Washed product with little to no dust fractions. HPB (TM) is ONLY available at tested and approved Dufferin Aggregates sources. Approved under the Building Materials Evaluation Commission for use beneath floors, top and sides of drain pipes and tile as required under 1997 Ontario Building Code.
Used as a ground levelling material or drainage stone. Typically placed behind retaining walls, under floors, in and around pipes or drain tile for sewer and water main applications.