Product description
These 120mm roof lights are twin-skin, insulating GRP rooflight sheets and the thickest rooflight in the range. They bring natural daylight into a building while matching the thermal build-up of a 120mm insulated roof. With an inner and an outer GRP skin separated by a 120mm cavity, they suit the most highly insulated, heated buildings where the rooflight must match a very thick roof.
Minimum order 30m²
Lead time 6-7 weeks production schedule dependent
Glass Reinforced Polyester Resin (GRP)
- Outer Class 3 CE24E
- Inner Class 1 CE18
8500mm maximum length
50mm filler blocks produced in line with purlin spacings
Typical Applications
The 120mm roof lights are used where daylight and the highest thermal performance are both required on a very thick roof. Typical applications include:
- daylight strips in the most highly insulated warehouse and hall roofs
- continuously heated buildings with the strictest energy requirements
- roofs built up with 120mm insulated roof panels
- temperature-sensitive or energy-rated buildings
The sheet is made from glass reinforced polyester resin (GRP) with an outer skin (Class 3, CE24E) and an inner skin (Class 1, CE18) in a natural translucent finish, giving an overall thickness of 120 mm and a cover width of 1000 mm. Maximum length is 8500 mm, with 50mm filler blocks produced in line with purlin spacings. The minimum order is 30 m², with a lead time of 6 to 7 weeks depending on the production schedule.
When to choose this roof light?
The 120mm roof light is the thickest option and matches a very thick, highly insulated roof. For thinner build-ups choose the 100mm, 80mm or 40mm roof light so the rooflight matches the surrounding panels. For an unheated building, the single-skin 2.5mm roof light is the more economical option. A full overview is available in our clear roofing sheets section.
Suitable Accessories
For installing the 120mm roof lights we need or recommend:
- Tek screws with sealing washers, matched to a timber or steel substructure. Because of the substantial thickness the required screw length is longer. A selection is available among our screws and fixings.
- 50mm filler blocks, produced in line with your purlin spacings to close the profile.
- matching roof panels for the surrounding roof area: see the stock articles for the appropriate panel thickness.
A full overview of accessories is available in our accessories section.
Frequently Asked Questions
Which roof build-up do the 120mm roof lights suit?
They suit a very thick, highly insulated roof. For thinner roofs, choose the 100mm, 80mm or 40mm roof light so the rooflight matches the surrounding panels.
Are these roof lights insulating?
Yes. The 120mm roof light is twin-skin with a cavity between the inner and outer GRP skins, giving it thermal performance in line with a 120mm insulated roof. This avoids a thermal weak point in a heated building.
Is there a minimum order quantity?
Yes. The minimum order is 30 m², with a lead time of 6 to 7 weeks depending on the production schedule.
What is the maximum length available?
The maximum length is 8500 mm. The 50mm filler blocks are produced in line with your purlin spacings, so please send us the spacing details with your enquiry.
