Roof hatches in special sizes are, like other RHT roof hatches, made of light-weight aluminium and have a fully thermally broken curb and cover, and a proven high insulation value; Uw ≤ 0,319 W/(m².K).



The roof hatches provide a practical and safe access to flat roofs for maintenance work, but can also be used as a hatch for hoisting materials into the building. The roof hatches can be installed on flat roofs with a maximum slope of 30°.


Dimensions and versions

With customised roof hatches, the longest side of the curb is always the hinged side. The following applies in respect of the sizes: 

  • special sizes larger than 1150 x 4500 mm are supplied with 2 covers as an RHTD roof hatch.
  • Sizes larger than 1500 mm are fitted with a three-point Euro cylinder lock.
  • Sizes larger than 2500 mm are supplied with a two-point locking mechanism and provision for a padlock. They cannot be opened from the outside.
  • Sizes larger than 3000 mm are supplied as standard with an electric controller type TIM35.


Customised Gorter RHT roof hatch:

  • TÜV NORD, Aboma and KOMO® certified
  • Fully thermally broken curb and cover
  • Safe to operate with one hand or electric controller
  • 10-year guarantee
  • High-quality construction
  • Burglar- and sound-proof


Read more about the advantages of Gorter roof hatches here