ASHRAE Journal - February 2013 - 60

building sciences

Installing Windows in Insulating Sheathing Openings
A

B

C

D

E

A) Insulating sheathing installed over frame wall; B) Install beveled wood siding in frame wall opening at sill to create slope; C) Install formable flashing at sill;
D) Install window plumb, level and square; E) Install flashing tape at jambs.

tapes “stick” better; they stick unbelievably well. The acrylic tapes are often used
to “terminate” the top edge of a butyl
tape. This is necessary as butyl tapes can
fishmouth (their top edge peels away or
rolls away over time), so their top edge
needs to be “terminated.” This type of
fishmouthing does not occur with acrylic
tapes. Although most flashing tapes are
butyl, advances in acrylic technology
have allowed a limited number of acrylic
tapes to function as both flashing tapes
and sheathing tapes.
Today’s tapes are resistant to UV and
heat and rain. How do we know? We stick

them outside for years and watch them,
and we also take apart older buildings
that have used them to see how well they
did (Photo 10). Nothing beats real-world
exposure (Photos 11, 12 and 13). The
real-world exposure testing is used to
develop (“calibrate”) short term “accelerated aging tests.”**
The term “acrylic” is deceptively
simple and does not give justice to
the evolution of the materials science
behind it. Acrylic adhesives are based
on acrylic polymer chemistry just like
many high performance caulks and
paints. The polymerization is “tunable”

**I am old school. It is hard to beat taking a building apart after 15 or 20 years and having a peek. We
have been doing this stuff for around 20 years and that is why I am now comfortable with the technology. The
two decades of experience “tunes” the accelerated aging stuff and system evaluation stuff to the point where
I now believe it. See the testing protocols and evaluation protocols in the Bibliography section of this column.

Photo 10: Fifteen-Year-Old Tape. This
is my house. I took things apart at a few
locations last summer to have a look at
how things were working out. The tape,
which is acrylic based, looks brand new
and is sticking like it is brand new. The
wood furring has aged, but not the tape.
I am a believer. Wasn’t that a Monkees’
hit recorded in 1966?

Photo 11: Building Science Corporation “Skunkworks” Exposure Facility. To test tape resistance to UV and heat and rain, we stick
them outside for years and watch them. The real-world exposure testing is used to develop (“calibrate”) short-term “accelerated aging tests.” Photo 12: Proprietary Florida Exposure Test Site. Not one of our sites. Lots of folks are testing things this way.
Especially the folks who make things to sell. Nothing beats real world exposure. Photo 13: Horizon Homes Test Panel. You would
be surprised at the number of homebuilders who are testing the stuff they plan to use to see how it works. Our rule of thumb is
that if it works exposed like this for two years you are pretty much good to go.
60

ASHRAE Journal

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February 2013



ASHRAE Journal - February 2013

Table of Contents for the Digital Edition of ASHRAE Journal - February 2013

Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
R-22 Hard Act to Follow: Ammonia Low-Pressure Receiver Systems
Long-Term Commercial GSHP Performance: Part 7: Achieving Quality
Thermally Active Floors: Part 2: Design
Future of DCV for Commercial Kitchens
Standing Columns and Special Sections
Building Sciences
Emerging Technologies
ACREX India 2013 Show Guide
Refrigeration Applications
InfoCenter
Data Centers
IAQ Applications
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - February 2013 - Intro
ASHRAE Journal - February 2013 - Cover1
ASHRAE Journal - February 2013 - Cover2
ASHRAE Journal - February 2013 - 1
ASHRAE Journal - February 2013 - 2
ASHRAE Journal - February 2013 - Contents
ASHRAE Journal - February 2013 - Commentary
ASHRAE Journal - February 2013 - 5
ASHRAE Journal - February 2013 - Industry News
ASHRAE Journal - February 2013 - 7
ASHRAE Journal - February 2013 - 8
ASHRAE Journal - February 2013 - 9
ASHRAE Journal - February 2013 - 10
ASHRAE Journal - February 2013 - 11
ASHRAE Journal - February 2013 - Letters
ASHRAE Journal - February 2013 - 13
ASHRAE Journal - February 2013 - Meetings and Shows
ASHRAE Journal - February 2013 - 15
ASHRAE Journal - February 2013 - R-22 Hard Act to Follow: Ammonia Low-Pressure Receiver Systems
ASHRAE Journal - February 2013 - 17
ASHRAE Journal - February 2013 - 18
ASHRAE Journal - February 2013 - 19
ASHRAE Journal - February 2013 - 20
ASHRAE Journal - February 2013 - 21
ASHRAE Journal - February 2013 - 22
ASHRAE Journal - February 2013 - 23
ASHRAE Journal - February 2013 - 24
ASHRAE Journal - February 2013 - 25
ASHRAE Journal - February 2013 - Long-Term Commercial GSHP Performance: Part 7: Achieving Quality
ASHRAE Journal - February 2013 - 27
ASHRAE Journal - February 2013 - 28
ASHRAE Journal - February 2013 - 29
ASHRAE Journal - February 2013 - 30
ASHRAE Journal - February 2013 - 31
ASHRAE Journal - February 2013 - 32
ASHRAE Journal - February 2013 - 33
ASHRAE Journal - February 2013 - 34
ASHRAE Journal - February 2013 - 35
ASHRAE Journal - February 2013 - Thermally Active Floors: Part 2: Design
ASHRAE Journal - February 2013 - 37
ASHRAE Journal - February 2013 - 38
ASHRAE Journal - February 2013 - 39
ASHRAE Journal - February 2013 - 40
ASHRAE Journal - February 2013 - 41
ASHRAE Journal - February 2013 - 42
ASHRAE Journal - February 2013 - 43
ASHRAE Journal - February 2013 - 44
ASHRAE Journal - February 2013 - 45
ASHRAE Journal - February 2013 - 46
ASHRAE Journal - February 2013 - 47
ASHRAE Journal - February 2013 - Future of DCV for Commercial Kitchens
ASHRAE Journal - February 2013 - 49
ASHRAE Journal - February 2013 - 50
ASHRAE Journal - February 2013 - 51
ASHRAE Journal - February 2013 - 52
ASHRAE Journal - February 2013 - 53
ASHRAE Journal - February 2013 - 54
ASHRAE Journal - February 2013 - 55
ASHRAE Journal - February 2013 - Building Sciences
ASHRAE Journal - February 2013 - 57
ASHRAE Journal - February 2013 - 58
ASHRAE Journal - February 2013 - 59
ASHRAE Journal - February 2013 - 60
ASHRAE Journal - February 2013 - 61
ASHRAE Journal - February 2013 - 62
ASHRAE Journal - February 2013 - Emerging Technologies
ASHRAE Journal - February 2013 - 64
ASHRAE Journal - February 2013 - ACREX India 2013 Show Guide
ASHRAE Journal - February 2013 - 64b
ASHRAE Journal - February 2013 - S1
ASHRAE Journal - February 2013 - S2
ASHRAE Journal - February 2013 - S3
ASHRAE Journal - February 2013 - S4
ASHRAE Journal - February 2013 - S5
ASHRAE Journal - February 2013 - S6
ASHRAE Journal - February 2013 - S7
ASHRAE Journal - February 2013 - S8
ASHRAE Journal - February 2013 - S9
ASHRAE Journal - February 2013 - S10
ASHRAE Journal - February 2013 - S11
ASHRAE Journal - February 2013 - S12
ASHRAE Journal - February 2013 - S13
ASHRAE Journal - February 2013 - S14
ASHRAE Journal - February 2013 - S15
ASHRAE Journal - February 2013 - S16
ASHRAE Journal - February 2013 - S17
ASHRAE Journal - February 2013 - S18
ASHRAE Journal - February 2013 - S19
ASHRAE Journal - February 2013 - S20
ASHRAE Journal - February 2013 - S21
ASHRAE Journal - February 2013 - S22
ASHRAE Journal - February 2013 - Refrigeration Applications
ASHRAE Journal - February 2013 - InfoCenter
ASHRAE Journal - February 2013 - 67
ASHRAE Journal - February 2013 - 68
ASHRAE Journal - February 2013 - 69
ASHRAE Journal - February 2013 - 70
ASHRAE Journal - February 2013 - 71
ASHRAE Journal - February 2013 - Data Centers
ASHRAE Journal - February 2013 - 73
ASHRAE Journal - February 2013 - 74
ASHRAE Journal - February 2013 - IAQ Applications
ASHRAE Journal - February 2013 - 76
ASHRAE Journal - February 2013 - 77
ASHRAE Journal - February 2013 - Special Products
ASHRAE Journal - February 2013 - Classified Advertising
ASHRAE Journal - February 2013 - Advertisers Index
ASHRAE Journal - February 2013 - Cover3
ASHRAE Journal - February 2013 - Cover4
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