Watertight, resilient, system for below-grade and foundation expansion joints installed from the positive side. Permanently elastic, high-density, cellular polyurethane foam, impregnated with water-based, polymer-modified asphalt, compressed to approximately 20% of its uncompressed dimension.
Supplied pre-compressed to smaller than mean joint size; installed flush with, or near to surface into wet epoxy adhesive, the material expands to seal the joint.
Exposed top surface is treated with Topcoat flexible coating to enhance sealing and durability.
The 20H SYSTEM is installed from the positive side of the retaining wall into a pre-formed joint opening in cured concrete. The joint opening would be formed with extruded polystyrene that is stripped out from between the cured joint faces deep enough to receive the 20H foam (3-inches for 2-inch nominal 20H for example).
The 20H SYSTEM is installed flush to the face of the positive side of the wall. The the below-grade waterproofing membrane and drainage board are installed over the 20H SYSTEM using the membrane manufacturers standard inverted, slip-sheet, detail.
