Aluminum Thermally Broken Curb Mounted (ATCM-P) – Operable Electric Spindle Pyramid

This model consists of a durable, weather resistant, extruded aluminum retaining frame and an extruded thermally broken aluminum heliarc welded base frame. The aluminum base frame is thermally broken, preventing the passage of cold air from the exterior to the interior light shaft. This model is typically used for larger skylights that require additional strength and rigidity.

The ATCM-P operable skylight is hinged directly to the curb and does not include a two part sash and base. The entire skylight lifts off the curb and is sealed to the curb with a high density foam gasket when closed. This skylight does not include a screen and is primarily used for venting commercial applications.

The Columbia aluminum thermally broken curb mounted skylight is designed to work on any height curb with a nominal 2” width.

Electric spindle operating mechanism»

Wide range of glazing options in acrylic and polycarbonate»

Suitable for all flat or sloped roof applications»

Standard sizes include a full range of models for homes designed with 16” and 24” on centre rafters or trusses.»

Any size skylight available»

Exterior frame finishes – four standard colours»

Flashing system»

Large capacity four sided condensation channel»


  • The ATCM–E skylight consists of an electric actuator (motor) connected to the skylight and mounts to your curb.
  • Must be installed by a certified electrician and requires a 110V power source.
  • Includes a three position toggle switch for opening, stationary, and closing positions.

a. Acrylic

  • Clear
  • Bronze
  • White

All above available in single, double, or triple glazed.

b. Polycarbonate

  • Clear
  • Bronze
  • White

All above available in single, double, or triple glazed.

See Glazing section for additional information.

  • Acrylic – Installs on flat or sloped roofs
  • Polycarbonate – Installs on flat or sloped roofs.

See Roof types and slopes section for additional information.

See Why Skylights – What Size section for additional information.

  • Acrylic and polycarbonate available in 11 standard sizes from 16” x 16” to 96” x 96”.
  • For skylights larger than 72” x 72” a double electric spindle operator is required.
  • Any custom size in acrylic also available. Example – inside curb rough opening 67¾” x 67¾”.

  • Standard frame colour – Rideau Brown
  • Optional frame colours – Black, White, Sandalwood
  • Custom coloured frames also available

  • Flashing kits available for sloped applications only
  • Suitable for shingles and other low profile roofing materials
  • Use in conjunction with roofing membrane for superior seal
  • Custom flashings are required for flat roofs and other roofing materials

  • Weep holes in all four corners to allow any condensation build up to drain to the outside roof
  • Allows for multi directional installation of skylight. Direction must be specified when ordering.
  • Eliminates water stains on your interior light shaft

  • Comprehensive 10 year warranty on the skylight

See Warranty section for additional information.