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Looks like this chap had exactly same problem as me. Same tiles and he even used the EDW flashing but still had leaks. //www.diynot.com/forums/roofing-guttering/velux-windows-leaking-after-installation.338104/

All the lead work is sound, my dad is very much a belt and braces man. Felt is turned up under the lead etc so 100% certain it is not coming in there. It's totally baffling why/how it is coming in, the only explanation I can think of it simply that it is the wrong velux flashing and it is...

Just measured it and it's 100mm

Just used an app for my phone on the roof. Sat the phone on a long level and it gave 15.1 degrees.

I wonder what the difference between the two actually is? May ring Velux Monday and see what they say. Thanks for your input matey.

Well the EDZ is for 20 degrees as min, so I'm wondering if the EDW should have been used as that goes down to 15 degrees. I just can't work out how it is getting under the felt and onto the plasterboard. You would think it would be coming in the reveals if anywhere.

I Think it is just about 20 degrees, but not sure how to measure it to be honest.

Long time lurker in need of some input off you roofers please :D I had a new extension built with two Velux windows put in with EDZ flashing kits. Prior to holes being cut for windows, with just felt and baton it was sound when it rained with only a little ingress due to the flashing not...