ASHRAE Journal - March 2015 - 56
COLUMN BUILDING SCIENCES
What about turning the sheathing itself into both the water control layer and air control layer?
Yes, see Figure 4 and Photo 13. You
could even have the sheathing be
the thermal control layer (Figure 5
and Photo 14).
You still need to deal with the
joints of course. Tapes are currently the technology of choice,
but I see that changing. I see fluidapplied joint systems replacing
tapes-due to speed, cost, surface
adhesion advantages and application temperature advantages
(Photo 15).
So where are we after 40 years?
We went from the interior to the
exterior with air barriers. And we
went from combining the vapor
barrier with the air barrier on
the inside to combining the water
control layer with the air barrier
on the outside. We went from films
on the inside to sheet goods on the
inside. Then we went from films
on the outside to sheet goods on
the outside. We went from caulking and the black death on the
inside to tapes and fluid-applied
joint systems on the outside. We
are not done of course. But we are
well on the way. It is only a matter
of time that production builders
move the airtightness bar from 3
ach at 50 Pa to 1 ach at 50 Pa.
Bibliography
Hutcheon, N.B. 1953. "Fundamental
Consideration in the Design of Exterior
Walls for Building." NRC Paper No. 3087,
DBR No. 37. Division of Building Research,
National Research Council of Canada.
www.info.hotims.com/54426-35
56
ASHRAE JOURNAL
ashrae.org
MARCH 2015
PHOTO 15 Fluid-Applied Joint System. Replacing
tapes with fluid-applied joint systems is now
possible.
Hutcheon, N.B. 1978. "Forty Years of Vapor
Barriers." Canadian Consulting Engineer,
special publication on Moisture Control.
Rowley, F.B., "A Theory Covering the
Transfer of Vapor Through Materials."
ASHVE Transactions 45:545, 1939.
www.info.hotims.com/54426-42
ASHRAE Journal - March 2015
Table of Contents for the Digital Edition of ASHRAE Journal - March 2015
Contents
ASHRAE Journal - March 2015 - Intro
ASHRAE Journal - March 2015 - Cover1
ASHRAE Journal - March 2015 - Cover2
ASHRAE Journal - March 2015 - 1
ASHRAE Journal - March 2015 - 2
ASHRAE Journal - March 2015 - Contents
ASHRAE Journal - March 2015 - 4
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ASHRAE Journal - March 2015 - Cover3
ASHRAE Journal - March 2015 - Cover4
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