how much gravel under garage slab

… Planning to use 2" reclaimed XPS under garage floor which is on high ground with sandy soil.



I have been trying to find such a material here in Boise, ID and need some advice. Posted on: November 22, 2017.

If gravel should be above sand, how much? you shouldn't build a slab on grass for starters, cause it can decompose and change the surface level eventuating to a cracked slab, so either dig up the grass to lay slab on solid ground, or lay gravel/sand and compact it to achieve solid ground.

Slab Detail Northern Climates Recommend Gravel Clified Fill.

Far more important than bearing capacity is the base’s ability to provide consistent support. I am currently in the midst of a 30x40 garage construction. In zone 5 SW MI.

Its about 3.75 cu yards of crete, or like $400 It will cost $100 for gravel to fill in 2", but my crete is still only a little cheaper, and it will be a thinner slab. I am pouring a 5" slab over 4" of compacted gravel.


Subgrades and Subbases for Slabs Site Prep. How To Build Patios Walkways. By Bill Palmer. I could put gravel in, say 2" and 3.5" of concrete over that or just full 5.5" of crete or I could do lot of gravel and a 2" top coat over that with a bunch of steel and fibers, Water leak under a concrete slab building a greenhouse foundation concrete form and pouring a slab how to build patios walkways under slab vapor barrier americover under slab vapor barrier americover. Wacker Neuson The key to a good slab is a well-compacted subgrade and subbase. I've seen that gravel is generally recommended under basement floors, but haven't yet been able to locate an article discussing garage floors. Slabs & Floors Subgrades and Subbases for Slabs The right materials and techniques provide a solid foundation.

Re: How much gravel under concrete? That means that the soil under a typical garage slab only has to be able to support 125 psf. The next morning it was hard and very firm. Thanks! Excavator and builder say that floor should be sand, XPS, poly then concrete.

As for ground material, sand is generally for volcanic or earthquake areas due to its ability to move with the ground and stay the same shape as your slab.

I had used as fill under Pavers using A mix of gravel chips of various sizes but small 1/4" irregular some call it slab fill.

I wetted it down and compacted it. What Type Of Gravel Under Concrete Slab.

What I did was to peel off the sod and put in about 40 yds of sand to level the pad above ground level for drainage.

My 24 X 28 garage in Vt. is almost done. The problem is, I don't know how much 4" of compacted gravel is when it comes to buying the stuff.

What Is The Best Way To Fill A 3 Inch Gap Under My … Place a concrete floor on an unstable subgrade or subbase and you’ll probably pay for it two ways.
If one part settles more than another, the slab will bend and potentially crack.
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