From: "Paul Fritz" 
Newsgroups: misc.consumers.house alt.building.construction alt.home.repair alt.construction
Subject: Re: no housewrap...
Date: Thu, 20 May 2004 08:09:45 -0400


  "George E. Cawthon"  wrote in message
news:40AC4072.AAD66BC0@worldnet.att.net...
  >
  >
  > 3D Peruna wrote:
  > >
  > > "George E. Cawthon"  wrote in message
  > > news:40ABE48A.18459744@worldnet.att.net...
  > > >
  > > >
  > > > 3D Peruna wrote:
  > > > >
  > > > > >
  > > > > > There seems to be a misunderstanding here.  Tyvek is not a
moisture
  > > > > > barrier.  It is only put there to reduce the infiltration of air
  > > > > > through the wall, which is where much of the heat gain or loss
  > > > > > occurs.  Tyvek or similar is not required by the building code
so it
  > > > > > is purely up to you and your builder if you want it.  It is
  > > > > > certainly good to have but not required by law.
  > > > >
  > > > >
  > >
http://www.buildingscience.com/resources/walls/problems_with_housewraps.htm
  > > > >
  > > > > "The primary function of a housewrap or building paper is rain
  > > penetration
  > > > > control. It is not air infiltration despite what the manufacturers
say.
  > > The
  > > > > energy aspects of housewraps are vastly overstated. They have been
  > > embraced
  > > > > by builders for this function as can be evidenced by their market
  > > > > penetration. Yet their critical role in building durability is
under
  > > > > appreciated and not marketed. It has been a triumph of marketing
over
  > > > > physics."  -- Joseph Lstiburek, Ph.D., P. Eng.
  > > >
  > > > Good old Joe is full of bunkum.  The manufaturer makes the product
and
  > > > says what the purpose is.  Essentially thay say use this product
will
  > > > reduce air infiltration and save you money.  Now it may not save
  > > > money, but they do say what the purpose is.  Along comes Joe who
  > > > decides that the purpose of the product is something else.
Something
  > > > is a little wrong with this picture.  I think the manufaturer
  > > > determines the purpose.
  > >
  > > So...then, tell me, do you have research to prove this?  Is so, is it
  > > available?  Seems to me that the Building Science guys aren't just out
there
  > > making stuff up because it sounds good...
  >
  > What research is needed?  The manufacturer states the purpose of the
  > product.  That's it.

  Cripes you are cluless.......so what part of AND don't you understand

  "Wrapping a home or building in a weather-resistant barrier is not just
good sense, it's good building practice. Because it helps combat water,
moisture and air infiltration that are any structure's worst enemies.
Allowed to penetrate behind siding, wind-driven rain and moisture can
saturate walls, creating a breeding ground for mold, mildew and wood rot.
The properties of TyvekŪ do not support the growth of mold or mildew. Air
infiltrating from outside can create comfort-robbing cold or warm spots
while increasing heating and cooling costs.

  DuPont TyvekŪ acts like a windbreaker and wrapped over the sheathing and
under the exterior siding-cut out around windows and doors and taped
securely at the seams-resists air infiltration and water intrusion and makes
for a more comfortable, energy-efficient home or building. "



  Of course the manufacturer is going to stress the air infiltration aspect
since that one of the features that makes it superior to building felt.








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