Type D Roof Hatch Models

Type D-20, D-40, D-50, D-90

Standard Features and Benefits

• Engineered with compression spring operators to provide smooth, easy, one-hand operation, regardless of size
• Automatic hold-open arms lock the covers in the open position to ensure safe egress
• Overlapping cover design, full welded corners on covers 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

Guide Specifications

• Material (select one):
  • Steel: Covers and frame are 14 gauge (2mm) G-90 paint bond galvanized steel. 
  • Aluminum: Covers and frame are 11 gauge (2.3mm) aluminum. 
  • Stainless Steel: Covers and frame are 14 gauge (2mm) type 304 stainless steel.
• Covers: Brakeformed, hollow-metal design with 1" (25mm) concealed fiberglass insulation, 3" (76mm) beaded, overlapping flange, fully welded at corners, and internally reinforced for 40 psf (195 kg/m2) live load.
• Curb: 12" (305mm) in height with integral capflashing, 1" (25mm) fiberboard insulation, fully welded at corners, and 3-1/2" (89mm) mounting flange with 7/16" holes (11mm) 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" (9mm) type 316 stainless steel hinge pins.
• Latch: 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: Engineered composite compression spring tubes with steel compression springs packed in grease. All other hardware is zinc plated/chromate sealed. 
  • Aluminum: Engineered composite compression spring tubes. Steel compression springs with electrocoated acrylic finish. Type 316 Stainless steel hinges. All other hardware is zinc plated/chromate sealed. 
  • Stainless Steel: Type 316 stainless steel.

U.S. Patents  5,960,596  6,347,818 

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CA Prop 65 Notice

WARNING : The State of California has deemed that this product can cause cancer, birth defects or other harmful effects. For more information, please visit For more information, Please visit: www.p65warnings.ca.gov/