Sizing guide for modular rooflights

Applies to F100 rooflight domes and flat roof skylights

Rooflights supplied complete with upstands

When ordering rooflights with upstands, it should be noted that the critical dimension to provide is the roof opening size (see diagram). The daylight size will be 180mm less than this in both length and width - irrespective of rooflight size.

Rooflights supplied without upstands, for fixing direct to builders’ curbs.
When ordering rooflights without upstands, please provide:
• external dimensions of curb, including waterproofing
• internal dimension of curb