Hi all, this is my first post so please be gentle. My knowledge is limited to what I've been able to Google. I'm definitely not a roofing expert and I'm learning as I go, although I have done lots of DIY elsewhere and I'm happy to take on big projects.

 

We have a new rooflight going into the pitched roof of our new kitchen. The roof is existing and a hole has been cut. The rooflight extends to the end of the gable and meets a piece of vertical glass forming a window, for which there is also a hole in the gable end. See attached pictures. The blue arrows are potential water flow routes. There is a small upstand, shown in brown and the rooflight is about 3m long. I've only drawn part of it. The frame (in grey) and upstand actually go all the way around 3 sides.

 

My primary question is about designing the flashing and drainage at the back of the rooflight on the high side of the roof. My thought was to use lead flashing and slope the upstand slightly away from the gable to direct the water away from the edge.

 

Can I do this with lead on such a small slope (perhaps 1:80) and can I just use <1.5m lead lengths and lap it 150mm (or more?) to ensure it doesn't leak. Is there a better option I'm not thinking of? How should I seal it, or should I not?

 

 

 

 

 

 

 

 

 

Edited October 24, 20233 yr by David99
Additional detail

The roof lights normally have a flashing kit that can be bought separately 

This is a custom made rooflight with a bespoke upstand and is 3.3m long. I couldn't find anything suitable of the shelf so far, but maybe there is something?

Not the Q, but I am intrigued as to how you will make a permanent, waterproof seal between the vertical glass and the roof glass. Will the roof glass meet the vertical glass via silicone, or will the frame of the roof glass be cleverly rebated so that the glass on each plane rebates into the frame?

Fortunately, this is a problem for the glass company and they are experienced in frameless glass. I believe it is a special silicon seal of some sort, but not too sure. It is glass on glass at the corner.

Edited October 25, 20233 yr by David99
Spelling