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

On Sep 7, 12:58*pm, muymalestado wrote:
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

Check the flashing around the outer frame and under the tiles for
pinholes and dirt that as blocked the water channels. Also, check the
back gutter for pinholes and any signs of ware. The flashings and back
gutters are made of alloy and tend to corrode.