Construction Magazine. Aggregates The Difference Between Crushed Stone And Gravel. View Of A The Concrete Slab Over Vault Edge Beams And B. Gravel Vs Concrete Shed Base Which Is

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How important is gravel under a concrete sidewalk? (Home

Oh and BTW rounded/river gravel is not best a CRUSHED rock product (though same size as gravel typically 1/2" or 3/4" minus for this purpose) is much better does not move around as much under load, though under a sidewalk not anywhere as near important as under a driveway where rounded gravel can cause significant issues.

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How much gravel under concrete? TractorByNet

Nov 26, 2002· Better to do it in two "lifts", compacting between each one. Iv'e never seen sand used as a base for a concrete pour but maybe that's different for different parts of the country. Check out some of the concrete websites lot of good info out there.

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