You always order by daylight size: the clear opening visible from inside. Your new skylight fits straight away.
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Daylight size= your order size
The clear opening visible from inside. Measured along the inside of the curb, from edge to edge.
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Roof openingstraight curb = daylight size
The opening in your roof. With a straight curb (/00), it equals the daylight size. With a sloped curb (/20 or /30), it is 20 or 30 cm larger.
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External skylight size= daylight size + 160 mm
What you measure on the outside of an existing skylight. The flange extends 80 mm on each side. Subtract 160 mm to find your daylight size.
Sizing questions
What is the difference between daylight size and roof opening?
I am measuring my skylight from the outside. What do I order?
You already have a Skylux curb
You are creating a new roof opening
You have a curb from another brand
Replace your old skylight in 1, 2, 3.
Upgrade without demolition work. Our adapter frame always fits.
Adapter frames
Replace your old skylight without demolition work. The Skylux adapter frame is screwed directly onto your existing curb, regardless of brand or material (wood, PVC, polyester). Impact-resistant white PVC with integrated EPS insulation (Ue 0,78 W/m²K). Available in 110 standard sizes, compatible with curbs from 150 mm height. Installed in one day, with the roof covering left intact. Not sure which size you need? Our advisors will help you.