The truss that dives into the chimney is apparently supported by the stonework. The beams are cut off flat where they intersect so the internal connectors are not seen. The flat boards of the ceiling look unsupported but are not. This is a truly stunning construction with a very heavy cost to build. I believe it is a true system.

In the olden days t hey just used very large beams and pegged the ends with round wood fasteners. My best guess is this is located in a very heavy snow area and actually needed all that heavy construction to support the weight. It has been there a good while though and is still standing.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.