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Avoid stone dust or limestone screenings, as these materials usually have too many fines (dust) that trap water that can cause early failure of the pavers. Sand is often used. Instead of sand, you can also use a small chip stone called "ASTM #9s," "HPB" or "clear 1/8″ chip."
Also called rock dust, stone dust is more prone than sand to settling and drainage problems when used as a base beneath walkway or patio pavers. Stone dust has a powdery texture because it results from stones being crushed.
The method is much different in the frozen north than the sunny south. I do not like crushed stone with a gravel overcoat. the sand will eventually settle into the stone and leave voids under the pavers.. I am a firm believer in stone dust. 3/8 stone dust, wetted and compacted is like a concrete base.
When comparing stone dust vs sand, this sand is definitely an acceptable material to use under pavers. It provides drainage, wont eat away at the pavers, and it compacts well. With the compaction of the pavers, the sand will work its way into the joints of the pavers from below creating that interlock that is required in an interlocking system.
Tip: Crusher dust and mixing sand with cement are not recommended. 6. Laying the Pavers Setting out - The best way to ensure ... rubber mat under the compactor to prevent the pavers from being scratched or damaged. After each pass of the compactor sweep in more jointing sand and
Not all kinds of stone dust are poor choices for pavers, however. Crusher run, also called processed gravel, is a rock or stone dust made of particles about the size of a grain of sand.
The sand - "concrete sand" is where the interlock takes place - it comes up and fills the joints causing them to lock up. Stone dust will only get hard "under" the pavers and actually hold water, which is another issue. Use concrete sand and only 3/4" under the pavers. Just make sure the base is deep enough and compacted.
Once you have laid your pavers neatly on top of your compacted material, whether it is sand or crusher dust, we recommend you go over the top of your pavers once more with a small compaction plate. To prevent damage to your pavers, use a piece of rubber or use a compaction plate with a heavy duty rubber mat attached to the bottom.
Add a layer of bedding sand. Pour a layer of coarse sand into the pit, filling it between 1 to 1.5 inches (2.5 to 3.8 cm) deep. Avoid fine sand and combination mixes cut with limestone or stone dust. The sand will help the pavers lock together, making sure they set properly.
I recently installed a paver patio (tumbled pavers) and am almost done, just need to fill the joints and compact with the plate compactor. I am stuck on this part because I am confused as to whether I should use stone dust or sand (and what kind of sand) in between the joints. I have done several searches and can't seem to get the answer I need.
crusher dust vs roadbase. I want to lay pavers on a 10sqm path near the house. I already excavated the area (clay, "M" class) and leveled it. My original plan was to lay 10cm roadbase + 4-5 cm bedding sand. However, a local supplier advised me to use blue metal crusher dust all the way through and lay the pavers just on top.
To achieve a firm base from the beginning, you need to make sure you have the correct depth of sand under pavers. We recommend allowing for a depth of at least 30mm loose sand. This will pack down to about 20-25mm depending on the method you use for packing and will allow for drainage without your pavers shifting.
Best Stone Dust Not all kinds of stone dust are poor choices for pavers, however. It is coarse, rather than powdery, giving it properties that make it superior to regular stone dust. Crusher run is a highly compacting, well-draining material that is second only to sand as a base for pavers.