LEXAN Thermoroof multiwall daylighting — 20 mm sheet, 45 mm rib

Deep inside a hall, wall windows often provide less light than they do near the façade. Rooflights introduce it from above to illuminate areas away from the external walls. Sandwich panel roofs use elements matched to the roofing geometry, including multiwall polycarbonate solutions. They combine low weight and light transmission with a structure that helps reduce heat loss compared with simple, thin glazing.

Opening the roof to daylight can illuminate a work area, an aisle between racks or the centre of a warehouse. Compared with relying solely on façade windows, this provides more freedom in positioning bright areas indoors. A suitable rooflight arrangement may reduce the need for artificial lighting in favourable daytime conditions. For users, however, the quality of the space itself matters: easier recognition of the surroundings and a more natural working environment. This is also valuable in workshops and agricultural buildings where large solid walls are needed for equipment or protection of stored materials.

The internal webs of multiwall polycarbonate create air spaces that restrict heat flow. This construction provides better insulation than a thin solid sheet designed simply to admit light. In a heated hall, that matters because the rooflight belongs to the same building envelope as the insulated roof panels. Light levels and thermal properties are therefore selected together. An appropriate variant can diffuse sunlight and soften illumination across a larger area. The owner can make a considered compromise between daylighting and limiting the influence of outdoor conditions on indoor temperature. Both functions depend on the construction of the particular element.

Polycarbonate’s low weight allows a larger daylighting area without the weight typical of many glass systems. A profile matched to the roof panel helps maintain consistent joint geometry and a coherent roof surface. The UV-protective layer supports the material in sunlight exposure appropriate to its intended use. A ready-made rooflight with a compatible profile simplifies planning the roofing interface. With individually designed glazing of a different geometry, the transition between shapes needs a separate solution. Compatibility with the roofing system and design loads remains essential. The owner gains daylighting as part of a planned envelope while retaining the lightweight character of the hall roof.

SteelProfil offers rooflights for sandwich panel roofs and helps compare variants for the intended building. Our wider range includes first- and second-grade goods available from stock. Numerous promotions and competitive prices help you assemble the roofing together with its daylighting elements.