Mathew Newton Wrote in message:
On Thursday, 13 September 2018 21:48:21 UTC+1, JimK wrote:

How much of an upstand is there against the "host" wall?

Good question - I haven't (yet) seen how tall the upstand is as it is covered by the lead flashing (which itself looks to be about 150mm and so I know it's less than that).

What are the chances of water building up on your flat roof to
overtop the upstand?

I'd all honesty I'd say there was very little, if any, chance of that happening. There *is* definitely a fall on the roof and whilst there is still a 200kg roof lantern to go on (hence there may be some deflection of the joists)

How long are these joists?
Is the lantern going mid span?
Is all this by one building outfit?
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Jim K


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