We saw all sizes of beams that are required from 4″ x 4″ up to 12″ x 12″. The Beams in the photo above are 6″ x 6″ Larch (left beam). The two beams on right of photo are of Douglas Fir 8″ x 8″. Lengths start from 3.6m(12′) up to 6.0m(20′). Availability of logs can determine lengths available.