Glass Wiki
Fixing methods, upstands, sequencing, weathering and site preparation.
Accurate glass weight supports structural design, craneage, manual handling and load checks on roof decks. This reference gives the standard density method, worked examples for typical roof light build-ups and what to add for frames and water on the glass.
Glass and metal expand and contract with temperature. Roof lights need perimeter detailing that accommodates movement without breaking seals or stressing toughened edges. This reference explains expansion rates, joint design and installation implications.
A controlled ventilation gap at the internal perimeter of a roof light reduces condensation risk in the glazing build-up. This reference explains why the gap matters, typical dimensions and what happens when it is sealed shut.
Water must drain away from a roof light on the roof surface and on the glass. This reference covers falls, ponding, internal drainage channels, overflow paths and how drainage interacts with upstands and sealant performance.
Installing a roof light on a pitched roof requires a level glazed unit, a correctly formed curb and coordinated roofing work. This how-to covers measurement, curb build-up, sequencing with slates or tiles, and weathering at the junction.
Perimeter sealants and gaskets keep roof lights weathertight while accommodating movement. This reference distinguishes structural, weathering and internal seal roles, compatible products and application practice on site.
Setting blocks support the weight of a roof light on its bearing surfaces without point loading the glass. This reference covers block material, placement, hardness and the mistakes that lead to cracked panes or seal failure.
A roof light upstand is the raised kerb that carries weathering, supports the glazed unit and separates the roof covering from the opening. This reference explains upstand height, construction, interfaces and what to check before the roof is built.
Be first to hear about new products, exclusive clearance offers and roof light inspiration — straight to your inbox.
