ASHRAE Journal - November 2021 - 50

COLUMN BUILDING SCIENCES
FIGURE 2 Map of Freeze-Thaw Risk. Freeze-thaw damage
needs water and freezing temperatures. The greatest risk
are regions with more than 20 in. (508 mm) of annual
rainfall coupled with cold and very cold climates. The
shaded area of the map combines rainfall with cold and
very cold climates.
Historic folks like the term reversible
because they can " undo " whatever is
done later. Of course, they shouldn't
because the " intervention " saves the
building. The discussion often gets
quite animated-we will leave it for
later-with the understanding that
" saving the building " is more important
than " preserving a dumb detail. "
Speaking of dumb details, check
PHOTO 6 (Top Left) Notre-Dame Basilica of Montreal. Look closely at the horizontal " bands. " They were supposed
to act as drip edges. PHOTO 7 (Top Right) Notre-Dame Basilica of Montreal. Deuxieme partie. Original drip edges
did not work. They got retrofitted with lead-coated copper drips. PHOTO 8 (Bottom Left) Legislative Assembly of
Ontario. We got it wrong in Toronto on our Legislative Assembly a hundred years later and had to add drip edges.
PHOTO 9 (Bottom Right) Canada Life Building in Toronto. We messed up the building during the depression years,
but fixed it with retrofitted drip edges.
Yeah! As much as I want to pick on folks from Montreal
(because the Habs keep beating my Leafs), they got it
sorted out. Look at the retrofitted drip edges that are
going hand-in-hand with the energy-efficient window
replacement and interior insulation (Photo 10). And
guess what? It has caught on in New Zealand (Photo 11)
and in Czech Republic (Photo 12).
Roof edges are a big deal. We have been retrofitting
" reversible " parapet coping drips (Figure 3 and Photo 13).
50
ASHRAE JOURNAL ashrae.o rg N O V E M B E R 2021
out Photo 14. Wow, dumping the roof
rainwater runoff right on the wall.
Ouch. Good news-got fixed. An
elegant fix that is pretty much invisible.
A minor kick out with a major
impact-a short diagonal metal roofing
ridge directing water away from
the roof/wall interface (Photo 15).
The entire point of all this is that
we can do seemingly minor changes
from an aesthetic perspective that
have major impacts on the flow of rainwater on building
surfaces, reducing the concentration of rainwater
and thereby reducing the amount of rainwater
absorbed by materials. If we do this we can safely insulate
old buildings and not damage them from freezethaw.
Even if we don't insulate old buildings, we can
save them from water damage. If we do this right, no
one will know we were even there.
http://ashrae.org

ASHRAE Journal - November 2021

Table of Contents for the Digital Edition of ASHRAE Journal - November 2021

Contents
ASHRAE Journal - November 2021 - Intro
ASHRAE Journal - November 2021 - Cover1
ASHRAE Journal - November 2021 - Cover2
ASHRAE Journal - November 2021 - 1
ASHRAE Journal - November 2021 - Contents
ASHRAE Journal - November 2021 - 3
ASHRAE Journal - November 2021 - 4
ASHRAE Journal - November 2021 - 5
ASHRAE Journal - November 2021 - 6
ASHRAE Journal - November 2021 - 7
ASHRAE Journal - November 2021 - 8
ASHRAE Journal - November 2021 - 9
ASHRAE Journal - November 2021 - 10
ASHRAE Journal - November 2021 - 11
ASHRAE Journal - November 2021 - 12
ASHRAE Journal - November 2021 - 13
ASHRAE Journal - November 2021 - 14
ASHRAE Journal - November 2021 - 15
ASHRAE Journal - November 2021 - 16
ASHRAE Journal - November 2021 - 17
ASHRAE Journal - November 2021 - 18
ASHRAE Journal - November 2021 - 19
ASHRAE Journal - November 2021 - 20
ASHRAE Journal - November 2021 - 21
ASHRAE Journal - November 2021 - 22
ASHRAE Journal - November 2021 - 23
ASHRAE Journal - November 2021 - 24
ASHRAE Journal - November 2021 - 25
ASHRAE Journal - November 2021 - 26
ASHRAE Journal - November 2021 - 27
ASHRAE Journal - November 2021 - 28
ASHRAE Journal - November 2021 - 29
ASHRAE Journal - November 2021 - 30
ASHRAE Journal - November 2021 - 31
ASHRAE Journal - November 2021 - 32
ASHRAE Journal - November 2021 - 33
ASHRAE Journal - November 2021 - 34
ASHRAE Journal - November 2021 - 35
ASHRAE Journal - November 2021 - 36
ASHRAE Journal - November 2021 - 37
ASHRAE Journal - November 2021 - 38
ASHRAE Journal - November 2021 - 39
ASHRAE Journal - November 2021 - 40
ASHRAE Journal - November 2021 - 41
ASHRAE Journal - November 2021 - 42
ASHRAE Journal - November 2021 - 43
ASHRAE Journal - November 2021 - 44
ASHRAE Journal - November 2021 - 45
ASHRAE Journal - November 2021 - 46
ASHRAE Journal - November 2021 - 47
ASHRAE Journal - November 2021 - 48
ASHRAE Journal - November 2021 - 49
ASHRAE Journal - November 2021 - 50
ASHRAE Journal - November 2021 - 51
ASHRAE Journal - November 2021 - 52
ASHRAE Journal - November 2021 - 53
ASHRAE Journal - November 2021 - 54
ASHRAE Journal - November 2021 - 55
ASHRAE Journal - November 2021 - 56
ASHRAE Journal - November 2021 - 57
ASHRAE Journal - November 2021 - 58
ASHRAE Journal - November 2021 - 59
ASHRAE Journal - November 2021 - 60
ASHRAE Journal - November 2021 - 61
ASHRAE Journal - November 2021 - 62
ASHRAE Journal - November 2021 - 63
ASHRAE Journal - November 2021 - 64
ASHRAE Journal - November 2021 - 65
ASHRAE Journal - November 2021 - 66
ASHRAE Journal - November 2021 - 67
ASHRAE Journal - November 2021 - 68
ASHRAE Journal - November 2021 - 69
ASHRAE Journal - November 2021 - 70
ASHRAE Journal - November 2021 - 71
ASHRAE Journal - November 2021 - 72
ASHRAE Journal - November 2021 - Cover3
ASHRAE Journal - November 2021 - Cover4
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