ASHRAE Journal - July 2021 - 53

COLUMN BUILDING SCIENCES
F IGURE 9 Controlling Hydrostatic Pressure. The crawlspace
must control flood water by ensuring flood waters enter and
exit the crawlspace without resulting in hydrostatic pressure
differences.
f
o
Floor of House
FIGURE 10 Cavity Insulation with Vapor Barrier. The foil facing on the rigid insulation addresses the
vapor drive.
Any Type of Flooring/Floor Finish
Floor Sheathing (OSB or Plywood)
Air Space
Exterior
Flood Level
Protection Board
Interior
Flood Level
FIGURE 11 Crawlspace Perimeter. The rigid insulation also needs to be airtight. The seams should
be sealed with foil tape.
Wood Siding (All Surfaces Painted)
Crawlspace
Foundation
Wall
f
o
Floor of House
Ground
Air Space
0.5 in. OSB Sheathing
Furring
Sealant, Adhesive or Gasket
Adhesive
Exterior
Flood Level
Interior
Flood Level
Crawlspace Vent at
Top of Foundation Wall
Crawlspace Foundation Wall
Opening
Crawlspace
Foundation
Wall
Ground
Sealant, Adhesive or Gasket
Protection Board
Batt Insulation
Rigid Insulation (Fire Rated, Taped and
Sealed Joints)
Capillary Break
Unfaced Cavity Insulation, Cellulose or
Low-Density Spray-Applied Foam Insulation
Gypsum Board With Permeable (Latex) Paint
Sealant, Adhesive or Gasket
Sealant at Corner of Bottom Plate and Subfl oor
Or Gasket Under Bottom Plate
Sealant (Typ.)
Rigid Insulation
Gasket
Foil-Faced
Isocyanurate
Cavity Insulation
Flood Vent at Grade
Now on to the " problem child " foundation-crawlspaces.
As mentioned many
times previously ( " Crawlspaces: Either In or
Out, " ASHRAE Journal, January 2020), there
are two common crawlspace foundation
approaches. The crawlspace is " vented " and
" not conditioned " and connected to the " outside. "
Or the crawlspace is " not vented " and
" conditioned " and connected to the " inside. "
Not vented conditioned crawlspaces are not
Ground Slopes Away From
Wall at 5% (6 in. Per 10 ft)
Concrete Footing Below Frost Depth
J U LY 2 0 2 1 ashrae.org ASHRAE JOURNAL
53
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http://www.ashrae.org

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
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ASHRAE Journal - July 2021 - 24
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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
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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
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ASHRAE Journal - July 2021 - 49
ASHRAE Journal - July 2021 - 50
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ASHRAE Journal - July 2021 - 53
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ASHRAE Journal - July 2021 - Cover3
ASHRAE Journal - July 2021 - Cover4
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