Flashing kit for Velux windows

[needahand]

Have just calculated the pitch of a roof that I am fitting 3 Velux windows to. The flashing kits are available in two types for the tiles that I have(15-90 degrees and 20-90 degrees).

The pitch is 20.23 degrees which is just over the threshold for the cheaper option. I am assuming that it would be OK to use this but would it be more sensible to get the dearer kit?

 

[datarebal]

Which tile do you have on the roof?

 

[noseall]

a flashing kit can not differentiate between pitches. as far as a flashing kit is concerned, all roofs are flat. the angle at which the velux sits to the rafters is always the same,.

however, i do recognise there may be a need for a kit for very shallow pitches.

as datarebal has said, it is mostly to do with tile profile where differences occur.