Pea gravel for interior floor slab support - Geotechnical ...

Jun 06, 2006· Six inches of pea gravel, I assume that the max particle size is 0.5" or so, should be fine support for most floor slabs. I have used it beneath a waffle type slab on very expansive weak shales and/or hard clays. The ribs of the slab bear on the pea gravel with a …

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?

gravel stone size for concrete slab - easnadh.nl

what size of gravel is used as a substrate for concrete slabs. conditions and type and size of stone may affect the value of, concrete slabs were installed to investigate the electrical, gravel used was 1½" Crusher . [Inquiry] Pouring A Concrete Slab - Do I Need A 4" Gravel Base, Contact Supplier

The Recommended Gravel Base for a Concrete Driveway

The strength and durability of a concrete driveway are not only determined by the type of concrete mix but also by base or sub-base over which it's poured. A layer of gravel placed between the ...

Compact Fill Under Slab - Ask the Builder

Compact Fill Under Slab - Concrete bends and breaks. Use self-compacting 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.

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.

How much gravel under a slab? - tractorbynet.com

Sep 10, 2002· Figure gravel and sand at or about twenty five hundred pounds a yard. I have a bud who has a fleet of trucks hauling sand and gravel. He's told me to figure a ten yard load will cover four inches five hundred square feet. I've heard some of the cities now are getting away from wanting cushion sand under a slab while others still demand it.

How to Pack Down Rock Before Pouring Concrete | Home ...

Gravel is especially important in clay soil because it doesn't drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains. Gravel allows ...

Shed Base: Concrete Slab or Gravel? | DoItYourself.com

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.

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.

Sand under slab instead of gravel - GreenBuildingTalk ...

Mar 04, 2013· I have used as much as 5' of sand under a slab. The sand was dry, contained by block walls and compacted. Never a problem. My guess is that if the sand is quite wet there is a chance of some settlement when the sand drains.

what size gravel is used under a concrete slab - ypma-ict.nl

Gravel Size Under Concrete Slab XSM is a leading global manufacturer of crushing and milling equipment Gravel Size Under Concrete SlabXSM also supply individual Read more Should sand be tamped prior to pouring concrete. Importance of Gravel and Sand for Concrete | Hunker. Concrete is made up of cement and water plus an aggregate composed of ...

Gravel under concrete footing - GreenBuildingAdvisor

Apr 01, 2015· Thanks guys. Since it appears that using gravel under the footings will be OK, I would appreciate your thoughts about whether I could skip installing drainage pipes inside the footing based on my logic that water under the slab would equalize with that outside the footing, where the perimeter drainage system would remove it.

Proper Subgrade Prep| Concrete Construction Magazine ...

Sep 20, 2007· With slab-on-grade foundations, an alternative to native soil material may be used to restore grade. These imported fills may include granular materials such as sand, gravel, or crushed stone. These high-strength and permeable materials offer low compressibility, which is ideal for a 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 ...

what size is stone to use in concrete slab basement

Concrete, footings, and foundations Flashcards | Quizlet What is the required thickness of the moisture barrier that must be used under the basement floor (slab)? the floor slab , The footing for a wood foundation must have a minimum depth of _____ of crushed stone or sand 35" , _____ are a convenient way to limit the size of the placement of ...

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.

Gravel or Sand Below a Foundation - eng-tips.com

Jun 05, 2007· Can someone tell me the true significance of placing "x inches" of gravel or sand below a foundation? and should it always be used? Also, is there a reference made to this procedure in ACI? If so, what is the ref. number? (Trying to find additional literature on this subject; i.e.: engineering manuals, textbooks, etc.) Thank you in advance. Tom P.

Concrete Slab - How to install a slab from start to finish

POURING A CONCRETE SLAB - HOW WE DO IT. Like I said before, you only get one chance to do this right. Pouring and finishing concrete floors is a skilled trade. It is usually best to hire a quality concrete contractor to "start out on the right foot." You can check out my Video that shows you how we pour a concrete slab.

Shouldn't I Have Gravel Under Concrete Footers? - Concrete ...

Sep 29, 2012· Gravel was always used under every concrete job (footers, slabs, driveways, etc.). I see from the code that you sent me that gravel isn't required and that the concrete should be on soil, but where the heck does that rain water in the earth (and around and under the concrete) go when it rains I wonder? hmmm.

Why Put gravel under concrete? - Google Groups

May 06, 2010· I wish you had asked him for a better clarification. Coarse gravel, like 57 stone, under a slab is used as a capillary break to prevent ground moisture wicking up through the concrete.

Polyethylene Under Concrete Slabs - GreenBuildingAdvisor

Jul 04, 2014· A. The issue has come up a few times on our Q&A forum. According to my understanding, the main reason for the degradation of polyethylene is exposure to UV light (sunlight). 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.

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:

compacting gravel under a slab - JLC-Online Forums

Dec 07, 2004· Re: compacting gravel under a slab Tucker: With 2 to 3 feet of rock, I fail to see why you need either poly or insulation under the slab, I think I would opt for the "oozing" and the thickening effect of the "waffle" bottom, I would think that structurally it turns a 3 1/2" slab into something more like a 6 or 8" slab from a structural standpoint.

How to Calculate Concrete Needed To Pour a Slab | Hunker

Apr 18, 2018· It’s crucial to accurately estimate how much concrete you’ll need for a poured slab. After all, you don’t want to buy more bags of ready-mix concrete than necessary. Fortunately, it’s easy to measure your slab and convert those numbers into cubic …

Gravel Foundation Recommended for the Storage Sheds

A concrete slab is going to be way more expensive than a gravel pad, but this is not why we would say get a gravel pad. Water will just rest on a concrete pad vs. a gravel pad and especially the 3/4" gravel pad which will let water drain right through the foundation helping protect your building.

Gravel Size Under Concrete Slab– Rock Crusher Mill-Rock ...

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.

Pouring & Finishing Concrete Slabs - QUIKRETE

Pouring & Finishing Concrete Slabs. Concrete is one of the most economical, versatile and durable building materials available. Build a sidewalk, patio, or floor with QUIKRETE concrete …

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

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,

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

Whatever is used needs to be “self-compacting.” ... What else would you do to ensure the concrete slab that will be poured on top of the fill will not crack or settle? ... I’d put a great ...

Choosing Best Gravel For Concrete Pad - Concrete & Paving ...

Jan 06, 2008· I've used pebble gravel (the rounded off gravel) which I would think provides the best drainage but also used a 5/7 gravel. can 5/7 always be used or can crush and run be used in ... 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 ...

Subgrades & Subbases for Concrete Slabs - The Concrete Network

Subgrades and subbases for concrete slabs: Tips for ensuring good support Concrete Slab Finishing Tips ... Subbase—this is a layer of gravel on top of the subgrade; Base (or base course)—this is the layer of material on top of the subbase and directly under the slab ... If the under-slab support is bad enough, you can then get differential ...

what size gravel for slab base - latavernadelre.it

Can also be used in under slab of residential, commercial and industrial floors. Silt content is under 8% to allow for drainage. Granular B gravel Also known as pit run or bank B. Granular B gravel is a blend of sand and stone. The stone size varies from pit to pit. It is used as a base material for building roadways, parking areas and driveways.

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