Bilco GS-50TB - Thermally Broken Aluminum Roof Hatch, 36" x 30"

The Bilco GS-50TB is a 36-inch by 30-inch thermally broken roof hatch designed for ladder access. It is built with an aluminum cover and curb, a clear polycarbonate dome, and an overlapping flange for weather tightness. Both the cover and curb are insulated with R-18 polyisocyanurate. The hatch features compression spring operators inside telescopic tubes, a stainless steel pintle hinge, a slam latch with interior and exterior handles, padlock hasps, and an automatic hold-open arm for safe operation. Its thermally broken design minimizes heat transfer and condensation, making it suitable for energy-efficient applications.

Key Features:

• Thermally broken frame and cover to reduce heat transfer and condensation
• Clear polycarbonate dome for natural daylight access
• R-18 polyisocyanurate insulation in both cover and curb
• Overlapping flange and fully welded corners for a weather-tight seal
• Heavy-duty stainless steel hardware, compression springs, and automatic hold-open arm
• Ladder access design with secure latch and safety hardware

• Width × Length (curb-to-curb): 36″ × 30″ (914 mm × 762 mm)
• Material: 11 gauge aluminum cover and frame with R-18 insulation
• Dome: Clear polycarbonate dome
• Curb height: 12″ (305 mm) with integral cap flashing; mounting flange with pre-drilled holes
• Live load capacity: 40 psf (195 kg/m²)
• Finish: Mill aluminum, safety hardware stainless or zinc-plated where applicable
• Includes: Insulated aluminum cover and curb, polycarbonate dome, stainless steel hardware, slam latch, padlock hasps, compression springs, automatic hold-open arm

• Prepare a 36″ × 30″ roof opening with structural support and curb in place.
• Position the GS-50TB over the opening and align the mounting flange holes.
• Secure the hatch to the roof deck with appropriate fasteners.
• Attach hinges, spring operators, latch hardware, and hold-open arm.
• Test the hatch for smooth operation, tight gasket seal, and proper latch engagement.

Q: What is the insulation rating of the GS-50TB?
A: Approximately R-18, using polyisocyanurate insulation in both cover and curb.

Q: Does the GS-50TB allow natural daylight inside?
A: Yes. The clear polycarbonate dome provides natural lighting while maintaining weather resistance.

Q: Is the hatch designed for ladder access?
A: Yes. The GS-50TB is a ladder access hatch with durable hardware for frequent use.

Q: What live load capacity does the hatch support?
A: The cover is designed to support up to 40 psf live load.