·1 The type of gravel typically used under a concrete slab is known as crusher run or crushed stone base This material is a blend of different sized crushed stone particles which create a solid and stable base for the concrete 2 The size of the gravel used under a concrete slab is important
·Putting gravel under concrete isn t necessary but it comes with numerous benefits Some key things that gravel does are Strengthen the concrete mix Keep the slab in place Highlight weak points Help with drainage Provide a level surface Best Type of Gravel to Use as a Base for a Concrete Slab
Concrete strength also comes into play but most slab concrete is around 3000 to 4000 psi so it s not a major factor The tensile strength of concrete is typically taken as 10 to 15% of the compressive strength so only about 400 or 500 psi
·1 ½ This is commonly used as a base for roads slabs driveways walkways crushed stone patios interlocking walls and is also used for drainage stone projects septic systems and dry wells 2 ½ This is commonly used for larger construction jobs such as for road base tracking pads on job sites and for use with drainage
Why Do You Need Gravel Under a Concrete Gravel or crushed stone provides a stable surface for your concrete slab Even the most solid compacted soil can shift dramatically with the weather changes which will undermine your slab and cause cracks The job takes about an afternoon depending on the size of your slab and you ll find the
·The most commonly recommended gravel size for a concrete slab is ¾ inch crushed stone or gravel This size allows for proper drainage compaction and stability Smaller gravel like pea gravel doesn t provide adequate support
Crushed stone 2 inch size Stability drainage Patio 4 6 inches Crushed stone 1 inch size Level surface for pavers Slab foundation 6 12 inches Crushed stone 1 inch size Stability frost prevention Footing 12 18 inches Crushed stone 2 3 inch size Heavy load support
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