Size:
• Up to 1000 x 2000 mm.
...(Depends on load on glass, some restrictions may occur).
Upstand:
• If the roof is <7° the upstand must be cut beveled to 7° to prevent water ingress.
• Frame height:
- Upstand (timber): from 200 mm with jumps of 50 mm.
- Frame height is measured vertically.
• Thickness of frame:
- Timber: 9 mm plywood/45 mm insulation/9 mm plywood.
• Vertical upstand: free light opening = roof opening
• Height depends on insulation depth.