I have a 4 year old centre pivot velux window and has started to rain in .It only happens when it is heavy driving rain .It is leaking in from the bottom left hand corner,When checked further it appears that the left hand side inside framework had water on it,but cannot find how it is getting onto it and making its way down to the bottom corner.

Chris, October 2010

the 10mm 'bitumastic' seal between the aluminium strip and the glass perishes over time, and allows water in which gathers at the bottom corner(s)

James Griffin, May 2021

I've just cured a similar problem. It turned out to be a leak in the frame alongside the centre hinge. To see clearly it is necessary to unscrew the aluminium frame strip at the edge of the glass. It seems to have been caused by the aluminium strip digging into the frame as it tilts.

To prevent it happening again I had to trim and round off the top end of the aluminium strip on the moving part of the window. Side cutters and a file are adequate. Once modified replaced and checked that it didn't catch anywhere in the full range of movement.

To repair the frame I cleaned it all up, flattened down the frame where a sharp edge had been left sticking up and patched it with a piece of flashing tape.

As I type it is raining heavily but that particular bit of roof (inside!) is still completely dry.

DUB, July 2012

Same problem too. leaks at the bottom corner of the frame and is also getting into the roof bottom end of the window. Had a look on th eroof and everything looks fine. i even changed some of the scres which holds the corrugated flap at the bottom to those screws with a rubber seal. NMade no difference.

nigel, March 2011

Same problem.

Anyone resolved this?

JRF, February 2011

I have the same problem. I was just looking if velux supplied any new seal kits or anything to remedy the leaks. It doesn't look like it, I may investigate mine myself to see if there is anything to be done but not till it stops raining!

Simon, February 2011