Do Flat Roof Lanterns Reduce Heat Loss?

A well-designed flat roof lantern can help reduce heat loss when it uses energy-efficient glazing and a thermally broken frame. Its overall thermal performance depends on the glazing specification, frame construction, installation quality and sealing. A poorly installed or inefficient roof lantern may increase heat loss, so check its U-value and installation details before choosing one.

What U-Value Should a Flat Roof Lantern Have?

A lower U-value indicates better thermal insulation. The appropriate U-value depends on the product and the applicable building regulations for the project. Check the manufacturer's declared whole-unit thermal performance rather than considering the glazing alone.

Does Double or Triple Glazing Reduce Heat Loss in a Roof Lantern?

Both double and triple glazing can reduce heat loss compared with less efficient glazing. Triple glazing may provide improved insulation, although performance also depends on coatings, gas fill, spacer bars and frame design. Compare the complete roof lantern's specifications.