ASHRAE Journal - July 2021 - 51

COLUMN BUILDING SCIENCES
FIGURE 5 Empty Wall and Floor Cavities. Fibrous or batt insulation
are not installed in wall cavities or floor framing cavities
to further reduce risk of moisture damage arising from flood
waters. The wall assembly is insulated externally with continuous
exterior rigid insulation. Closed-cell, high-density spray
polyurethane foam (ccSPF) is installed in the frame wall cavities.
Such foam has a low water absorption and is not damaged
from flood waters. Again, all surfaces should be coated/
painted with acrylic latex paint, including interior.
Extruded Polystyrene (XPS)
Spray Polyurethane Foam (SPF), 2 in.
Closed Cell 2 lb/ft3 Density
Crown Moulding
Gap in Gypsum Board at Top of Wall
Acrylic Latex Paint Over All Surfaces Prior
To Installation of Interior Gypsum Board
Gap in Gypsum Board to Prevent Wicking
Horizontal Trim
Spray Polyurethane Foam (SPF), 2 in.
Closed Cell 2 lb/ft3 Density
Removable Wainscot (or Removable
Gypsum Board)
Gap in Gypsum at Bottom of Wall
Concrete Pads
FIGURE 6 Empty Wall and Floor Cavities. Fibrous or batt insulation are not installed in wall cavities
or floor framing cavities to further reduce risk of moisture damage arising from flood waters. The
underside of the rigid insulation on the underside of the pier foundation floor framing must be connected
through the perimeter rim joist area to the exterior wall assembly.
Fiber Cement Siding
1×4 Furring
Rigid Insulation - Expanded
Polystyrene (EPS) or
Extruded Polystyrene (XPS)
Non-Paper Faced Exterior
Gypsum Sheathing, Treated
Plywood or Treated Oriented
Strand Board (OSB)
Sealant, Adhesive or Gasket
Weep Screed-Closure
Uninsulated Wood Frame Wall
Non-Paper Gypsum Board With (Latex) Paint
Sealant, Adhesive or Gasket
Sealant at Corner of Bottom Plate and Subfl oor or Gasket
Under Bottom Plate
Adhesive
Sealant
Rigid Insulation (Taped or
Sealed Joints)
Protection Board
Pier Foundation
Sealant
Capillary Break
internally insulated with non-water
sensitive rigid insulation. The second
fl oor is wood framed. The roof
construction is a vented attic.
The interior gypsum board on
the fi rst fl oor should be considered
" sacrifi cial " in that it cannot
be readily cleaned, sanitized and
dried after wetting. After a fl ood
event, wetted gypsum board should
be cut away from wall assemblies
above the wetting line. The use of
non-water sensitive rigid insulation
such as extruded polystyrene
allows cleaning of rigid insulation
surfaces. All wood framing surfaces
on the interior of the CMU walls as
well as interior wall framing should
be coated/painted with acrylic latex
paint prior to installation of interior
gypsum board. The coating/painting
of all surfaces facilitates cleaning
and sanitization after a fl ood event.
Figure 3 illustrates an alternative
approach-the use of closed-cell,
high-density spray polyurethane
foam (ccSPF) on the interior of
the CMU walls and in the secondfl
oor frame wall cavity. Such foam
has a low water absorption and is
not damaged from fl ood waters.
Again, all surfaces should be
coated/painted with acrylic latex
paint prior to installation of interior
gypsum board-including the ccSPF.
Figure 4 and Figure 5 are variations
of CMU " raised slab foundations, "
but with frame wall assemblies
rather than CMU assemblies. Both
Figure 4 and Figure 5 have wall assemblies
that are insulated externally
with continuous exterior rigid insulation.
They have no fi brous or batt
insulation installed in frame wall
cavities to further reduce risk of
moisture damage arising from fl ood
waters. Closed-cell, high-density
spray polyurethane foam (ccSPF) is
J U LY 2 0 2 1 ashrae.org ASHRAE JOURNAL
51
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ASHRAE Journal - July 2021

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

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