Milcor 3501-501-9 - 36 in. x 30 in. M-1 Galvanized Roof Hatch

The Milcor 3501-501-9 is a 36 inch by 30 inch single leaf roof hatch built with 14 gauge galvanized steel cover and curb, white powder coat finish. It includes a cover with 22 gauge galvanized steel liner bonded to a 1″ rigid styrofoam insulation core, and EPDM gasket adhered to the cover for weather tight seal. The curb is 14 gauge galvanized steel, 12″ high, with integral counterflashing, 3½″ mounting flanges, and 1″ fiberboard insulation. Cover lift is assisted by gas springs, with an integrated pintle hinge and slam latch with interior/exterior handles and padlock hasps. Hardware is zinc-plated with optional stainless steel. The unit meets a live load capacity of 70 psf.

Key Features:

• Single leaf design, opens easily to 90 degrees with gas spring lift assist
• Insulated cover & curb with rigid foam and fiberboard layers for thermal efficiency
• EPDM gasket and white powder coat finish for weather resistance
• Stainless optional hardware and zinc-plated standard hardware with padlock-capable slam latch
• Heavy gauge steel construction with integral counterflashing and pre-drilled mounting flanges

• Opening size: 36 inches × 30 inches
• Cover: 14 gauge galvanized steel exterior, 22 gauge liner, 1″ rigid styrofoam core insulation
• Curb: 14 gauge galvanized steel, 12″ height, integral counterflashing, 3½″ wide mounting flanges with pre-drilled holes, 1″ exterior fiberboard insulation
• Gasket: Extruded EPDM rubber adhered to cover
• Hinges: Integrated pintle hinge
• Lift Assist: Gas springs
• Latch: Slam latch with interior/exterior handles and padlock hasps
• Hardware: Zinc plated; stainless steel optional
• Load capacity: 70 psf

• Prepare opening in roof framing to 36″×30″, ensure curb structure support.
• Set the hatch onto curb with integral counterflashing; align mounting flanges.
• Secure hatch via mounting flanges using proper fasteners.
• Attach gas springs, install latch handles, ensure hinge and hardware are properly aligned.
• Test open/close action, verify gasket seal, confirm latch operation and load performance.

Q: What materials are used in 3501-501-9?
A: Cover and curb are 14 gauge galvanized steel; liner is 22 gauge galvanized steel; hardware is zinc plated (stainless optional).

Q: What insulation is included in the hatch?
A: Cover core uses 1″ rigid styrofoam insulation; curb includes 1″ fiberboard insulation.

Q: What is the live load rating?
A: Rated for 70 psf.

Q: Can this hatch be secured?
A: Yes, it uses a slam latch with interior and exterior handles plus padlock hasps.