2A Limestone for driveway

/ 2A Limestone for driveway #21  
Make sure that your road is elevated with good drainage before spending money on rock.

Limestone is a soft rock that wears fairly quickly. I'm not familiar with the "2A" label. Here it's called "Road Base" or "Cliche" It's crushed rock with jagged edges in all sizes from two inches down to fines. The different sizes lock together to form a solid surface that will shed water when it's 4 inches thick or thicker. Big mistake people make is not installing it thick enough to lock together.

Slag is one of the worse materials that I've ever seen used for roads and parking areas. It does not lock together; it sticks to your shoes and then ends up all over your floors. And worse thing about is that it's so soft it just wears away quickly.

Used Asphalt might be OK over a solid rock base if it's thick enough and rolled to compaction. It has no strength, it does not lock together and it fails very quickly. To use it when make a road, hot oil blended specifically for roads needs to be mixed with it, and then rolled.

Crushed Concrete is what I've been buying and my favorite material by far. It's super hard, it compacts into a solid surface quickly and easily. You can get by with less then 4 inches depending on your soil. And once it's in place, it never seems to break down or wear away. The big negative to it depends on the plant it comes from and how clean it gets there. A lot of the time you'll find plastic and small pieces of rebar in it. After spreading it, you need to walk the area and pick up the trash that came with the load.
 
/ 2A Limestone for driveway #22  
Make sure that your road is elevated with good drainage before spending money on rock.

Limestone is a soft rock that wears fairly quickly. I'm not familiar with the "2A" label. Here it's called "Road Base" or "Cliche" It's crushed rock with jagged edges in all sizes from two inches down to fines. The different sizes lock together to form a solid surface that will shed water when it's 4 inches thick or thicker. Big mistake people make is not installing it thick enough to lock together.

Crushed Concrete is what I've been buying and my favorite material by far. It's super hard, it compacts into a solid surface quickly and easily. You can get by with less then 4 inches depending on your soil. And once it's in place, it never seems to break down or wear away. The big negative to it depends on the plant it comes from and how clean it gets there. A lot of the time you'll find plastic and small pieces of rebar in it. After spreading it, you need to walk the area and pick up the trash that came with the load.
Great point about elevation and drainage - much more important than actual surface material. All material choices can result in a failed driveway if your road is a trench holding water.

I built most of my driveway base using crushed concrete chunks up to 3" max size and it has held up tremendously well (over a sandy base soil, also helpful).

2A limestone is 1-2" max down to fines. Also called "57" in many places.

My landscape stores around here just call the limestone/gravel by the size of the rock, IE I tend to order " 3/4 minus " meaning 0.75 inches and smaller.

2B is clean, washed limestone (my preference, fines definitely lock things together but I absolutely hate the mess).
 

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