What to consider when looking for rooflights, lanterns or structural glazing
WORDS ANNA-LISA DE’ATH
Amultitude of overhead glazing options enables you to tailor an installation to almost any architectural design, including flat or pitched roofs. Making the best choice for a project can be complex, so take advice from the experts, who can also help you comply with Building Regulations.
The success of the glazing is down to the skillset of the team working with you. And the more complicated the project, the more advice and help you’ll need.
‘Always use an approved installer who is vetted and will comply with all necessary regulations, such as those registered with the Glass and Glazing Federation (GGF; ggf.org.uk),’ says Dave Palmer of MyGlazing.com. ‘The GGF also offers advice and protection if installations go wrong.’
ABIDE BY THE RULES
There are some instances where overhead glazing requires planning consent, so before going ahead with any work, seek advice from your local authority. Visit the Planning Portal for outline guidance (planningportal.co.uk).
All types must conform to the Building Regulations, which require the correct procedures are followed and the relevant technical performance standards met. ‘Replacement rooflights, even if in the same opening, require approval unless they are fitted by someone who can self-certify under a Competent Persons Scheme,’ explains Anna Thompson at the LABC (labc.co.uk). ‘Don’t underestimate the substantial loadings imposed by glazing. You may need the advice of a structural engineer who can provide calculations as part of the design submission to Building Control. For instance, lanterns require a very strong roof structure and frame, which will need to be inspected once approved.’
Several aspects of the Building Regulations are relevant to overhead glazing, including energy performance, fire safety, overheating mitigations and ventilation requirements. ‘Some glazing must be openable for means of escape in case of fire, or built to meet the stringent requirements for fire separation and linings, or to provide smoke ventilation,’ Anna explains. ‘Approved Document B of schedule 1 covers fire safety. Seek advice
