ASHRAE Journal - February 2022 - 26

COLUMN BUILDING SCIENCES
CLIMATE
ZONE
4
5
R-7.5
R-7.5
6
7
8
R-11.25
R-10
R-15
R-15
R-20
TABLE 1 Insulation for condensation control adapted from Table R702.1 of the 2018 International Residential Code.
RIGID BOARD OR
AIR-IMPERMEABLE
INSULATION
R-3.5
R-5
R-5
TOTAL CAVITY
INSULATION
R-13
R-20
R-13
R-20
R-13
R-20
R-13
R-20
R-13
R-20
in Climate Zones 4 and higher during
the winter? It's not possible even in the
typical new house constructed to the
2021 International Energy Conservation
Code (IECC). We have enough trouble
maintaining these conditions in natatoriums,
art galleries and-wait for
it-hospitals. Houses will have to be
constructed to take the moisture stress
or we are going to kill the houses. And
that is for new houses. Retrofitting existing
houses will be a nightmare. Walls
are going to rot, and mold will become a
growth industry. Another bad pun. The
fire folks will be happy-houses will be
too wet to burn.
Folks are selling humidifiers all over
the place-health professionals are recommending
them.II Maybe we should
reconsider things a bit. Maybe not do
such a risky thing during the coldest part
of the winter in cold places.
Do you have any idea how unhealthy a
typical humidifier can become? I view
dirty ones as " bioweapons. " ASHRAE
knows humidifiers, but civilians do not.
Note that the Mayo Clinic recommends
distilled water. Yup, I see that all the
TOTAL WALL ASSEMBLY
INSULATION
R-16.5
R-25
R-18
R-27.5
R-20.5
R-31.25
R-28
R-35
R-28
R-40
RATIO OF RIGID BOARD INSULATION
OR AIR-IMPERMEABLE R-VALUE TO
TOTAL INSULATION R-VALUE
20%
20%
30%
30%
35%
35%
45%
45%
50%
50%
FIGURE 3 Controlling Interstitial Condensation.
Locate all the insulation on the exterior.
Cladding
Control Layers
Structure
FIGURE 4 Controlling Interstitial Condensation. No insulation in the wall cavity framing.
Brick Veneer/Stone Veneer
Drained Cavity
Exterior Rigid Insulation-Extruded Polystyrene, Expanded
Polystyrene, Isocyanurate, Rock Wool, Fiberglass
Membrane or Trowel-On or Spray-Applied Drainage
Plane, Air Barrier and Vapor Retarder
Non-Paper-Faced Exterior Gypsum Sheathing,
Plywood or Oriented Strand Board (OSB)
Uninsulated Steel Stud Cavity
Gypsum Board
Latex Paint or Vapor Semipermeable
Textured Wall Finish
Vapor Profile
IIThis old-school engineer has been reminded numerous times that I am not a health professional and should keep my opinion to myself,
but I look at my " Iron Ring " and beg to differ. Houses are not hospitals, and we have enough trouble with the design and construction of
hospitals as it is. I never get a call from hospital physical plant and maintenance folks saying, " Joe, things are great-come on down and
have a beer. "
26
ASHRAE JOURNAL ashrae.o rg
F E B R U A RY 2022

http://ashrae.org

ASHRAE Journal - February 2022

Table of Contents for the Digital Edition of ASHRAE Journal - February 2022

Contents
ASHRAE Journal - February 2022 - Intro
ASHRAE Journal - February 2022 - Cover1
ASHRAE Journal - February 2022 - Cover2
ASHRAE Journal - February 2022 - 1
ASHRAE Journal - February 2022 - Contents
ASHRAE Journal - February 2022 - 3
ASHRAE Journal - February 2022 - 4
ASHRAE Journal - February 2022 - 5
ASHRAE Journal - February 2022 - 6
ASHRAE Journal - February 2022 - 7
ASHRAE Journal - February 2022 - 8
ASHRAE Journal - February 2022 - 9
ASHRAE Journal - February 2022 - 10
ASHRAE Journal - February 2022 - 11
ASHRAE Journal - February 2022 - 12
ASHRAE Journal - February 2022 - 13
ASHRAE Journal - February 2022 - 14
ASHRAE Journal - February 2022 - 15
ASHRAE Journal - February 2022 - 16
ASHRAE Journal - February 2022 - 17
ASHRAE Journal - February 2022 - 18
ASHRAE Journal - February 2022 - 19
ASHRAE Journal - February 2022 - 20
ASHRAE Journal - February 2022 - 21
ASHRAE Journal - February 2022 - 22
ASHRAE Journal - February 2022 - 23
ASHRAE Journal - February 2022 - 24
ASHRAE Journal - February 2022 - 25
ASHRAE Journal - February 2022 - 26
ASHRAE Journal - February 2022 - 27
ASHRAE Journal - February 2022 - 28
ASHRAE Journal - February 2022 - 29
ASHRAE Journal - February 2022 - 30
ASHRAE Journal - February 2022 - 31
ASHRAE Journal - February 2022 - 32
ASHRAE Journal - February 2022 - 33
ASHRAE Journal - February 2022 - 34
ASHRAE Journal - February 2022 - 35
ASHRAE Journal - February 2022 - 36
ASHRAE Journal - February 2022 - 37
ASHRAE Journal - February 2022 - 38
ASHRAE Journal - February 2022 - 39
ASHRAE Journal - February 2022 - 40
ASHRAE Journal - February 2022 - 41
ASHRAE Journal - February 2022 - 42
ASHRAE Journal - February 2022 - 43
ASHRAE Journal - February 2022 - 44
ASHRAE Journal - February 2022 - 45
ASHRAE Journal - February 2022 - 46
ASHRAE Journal - February 2022 - 47
ASHRAE Journal - February 2022 - 48
ASHRAE Journal - February 2022 - 49
ASHRAE Journal - February 2022 - 50
ASHRAE Journal - February 2022 - 51
ASHRAE Journal - February 2022 - 52
ASHRAE Journal - February 2022 - 53
ASHRAE Journal - February 2022 - 54
ASHRAE Journal - February 2022 - 55
ASHRAE Journal - February 2022 - 56
ASHRAE Journal - February 2022 - 57
ASHRAE Journal - February 2022 - 58
ASHRAE Journal - February 2022 - 59
ASHRAE Journal - February 2022 - 60
ASHRAE Journal - February 2022 - 61
ASHRAE Journal - February 2022 - 62
ASHRAE Journal - February 2022 - 63
ASHRAE Journal - February 2022 - 64
ASHRAE Journal - February 2022 - 65
ASHRAE Journal - February 2022 - 66
ASHRAE Journal - February 2022 - 67
ASHRAE Journal - February 2022 - 68
ASHRAE Journal - February 2022 - 69
ASHRAE Journal - February 2022 - 70
ASHRAE Journal - February 2022 - 71
ASHRAE Journal - February 2022 - 72
ASHRAE Journal - February 2022 - Cover3
ASHRAE Journal - February 2022 - Cover4
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