Milcor Aluminum Single Leaf Roof Hatch

Milcor roof hatches deliver durable rooftop access with insulated cover and curb assemblies, weather-resistant EPDM gasketing, and spring-assisted operation for safe, one-hand use. Models in this group cover common ladder or service access openings and are available in aluminum or galvanized steel with robust hinges, slam latches with padlock provisions, and hold-open arms for safety.

Key Features:

• Aluminum or galvanized steel construction with insulated cover and curb

• EPDM perimeter gasket and welded corners for weather tightness

• Spring-assisted opening (torsion or gas springs) and automatic hold-open arm

• Slam latch with interior and exterior handles; padlock hasps included

• Typical live load ratings of 40 psf or 70 psf depending on model

• 3501-132-9 (RD-1, aluminum)
  • Opening size: 36 in × 30 in
  • Curb height: 12 in
  • Insulation: 1 in rigid insulation (cover and curb)
  • Live load: 70 psf
  • Operation: torsion spring lift assist; hold-open arm; slam latch; EPDM gasket
• 3501-710-9 (RD-3x3, aluminum)
  • Opening size: 36 in × 36 in
  • Curb height: 12 in
  • Insulation: 1 in rigid or fiberglass insulation (cover and curb)
  • Live load: 40 psf
  • Operation: torsion spring lift assist; hold-open arm; slam latch; EPDM gasket
• 3501-135-9 (galvanized steel)
  • Opening size: 30 in × 54 in
  • Curb height: 12 in
  • Insulation: 1 in rigid insulation (cover and curb)
  • Live load: 70 psf
  • Operation: spring-assisted cover; hold-open arm; slam latch; EPDM gasket
• 3501-306-9 (galvanized steel)
  • Opening size: 48 in × 48 in
  • Curb height: 12 in
  • Insulation: 1 in rigid insulation (cover and curb)
  • Live load: 40 psf
  • Operation: spring-assisted cover; hold-open arm; slam latch; EPDM gasket
• 3501-138-9 (galvanized steel)
  • Opening size: 30 in × 96 in
  • Curb height: 12 in
  • Insulation: 1 in rigid insulation (cover and curb)
  • Live load: 40 psf
  • Operation: spring-assisted cover; hold-open arm; slam latch; EPDM gasket

• Verify roof opening matches the selected model’s clear opening size and ensure structural curb support.
• Set the hatch curb over the opening, square and level, with mounting flanges fully supported.
• Fasten through pre-drilled flange holes with appropriate roof-deck fasteners and seal per roofing practice.
• Attach and adjust spring hardware, hinges, latch, and hold-open arm according to manufacturer instructions.
• Test opening and closing, confirm latch engagement, and verify continuous gasket seal.

Q: What insulation is used in these roof hatches?
A: Models use approximately 1 inch rigid or fiberglass insulation in the cover and matching insulation in the curb for thermal performance.

Q: Are these hatches suitable for frequent access?
A: Yes. Spring-assisted mechanisms and an automatic hold-open arm support routine rooftop entry and maintenance.

Q: What are the typical load ratings?
A: Depending on the model, live load ratings are 40 psf or 70 psf; see specifications under each SKU.

Q: Can these hatches be secured with a padlock?
A: Yes. Each model includes a slam latch with interior/exterior handles and padlock hasps.