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The problem is the crush and run - or "crusher run" as I've heard it called - is compact-able - and 57 stone - gravel - naturally is compacted when it's dumped/spread. so you have the chance of settlement under/of the concrete and or cracking of a slab with a compact-able sub-base - unless you are able to fully compact it in lifts - layer by layer.
Crusher run is typically used underneath concrete slabs, patios, driveways, sidewalks, and walkways and ranges in sizes from ½” to 4” with stone dust. How Much Crusher Run Do You Need? Crusher run is ordered by the ton. Since crusher run weights approximately 2,500 lb. per cubic yard, first determine the volume requirement of your project.
Despite the fact that there are many ways in which crusher run can be used, one of its main functions is as a base or sub-base filler. Contractors and homeowners may choose to use the material as a base layer beneath concrete and asphalt, or as the sub-base for road systems and driveways.
· Adding crushed stone under your concrete slab will provide a level surface for your foundation. Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Similarly, if there are roots or plants under your slab, they may rot and cause unevenness.
Crusher run is frequently used as a base, sub-base or surfacing material, all of which will have their own depth requirements. Generally speaking, you’ll want to allow for approximately 4″ of depth for a base filler, 3-4″ for a sub base and 2-3″ for surfacing work.
· Most road base material approved by the local DOT is suitable for the subbase. “We use 6 to 8 inches of crusher run,” says Steve Lloyd, Lloyd Concrete Services, Forest, Va. “It includes lots of fines and we compact it to 98%. We will not use #57 stone, that’s like trying to place a slab on marbles.
The Material Properties of Stone DustThe Superior AlternativesWhy Won’T Stone Dust Just Blow away?The Bottom Line · Re: Gravel under concrete pad I'd use "crusher run" vs #57. Crusher will pack much better than 57. It doesn't matter what you use for a sub base as long as it is compacted to a suitable load bearing value for the pad.
hi 1st of all depends what the grounds like underneath now ,if the sub base is solid then 100mm minimum of type 1 /crush and run should be used with a taram membrane which allows water through but stops it coming back through ,as for grit sand usually 40mm is the prefered depth ,i have 30mm screed bars so i use 30mm the less the better
You should consider using #57 stone or clean crusher run which is a multi-size gravel. #57 stone provides excellent drainage and very little settling. Clean crusher run should be mechanically compacted to prevent settling. Larger gravel is difficult to level, very fine gravel is not solid. Wouldn't concrete be a better foundation for a shed?
It’s an ideal layer under artificial grass but looks great as a decorative feature in landscaping too. Rock dust is also a good option for driveways and walkways. Crusher dust works well as a base layer under concrete slabs, water tanks, piping, and …
Add and compact crusher run in 4-inch layers until the rough driveway form is achieved. Two to three layers of crusher run are typically required to reach this point, depending on the depth of the excavated driveway space. Wait to compact the final layer of crusher run until it has been shaped. Step 7
CR-8 Crusher Run. Easy to handle base material. Used under concrete, asphalt, sheds, patio and hardscape stone. Can be used as exposed aggregate for driveways, pathways, sidewalks and parking areas. Size classification is 1″ down to dust. Material Colors Available: Dark Gray, Blue Gray, Off-White & …
Large blocks of concrete or asphalt go through a crusher that mills them into crushed concrete. The final product is concrete stones roughly 3/4″ in size, similar to gravel. It also includes stone dust to fill the space between the rocks and ensure that the pieces interlock. This allows crushed concrete to compact into a more solid layer.
· Typically, there is one or two products crushed by concrete jaw crushers that you would use, the first being three-quarter inch road base which the particle sizes are 3/4 inch, right down to quite a fine sand or powder and this product will compact very nicely, it may have to be the top dress over the years depending on the weather conditions .
Quarry process stone—also known as crusher run—is another good option for the top level of a driveway or walkway. Composed of a blend of smaller crushed stone and stone dust, crusher run typically.
You should consider using #57 stone or clean crusher run which is a multi-size gravel. #57 stone provides excellent drainage and very little settling. Clean crusher run should be mechanically compacted to prevent settling. Larger gravel is difficult to level, very fine gravel is not solid. Wouldn't concrete be a better foundation for a shed?
Stone dust, sometimes called rock dust, is a byproduct of crusher run that’s provided the bedding layer for many a paver project over the years. While it can work in some construction applications, there’s a growing recognition that sand – washed concrete sand in particular – has proven far more stable and exhibits properties that make .
· In dry climates you have to put sand or crusher fines over the vapor barrier (that is, directly under the slab)to keep the slab from curling.I would defer to your concrete guy, but technically there is no reason why you can't put down your VB, your insulation, and then concrete.
hi 1st of all depends what the grounds like underneath now ,if the sub base is solid then 100mm minimum of type 1 /crush and run should be used with a taram membrane which allows water through but stops it coming back through ,as for grit sand usually 40mm is the prefered depth ,i have 30mm screed bars so i use 30mm the less the better
Crusher run is a highly compacting, well-draining material that is second only to sand as a base for pavers. It compacts tightly, forming a base that can be walked on without harming the bedding.
· The concrete can be crushed down to specific sizes, cleaned so that unwanted debris is removed from the mixture, and reused as a solution to a number of construction and landscaping problems. How can I use Crushed Concrete? Walkways / Pathways Crushed Concrete can be reused to create beautiful walkways in your home or business landscaping.
· 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. Brick however, and concrete block for that matter, I would not use. Brick is much softer than concrete, and concrete block is also much more porous than poured concrete.
Gravel costs $0.50 to $2.50 per square foot on average when covering an area 12" deep (a cubic foot), depending on the type. Base gravel, crusher run, slate, shale, and crushed concrete are the cheapest at $0.50 to $1.50 per square foot, while colored and decorative gravel run $3 per square foot.
The problem is the crush and run - or "crusher run" as I've heard it called - is compact-able - and 57 stone - gravel - naturally is compacted when it's dumped/spread. so you have the chance of settlement under/of the concrete and or cracking of a slab with a compact-able sub-base - unless you are able to fully compact it in lifts - layer by layer.