Prices are subject to change.

Bilco GS Roof Hatch and Skylight #


Type GS, 36″ x 30″ (914mm x 762mm), and Type GSS (Special Size) roof hatches provide all the security and convenience of a BILCO roof hatch with the added benefits of a skylight. Products feature a polycarbonate dome cover, aluminum construction, and easy one-hand operation. Type GSS and type GS roof hatch products are available in all standard roof hatch sizes and custom sizes can be supplied when specified.

Roof Hatch Models

Type GS-50, GSS-50 (special size)

Standard Features and Benefits

  • Engineered with compression spring operators to provide smooth, easy, one-hand operation, regardless of size
  • Automatic hold-open arm locks the cover in the open position to ensure safe egress
  • Overlapping cover design, full welded corners on cover and curb, EPDM rubber gasket, and fully insulated cover and curb ensure weathertightness and energy efficiency
  • Covers are designed with a perimeter channel and weep holes to catch and drain normal condensation. Double domes are available for added cover insulation.*
  • Constructed with corrosion resistant materials to provide many years of trouble free, dependable service
  • Heavy gauge construction and positive latching mechanism maintain building security
  • Curb features the Bil-Clip® flashing system, an innovative method to quickly and easily secure single-ply roofing material to BILCO roof products
  • Type GS roof hatch and type GSS roof hatch are available in many sizes and curb configurations to satisfy any requirement or installation


*Please consult BILCO for residential applications or for installation on buildings with severe differences in indoor and outdoor temperatures.


Guide Specifications

  • Material: Cover and frame are 11 gauge (2.3 mm) aluminum.
  • Cover: Aluminum extrusion with built-in condensation drainage channel and clear polycarbonate dome or double domes. Dome(s) is coated for UV-resistance.
  • Curb: 12″ (305 mm) in height with integral capflashing, 1″ (25 mm) fiberboard insulation, fully welded at corners, and 3-1/2″ (89 mm) mounting flange with 7/16″ holes (11 mm) provided for securing frame to the roof deck.
  • Gasket: Extruded EPDM rubber gasket permanently adhered to cover.
  • Hinges: Heavy-duty pintle hinges with 3/8″ (9 mm) Type 316 stainless steel hinge pins.
  • Latch: Slam latch with interior and exterior turn handles and padlock hasps.
  • Lift Assistance: Compression spring operators enclosed in telescopic tubes. Automatic hold-open arm with grip handle release.
  • Finish: Mill finish aluminum.
  • Hardware: Type 316 Stainless steel hinges. All other hardware is zinc plated/chromate sealed.