Granular M or ⅝” minus is the product of choice for driveways, laneways and parking areas and our best seller. It has the right blend of crushed fines with a coarse aggregate that compacts and binds together. Granular A can also be used but is recommended for higher-traffic municipal roads. Granular A is a ⅞” minus product with larger particles that have a tendency to roll to the surface and do not mesh and pack as well as the finer Granular M. This results in issues with snow blowing and snow ploughing and is less desirable to walk on.
Paving Stones are a manufactured concrete product and therefore have a very accurate thickness tolerance, allowing for the base layer to be accurately levelled and compacted. Therefore, Granite Screenings are easy to ‘screed’ into a smooth compacted layer and are recommended as the under layer for paving stones.
We find all landscapers have their own preferred products and methods. The following is the rationale we use as we are asked this question a lot. On our projects, we typically use ½” clear below a flagstone patio, we do this for a few reasons: 1.) Clear stone does not require compaction and cut flagstone is not always a perfect thickness, and therefore, it normally requires some minor adjustments to the granular layer. Levelling with screenings or Granular M means if the top material is loose, it could compact and result in minor settling. Using clear stone, we find we can set the flagstone with less risk of future settling. 2.) the clear stone offers a drainage layer. 3.) ½” clear is easier to grade and work with than a larger diameter stone below a patio. However, for stair treads, a larger diameter stone is recommended depending on conditions. Drainage is a very important aspect of setting stair treads. If the area is susceptible to water, use larger stone, it will allow for water to flow. We have seen stair treads wash out because of a too-small drainage stone used.
All of our quarries are predominantly dark grey in colour. Some quarries have different tones of greys and colours of reds and pinks blended in. The very trained eye can spot a difference but they are all very similar in appearance after application. We do not manufacture or inventory 100% pink granite.
All of our crushed stone products are Granite and manufactured at our local quarries. Granite is a superior product to Limestone. Limestone will breakdown quicker over time, will create a slimy surface when wet and will track into a house. Granite products will not breakdown, go slimy or track as easily.