Single-layer, Staycell ONE STEP® 255 (Monolithic System)
Staycell ONE STEP® 255 is an intumescent, closed-cell, spray polyurethane foam typically specified up to a two-inch thickness for air sealing and insulating walls, metal siding, structural steel and the underside of roofs and concrete slabs.
This product has Class A flame spread and smoke development ratings and is qualified as an AlternativeThermal Barrier Assembly when installed exposed without gypsum board or other fire-protective coverings in accordance with QAI Evaluation Report No. B1020-1, Edition 6.