which sand to put underneath slabe

Ask the Builder Concrete slab needs quality self

Because I''d had to go in and repair many a sunken garage slab put in by some builder or remodeler cutting corners, I quickly realized that garage slabs can and will fail horribly if you don''t

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why sand under concrete? Fine Homebuilding

Aug 19, 2004 · I''m preparing to pour a finish concrete foor, slab on grade. The structural plans call for 4″ compacted gravel base, insultarp vapor barrier, 2″ of sand and 4″ of concrete. What purpose other than a base for the concrete does the sand serve? Why use it when yopu have thick insultarp?

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Polyethylene Under Concrete Slabs GreenBuildingAdvisor

Jul 04, 2014 · At my house, it is a slab above grade, with no poly under the slab, just sand backfill. When I remodeled, and added 3/4" xps, sleepers, and a plywood subfloor, and then wanted to install a finished oak wood floor I was worried about the floor cupping as I have heard stories.

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Sand as fill? JLCOnline Forums

May 29, 2001 · Re: filling under a slab with gravel We have often bedded a slab in gravel, that is, added 8 inches or so of gravel at the top of the fill immediately under a slab. We have put gravel around an underdrain in (or under) fill, but generally speaking gravel has not historically been used for fill (probably because of cost).

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How to Pack Down Rock Before Pouring Concrete Home

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

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Need someone to pump sand under my house (Metairie

Need someone to pump sand under my house (Metairie) Posted by TheWiz on 10/18/12 at 3:04 pm 0 0 As anyone in the New Orleans area knows, particularly Metairie, the ground is constantly disappearing to who knows where the frick to.

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Concrete Vapor Barriers What are They? The Concrete

Since the most common source is moisture in the ground beneath the slab, the solution is to completely take the ground out of the equation, by sealing the bottom of the slab. The best way to accomplish that is with a vapor barrier under the slab. Vapor retarders have been used since the 1950s.

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question about sand for laying paving slabs — Digital Spy

I accidentally ordered builders sand to mix with cement to lay my paving slabs, but realize I should have got sharp sand. question about sand for laying paving slabs. carola carola Posts: 405. Forum Member. so just to clarify I have put down already a base of hard core and whackered it down, then added a base of sharp sand.

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Concrete Floor Problems Building Science Corporation

May 26, 2008 · The sand layer becomes saturated with water from wet curing (water added to the top of the slab leaks down into the sand layer through service penetrations) or from irrigation (water added to the ground at the building perimeter enters the sand layer from the side or from underneath) or from rain (see wet curing and irrigation).

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No Sand Under Pavers?? Patio experts please help! Houzz

We put down a level of stone and compact it. Then we put down another level and compact it again. We repeat this several times to insure the paver stones will not shift and the ground stays level. We like to use a thin layer of sand as well, then compact again. After installing the pavers, we compact one last time to help lock the blocks in place.

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Pavers Over Concrete Paver Search

First, it is a good idea to get professional advice. So contact a licensed contractor and ask as many questions as you may have. Basically, installing pavers over concrete has its limitations. If money and time are not an issue to you, it is best to get rid of your concrete slab

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Concrete Floor Problems Building Science Corporation

May 26, 2008 · The sand layer becomes saturated with water from wet curing (water added to the top of the slab leaks down into the sand layer through service penetrations) or from irrigation (water added to the ground at the building perimeter enters the sand layer from the side or from underneath) or from rain (see wet curing and irrigation).

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Compact Fill Under Slab Ask the Builder

Concrete bends and breaks Use selfcompacting fill Water helps compact Concrete block ledges on footer CLICK HERE to Get Tim''s FREE & FUNNY Newsletter! DEAR TIM: My new home is under construction. I''m in a disagreement with my builder about what''s going to happen under my garage slab

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why sand under concrete? Fine Homebuilding

Aug 19, 2004 · I''m preparing to pour a finish concrete foor, slab on grade. The structural plans call for 4″ compacted gravel base, insultarp vapor barrier, 2″ of sand and 4″ of concrete. What purpose other than a base for the concrete does the sand serve? Why use it when yopu have thick insultarp?

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How to prepare a site for concrete: base, forms and rebar

Prep for CrackFree Concrete. A concrete driveway should last for decades if it''s properly installed. Good finishing techniques will make a slab look great for a while, but proper ground prep will keep it looking that way over its lifetime. Here are some great tips on how to prepare the site for a pour.

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Plastic under concrete floor or not??? Speedwake 2.0

Jan 22, 2006 · I dont think you want the surface of your floor to blister and peel away. There''s a lot of variables here, and in theory the vapor barriers sound good. But, check into it toroughly. Ive been doing concrete and been around concrete for a long time, and Ive never seen anyone put plastic under a garage slab around here.

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Gravel or Sand Below a Foundation engtips.com

Jun 05, 2007 · Saturated sand was dug out and replaced with damp sand, compacted. Footing was shoved back in, at proper grade, wiggled back and forth to "seat it" and column re set. All worked out fine. You don''t always have to discard compelted work. Oh yes, on the same site, dry sand did flow out from under the foundation of a large air compressor.

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What Kind of Insulation Should Be Put Under a Concrete

At that point, it is impractical to insulate under the existing slab without tearing up the existing floor or installing an insulate floor on top of the slab. It is best to plan for and install insulation under the concrete slab from the start. Rigid Foam Board. Thick rigid foam board is a suitable insulation to put under

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what kind of sand would i need for laying slabs? Yahoo

Mar 04, 2009 · Best Answer: Sharp sand,put it down dry and then mix in cement,ratio 3 or 4:1,spread it in a five spot dice pattern then lower the slab,tap it down level and keep everybody off them for a week if possible.the moisture from the soil/air will activate the cement and harden it.Doing it this way means it''s easier to level out slabs and they don''t sink or tilt plus there''s a measure of drainage

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Don''t Use Loose Sand Under Concrete Slabs Concrete

Will using a thin sand layer under floor slabs reduce subgrade or subbase support, causing cracking and poor joint performance, especially under repeated loadings such as forklift traffic? To gather data to help answer this question, The Aberdeen Group performed California Bearing Ratio tests on three soil samples with varying dry densities.

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Gravel or Sand Below a Foundation engtips.com

Jun 05, 2007 · Saturated sand was dug out and replaced with damp sand, compacted. Footing was shoved back in, at proper grade, wiggled back and forth to "seat it" and column re set. All worked out fine. You don''t always have to discard compelted work. Oh yes, on the same site, dry sand did flow out from under the foundation of a large air compressor.

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Mistakes to avoid when installing radiant heat in a

Radiant heating system design or installation mistakes that must be avoided. This article explains how to avoid some fatal mistakes when installing radiant heat in a concrete floor slab by describing an incompetent radiant heat floor installation along with an explanation of why things went wrong and how to avoid these errors. The workers in the photograph at page top, where our concrete slab

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How to move sand under house YouTube

Dec 20, 2013 · Solving Crawl Space Mold Problems in Michigan Crawl Space Encapsulation on the Handyman Show Duration: 4:15. Foundation Systems of Michigan 90,664 views

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How to Pour a RockSolid, WellInsulated Garage Slab

Are you pouring a slab for a regular garage or something a little more heavyduty, like one reader posted about in the Fine Homebuilding construction forum? Fellow homebuilders offer their advice on how to pour a rocksolid, wellinsulated garage slab.

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How Much Base Material Do I Need for Walkways, Patios and

How Much Base Material Do I Need? Deciding the correct amount of walkway base material is actually quite simple. For sidewalks and patios or any other light duty areas you will only need a 4 inch base of 3/4 inch quarry process or RCA beneath a 1 inch layer of concrete sand.

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What Can I Use for Padding Under an AboveGround Hunker

Nov 08, 2017 · A padding layer is crucial when installing a pool on a concrete pad, but the most common form of padding — a layer of sand — is not suitable as a base layer in this situation. Over time, sand will shift and leak out from under a pool installed on concrete, ruining its ability to offer any kind of cushion.

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Subgrades & Subbases for Concrete Slabs The Concrete Network

Subgrades and Subbases for Concrete Slabs then you can put a slab right on top of it without any extra layers. The problems with that are that the soil may not drain well and it can be muddy during construction if it gets wet, it may not compact well, and it can be difficult to get it flat and to the proper grade. If the underslab

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How to lay steppingstones on gravel. Guide on laying

Stepbystep instructions on how to lay steppingstones on gravel. Watch our video or look at our pictures of the methods we used when we laid out stepping stones on a graveled pathway. Read our hints and tips on the best way to lay individual paving slabs to create a

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How to Prepare Soil for a Concrete Slab Garden Guides

Sand compacts well and provides an optimal base on which to pour concrete. The amount of sand you will need depends upon how much soil you removed. A concrete slab may be 4 to 6 inches thick, so add sand until it reaches the proposed bottom of your slab. Pack the sand with a sand compactor, available from construction rental stores.

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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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Laying paving slabs on soil/earth. What would you do?

Weed membrane under the sand? I then just put the biggest, cheapest slabs I could find on top of that. Meh, we had play house – put it on stilts and then on a paving slab under each corner.

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Laying paving slabs on soil/earth. What would you do?

Weed membrane under the sand? I then just put the biggest, cheapest slabs I could find on top of that. Meh, we had play house – put it on stilts and then on a paving slab under each corner.

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Don''t Use Loose Sand Under Concrete Slabs Concrete

Will using a thin sand layer under floor slabs reduce subgrade or subbase support, causing cracking and poor joint performance, especially under repeated loadings such as forklift traffic? To gather data to help answer this question, The Aberdeen Group performed California Bearing Ratio tests on three soil samples with varying dry densities.

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Does anybody use sand as a base before they pour concrete

Does anybody use sand as a base before they pour concrete of a driveway? I was told by one of the contractor that I needed to put a layer of sand before I poured concrete for the driveway. Another contractor told me that no sand is used because it is the cause

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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 jessie. 7 Replies. I have used as much as 5'' of sand under a slab. The sand was dry, contained by block walls and compacted. We put in 10 inches of sand, by the way.

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Why is it that my paving slabs have become uneven through

Nov 06, 2007 · Why is it that my paving slabs have become uneven through time? The whole lot wants coming out. Slabs can be saved and relayed. The patio is laid on sand putting more sand under will only improve short term. If its sharp sand sometimes that is worth saving to use with cement/water, but needs to be clean sand.You will probably need more sand

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