I have to span a square of about 50 by 50 feet with a roof. The roof should have a cupola in the middle.
I am wondering if I can simplify construction of the roof and reduce cost by putting up four columns arranged in a much smaller square in the middle of the larger square. These columns would form the base of the cupola and be tied together on the top by a sturdy wooden square frame.
What I am hoping to do is to eliminate large and complex trusses by having rafters running from the exterior wall to the columns and tying into the frame on the columns directly (somewhat like in a shed roof). The cupola will then be erected above the square frame on top of the columns. The rafters would have to be about 25 feet long and span empty space.
If simple rafters cannot span this, would it at least result in less complex and smaller trusses that are easier to transport and handle. Can I do this and achieve significant cost reduction in the construction of the roof.?
If this particular construction does not work can columns be used to simplify the construction of the roof in some other way?
What do you think?