Casting for any & all ideas about using timbers that are exposed in and out. Mostly windows (structural - ha, ha) between timbers and we need best solution/practice to provide rain barrier close to outside and air sealing line close to inside.
Wood is the absolute best douglas fir KD down to 12% - all 12" x 12" dimensions. Finish on timbers to be Sansin that will 'breath' a bit. Five (5) foot roof overhang helps a ton for this house on Vancouver Island.
We're planning an air cavity behind the outer window trim to provide low pressure relief from wind driven moisture; cavity also drains any moisture that does get thru. Drains are all 3/8" or better so water won't want to hang around.
Debating the merits of peel & stick around window against timber or are we better off without it (letting timbers breath)? Flashing below window sill catches whatever does get thru during a major 'moisture event' and drains down.
Air sealing line is rod & caulk around windows just behind interior trim lining up with rubber gaskets thru wood joinery.
It sounds, and is, really kind of complicated - but necessary to meet requirements of 10 yr warranty. Not exactly timber framing, but welcome to building in the new century.
Arch and engineer pushing for epoxy coating the end grain of all timbers (hidden in joinery), but I think this is 'kiss of death' for the long haul.
Thanks in advance. Perplexed,