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Hi guys,
Just wanting some advice around a poorly done patio extension prior to us buying. I'm wanting to repair, and it seems like whoever did this hasn't installed flashing between the original roof and extension causing some water to seep back in. I'm wondering what flashing would suit best. (The second roof has a very low pitch, which im also investigating).
Thanks.
Before you do anything, you mentioned the lower roof had a very flat pitch. If it's less than 5 degrees then a corrogated profile should not have been installed. If you want the roof to pass code then you may need to replace it with a trapezoidal profile such as Trimdek.
Once this is established, transition flashing should ideally be installed which would require pulling up the top section of roof.
Foam infills (designed for the specific sheet profile) stuck down with double sided butyl tape would be the easiest way to protect the bottom end of the flashing from any blow back. Otherwise the bottom edge of the flashing will need to be custom cut to fit the sheet profile which can be tedious over longer lengths.
If you want to do a cheap and nasty and you're not concerned with bringing the roof up to code, I'd just pull up the top sheets, stick down some foam infill to close the gap, check that all the valleys along the top edge of the bottom roof sheets are turned up and screw the top sheets back down again.
