my garage is 40 by 50 and 12 foot tall ceilings,,trusses. set on 24" centers,,the wind will make them squeal some but seems very solid,,have had no problems,have some braceing between trusses.,floor is open ,no center post,,i live in kentucky,,plenty of different types of weather,,garage is 6 years of age and very strong,i had my garage built and to get it up with sideing ,roof and concrete floor was close to 30k to 40k,,i finished the inside and electrical myself,,and i love my shop