ASHRAE Journal - December 2020 - 60
COLUMN BUILDING SCIENCES
PHOTO 4 More Bay Bump Outs. The same thing as in Photo 3 is going on here.
The roof flashing is sealed to the face of the brick. It does not penetrate through
the brick and connect to the water control layer behind the brick.
PHOTO 5 Bump Out Approach One. Copper roof with an integral roof is installed
first, before the brick veneer and before the water control layer. Easy, elegant
and it works. So why not take this approach all the time? Ah, it is a pain in the
butt to protect the metal roof while the brick is installed. It tends to get damaged
so the builders want to install it after the brick.
FIGURE 4 " Brick Gutter. " The brick veneer is supported by a metal angle and constructed within a metal " gutter. " The water control layer is lapped into this gutter
and the water that drains down the water control layer into the gutter is drained
out both ends of the gutter. The gutter extends past both sides of the bay and
drains into the wall cavity of the main walls.
FIGURE 5 More Brick Gutter. The metal roof is sealed to the face of the brick.
Extend Window Sill Flashing
Over Water Control Layer
Extend Water Control
Layer Into Gutter
Approved Sealant
Surface Mount Copper
Flashing Roof Flange
Copper Roof Bay Window
18 GA
Galvanized
Gutter
Steel Lintel
Brick Inside of Gutter
water control layer in the wall where the vinyl siding is
to be installed. In the brick wall, the metal roof flashing is sealed to the face of the brick veneer. The flashing
does not penetrate through the brick and connect to the
plastic membrane water control layer behind the brick.
Simple, obvious and very expensive to fix.
The metal roof has to come off. The framing supporting
the metal roof has to come off to expose the steel angle
supporting the brick. The brick has to come out above the
metal roof. A through-wall flashing has to be installed to
direct the water draining behind the brick to the outside
of the wall/roof intersection. Ouch.
Same thing is going on in Photo 4. The roof flashing is
sealed to the face of the brick. I see this over and over
again. So how should the flashing be installed? A couple
60
ASHRAE JOURNAL
ashrae.org
D ECEM BER 2020
Galvanized Gutter
Steel Lintel
of approaches. The first is shown in Photo 5. The second
in Photo 6. The third in Figure 4 and Figure 5.
In Photo 5, the copper roof with an integral roof is
installed first, before the brick veneer and before the
water control layer. Easy, elegant and it works. So why
not this approach all the time? Ah, it is a pain in the butt
to protect the metal roof while the brick is installed. It
tends to get damaged, so the builders want to install it
after the brick.
In Photo 6, a fully adhered water control layer is
installed prior to the installation of the brick and prior
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ASHRAE Journal - December 2020
Table of Contents for the Digital Edition of ASHRAE Journal - December 2020
Contents
ASHRAE Journal - December 2020 - Intro
ASHRAE Journal - December 2020 - CT1
ASHRAE Journal - December 2020 - CT2
ASHRAE Journal - December 2020 - Cover1
ASHRAE Journal - December 2020 - Cover2
ASHRAE Journal - December 2020 - 1
ASHRAE Journal - December 2020 - Contents
ASHRAE Journal - December 2020 - 3
ASHRAE Journal - December 2020 - 4
ASHRAE Journal - December 2020 - 5
ASHRAE Journal - December 2020 - 6
ASHRAE Journal - December 2020 - 7
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ASHRAE Journal - December 2020 - Cover3
ASHRAE Journal - December 2020 - Cover4
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