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why do i need crushed stone under concrete

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

 · 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.

Why Put gravel under concrete? (2019 UPDATE)

 · 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 Should You Put Gravel Under a Deck? | Home Guides | SF ...

 · 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 ...

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 inch excavated area. After spreading the proper rock ratio onto the ground, you need to compact it to a level ...

Gravel Or Crushed Stone Under Concrete

Gravel Or Crushed Stone Under Concrete Calcite Deep Processing Plant in Belgium Calcite deep processing production line in Belgium is composed of PE250×400 jaw crusher, electro-vibrating feeder, HXM micro powder mill, hoister, electrical cabinet, packing machine and pulse dust collector.

Why Put gravel under concrete? - Google Groups

 · Why Put gravel under concrete? Showing 30 of 30 messages. Why Put gravel under concrete? ... to measure the amount needed), that I need to put gravel under the concrete. WHY? I should mention that I always put lots of small to medium sized rocks under concrete to save on the amount of concrete needed. ... a Ready Mix truck tipped over and ...

Shed Foundations Made Easy | The Best Types Explained

 · 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?

Gravel under garage floor? - GreenBuildingAdvisor

 · 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 Limestone Uses & Benefits

Under Slab Fill – In new construction, concrete slabs cannot simply be laid directly on the earth. Instead, a layer of crushed stone needs to fill the area beneath the slab. This keeps the concrete level, allows for good drainage, and prevents settlement cracks. Limestone aggregate is commonly selected for …

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.

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.

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. ...

gravel or crushed stone under concrete | Mobile Crushers ...

 · gravel or crushed stone under concrete. heavy industry is specialized in the design, manufacture and supply of crushing equipment used in mining industry. ... Why Do I Need Crushed Stone Under Concrete? By adding crushed stone under concrete, ... - 1/4″ Washed Clean Stone - 3/8” Pea Gravel - 3/8″ Washed Clean Stone - 3/8″ White ...

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

 · 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.

Shed Foundations Made Easy | The Best Types Explained

 · 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?

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

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

How to Calculate How Much Crushed Stone I Need | Home ...

A crushed stone calculator will help you figure out the amount of crushed stone you'll need for a patio, path or driveway project. Knowing approximately what you'll need will make your project go ...

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

 · 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 ...

Why Should You Put Gravel Under a Deck? | Home Guides | SF ...

 · 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 ...

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.

compacting gravel under a slab - JLC-Online Forums

 · 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 under concrete footing - GreenBuildingAdvisor

 · Crusher-run gravel compacts well but does not drain very fast -- at least not as fast as 3/ 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/ inch crushed stone can be used under footings. So can rigid foam. An engineer may disagree.

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

 · 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

Should vapor barrier in slab be under 4 in. of gravel or ...

 · part question: 1) I'm building a car garage with upstairs apartment in zone 4, 26' x 28'. getting different opinions on whether the vapor barrier ml plastic- should be under the 4'' of gravel or on top of the gravel directly under slab? Some are saying it is not good to pour concrete right on plastic, although this seems to be the most common way to do it.

Understanding Basements | Building Science Corporation

 · The concrete slab should be sealed to the perimeter basement wall with sealant (the concrete slab becomes the “air barrier” that controls the flow of soil gas into the basement). The crushed stone drainage layer under the basement concrete slab should be vented to the atmosphere to control soil gas . Atmospheric air pressure changes are on ...

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

 · 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

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

 · 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 ...

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.

Sand under slab instead of gravel - GreenBuildingTalk ...

 · I'd want to know why the sand is so wet in the first place. If it's just due to weather exposure and would drain/dry if under cover, 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 …

What Type of Base Do You Need For a Hot Tub? | Spa ...

I definitely wouldn’t do flagstone under a hot tub. You are right, too hard to get perfectly level and smooth so the whole base is supported evenly. I would just keep the pad, do a decorative crushed stone around the perimeter of the spa to cover up the edges of the concrete pad, then do …

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.

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

 · For the best answers, search on this site https://shorturl.im/avT7K I would suggest using 6" of compacted sand and 4' of concrete. It is necessary to have the original concrete floor broken if not it should be broken to allow any trapped moisture to drain to the sub grade under the original floor.