would/could it be easier to add an extra strip of 6mm ali behind the join, and then leave a gap between the sheets?
I'm guessing it doesn't really need to be strong/need a lot of penetration, just needs to hold itself in place and seal all the gaps?
also... how are you going to do the roof?
I'm guessing it doesn't really need to be strong/need a lot of penetration, just needs to hold itself in place and seal all the gaps?
also... how are you going to do the roof?