Therma-kerbs Thermadome kerbs are designed to be used in conjunction with Thermadome rooflights and are finished in white internally. Therma-kerbs represent excellent value for money and will enhance the overall appearance of the rooflight. The heights of Therma-kerbs are 150 mm, 300 mm and 500 mm.
The standard Therma-kerb is made from extruded white PVC-u. The multi-chambered construction gives an exceptionally robust and thermally efficient performance. This kerb is suitable for most roof finishes.
Therma-kerbs can also be supplied in GRP which have integral 10 mm polyurethane foam insulation and robust dome fixing and mounting flanges. It can be used with any roofing material.
Special GRP versions are also available 150, 300 and 500 mm high. These have 20 mm of integral insulation.

Alu-kerbs are purpose made to fit nonstandard roof openings. Alu-kerbs are fabricated from mill finished aluminium in an all-welded construction and supplied with a white foamed PVC-u insulating lining as standard. If required, additional insulation can be applied externally prior to waterproofing.

Alu-kerb adaptors, collars and flanges enable standard sized Thermadomes to be fitted where a direct size match is not available. They are purpose made to fit any size or type of existing builder’s kerb or proprietary upstand.

Access hatches

Where the rooflight is to be used as means of access on to a roof, a fully opening frame can be specified for mounting either direct to a builders kerb or in conjunction with Therma-kerb or Alu-kerb adaptors.
PVC-u frames are for use with Therma-kerb and Alu-kerb upstands. Aluminium frames are for use with builders kerbs.

Standard features include a locking handle to secure the rooflight in the closed position and telescopic struts to hold the rooflight in the open position. The telescopic struts have adjustable friction control and can be set according to the dome weight and prevailing site conditions. The hatch can be supplied with Thermadome thermoformed polycarbonate glazing or an insulated aluminium cover.

Therma-hatch - PVC-u frame mounted to a Therma-kerb

Therma-hatch - Aluminium frame mounted to a builders kerb

If you would like assistance at any time about any of the rooflights or would like further details of our range, then please do not hesitate to contact us on
01276 451555, e-mail us at info@nationaldomes.com or use this e-mail form
to contact us.