ASHRAE Journal - February 2013 - 61

F

G

H

I

J

F) Install flashing tape at head; G) Install sheathing tape over flashing tape at head to terminate flashing tape; H) Interior view prior to window installation; I)
Interior view after window installation; J) Air seal window around entire perimeter on interior with sealant and sealant backer rod.

such that variables such as softness,
hardness, low temperature flexibility
and adhesion strength can be optimized.
What all this means is that today’s
acrylic tapes can handle the movement
of the wood-based sheathings and foam
2/3
1/3
sheathings–mostly because they move
in tandem with the sheathings as opposed to fighting them.Coefficients of
expansion are “tuned” to the substrate.
The elasticity of the adhesive compensates for the movement of the substrate
due to changes in temperature and Photo 14: More Termination. With flashing tapes we tend to terminate them two
moisture content.
ways—with either a sheathing tape or a bead of sealant. A sheathing tape does not
The “flashing” tapes are typically butyl need to be terminated— it terminates itself. Figure 4: Termination of Flashing Tape.
rubber based (some are acrylic based as The “red” horizontal tape is a butyl based “flashing tape” that is “terminated” by a
previously mentioned). The rubbers are “green” acrylic based “sheathing tape.”
synthetically produced and thus like the
acrylics are also “tuned” to enhance performance. They are
sealant in the joint covered with a mesh reinforcing then all of
formulated compounds that allow you to add “tackifiers” to
this painted over. But then again I am old school on this stuff.
improve adhesion.
Back to this termination thing. With flashing tapes we tend
Both acrylics and butyl tape systems have UV stabilizers
to terminate them two ways: with either a sheathing tape or a
to address solar exposure and antioxidants to address long
bead of sealant (Photo 14 and Figure 4). A sheathing tape does
term aging which can change properties over time. In a twist
not need to be terminated; it terminates itself.
to typical perceptions the tape systems tend to be as durable,
At the end of the day, taped sheathings work as well as
or more durable, than the building wraps and housewraps they
building wraps and housewraps and vice versa. But there
are adhered to.
are limitations to both. With building wraps and housewraps
With any tape, for it to function well it must be firmly pressed
the biggest single problem is making sure gravity laps are
into place. This is particularly important with acrylic tape sysactually used. Amazing as it seems reverse lapping is still the
tems. They should be installed with a roller.
most common residential construction defect I see (Photo
What’s next? We see it already in the commercial side. Seal15). Despite all the education and training in the world it
ants and “paintable tapes” replacing tapes entirely. Installing a
still happens…go figure.
sealant in the joint and then painting over or spraying over the
With tapes the biggest single problem is folks thinking they
joint sealant. Sometimes a mesh reinforcing is used, sometimes
can stick them to muddy, dirty, cold, wet and frozen surfaces.
not. Sometimes just a spray applied tape. How are they working
You would think this is obvious. Again, amazing as it seems,
out? Ah, a little too soon to tell with some systems. I like the
folks keep trying to do it.
February 2013

ASHRAE Journal

61



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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