I'm in the process of working with a timber framer to build a 28 x 48 tall posted cape with an 8' gabled bump-out. The original timber design was 28 x 44 using four king post bents with principal rafters and common purlins. The two external bays were 14' and the central bay was 16'. My design has the central bay at 20' with the two outer bays at 14'. Can this design be done with a bent system where the bent spacing in the central bay is 20'? Most books I've read (Benson's and others) say 16' should be the max. Thanks for your help.
Otto Parets