Setting the glulam beams that support the roof. I used a structural roof support system called perlins. Perlins support the roof, not at the ridge but down lower on the rafter length which requires two beams instead just one ridge. In this case we were unable to use one ridge because the span was so great to size one ridge beam would have been impossible. The perlins were sized by my supplier's in house engineer. I often feel they over estimate the size of beams like this but if you factor in the cost an engineer charges to size the beam and sign off on the paperwork, the cost difference could be minimal. If the size of the larger beam is a problem then I would suggest getting an engineer to size it because they will likely be more accurate as to what is needed for your specific application.
