> As part of that
> design, I use building paper and housewrap, carefully considering what
> appropriate for each situation.
> OK, so where is #15 felt better than Tyvek, considering that it leaks
Under asphalt shingles, to wrap steel columns under a brick or other
I don't find anything to disagree with you. The use of new materials
dictates using new construction techniques and designs. Older
carpentry, relied on gravity to get rid of water, e.g., window sills
that slope down on the outside, window and door frames that are
constructed to channel flow water to the outside if it does get past
the siding, specific overlaps, etc. and not on materials. My main
gripe is that new construction often ignores water flow and relies on
caulka and materials to prevent water entry. The problem is that
caulks often fail, and if the openings are not constructed to deflect
water outward, that is a prescription for rotting. I'm not saying all
old construction designs are good. Some can't be used because of the
cost in todays environment, others are dangerous, etc., but many
remain worthwhile or as a backup to more modern materials. The
problem with many modern materials, is they seemed to become approved,
even mandated, before proven and are later found to be problematic and
can contribute to indoor environmental problems.
That is also why I don't rely on all modern materials...I'd prefer lapped
building paper to housewrap in most situations. I also detail using gravity
to help manage moisture. It's part of the whole package. Overlapping
flashings, pitched sills, etc. are all necessary. Caulk & Tyvek aren't part
of the solution (in fact, caulk should never be part of the water management
system - you can use it, but don't rely on it to keep the water out). It's
also understanding the strengths and weaknesses of each material and
appropriate application of those materials.
It's intelligent thinking about the issues and using common sense (if that's
even available anymore).
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