ROOF GLAZING SPECIALISTS • BRISTOL
Energy-efficient rooflights
Thermal performance depends on the complete rooflight installation, not the glass alone.
Understanding U-values
A lower U-value indicates less heat transfer. Check whether a quoted figure applies to the centre pane, the complete glass unit or the overall roof window because these measurements are not interchangeable.
Insulated aluminium roof lanterns
The Sheerline S1 lantern uses Thermlock multi-chamber insulation within key aluminium sections. The specified glass, kerb construction and quality of installation remain important parts of the overall result.
Avoiding thermal weak points
A poorly insulated upstand, gaps in seals or cold bridging around the roof opening can undermine good glass performance. Kerb design and weatherproofing should be considered from the start of the roof project.
Solar gain and comfort
Energy efficiency is also about summer comfort. Solar-control glass and suitable ventilation may be worth considering in large, sunny or south-facing glazed spaces.
COMMON QUESTIONS
Frequently asked questions
Are aluminium roof lanterns thermally efficient?
Modern thermally broken aluminium systems can provide strong performance when combined with suitable glazing. The S1 uses Sheerline's Thermlock multi-chamber technology rather than relying on uninsulated aluminium.
Does more roof glass always mean more heat loss?
The result depends on glass, frame, size, kerb and installation. Roof glazing can reduce daytime lighting demand, but its winter heat loss and summer solar gain should be considered as part of the whole extension design.
How can overheating be reduced?
Consider solar-control glazing, suitable rooflight size, external shading where practical and controllable ventilation. SheerVent provides a purpose-designed high-level ventilation option for suitable S1 lanterns.
PRODUCT INFORMATION
Download the roof lantern brochures
Use these Sheerline documents to compare the S1 roof lantern system, available components, finishes and technical details. Contact us to confirm the current specification before ordering.
LET'S DISCUSS YOUR PROJECT
Need help choosing or measuring?
Call our Bristol team with your dimensions, postcode and photographs.