UNSPSC 12164802: Water swelling or water stop agent

A chemical product that expands or swells upon contact with water, thereby sealing off water from the materials it is applied to.

UNSPSC 12164802 Water swelling or water stop agent is a Commodity code that covers chemical sealants, waterproofing compounds, and hydrophilic products used to prevent water infiltration and control moisture migration in building envelopes and masonry structures. State and local governments procure these materials as components of facility maintenance, repair, and restoration work—particularly in masonry waterproofing, concrete sealing, and water treatment applications. Recent solicitations show the code embedded within larger facility restoration and water infrastructure projects rather than as standalone material purchases; waterproofing agents appear as line items within comprehensive masonry repair, facilities maintenance, or water treatment equipment contracts. Issuing bodies include universities with substantial facilities portfolios, municipal water districts, and city governments managing public facilities. The University of Texas at Arlington and West Basin Municipal Water District represent the primary recent buyers, with work scopes spanning institutional campus maintenance and municipal water treatment infrastructure.

Activity concentrates in Texas and California, with secondary representation in Georgia and Wisconsin. The University of Texas at Arlington issued an RFP in May 2026 (due April 30, 2026, now closed) for an indefinite-quantity blanket order covering masonry restoration, brick repair, and facilities waterproofing services across campus, with unit pricing required for over 100 work categories including sealants and coatings and a potential six-year contract value of approximately $600,000. West Basin Municipal Water District issued an IFB in May 2026 for the Title 22 Filters 1, 5, and 10 Rehabilitation and Replacement Project, a capital improvement that includes water treatment equipment and system rehabilitation work requiring compliance with California water treatment standards and American Water Works Association specifications. The City of Tybee Island, Georgia issued an ITB in April 2026 (due May 19, 2026) for a new masonry restroom facility with exterior wood horizontal boards over black waterproofing and a standing seam metal roof. These opportunities show waterproofing materials and sealants as embedded procurement components rather than primary product lines, reflecting how state and local agencies typically source them through facility construction and maintenance contracts rather than direct material purchases.