The ends of the Ponderosa Pine vigas (beams) rest on the concrete bond beam that was poured on top of the cob wall (see earlier posts). The stray/clay (cob) mix will continue another 12" in height up from the bond beam to the height of the roof deck.
In order to protect thus preserve the beams for the life of the building, the beams need to be protected from moisture and wood boring insects. An inexpensive method to protect the ends of the beams is to use 'asphalt emulsion'. Asphalt emulsion is essentially a petroleum-based tar with a consistency of a thick paint. This product can be purchased at a building or masonry supply store.
The photos here show the coating applied. I used a paint brush to apply and the emulsion dried fairly rapidly.
Notice the large-head nails extending at the ends of each viga. The purpose if to help secure the cob against the beam when the cob is applied onto the top of the bond beam.
The construction of the roof system above the large room is far from over. More posts to follow.