Mac flash universal lead slate

[Scott_D]

Are these good or best avoided?
I need to give a builder a lead slate to put into the roof for a boiler install at a later date.
The mcalpine Mac flash universal slate is very cheap at the merchants.
Are they good or best to stick to the manufacturers own slate kit?

 

[ShaunCorbs]

TBH I would always go for a manufacturer’s own reason why the flies designed for it eg like the baxi and Worcester ones the flue slots into it