ASHRAE Journal - August 2024 - 30
COLUMN BUILDING SCIENCES
FIGURE 4 Stem wall garage foundation insulation.
Exterior
Garage
Sealant, Adhesive
Or Gasket (typ.)
Cellular PVC
Rigid Insulation
(Taped or
Sealed Joints)
Sill Gasket
(Capillary Break)
PHOTO 5 Insulation detail at the stem wall
portion of the garage foundation.
PHOTO 6 Insulation detail at the stem wall
portion of the garage foundation.
exterior. Again, note that the wall assembly will need to meet the
applicable fire rating requirements.
OK, here comes the " Danger, Will Robinson. Danger! " issue. This
is not a minor issue. Garage spaces can be large sources of airborne
pollutants. Automobile exhaust is a major source of airborne
pollutants. Additionally garages are used for storage for materials that
are used for cleaning, snow melt, painting, etc. It is recommended
that mechanical ventilation is provided for attached garages.
The intent of installing exhaust fans in attached garages is to
depressurize the garage with reference to the occupied space
to reduce the risk of contaminants in the garage entering the
occupied space. The exhaust flows also reduce the concentration
of contaminants within the attached garage. The recommended
approach for one enclosed garage per dwelling unit is a 100 cfm
(47 L/s) ducted exhaust fan. It is also recommended that carbon
monoxide (CO) detectors and nitrogen oxide (NO2) detectors be
installed in attached garages. The minimum threshold should be set
at 25 ppm CO and 0.7 ppm NO2.
OK, more " Danger, Will Robinson. Danger! "
stuff. Mechanical air distribution systems
(forced air furnaces/AC units) and associated
ductwork should not be installed in attached
garages (Photo 8) due to the potential risk for
air leakage of such systems drawing air from
garages into occupied unit spaces unless
such systems are located within " air-sealed "
rooms (Photo 9) that are connected to the
occupied space.
PHOTO 7 Spray foam cavity insulation on the walls
separating the garage from the exterior. Again,
note that the wall assembly will need to meet the
applicable fire rating requirements.
PHOTO 8 Mechanical air distribution systems (forced
air furnaces/AC units) and associated ductwork
should not be installed in attached garages due to
the potential risk for air leakage of such systems
drawing air from garages into occupied unit spaces.
PHOTO 9 Mechanical systems should be located
within " air-sealed " rooms that are connected to the
occupied space. Note the automatic door closer for
the door to the occupied unit. Airtight door sweeps
and weatherstripping are necessary.
30
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ASHRAE Journal - August 2024
Table of Contents for the Digital Edition of ASHRAE Journal - August 2024
Contents
ASHRAE Journal - August 2024 - Intro
ASHRAE Journal - August 2024 - Cover1
ASHRAE Journal - August 2024 - Cover2
ASHRAE Journal - August 2024 - 1
ASHRAE Journal - August 2024 - Contents
ASHRAE Journal - August 2024 - 3
ASHRAE Journal - August 2024 - 4
ASHRAE Journal - August 2024 - 5
ASHRAE Journal - August 2024 - 6
ASHRAE Journal - August 2024 - 7
ASHRAE Journal - August 2024 - 8
ASHRAE Journal - August 2024 - 9
ASHRAE Journal - August 2024 - 10
ASHRAE Journal - August 2024 - 11
ASHRAE Journal - August 2024 - 12
ASHRAE Journal - August 2024 - 13
ASHRAE Journal - August 2024 - 14
ASHRAE Journal - August 2024 - 15
ASHRAE Journal - August 2024 - 16
ASHRAE Journal - August 2024 - 17
ASHRAE Journal - August 2024 - 18
ASHRAE Journal - August 2024 - 19
ASHRAE Journal - August 2024 - 20
ASHRAE Journal - August 2024 - 21
ASHRAE Journal - August 2024 - 22
ASHRAE Journal - August 2024 - 23
ASHRAE Journal - August 2024 - 24
ASHRAE Journal - August 2024 - 25
ASHRAE Journal - August 2024 - 26
ASHRAE Journal - August 2024 - 27
ASHRAE Journal - August 2024 - 28
ASHRAE Journal - August 2024 - 29
ASHRAE Journal - August 2024 - 30
ASHRAE Journal - August 2024 - 31
ASHRAE Journal - August 2024 - 32
ASHRAE Journal - August 2024 - 33
ASHRAE Journal - August 2024 - 34
ASHRAE Journal - August 2024 - 35
ASHRAE Journal - August 2024 - 36
ASHRAE Journal - August 2024 - 37
ASHRAE Journal - August 2024 - 38
ASHRAE Journal - August 2024 - 39
ASHRAE Journal - August 2024 - 40
ASHRAE Journal - August 2024 - 41
ASHRAE Journal - August 2024 - 42
ASHRAE Journal - August 2024 - 43
ASHRAE Journal - August 2024 - 44
ASHRAE Journal - August 2024 - 45
ASHRAE Journal - August 2024 - 46
ASHRAE Journal - August 2024 - 47
ASHRAE Journal - August 2024 - 48
ASHRAE Journal - August 2024 - 49
ASHRAE Journal - August 2024 - 50
ASHRAE Journal - August 2024 - 51
ASHRAE Journal - August 2024 - 52
ASHRAE Journal - August 2024 - 53
ASHRAE Journal - August 2024 - 54
ASHRAE Journal - August 2024 - 55
ASHRAE Journal - August 2024 - 56
ASHRAE Journal - August 2024 - 57
ASHRAE Journal - August 2024 - 58
ASHRAE Journal - August 2024 - 59
ASHRAE Journal - August 2024 - 60
ASHRAE Journal - August 2024 - 61
ASHRAE Journal - August 2024 - 62
ASHRAE Journal - August 2024 - 63
ASHRAE Journal - August 2024 - 64
ASHRAE Journal - August 2024 - 65
ASHRAE Journal - August 2024 - 66
ASHRAE Journal - August 2024 - 67
ASHRAE Journal - August 2024 - 68
ASHRAE Journal - August 2024 - 69
ASHRAE Journal - August 2024 - 70
ASHRAE Journal - August 2024 - 71
ASHRAE Journal - August 2024 - 72
ASHRAE Journal - August 2024 - Cover3
ASHRAE Journal - August 2024 - Cover4
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