We have had great service over 25 years from 6 Velux roof lights BUT now one has a leak in one lower corner. I wonder who else may have had & solved a leak.
It is difficult to discuss because of the technique they use to build these, but I have used clear sealant all round the actual window glass, I have used same at lower end of aluminium rail running down each side.
I can see the drips coming off a draught-proofing strip which runs/is channelled horizontally along the lower end of the wooden window frame
- not the outside casing.
I cannot where this water in entering the window system.
Any clues ?
Thanks