Expert: Bruce E. Johnson - 11/10/2008

Question
Following up to my earlier question ...

Do you know a particular construction technique that is especially good for wet climate like the Oregon coast?  Steel construction?  Wood?  Other materials?

Do you know what the best methods are to build in a wet climate?  And, the best insulation methods?

Thank you.

Edward

Answer
Hi Edward,  most building types can withstand the wet weather.  The trick is waterproofing and roofing.  A good overhang helps keep the rain from the wall structures. Proper building orientation goes a long way toward energy conservation.  It's amazing what kind of passive methods you can use in your building design.
If you do window walls you need to make sure that the windows are self flashing and self draining, insulated.
If you do a wood frame wall, the way the exterior is treated is your first defense against moisture.  If you use an organic siding like cedar or redwood then your main moisture barrier on the wood wall will be the paper or felt that is installed on the wall before the siding.  There are good products on the market, Tyvec, Typar that stop moisture and still breathe.
 A double wythe masonry wall is also a good system.   A concrete block wall is used as the main support structure.  This wall is coated with a heavy tar or rubber vapor barrier.  Then another wall is built one inch from the block wall out of brick or stone.  This outer wall breathes so that moisture can get into the one inch space but it runs down the waterproofing and weeps out at the bottom.  This is an excellant system when combined with foam filled masonry (if available in your area).
Concrete walls are coming back in residential constrruction.  One newer method uses styrofoam type forms that remain in place after the concrete is poured giving you insulation inside and outside the building.
So I guess to answer your query, look around your area, the locals are generally the best guide to construction that is made to resist the elements.  Also find a good architect whose work is known for being organic and energy efficient.  LEED certification ensures that the builder or Architect has taken minimal courses in the "Green building and Energy conservation" methodology.
I hope this information helps feel free to write again regarding this or other matters, sincerely bruce e johnson..bejohnsonconsulting.com