A surface treatment that consists of the application of asphalt emulsion and a large aggregate, followed by a second application of asphalt emulsion that is in turn covered with smaller aggregate and compacted. Sandwich seals are used to seal the surface and improve skid resistance, especially on asphalt pavement surfaces that are bleeding or flushing.

Combination or specialty application.

CHFRS-2HP, CHFRS-2P
CMS-1P (CR)
CRS-1P
CRS-2, CRS-2H, CRS-2HLM, CRS-2HP, CRS-2L, CRS-2P
HFRS-2, HFRS-2P
RS-2

| Agg Mix | Blade Mix | Cape Seal | Chip Seal multiple | Chip Seal single | Cold In-Place Recycling | Cold Patch | Dust Palliative | Fog Seal | Full Depth Reclamation | Hot In-Place Recycling | Micro Surfacing | Mulch Treatment | Penetrating Prime | Recycle Mix | Rejuvenating Chip Seal | Rejuvenating Fog Seal | Rejuvenation | Sand Seal | Sandwich Seal | Scrub Seal | Slurry Seal | Tack Coat | Ultra-Thin Bonded Wearing Course | Warm Mix Cold Lay |