in the process of converting an old barn into a garage. I want to modify the trusses in the garage to achieve the highest ceiling height possible. The garage section is 10 meters long with a so-called light roof made of sheet metal. All the timber in the trusses today is spruce timber with dimensions of approximately 220*145 and spaced at about 3000-3500mm center-to-center. In the first picture, you can see how they look today. Is it possible to modify them according to any of the two example pictures also included, or are there any other ideas or tips?
 
  • Diagram illustrating a triangular roof truss design with dimensions 7000mm horizontally and 3000mm vertically, marked with timber size 220x140.
  • Diagram showing a truss with dimensions labeled 7000mm horizontally and 3000mm vertically, using 220x140 timber, as part of a garage renovation plan.
  • A diagram showing current roof truss design with measurements: 7000 mm width and 3000 mm height, made of spruce wood beams, marked as 220x140.
The function of the lower log is to bear in tension. If you remove it, the outer lower corners of the pyramid will sink outward.

A variant of the second image might possibly work.

But can't you just raise the inner ceiling to the upper cross beam and keep the lower beams visible? If it's an old barn, I would think it would be nice to retain a bit of rusticity and history in the house.
 
cannot keep the lower beam because I want a lift in the garage and to be able to lift a car high enough it's in the way but as written, the image in the first example can work
 
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