ASHRAE Journal - July 2021 - 49

COLUMN BUILDING SCIENCES
PHOTO 1 Build as high as you can-the higher the
better.
PHOTO 2 In coastal areas, the first level should be
used for parking and storage.
PHOTO 3 Raise HVAC equipment above the base
flood elevation (BFE) to prevent damage.
First, the obvious. All fl ood risk
is reduced when the building's
fl oors are located above the base
fl ood elevation (BFE) and when the
slope of the land directs water away
from the building. Raised slab and
elevated pier foundations tend to
be more robust and lower risk than
slab foundations and crawlspace
foundations. Let me repeat-with all
foundation approaches, fl oors should
be constructed above the base fl ood
elevation (BFE) with the grade sloping
away from the building (Figure 1a,
Figure 1b and Figure 1c). Build as high
as you can-the higher the better. In
coastal areas, the fi rst level should
be used for parking and storage
(Photo 1 and Photo 2).
Raise HVAC equipment above
the BFE to prevent damage (Photo
3). Raise electrical components
(switches, sockets, circuit breakers
and wiring) at least 12 in. (305 mm)
above the BFE to reduce damage to
the electrical system and the chance
of fi re from short circuits.
Figure 2 illustrates the use of concrete
masonry unit (CMU) block to
create a " raised slab foundation. " The
fi rst-fl oor assembly is also masonry
Joseph W. Lstiburek, Ph.D., P.Eng., is a principal of
Building Science Corporation in Westford, Mass. Visit
www.buildingscience.com.
FIGURE 2 Concrete Masonry Unit (CMU) Assembly. The first-floor assembly is masonry internally insulated with
non-water sensitive rigid insulation. The second floor is wood framed with continuous exterior rigid insulation
and an insulated frame wall cavity. The roof assembly is a traditional vented attic.
Soil Gas Stack Vented Through Flashed Roof Penetration
Roof
Ceiling Insulation
Vent Baffl e
Vent Space
Purlins
Fully Adhered Roof Membrane
Roof Sheathing
Tile Roof
Continuous Soffi t Vent
Polymer Modifi ed (PM) or Standard
Portland Cement Stucco
Paper Backed Lath
Building Paper, House Wrap, or
Building Wrap
Drainage Mat
OSB Sheathing
Membrane Strip Covering Wood
Frame/Masonry Intersection Under
Weep Screed Flashing
Weep Screed Flashing Tucked
Under Building Paper, House Wrap,
Or Building Wrap
Polymer Modifi ed (PM) or Standard
Portland Cement Stucco
Masonry Wall
Weep Screed/Capillary Break/
Termite Shield for Stucco Rendering
Over Polyethylene
Parge Coat Damp-Proofed With
Latex Paint to Reduce Water
Absorption
Ground Slopes Away From Wall
At 5% (6 in. Per 10 ft)
Sealant
2×6 24 in. o.c. Advanced Framing
Gypsum Board Caulked, Glued or
Gasketed to Bottom Plate
Cavity Insulation
Sealant
Unfaced Cavity Insulation
Sealant at All
Penetrations
Flashing
Attic Ventilation
Through Continuous
Ridge Vent
Soil Gas
Ventilation Stack
Horizontal Fire Stop
Gypsum Board With Latex Paint or
Other Permeable or Semipermeable
Interior Finish, Held Up From Slab
Vertical Wood Furring
Rigid Insulation
" Seat " in Concrete to Receive
Masonry Block
Concrete Slab
Polyethylene Vapor Barrier
Sealant at All
Penetrations
Perforated Drain Pipe Added
To " T " to Couple Sub-Slab
Pressure Field to Vent Stack
Sub-Slab Stone Layer (No Fines)
Fill Perimeter of Stem Wall With Concrete
Concrete Footing
J U LY 2 0 2 1 ashrae.org ASHRAE JOURNAL
49
http://www.buildingscience.com 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
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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
ASHRAE Journal - July 2021 - 39
ASHRAE Journal - July 2021 - 40
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ASHRAE Journal - July 2021 - 48
ASHRAE Journal - July 2021 - 49
ASHRAE Journal - July 2021 - 50
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ASHRAE Journal - July 2021 - 71
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ASHRAE Journal - July 2021 - 73
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ASHRAE Journal - July 2021 - Cover3
ASHRAE Journal - July 2021 - Cover4
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