what do you use under concrete? Everything About 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.

CONCRETE MIXING RATIOS Everything About Concrete

Concrete mixing ratios for cement, sand, aggregate, and water are generally mixed as 1 part cement, 3 parts sand, and 3 parts aggregate or stone with just enough water to make it workable. CONCRETE MIXING RATIOS. ... Will teach you each and every step you need to take to successfully install any size concrete slab.

Crushed Stone vs. Pea Gravel: What’s the Difference ...

Jan 06, 2016· Thankfully, if you’re stuck in the crushed stone vs. pea gravel debate, we’ll clarify it all for you below. What are the size and shape differences? When you compare the two, the biggest differences you’ll notice are the sizes and shapes. Although gravel can come in a variety of sizes, pea gravel …

Stone size gradation chart which stone to choose ...

(X) = Stone consists largely of this size (..) = Stone can consist of up to 15% of this size (.) = Stone can consist of up to 10% of this size * Each Stone gradation can contain up to 10% upper and lower grades and some fine material (sand).

Aggregates for Concrete GreenSpec

A larger size, 40mm, is more common in mass concrete. • Larger aggregate diameters reduce the quantity of cement and water needed. 20 mm aggregate . Common aggregates • Crushed Stone and Manufactured Sand. Stone is quarried, crushed and ground to produce a variety of sizes of aggregate to fit both ‘coarse’ and ‘fine’ specifications ...

Crushed Stone Grades: A Complete Guide

Crushed stone 67 – Sizes from 3/4″ down to fine particles. For fill, road and slab base. Crushed stone 1 – Sizes are from 2″ to 4″. The largest of the crushed stone grades. For larger jobs such a culvert ballast. Crushed stone 8 – Sizes from 3/8″ to 1/2″. For concrete and asphalt mix. Crushed stone 3 Sizes from 1/2″ to 2″.

best size stone for under concrete slab

Stone Gravel texture background Gravel is an easy solution for a shed base, and works well with small to medium sized storage sheds, particularly metal, plastic ... support with other foundations, such as a wooden frame, or concrete slab.

How to lay steppingstones on gravel. Guide on laying ...

For our guide on how to lay steppingstones on gravel we are laying a concrete paving slab called Marshalls Saxon paving. We are using them as steppingstones and they have an overall square size of 450mm x 450mm (18 inches x 18 inches). Watch our video on how to lay steppingstones on gravel

How To Build A Gravel Pad Byler Barns

Nov 24, 2015· Gravel Pad Materials. Gravel. Use gravel (technically called “stone”) that will compact, such as 21A or 21B. There is very little difference, but David Frazier at Frazier Quarry recommends 21A (also known as “1inch crusher run”). This stone has fine material mixed in with it, which fills up the air pockets and allows the stone to compact down so that it becomes dense and will not ...

Choosing Best Gravel For Concrete Pad Concrete Paving ...

Jan 06, 2008· Choosing Best Gravel For Concrete Pad ... for concrete deck or slab prolly should tamp it. Nobody ever does though. If you don''t tamp it at least wait a week or so before you pour. ... does 3/4 mean 3/4" and 57 (or 5/7?) mean 5 to 7 cm stone? I compact it all the same, but doesn''t seem to do a whole lot except aroudn the edges.

gravel stone size for concrete slab

Gravel Mix (Concrete Mix) GRAVEL MIX is a quality blend of Portland cement, graded sand and stone/gravel. ... For a Slab/Pad, enter:

compacting gravel under a slab JLCOnline Forums

Dec 07, 2004· Re: compacting gravel under a slab Thanks for your comment Dick, but hopefully they''ll be no "oozing" of concrete into the gravel under this slab. I''ll have a layer of thick poly ontop of the gravel then a layer of 2 inch rigid insulation under the slab.

Subgrades and Subbases for Slabs| Concrete Construction ...

Nov 22, 2017· Place a concrete floor on an unstable subgrade or subbase and you’ll probably pay for it two ways. During construction you’ll either waste concrete or end up with a floor that’s too thin in spots because the subgrade/subbase is uneven. After construction, the floor is likely to settle and ...

Shed Base: Concrete Slab or Gravel? |

The gravel is easier to remove and move than tearing up a concrete slab. What do local zoning and building ordinances say? Some locales consider any building, no matter how small or large, to be a permanent structure if it is erected on a concrete slab.

Products | Sand, Stone, Gravel, Limestone, Screenings ...

Brock Aggregates offers a wide range of durable, quality aggregate products including sand, stone, gravel, ¾ crush, crusher run limestone, and limestone screenings. Our products are suitable for a variety of applications including concrete production, roadbase, parking lots, interior slabs, exterior slabs, foundation drainage systems ...

Compact Fill Under Slab Ask the Builder

Compact Fill Under Slab Concrete bends and breaks. Use selfcompacting fill. Water helps compact. Concrete block ledges on footer. ... This gravel is the size of small green peas and it naturally compacts as it''s put into a void space. Visit a few local gravel pits in your area to see if they have this small rounded gravel. ... If you have to ...

why is it important to have gravel under a concrete slab ...

Mar 24, 2010· If you are just pouring a Slab without footings it is very important that you have firmly packed gravel, 46" and then about 6" of 3/4 stone, the 3/4 stone will allow the slab to float, and move, rather than crack when the gravel shifts.

Polyethylene Under Concrete Slabs GreenBuildingAdvisor

Jul 04, 2014· As long as the polyethylene is protected from sunlight as it obviously is when it is installed under a concrete slab it should last indefinitely. Whenever I have seen holes drilled through concrete slabs, I have never noticed any degradation in the polyethylene layer. My own advice is to install 6mil poly and stop worrying.

The Disadvantages of Pouring Concrete Over Existing ...

A wellpoured concrete slab with a deep, sturdy foundation can last for 30 to 40 years. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab''s lifespan. The condition of the existing slab is the primary factor that determines how long the new concrete will last.

gravel stone size for concrete slab

Stone, Gravel Sand Supplier Vienna VA | McCauleys Equipment 68 Crushed stone is best used for touchup for stone driveways, use in readymix concrete, septic fields, bedding for large pipes, filter stone, dry wells, concrete slab bedding, and residential drainage.

How To Pour A Concrete Slab For A Shed Zacs Garden

This is how to pour a concrete slab for a shed, taken from my recent slab pour with pictures. ... ordering concrete from a minimix comes in a minimum of 1 cubic meter. The size of my slab is approx x ... added 2cm of gravel and only had a spadeful of concrete left at the end! It''s always best to have more and not want it than the ...

Importance of Gravel and Sand for Concrete | Hunker

Apr 12, 2018· Concrete is made up of cement and water plus an aggregate composed of sand and gravel. The sand and gravel do more than act as filler, though. The size and amount of gravel added to a bag of concrete also determines the product''s volume, strength, and durability.

Gravel under footings | StructuralInt''l Bldg and Resid''l ...

Jul 07, 2004· Under a slab this is unlikely to be problamatic if continuous perimeter footings are founded below the bottom of the gravel layer. I personally believe that footings atop open gravel/stone is pure insanity. Want a backyard bubba nonastm type test? Go out and take your truck to a site with a pure gravel surface and gas it from a dead stop.

Site Preparation: 2. QUIKRETE: Cement and Concrete …

keep it from digging into the concrete. Float the entire slab. Stop floating when the entire slab in fairly smooth and the float leaves no visible marks. All stone and gravel in the mix should have been worked below the surface. 6. Cut the concrete away from the forms by running an edging tool along the forms to compact the slab edges.

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:

Best Crushed Stone for Patios

Best Crushed Stone for Patios. 1 1/2 inch and 2 1/2 inch Crushed Stone – Crushed stone gravel can be, granite, trap rock and limestone, depending on the particular quarry site. Crushed stone is produced by actually crushing the stone and then screening it to the right size.

Ask the Builder | Concrete slab needs quality self ...

What type of stone would be best for filling a cavity under a planned twocar garage addition? It is approximately 7 feet deep. The local concrete supplier sells recycled concrete for a really ...

Gravel under Concrete Slab | Pilots of America

Jun 28, 2016· 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 the slab so it drains off to the sides or bottom same as the concrete slab will drain, compacted it and called it good.

Gravel under Concrete Slab Turtlesoft

Concrete estimating unit cost for installation of gravel under a concrete slab. Unit Size: One square foot. Labor Costs ... with gravel chuted in from a concrete truck and spread by rake and wheelbarrow. You can adjust the cost up or down a little for different conditions.

Gravel Size Under Concrete Slab– Rock Crusher MillRock ...

Gravel Size Under Concrete Slab XSM is a leading global manufacturer of crushing and milling equipment (Gravel Size Under Concrete Slab),XSM also supply individual (Gravel Size Under Concrete Slab...) crushers and mills as well as spare parts of them.

Concrete Calculator Estimate Cement, Sand, Gravel ...

This is a free online tool by to calculate material consumption for a concrete structure , quantity of cement, sand, stone gravel required in different concrete ratios.

What Size Gravel To Use Under Concrete Pad Building ...

May 09, 2011· Can I use 3/4" (crushed/angular) gravel under a concrete pad? The pad is 5x5ft. I''ll pour 6" concrete over 6" of ??. I''m using 3 rebar. I have a lot of this gravel, and also unsorted sand, so I''m hoping one of those options are ok to use?

Subgrades Subbases for Concrete Slabs The Concrete Network

Excavate the soil to a depth of 8 inches, allowing 4 inches for the gravel base and 4 inches for the concrete slab. The soil should be graded, or sloped, so the excavation site''s center is ...