1. The pitch of your roof.
The easiest way to measure the pitch of your roof is to use our roof pitch calculator. Alternatively, please ask your builder.
2. The roof covering or tile type.
There's a few ways of doing this... Either find out the manufacturer of the covering, know the material & measure it's thickness or send us a photo!
3. The flashing for your roof window.
Unless you want a leaky window, you'll need a flashing kit. Once you have step 1 and 2, our flashing finder will give you the options avaible!
