SSY-50TB service stair hatches are designed to be used for access on a flat roof where a fixed stairway is available. They are 760 x 3360mm in size, which provides additional headroom for applications with more gradual stairs.
They feature a thermally broken frame and cover design that minimises heat transfer between interior and exterior metal surfaces and provides a high degree of thermal efficiency. There is 75mm of polyisocyanurate insulation to both the upstand and the cover.
In addition, the cover is fitted with a closed-cell EPDM gasket designed to reduce the air leakage though the closed cover, ensuring that the air leakage requirements of Building Regulations Part L are achieved.