ASHRAE Journal - April 2021 - 50
COLUMN BUILDING SCIENCES
PHOTO 4 Structural Insulated Panels (SIPs). They
can act as the air control layer, vapor control layer
and thermal control layer, but not the water control layer. They need to have a water control layer
installed on their exterior.
PHOTO 5 Insulated Concrete Forms (ICFs). They can act as the air control layer, vapor control layer and thermal
control layer. They need to have a water control layer installed on their exterior or a cladding such as polymerbased stucco directly attached to their exterior face, creating a barrier wall mass assembly.
PHOTO 6 Spray Polyurethane Foam. When you
spray closed-cell, high-density spray polyurethane
foam (ccSPF) on the exterior of gypsum sheathing
or plywood or OSB, it can act as the water control
layer, air control layer, vapor control layer and
thermal control layer-all four control layers.
PHOTO 7 Spray Polyurethane Foam Roofing. A fluid-applied roofing membrane can be applied directly to the
ccSPF. The Louisiana Superdome was successfully repaired with this approach after Hurricane Katrina.
thermal control layer (Photo 4). They
need to have a water control layer
installed on their exterior.
How about insulated concrete
forms (ICFs)? They can act as the air
control layer, vapor control layer
and thermal control layer (Photo 5).
They need to have a water control
layer installed on their exterior or
a cladding such as polymer-based
stucco directly attached to their
50
ASHRAE JOURNAL
ashrae.org
exterior face, creating a barrier wall
mass assembly ( " High-Rise Igloos, "
ASHRAE Journal, April 2009).
Now let's look at spray polyurethane foam. When you spray closedcell, high-density spray polyurethane foam (ccSPF) on the exterior
of gypsum sheathing or plywood
or OSB, it can act as the water control layer, air control layer, vapor
control layer and thermal control
APRI L 2021
layer (Photo 6)-all four control layers ( " Exterior Spray Foam, " ASHRAE
Journal, November 2010). Works for
roofs as well-a fluid-applied roofing
membrane can be applied directly to
the ccSPF. The Louisiana Superdome
was successfully repaired with this
approach after Hurricane Katrina
(Photo 7) ( " How Not to Build Roofs, "
ASHRAE Journal, March 2008).
Open-cell, low-density spray foam
http://www.ashrae.org
ASHRAE Journal - April 2021
Table of Contents for the Digital Edition of ASHRAE Journal - April 2021
Contents
ASHRAE Journal - April 2021 - Intro
ASHRAE Journal - April 2021 - Cover1
ASHRAE Journal - April 2021 - Cover2
ASHRAE Journal - April 2021 - 1
ASHRAE Journal - April 2021 - Contents
ASHRAE Journal - April 2021 - 3
ASHRAE Journal - April 2021 - 4
ASHRAE Journal - April 2021 - 5
ASHRAE Journal - April 2021 - 6
ASHRAE Journal - April 2021 - 7
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ASHRAE Journal - April 2021 - Cover3
ASHRAE Journal - April 2021 - Cover4
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