Lead apron flashing size

Joined
22 Nov 2009
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Oldham
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United Kingdom
So I know it's generally supposed to be 150mm drop, 150mm lap and 25mm in the joint - so why doesn't lead come in 325mm widths? Is it one of those "nominal" things where in practice you just start at the top and the lap is whatever's left?
 
Thanks, I should probably start a new thread called 101 stupid questions about roofing as I'm having a go at the roof on my extension!
 

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