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
iDome hybrid skylights
Glass insulation and a plastic skylight in one. The iDome combines HR++ safety glass with a spherical plastic skylight: a U-value up to 0.55 W/m²K, 40 dB sound insulation, and a self-cleaning surface in the rain. The glass is impact-resistant and burglar-resistant as standard. Available in 85 sizes, fixed or openable. Ready for installation from our own stock.