PVC Skylights with flat double glazed glass units are available in in two different kerb options and a  variety of fixed and hinged ventilation options.

Ventilation Options The ventilation frame is constructed from a single, highly complex, PVC profile designed to efficiently 'dock' between the glazing module and either the kerb adaptor profile or the kerb, creating a secure, weathered and warm connection with no cold bridges. The ventilation zone arrangement is flexible depending on the specifiers requirements. For example it can include the following features:

- A unique continuous hinge is available which facilitates the opening of the ventilation zone and glazing (manually or electrically actuated). This allows for high volume air ventilation.
- A PVC extruded profile rotary ventilator system can be mounted in the sidewall of the accessory frame. The cylindrical shape protects it from the outside elements using a continuous cowl feature and can be protected with integral insect mesh. The vent is simply operated by rotating the operating handle.

Starglaze glass rooflights have the following glass specification:

6mm Clear Toughened Outter Pane
16 mm Air Gap
6.4 Clear Laminated Low E Coated Inner Pane

Mark 1 PVC Kerb This PVC kerb is fully thermally-broken and externally keyed allowing easy bonding during the installation process and is fully compatible with all roofing membranes. There is a weather bar to protected the edge of the exposed waterproofing membrane. Due to its cellular construction, there is no cold bridging, reducing the risk of condenation and ensuring good insulation and low U values. Finally, there is a flexible metal foot termination piece which can be manufactured to offer total flexibility in terms of height, insulation configuration and angle of splay to suit any roof opening size.

Mark 2 PVC Kerb This PVC kerb is manufactured using an 'all thermoplastic construction' for outstanding thermal efficiency, high resistance to weathering and low maintenance. The Mark 2 is formed from enhanced UV protected polycarbonate with vented airspaces. The integral cascade water management system ensures that moisture drains to the outside of the building and air leakage meets Part L criteria. A 2mm thick wall thickness ensures weld strength and a weather seal on all opening rooflights maintains weather-tightness. A special 'key' finish to the PVC assists adhesion of a membrane and the kerb is torch-on system friendly.

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.