Bilco - Model Type NB -Roof Hatch-Ship Stair Access

Roof Hatch Models

Type NB-20, NB-40, NB-50, NB-20HZ, NB-50HZ, NB-90

• Miami-Dade County and Florida Building Commission approval for use in high velocity hurricane zones with large and small missile impact.*
• 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
• 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
• Available in many sizes and curb configurations to satisfy any requirement or installation

• Material (select one): 
  • Steel: Cover and frame are 14 gauge (2 mm) galvannealed steel.
  • Aluminum: Cover and frame are 11 gauge (2.3 mm) aluminum. 
  • Stainless Steel: Cover and frame are 14 gauge (2 mm) type 304 stainless steel
• Cover: Brakeformed, hollow-metal design with 1" (25 mm) concealed fiberglass insulation, 3" (76 mm) beaded, overlapping flange, fully welded at corners, and internally reinforced for 40 psf (195 kg/m2) live load.
• 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. (For Type NB-20HZ and NB-50HZ Miami-Dade County approved models: Specify enclosed two-point spring 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: 
  • Steel: Alkyd base red oxide primer. 
  • Aluminum: Mill Finish. 
  • Stainless Steel: Type 304 stainless steel with mill finish and electrochemical passivation of welds.
• Hardware:
  • Steel: All hardware is zinc plated/chromate sealed. 
  • Aluminum: Type 316 Stainless steel hinges. All other hardware is zinc plated/chromate sealed. 
  • Stainless Steel: Type 316 stainless steel.