What is a mono truss?So for my lean2s i will dig out columns front and back the length of the building every 8’. And because i have a 2’ eve i will go mostly to top and caulk a pice of flashing. Could also do a mono truss but thats more money. But if i didn’t do the spray foam first i would pull it down and do the mono truss and i would be sealed. So in your case if No spray foam or if you do batting you could take it down do it correctly Mono truss or do a ledger route out for the tin were it raises caulk and seal.