I've got a beehive roof to rebuild; I reckon the cedar on it has lasted 40 years of my ownership and maybe another 40 years of the previous owner. The rebuild should again be cedar, but I'm not sure about my access to any planked cedar but can get larch locally - would that do for the 20 more years I might survive (might only be 5 months if that stupid old American guy is right !!)
Rob
Rob