why do i need crushed stone under concrete

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what do you use under concrete? - Everything About Concrete

what do you use under concrete? - Everything About Concrete

Q We are pouring our garage floor on a new build, what kind of material do we use under it? The builder currently has some recycled concrete but we need to fill a little more space and level it out We now have heard that the recycled concrete is not the way to go, but to use pea sized wash stone, that it compacts and levels better

Crushed Stone Under Concrete: Why It's Needed

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 firstPlacing crushed stone under concrete serves several purposes and can provide the following benefits

Do I need crushed stone/gravel under my retaining wall ,

Do I need crushed stone/gravel under my retaining wall ,

Apr 22, 2008· Do I need crushed stone/gravel under my retaining wall? I am rebuilding a wall next to my driveway out of the home depot block rocks/retaining wail rocks The deal is, that the root system behind the wall has held it all together, so there won't be a lot of pressure How necessary is doing compacted stone/gravel, and how deep if I'm .

Do I Need to Lay Gravel Before Pavers? | Hunker

Do I Need to Lay Gravel Before Pavers? | Hunker

Do I Need to Lay Gravel Before Pavers? By Aurora LaJambre SAVE; Pavers are a versatile, strong paving material used to build walkways, driveways and other outdoor surfac , If you want to pave over concrete, you can set pavers in sand or mortar over the existing surface , Gravel is a flexible base that absorbs ground tension to prevent .

Soil Under Slab - No Crushed Stone Used - Building ,

Soil Under Slab - No Crushed Stone Used - Building ,

Sep 05, 2010· Normally crushed stone is used under the slab for three reasons: 1 It is easily compacted, hence will form a very strong surface to place concrete on, minimizing the potential for settlement of the concrete 2 It is highly permeable, hence allows moisture under the concrete to drain away from beneath the slab 3

Gravel under garage floor? - GreenBuildingAdvisor

Gravel under garage floor? - GreenBuildingAdvisor

Apr 19, 2016· I like crushed stone because it drains best, and naturally compacts best Find out what "gravel" means in your area,if you are not sure Without trying to add confusion to Dick's and Charlie's ideas, another way to go, if you decide to insulate under the slab, is to extend the foam out 2 feet beyond the garage and pour a monolithic slab with .

Crushed Stone Archives - Page 2 of 11 - Braen Stone

Crushed Stone Archives - Page 2 of 11 - Braen Stone

Why Do I Need Crushed Stone Under Concrete? 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

Shed Foundations Made Easy | The Best Types Explained

Shed Foundations Made Easy | The Best Types Explained

Sep 17, 2012· There is already a crushed stone floor Can I dig a trench, fill it with stone and lay 4×4’s or 2×4’s on top of it for a foundation? If so, would they have to be pressure treated? Do I even need crushed stone if use pressure treated wood on top of dirt Would concrete blocks or pavers with 2×6 headers be a better idea?

Compact Fill Under Slab - Ask the Builder

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 , The steel bars need to be placed so they line up with the concrete block pilasters , If you have to use crushed stone, be aware that it requires mechanical compaction so the pieces of gravel interlock .

Key to a sound concrete slab is compact fill underneath ,

Key to a sound concrete slab is compact fill underneath ,

Aug 07, 2015· DEAR TOM: Uncompacted fill under a concrete slab -- be it for an entire home, an exterior patio, a front porch or a driveway -- is a recipe for disaster

Polyethylene Under Concrete Slabs - GreenBuildingAdvisor

Polyethylene Under Concrete Slabs - GreenBuildingAdvisor

Jul 04, 2014· In the old days, not much — just dirt Eventually, contractors discovered that it made sense to include a 4-inch-thick layer of crushed stone under the concrete The crushed stone provides a capillary break that reduces the amount of moisture flowing upward from the damp soil to the permeable concrete

What should the ratio of crushed rock and sand for a paver ,

What should the ratio of crushed rock and sand for a paver ,

The method is much different in the frozen north than the sunny south I do not like crushed stone with a gravel overcoat the sand will eventually settle into the stone and leave voids under the pavers I am a firm believer in stone dust 3/8 stone dust, wetted and compacted is like a concrete base

Pad: Concrete Or Crushed Stone? - Pool and Spa Forum

Pad: Concrete Or Crushed Stone? - Pool and Spa Forum

Sep 16, 2009· It's a shame you can't do it yourself We just got some crushed stone to put under our concrete pad as well as to do a patio around it and it was only $13300 for the crushed stone and the sand we need for the pavers as well The concrete we did ourselves as well, borrowed a friends concrete ,

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

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

What Kind of Crushed Rocks Do You Use for Artificial Grass ,

What Kind of Crushed Rocks Do You Use for Artificial Grass ,

Turf Application Your crushed rock layer is typically 1 to 4 inches deep within a 5-inch excavated area After spreading the proper rock ratio onto the ground, you need to compact it to a level .

Does anybody use sand as a base before they pour concrete ,

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 ,

compacting gravel under a slab - JLC-Online Forums

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

Why Put gravel under concrete? (2019 UPDATE)

Why Put gravel under concrete? (2019 UPDATE)

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

Gravel or Sand Below a Foundation - Foundation engineering ,

Gravel or Sand Below a Foundation - Foundation engineering ,

Jun 05, 2007· If you are wanting to provide a working platform to prevent disturbance due to steel placing, leveling course, to minimize precipitation disturbance, I would use a layer of crushed stone or a blinding mat (mud-mat) or a well graded sand and gravel (like a subbase or base course)

Crushed stone - Wikipedia

Crushed stone - Wikipedia

Crushed stone is one of the most accessible natural resources, and is a major basic raw material used by construction, agriculture, and other industri Despite the low value of its basic products, the crushed stone industry is a major contributor to and an indicator of the economic well-being of a nation

Why Should You Put Gravel Under a Deck? - Home Guides

Why Should You Put Gravel Under a Deck? - Home Guides

Dec 17, 2018· Why Should You Put Gravel Under a Deck? , When used beneath a concrete footing gravel prevents water from pooling up underground which reduces issues related to erosion that can compromise your .

Information on the Do's and Don'ts concerning Foundation ,

Information on the Do's and Don'ts concerning Foundation ,

Information on the Do's and Don'ts concerning Foundation Drainage Concrete or Masonry Foundations (NEC R4051) Drains shall be provided around all concrete or masonry foundations that retain earth and enclose habitable or usable spaces located below grade

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

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

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

What Kind of Base for Pavers? | Home Guides | SF Gate

What Kind of Base for Pavers? | Home Guides | SF Gate

Dec 14, 2018· Roughly crushed stone makes a good base for pavers that will be used more regularly A base of 4 to 6 inches of well-compacted stone pieces provides a sturdy and stable foundation for ,

Gravel under concrete footing - GreenBuildingAdvisor

Gravel under concrete footing - GreenBuildingAdvisor

Apr 01, 2015· 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

Crushed Stone Calculator: Free Online Tool

Crushed Stone Calculator: Free Online Tool

See for yourself why a crushed stone calculator is so valuable, and how to use it properly Why do I need a crushed stone calculator? While there are specific mathematical calculations that can be performed in order to determine the quantity of crushed stone to purchase for a project, this may not be the ideal route for you

How important is gravel under a concrete sidewalk? (Home ,

How important is gravel under a concrete sidewalk? (Home ,

How important is gravel under a concrete sidewalk? I got an estimate from a company on your list to replace my old, beat-up concrete sidewalk When they dug up the old sidewalk, there was no gravel underneath, and they wanted several hundred more dollars to dig out some of the dirt and put in a gravel bed - is this necessary?

Choosing Best Gravel For Concrete Pad - Concrete & Paving ,

Choosing Best Gravel For Concrete Pad - Concrete & Paving ,

Jan 06, 2008· how do you choose? 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 - Concrete & Paving - Contractor Talk

Self-Compacting 3/4

Self-Compacting 3/4" stone - JLC-Online Forums

Apr 29, 2003· I have a question about 3/4" crushed stone I read several places that 3/4" crushed stone is "self-compacting" That is, you dump it in a trech (as in under a concrete footing or floor) and you don't have to compact it with a plate compactor - it is already as "compacted" as it needs to be

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

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

You are quite excited, but there is just one problem: It requires crushed stone, and you have no clue how to calculate how much you will need Crushed stone is a material that is typically used as a base or underlayment, upon which the stuff that actually shows -- for example, the concrete of a patio-- will rest Guessing is rarely a good .

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