Compact grit

Loose scattered chippings must be compacted when exposed to traffic loads. On terrace floors, as a way fastening or on entrances and driveways, the compaction is essential to ensure sufficient stability and resilience.

Single or multiple compaction

The first decision criterion for the correct compacting of grit is the thickness of the grit layer. The thicker it is, the more thorough and frequent it must be condensed. Loose chippings are "soft" and the grains have little hold, which can lead to "churning" of the grit layer.

The nature of the subsoil should also be compacted, for example, if it is loose sand or topsoil. Imperfectly compacted layers in the construction of a traffic area can later cause the gravel to sink in "penetration".

The minimum thickness of the grit layer should be twice the height of the largest grain size contained. At an eight to 32 millimeter grit, that's 6.4 inches. If the fill of the chippings is to become higher or if gravel is inserted as a substructure, it should be compacted in layers at these height intervals.

This is how to compact chippings properly

  • Split with about ten percent reserve volume
  • Jogger or
  • Ram / Stampfer
  • Peel bar or pipe
  • Maybe rake

1. Fix the base

If necessary, compact a loose ground. Pay attention to a gradient of one to two percent, so that you can compress the chip layer later in a uniform thickness. The slope should not be generated by different thick gravel layers.

2. Pour up chippings

Pour out the dry grit and spread it so that it reaches the desired height. At higher altitudes, pour a first coat equal to twice the largest coarse grain size of the chippings.

3. Shake it off

Start with the rammer or the rammer to push the chippings. Try to make slight sideways movements as well. The grit must be "pulled together" in all directions. A mechanical vibrator automatically executes this motion combination.

4. Remove

After the first compaction, remove the grit with a bar or a pipe. If necessary, top up the next compaction layer until you have filled in the desired height.

Tips & Tricks

The corrective "adjustment" of individual uneven or tilted split grains, for example with a rake, can facilitate compacting.

Video Board: NEW - Grit by FEIN GKS75 Compact Belt Grinder