Understanding Roof Windows and Rooflights
It's important to distinguish between these products. Roof windows are typically designed for pitched roofs, whilst rooflights are generally installed on flat roof surfaces. Both serve similar purposes but have different installation requirements. The National Domelight Company offers comprehensive options through rooflights-skylights.co.uk for various architectural needs.
Key Installation Considerations
Size and Dimensions
Selecting the right dimensions is essential for both aesthetics and structural integrity. Standard roof window sizes typically start from around 600x600mm, with hundreds of standard options available. For projects requiring specific dimensions, made-to-order or bespoke units can also be supplied.
The required size depends on the installation method:
- If you are constructing your own timber kerb or builder’s upstand, the key measurement is the overall weathered timber kerb size.
- If you prefer a complete unit with a preformed factory upstand, options are available in PVC or polyester powder-coated aluminium, helping to save time and costs on-site. In this case, you need to refer to the roof opening size for the correct dimensions.
For larger installations, products such as the Brett Martin Glass Link modules can be lapped together to form continuous rooflights. These premium quality, factory-assembled units create a sleek aesthetic ideal for both residential and commercial applications.
Glass Specifications
Safety regulations require that for overhead glazing, the outer pane of double-glazed skylights must typically be toughened glass. For installations less than 5 metres from the ground, two sheets of toughened glass are often suitable, whilst heights exceeding 5 metres require laminated glass for the inner pane.
The Brett Martin Flat Glass Rooflight Electric Hinge features laminated double glazed units comprising 6mm toughened outer glass, 90% Argon filled cavity, and 7.5mm laminated soft coat Low E inner with 1.5mm PVB interlayer, offering excellent thermal performance.
Practical Installation Guidance
Delivery and Storage
Construction materials are typically delivered 'to the kerb', requiring on-site transport to the installation location. Even a relatively small 750x750mm laminated rooflight can weigh over 31kg, with larger units potentially exceeding 150kg.
Products should be stored on a flat, dry surface, protected from rain and direct sunlight. Glass rooflights should be stored horizontally with no heavy items placed on top.
Moving Rooflights to Position
For bulky units or difficult access locations, specialised lifting equipment may be necessary. For installations like the Brett Martin Glass Link 5000mm x 1000mm unit, mechanical lifting equipment is essential. Remember that the customer is responsible for unloading deliveries, and appropriate labour and equipment should be ready on site.
Following Instructions
Many roof windows come with installation guides covering multiple products that may appear similar but have different fixings. It's critical to follow these instructions precisely to ensure long-term performance.
For flat roof installations using powered opening glass rooflights, proper sealing is crucial. Apply mastic or silicone around the top inside edge of the upstand and install roof covering according to the manufacturer's recommendations.
Aftercare
Check fixings, opening frames, ventilation and sealing tape annually. For cleaning, use mild soapy water without abrasives and rinse thoroughly. Any protective film should be removed from the rooflight immediately after installation.
Summary
Proper specification and installation of rooflights involves numerous considerations beyond appearance. From structural requirements to glass specifications and installation techniques, each element ensures a successful outcome.
The range of products available through rooflights-skylights.co.uk caters to diverse architectural needs. For specific queries about products such as the Brett Martin range or installation requirements, contacting their technical team early in your project timeline can provide valuable guidance and prevent costly mistakes.