How do I choose the correct size Glass skylight?
To suit your own Builders upstand
When purchasing a Glass unit without an upstand, please ensure the outside edge of your own timber upstands are positioned at the same distance as you chosen skylight size. For example, if you have a rooflight which measures 900mm x 900mm, you need to ensure the measurement from the outside edge of your upstand is the same. Please see image for further clarification. A 75mm wide upstand is recommended.
Skylight with UPVc Upstand
When purchasing a Glass unit with a UPVc upstand, the stated sizes represent the opening in the roof. Please ensure the opening in the roof is the same size as the purchased skylight. For example, if your skylight is 750mm x 750mm, the opening in the roof also needs to be 750mm x 750mm.
