Product description
These 40mm roof lights are twin-skin, insulating GRP rooflight sheets that bring natural daylight into a building while matching the thermal build-up of a 40mm insulated roof. With an inner and an outer GRP skin separated by a 40mm cavity, they suit heated buildings where single-skin rooflights would create a thermal weak point.
Minimum order 30m²
Lead time 7-8 weeks production schedule dependent
Glass Reinforced Polyester Resin (GRP)
- Inner skin Class 1, 6oz
- Outer skin Class 3, 8oz
8500mm maximum length
50mm filler blocks produced in line with purlin spacings
Typical Applications
The 40mm roof lights are used where daylight and thermal performance are both required. Typical applications include:
- daylight strips in insulated warehouse and hall roofs
- heated commercial and industrial buildings
- roofs built up with 40mm insulated roof panels
- projects where condensation control matters
The sheet is made from glass reinforced polyester resin (GRP) with an inner skin (Class 1, 6oz) and an outer skin (Class 3, 8oz), giving an overall thickness of 40 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 7 to 8 weeks depending on the production schedule.
When to choose this roof light?
The 40mm roof light is twin-skin and insulating, making it the right match for a roof built up with 40mm insulated roof panels. For an unheated building or a simple daylight strip, the single-skin 2.5mm roof light is the more economical choice. Where the surrounding roof is thicker, a matching 80mm, 100mm or 120mm roof light keeps the build-up consistent. A full overview is available in our clear roofing sheets section.
Suitable Accessories
For installing the 40mm roof lights we need or recommend:
- Tek screws with sealing washers, matched to a timber or steel substructure. 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: insulated roof panels.
A full overview of accessories is available in our accessories section.
Frequently Asked Questions
How do the 40mm roof lights differ from the 2.5mm version?
The 40mm roof light is twin-skin and insulating, matching a 40mm insulated roof, whereas the 2.5mm roof light is a single skin that provides daylight only, without insulation. For heated buildings the 40mm version avoids a thermal weak point.
Which roof build-up do these suit?
They are designed to match a roof built up with 40mm insulated roof panels. For thicker roofs, see the 80mm, 100mm or 120mm roof lights.
Is there a minimum order quantity?
Yes. The minimum order is 30 m², with a lead time of 7 to 8 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.
