- Provides easy access to interior roof or floor hatch - Available 60° and 75° standard angles. Other angles and custom designs are available upon request. Provides easy ladder-to-roof access to a flat or low parapet roof - Lightweight and maintenance-free aluminum construction - Non-spark, high strength 6061-T6 alloy rungs and 6063-T5 alloy extrusions - Standard floor mounted bracket included. Options for seismic bracket also available - Comes with standard mill finish but can be anodized or powder coated to any color or finish specified for an additional cost - 30″ x 54″ roof hatch by O'Keeffe's also available