Recently a project came across our desk that was an unusual attic design. The architect had drawn in an attic condition that “stepped up and over the floor joists at one end of the building. In other words, the attic truss had no bottom chord!
The design was 2 mono trusses “sistered” together at a ridge girder over the attic space. The mono truss had to step up and over the depth of the floor joists that were weaved in between the roof trusses.
While the design at the end walls was fairly simple to accomplish, as the trusses tied back in the adjoining planes, it presented some challenges. As the ceiling condition transitioned, some of the trusses had to rest on the top chord of a girder and others had to hang into the bottom chord…of the same girder!
The girder itself had to leg down. Yuck!
At the other end of the building, the plan called for the floor depth being built into the dual-pitch attic truss.
The fun part was that the ceiling condition of the slope up to the attic ceiling height was to remain consistent throughout the entire building!
Sometimes, these attic design can be head-scratchers. On this particular design, the architect did a fabulous job anticipating everything and it all worked out beautifully. Ah yes, the beauty of the attic truss!
What types of unusual attic designs have you seen in your travels?
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