why put crushed limestone under concrete slab

Crushed Stone or Crushed Concrete - Modern House …

I would make sure you have at least a couple of inches of real stone under the slab to keep the capillary break in place. But below that you could use crushed concrete.

Gravel under garage slab ?? | DIY Forums

Sep 30, 2004· It is still good construction practice to put a layer of crushed rock under the slab. 1. The crushed rock can be leveled more easily than native material. This makes for a uniform thickness slab, which means fewer cracks 2. The crushed rock will let water from the concrete pour pass through. This you will give a better slab with …

Soil Under Slab - No Crushed Stone Used - Building ...

Sep 05, 2010· Soil under slab - No crushed stone used. My apologies if I am in the wrong forum place for this discussion, but looking for some answers and hoping someone out there can help. We are having a 16x24 two-story addition built onto our existing house. We do have a GC for the project. Our contract states that they would put crushed …

Crushed Stone Under a Spread Footing - Geotechnical ...

Dec 17, 2009· Crushed Stone Under a Spread Footing Crushed Stone Under a Spread Footing SoonerSoilGuy (Geotechnical) (OP) 20 Aug 09 13:48. Hey all, we all have seen recommendations like remove a foot or two underneath the proposed footing level and replace it with crushed stone bridge lift. Can someone explain me as to why we …

Gravel under concrete footing | GreenBuildingAdvisor.com

Apr 02, 2015· (I would still install pipes under the slab for radon mitigation.) Answered by Timothy Denny Posted Apr 2, 2015 6:48 AM ET 4. Timothy, Some builders fill the bottom of their excavation with 4 inches of crushed stone, and then pour their footings on top of the crushed stone. If you do that, water can flow readily under the footings. If …

Why Do I Need Crushed Stone Under Concrete-Henan …

link news crushed stone foundations bapanorg. Why Do I Need Crushed Stone Under Concrete In order for your concrete slab to last as long as poss...

Better Garage Floors| Concrete Construction Magazine ...

Better Garage Floors Tips for pouring stronger, crack-free concrete slabs.

Proper Subgrade Prep| Concrete Construction …

Proper Subgrade Prep Proper subgrade compaction reduces concrete failure concerns

why sand under concrete? | Fine Homebuilding | …

I'm preparing to pour a finish concrete foor, slab on grade. The structural plans call for 4" compacted gravel base, insul-tarp vapor barrier, 2" of sand and 4" of concrete.

Why Put gravel under concrete? - Google Groups

May 06, 2010· I have poured many small sidewalks and shed floors and never put 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 …

Basalt Gravel Quarries Texas - Henan Mining Machinery …

basalt quarry for sale by owner Coal Surface Mining SAMAC. Boral Companies – Boral Quarries . The quarry is a basalt quarry, which provides various construction materials ... why put gravel under concrete slab on grade;

Concrete Subbase & Subgrade Defined - The Concrete …

Subgrades & Subbases Home What is a Subbase/Subgrade? What about the Soil? How Does the Subgrade Affect Slab Design? How to Prepare the Subgrade How to Compact Soil Before Pouring Concrete

Foundations - Fill Under Slab - Carnation Construction

Home Site Map - S teps - Foundations-. Fill Under Slab (This step has already been done as part of forming the footings, so this separate …

garage slab concrete - subbase [Archive] - Woodwork …

May 01, 2006· Question for you smart blokes: how much subbase (crushed rock) should I be putting under the slab if any? The ground is ... it states it is 'optional' and is only to reduce friction under the slab. Doesnt really state that the concrete will be unworkable or leaving a dry cemented aggregate. However, what you have stated …

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.

Gravel Foundation Recommended for the Storage Sheds

Gravel Foundation Recommended for the Storage Sheds. Posted by Alan Bernau Jr on Fri, Jun 22, 2012 Tweet; Alan's Factory Outlet Recommends a Gravel Foundation for the Storage Shed. 10x20 a-frame wood storage sheds delivered on a gravel base that was recessed on the one end. The customer framed timbers around the base to help keep …

How much gravel under concrete? - TractorByNet.com

Nov 26, 2002· How thick should I put a layer of gravel that I will (someday) pour concrete over? What is the minimum thickness and …

USES OF CRUSHED LIMESTONE | Texas Crushed Stone Co.

1) Road Base. 2) Under slab fill. 3) Aggregate for making concrete. 4) Sand for making concrete. 5) Aggregate for mixing hot mix asphalt. 6) Sand for making hot mix asphalt

Can I use the crushed remains of an old concrete slab …

Can I use the crushed remains of an old concrete slab as a base for a new slab? ... gravel under concrete slab? is it absolutely required? Hot Network Questions How to politely tell recruiters you're only interested in jobs in a specific location? Add longer comments to steps of some calculation Is it viable to build a city with a round based ...

crushed stone under concrete tile - crusherasia.com

crushed stone under concrete tile - SBM mining equipments …. Heavy construction equipment refers to heavy-duty vehicles, specially …

Concrete slab front porch, large void underneath ...

Apr 14, 2010· Put up a sail Just kidding, Just dig out beside it and pour more concrete with pea gravel watered down so it will fill the void. basically your are …

Sand under slab instead of gravel - GreenBuildingTalk ...

Mar 04, 2013· Sand under slab instead of gravel. Last Post 04 Mar 2013 08:14 PM by ... that's one thing. If it's due to high water table, I might be inclined to build up the slab area with crushed stone (aka "gravel" in some places) before adding the foam and VB. If the area is on a generally sloped lot, a perforated pipe within the stone to drain the …

How Much Crushed Stone Do You Need? A Sure-Fire …

How much crushed stone do you need to tackle that DIY project? Use this sure-fire formula to figure out the quantity needed, removing the guess work.

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

Mar 24, 2010· Why is it important to have gravel under a concrete slab? ... for a residential garage use, is 6" of a mix of number 5 and number 7 limestone. the soil should be compacted prior to placement of the limestone gravel. Sand is unwise, unless your soils are very well drained. If the soils are wet, or have a great deal of clay and ...

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.

Crushed Limestone Concrete Aggregate | Texas Crushed …

As the gravel deposits are depleted and people learn the advantages of crushed aggregate, the use of crushed limestone in concrete increases. Crushed limestone has several important advantages over river gravel as an aggregate for concrete. First, for a given amount of cement in the mix, crushed limestone concrete will have an …

Concrete Floor Problems | Building Science Corporation

BSI-003: Concrete Floor Problems. Joseph Lstiburek. May 26, 2008 . Here is a pop quiz for you folks that are bored of Jeopardy. California is desert. Florida is a swamp. We build concrete slab-on-grade in both places. Which place has more slab moisture problems? Yes, you guessed it, California. Why? In California they place sand …

Do you need to put gravel under a concrete pad? | …

May 12, 2008· Do you need to put gravel under a concrete pad? Update: I am putting a basketball court in ... Why Put Gravel Under Concrete. Source(s): https://owly.im/a8Vxr. nishioka · 1 year ago . 0. Thumbs up. 0. Thumbs down. Report Abuse. Comment. Add a comment. Submit · just now. well, you need to remove any …

why put crushed limestone under concrete slab

How much gravel under concrete?TractorByNet · How thick should I put a layer of gravel that I will(not running crush which I think would be more prone to frost heevesHow much gravel under concrete. Chat With Sales » crushed stone under concrete tilecrusherasia. crushed stone under concrete tile,crushed limestone such as is used under asphalt roads.why would you pour a slab of cement then put ...

Concrete Vapor Barriers - What are They? - The Concrete ...

Vapor Barriers for Concrete Slabs Home Why is there water vapor in concrete? What problems does moisture create? How do we test moisture-vapor transmission?

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