• Prevent the contamination of the frost-resistant layer by the frost susceptible ground in place.
• Allows a better compaction and savings in materials of contribution.

Filtering and anticontaminant screen:

• Avoid the interpenetrating of the original ground with the aggregates.
• Completely preserve the properties of materials of contribution.
• Allows, in the course of execution of the building site, to circulate on the sub-base while it maintaining exempted of any contamination.