For further details about products & installation, please refer to the section: Xypex FAQ


  1. Is there a preference when choosing between the positive or negative side? READ
    Generally, it is recommended that the Xypex coating be applied to the positive side (water side), if accessible, so as to ensure maximum benefit. Therefore, new construction specifications almost always call for the use of the Xypex coating on the positive side (water side). If, however, the positive side is not accessible e.g. tunneling projects or rehabilitation of existing structures, the Xypex coating will be specified for use on the negative side against the hydrostatic pressure.

  2. How is Xypex different from other products? READ
    The Xypex crystalline system for concrete waterproofing and protection is substantially different from traditional barrier products (membranes, cementitious coatings, etc): 

    • Xypex creates a crystalline structure deep within the pores and capillary tracts of the concrete mass to prevent the penetration of water and aggressive chemicals. In contrast, barrier type products function only at the surface of concrete.
    • Because Xypex is not dependent on surface adhesion to achieve its waterproofing effect, it is resistant to extreme hydrostatic pressure.
    • Xypex will seal hairline cracks up to 0.4 mm (1/64”).
    • Xypex is not subject to the deterioration problems encountered by membranes.
    • Xypex is designed to be permanent and reactivates whenever water is present. 
  3. Is the Xypex coating suitable for use on surfaces other than concrete? READ
    Xypex is totally compatible with the chemistry of concrete, whether poured-in-place, pre-cast or shotcrete. It is not suitable for application to cut-limestone, clay brick, wood, metals, asphalt or other non-concrete building materials.

  4. What are some typical Xypex applications? READ
    Typical Xypex applications include:

    • reservoirs 
    • sewage and water treatment tanks 
    • secondary containment structures
    • tunnels
    • underground vaults
    • manholes
    • concrete pipe
    • foundations pools
    • parking structures
    • below grade construction

  5. Can the Xypex coating be applied while the concrete is wet? READ
    Yes. In fact, the concrete must be wet or moist before applying the Xypex slurry coat. Xypex requires moisture to generate the crystalline growth in concrete. The presence of moisture is also necessary to ensure proper bonding of the slurry coat to the concrete substrate.

  6. How long does Xypex last? READ
    The Xypex treatment, unlike most other systems, becomes a permanent part of the concrete matrix. Its unique dendritic crystalline growth will not deteriorate under normal conditions, and the crystalline process will reactivate whenever water is present.

  7. Can the Xypex coating be applied to the negative side of a structure? READ
    Yes. Although applied as a coating, Xypex is not relying on its surface bonding capability to achieve its waterproofing effect. By means of diffusion, the reactive chemicals in the Xypex coating migrate through the capillary tracts within the concrete to become an integral part of the concrete mass. Therefore, the Xypex coating can be applied to either the positive (water side) or negative side even against strong hydrostatic pressure.

  8. What are the key benefits of Xypex for Contractors? READ

    • Step-by-step application instructions
    • Enhance jobsite productivity
    • Save time, build faster
    • Reduce labor and workmanship issues

    Xypex has many advantages over traditional barrier and membrane systems plus Xypex Crystalline Technology is unique. You will find superior product and application flexibility. As a coating, dry-shake or admix; brushed on, poured-in-place, shotcrete or precast, or concrete repairs – Xypex is easy to use. Using Xypex ensures satisfaction in what you are doing – confidence in every job.

  9. Can paint and other finishing materials be applied over a Xypex coating? READ
    Yes. In most circumstances paint, epoxy coatings, cement parge coats, plaster and stucco can be applied over a Xypex coating. For further information concerning the interface of the Xypex coating with paint and other finishing materials, consult with a Xypex Technical Services Representative.
  10. How is the Xypex coating system different from other cementitious coatings? READ
    Most cementitious coatings are simply surface treatments and are totally dependent on maintaining a proper bond to the concrete surface. Such coatings usually incorporate a latex modifier which makes the coating less permeable and acts as a bonding agent for better adhesion to the surface. They are surface treatments only, and have the added disadvantage of limiting breathability of the concrete. They do not form crystals within the concrete substrate (contrary to what is sometimes represented) and are not effective when applied against hydrostatic pressure.