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Monday to Friday 0800-1700

Thermadome Rooflight - Glazing Options

Circular DomeThermadome skylights are available in bronze, opal diffused, clear or ‘Heatstop’ (reflecting up to 68% heat radiation) glazing. Polycarbonate Thermadome skylights have a minimum 3mm thick glazing. Acrylic Thermadome skylights use a minimum 3mm outer skin, with the inner skin width varying dependent on the size of the dome in question.

Thermadome skylights are available in triple, double or single skin construction. They are thermoformed from either acrylic sheet or polycarbonate. Acrylic has an impact strength 10 times greater than glass. Polycarbonate has an impact strength 250 times greater than glass and is almost unbreakable.

Performance of glazing materials
Typical Values Polycarbonate Acrylic
Fire Ratings
BS 476: Part 3
BS 476: Part 7
1991 Building Regulations

Class 1*

Class 1*
Light Transmission
Opal Diffused


Service Temperature -50° to +120°C -30° to +70°C
Note: Information for 3mm thick glazing unless noted otherwise.
* Class 0 for Building Regulation purposes.

Sound insulation - contact our expert team for information on sound reduction levels.

Shapes available of the Thermadome Rooflight / Skylight

PyramidThermadome skylights are available in different sizes. Dome skylights are produced in circular, rectangular or square shaped units. Pyramids are produced in rectangular or square shaped units. There is a limited collection of triangular shaped skylights available.


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Sizes available of the Thermadome Rooflight / Skylight

For immediate delivery, a variety of sizes are available ex-stock. We have an extensive collection of sizes, from 400 x 400mm to 1700 x 2900mm.

Performance of the Thermadome Rooflight / Skylight

Thermadome skylights are accompanied with a ten-year guarantee against the effects of defective design, construction or materials, subject to specific conditions. Thermadome skylights should be installed according to the recommendations of manufacturers to exceed the life of the roof covering.

Thermal Transmission U-Values


Condensation - Rooflights and Skylights

domeWhen warm, moist air meets cold surfaces, condensation occurs. The risk of condensation at skylight level is greater as warm air rises. Double or triple skin Thermadomes and Therma-kerb insulated upstands minimise the risk of condensation, as does appropriate ventilation. No guarantee can be provided against the development of condensation as temperature or humidity levels can never be controlled.

Supply of Rooflights and Skylights

For immediate delivery, a variety of sizes are available ex-stock. Thermadome skylights are constructed within our factory and come with sealing tape and high security screw bolt fixings.

Technical services for Rooflights and Skylights

We provide expert advice and practical support on the specification and application of Thermadome skylights and accessories.

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