What size posts can I use? Anywhere from 90mm through to 300mm for timber. For steel and aluminium sizes usually range from 90mm to 150mm. By Chris|2020-07-19T14:07:13+10:00July 19th, 2020|Categories: Carports|Comments Off on What size posts can I use? Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInPinterestVk