Bostik’s Ultra-Set SingleStep Adhesive see technical data sheet
Bostik’s Ultra-Set SingleStep wood flooring adhesive is a one-part, trowel applied, tacking, moisture-cure urethane adhesive, moisture vapor and round reduction membrane. This scientifically-formulated adhesive and membrane is very tenacious, has very low moisture permeability, and is formulated with patent pending Thickness-Control™ Spacer Technology to ensure proper membrane thickness between hardwood flooring and the substrate. Bostik’s Ultra-Set SingleStep does NOT contain any water, and has zero VOC as per SCAQMD 1168.
Directions for Use
Read and understand data sheet and material safety data sheet completely before beginning installation. Follow NWFA industry standards and wood flooring manufacturer’s recommendations for acclimation, design, layout and application of wood flooring material. If jobsite conditions are outside of wood flooring manufacturer’s recommendations, take necessary corrective actions.
To address current or possible future subfloor moisture, sound, and cracks (up to 1/8"), apply Ultra-Set SingleStep as directed.
Surfaces must be absorptive, clean, free from loose materials, oil, grease, sealers, curing compounds, waxes, silicates, laitance, and all other surface contaminants that may inhibit proper bond. Completely remove cutback adhesive residue or other surface contamintants by diamond grinding to open the pores of the concrete. All surfaces to be treated must have a concrete surface profile of CSP 2-3 (similar to a light broom finish), as define by ICRI (International Concrete Repair Institute, Guideline No. 03732). While there is no upper limit on the moisture vapor emission rate (and therefore anhydrous calcium chloride testing is not necessary) it is critical that the concrete be dry to the touch to properly bond. Maximum acceptable floor variation is 3/16" in 10 feet. Areas requiring patching or leveling must be done using a Portland cement-based material (e.g., Bostik UltraFinish™, Bostik Webcrete® 95 or Bostik SL-150™ Self-Leveling Underlayment).