LW123

Hi Thanks to everyone for the advice - I'll test the windows with a hosepipe as suggested. Thanks again

Hi everyone! I would like some advice please if possible - I have had a roofer to complete a job where he has fitted 3 Velux windows but did not follow the manufacturer's instructions e.g. not fitted rain gutter, didn't frame the window in batten, didn't put in vapour barrier, didn't follow the steps on fitting the felt, etc. He's also fitted the surrounding roof tiles and a rubberised flat roof above the Velux, and I'm concerned if any of this leaks, the windows could be damaged and need replacing as I assume the gutter is to protect the Velux in future from other leaks that might happen? He is insisting these steps in the instructions and bits from the BDX kit aren't needed and to quote him "the windows will be fine and won't leak as I've never had a problem before". He is asking I pay him in full immediately, even though the work was done only a few days ago. What should I do? Any advice would be great - where do I stand and is he right about the gutters, etc not being needed? If so, I'll gladly pay him as requested. Thanks in advance for any help provided.