I am planning on installing aluminun soffits on my garage.
The supplier I bought the materials from gave me J-Channels but they
do not have any nailing slots.
What is the proper way to install J-Channels without nailing slots?
Also the soffits are going to cover open eaves. I know a F-channel
would be easiest to use but they are not available. Can I use a
technique I've noticed where nailing slots are cut and folded back to
create a quasi 'f-channel'?