Two-layer, Staycell® 265 / Staycell ONE STEP® (Hybrid System)
The Hybrid System consists of two separate layers of closed-cell foam: Staycell® 265 as the base layer covered with Staycell ONE STEP® 255 intumescent foam as the exposed surface layer. It is typically specified at greater than a two-inch thickness for insulating walls, metal siding and the underside of roofs and concrete slabs.
This System has Class A flame spread and smoke development ratings and is qualified as an Alternative Thermal Barrier Assembly when installed exposed without gypsum board or other fire-protective coverings in accordance with QAI Evaluation Report No. B1020-1, Edition 6.