products + Materials JOB #: TKE-8014 TITLE: DWLC Arch ... 09.pdf12 ArchitecturAl Products September...
Transcript of products + Materials JOB #: TKE-8014 TITLE: DWLC Arch ... 09.pdf12 ArchitecturAl Products September...
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65521cs_FHS_ArchRecrd.indd 1 8/20/09 9:45:21 PM
65521cs_FHS_ArchRecrd_1-1.pgs 08.20.2009 21:46 BLACK YELLOW MAGENTA CYAN
september 2009
T h e P r o d u c T P u b l i c a T i o n o f T h e u . S . a r c h i T e c T u r a l m a r k e T
achieving leed Research & Development FacilityNorthern Arizona University
project deconstruction Sheila C. Johnson Design Center
trend lines Acoustics and Sound Control
California State University, College of Education Building, San Bernardino, Calif.
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for higher educationproducts + Materials market of choice:
For a number of universities green design is translating to green cash as many grants are tied to LEED certification. Developers in public-private ventures, too, are realizing the ROI sustainably designed buildings can deliver.
Circle 135
ArchitecturAl Products September 2009
surface abrasion
indention resistance
soft body impact
hard body impact
clarifica-tion level
max. in. max. in. min ft-lbs min ft-lbs
1 0.126 0.150 90 50
2 0.059 0.100 195 100
3 0.010 0.050 300 150
Demand for healthier and safer schools that promote
better learning environments continues to rise during this
time of increased focus on sustainability. Specifying build-
ing materials for today’s new schools involves following
a set of stringent codes and standards, such as LEED for
Schools, GreenGuard, International Building Code (IBC)
and various municipal, state and federal building codes.
Generally speaking, GreenGuard certification of a
gypsum board or finishing product guarantees it has
low VOCs and helps contribute toward LEED for Schools’
Indoor Environmental Quality Credit. When specifying
gypsum sheathing and gypsum board products for school
construction, there are four main performance attributes
to evaluate—moisture and mold resistance, fire resistance,
abuse resistance, and acoustic control.
moisture & mold resistanceMoisture and mold protection help promote healthy indoor
air quality. Properly protecting a building from moisture
and the resulting mold growth starts with the exterior
walls, of which sheathing is an integral part. Manufactured
with a water- and fire-resistant core, gypsum sheathing is
versatile, economical and durable, and is designed for use
as a substrate under exterior wall claddings in any climate.
on spec
by Angie Allmon, MBA, CSI Product Manager for ProRoc products,
CertainTeed Gypsum, Tampa, Fla.
GypsumGoestotheHeadoftheClass
The natural noncombustible core of gypsum sheathing
protects the building from fires occurring outside the build-
ing, even when combustible siding covers the sheathing. In
addition, gypsum sheathing has a low flame spread rating
of less than 25. Where a minimum fire resistance rating
is desired or required, specifiers should refer to the UL or
ULC Fire Resistance Directories or GA-600 Fire Resistance
Design Manual for complete information on systems and
component parts used to achieve the necessary fire rating.
In the case of fire-resistance rated building design and
construction, however, the collective components of the
wall assembly determine the fire resistance rating, not the
individual products. CAN/ULC-S101 Fire Endurance Tests
of Building Construction and Materials and ASTM E 119
Standard Test Methods for Fire Tests of Building Construc-
tion and Materials require that fire endurance tests be
conducted on complete wall assemblies, not only on the
gypsum board itself.
Determining the type of assembly to specify will depend
on a variety of factors, such as the school capacity, number
of sprinklers, and number and location of exits.
abuse resistanceAs important as it is to protect our children from potential
building hazards, such as fire and mold, it’s important to
protect a building from its children and other occupants,
as well. Wherever there are children, there is potential
for a variety of abuse to the interior walls of a structure,
making abuse resistance a top concern for school walls.
The interior walls of a school are frequently subject to such
abuse as the abrasions of backpack buckles, writing imple-
ments, musical instrument cases and students bumping
up against the wall surface. To offer resistance to these
common occurrences, manufacturers in recent years have
developed abuse-resistant gypsum board products.
Abuse-resistant gypsum board is composed of a dense
gypsum core, reinforced by glass fiber, bound in heavy
weight 100% recycled paper. This combination affords
greater resistance to minimize scuffs, dents and scratches
while providing enhanced fire resistance. It is typically
specified in high-traffic areas, such as school corridors.
These abuse-resistant boards are tested for four catego-
ries, as per ASTM C 1629, which indicates how much abuse
and impact they can handle. See Table.
performanceGypsum boards are classified by performance in each of the
abuse categories. Classifications range from 1 to 3, with 3
providing the best performance in that particular category.
A higher classification in all categories is not always neces-
sary depending on the specific application. For example,
an area prone to scuffs and scratches would require
gypsum board with higher classification levels of surface
Hazelgrove Elementary School in Surrey, B.C., Canada
12
ASTMC1629PerformanceRequirements
In addition to fire protection, one of the main functions
of sheathing is to shield the building envelope from wet
weather during the phases of construction before the exte-
rior cladding is installed. The local climate and the project’s
time of year will dictate the length of time gypsum sheath-
ing may be left exposed. It should perform satisfactorily if
exposed to the elements for up to one month.
Enhanced gypsum board products, such as Certain-
Teed’s GlasRoc Exterior Sheathing, excel in such demanding
applications as schools and hospitals. They feature embed-
ded fiberglass mats for superior moisture and mold protec-
tion, an excellent choice when sheathing exposure times
are extended or the region has a moisture-heavy climate.
Moisture and mold protection is equally important in
the interior walls in schools. To reduce the risk of mold
growth, many gypsum board manufacturers treat the
paper on both sides with bio-inhibitors—chemicals that
fight off mold. Some manufacturers completely eliminate
paper in their products, replacing the paper faces with
moisture-resistant fiberglass mats. The current standard
for mold-resistant characteristics of gypsum board is
ASTM D 3273 Standard Test Method for Resistance to
Growth of Mold on the Surface of Interior Coatings in an
Environmental Chamber. This standard measures the
ability of the drywall product to resist mold and mildew
growth under certain prescribed moisture conditions.
fire resistanceFire resistance is a vital factor influencing many school
design specifications. A naturally fire-resistant mineral,
gypsum has become a leading construction material for
this purpose in the walls of schools. For enhanced fire resis-
tance, choose Type X or Type C gypsum board products,
which are modified to have more enhanced fire-resistive
properties than basic gypsum board.
Circle 43
abrasion and indentation resistance. Locations prone to
impact from children or objects, such as backpacks bump-
ing into the walls, however, will require gypsum board with
higher classification levels of soft- and hard-body impact.
It’s important to be aware of the application before specify-
ing minimum abuse requirements.
acoustic controlReducing sound transmission and speech intelligibility are
important in the learning environment. Students need to
be isolated from noisy hallways and adjacent classrooms
giving them a reasonably quiet environment for listening
and thinking.
According to the American National Standard Acoustical
Performance Criteria, Design Requirements, and Guidelines
for Schools, a minimum STC rating is required for single or
composite wall, floor-ceiling, and roof-ceiling assemblies
that separate either an enclosed core learning space or ancil-
lary space from an adjacent space.
To achieve higher STC requirements, wall and floor ceil-
ing designs should include such components as insulation,
resilient channels, heavier gypsum board or even spe-
cialty acoustic-dampening gypsum board products. Also,
planning of ceiling finishes to reduce reverberation in the
classroom will help students to hear their teachers and to
maintain a peaceful study environment.
an exampleLast year, British Columbia School District No. 36 hired Pro-
Can Construction Group Inc. of Burnaby, B.C., Canada, to
build Hazelgrove Elementary School in Surrey, B.C., which
will eventually serve 600 students. Pro-Can subcontracted
the sheathing, metal stud drywall, insulation, and acousti-
cal wall and ceiling installation to Phoenix Lath & Plaster
Ltd., of Surrey.
Phoenix Lath & Plaster installed 24,000 sq. ft. of Certain-
Teed GlasRoc exterior sheathing and applied spray foam
insulation between the sheathing and studs to break the
thermal bridging. Phoenix Lath & Plaster found the GlasRoc
sheathing easy to cut, and noticed fewer airborne fibers
during the process.
Construction completed on Hazelgrove Elementary
School in June, and it will accept students this September
for the 2009-2010 school year.
conclusionThere are many reasons gypsum board and sheathing
products are so prevalent in construction today, especially
with budget-conscious school boards. They give school
boards an excellent value, offering several sustainable
performance attributes for a more reasonable price than
competing materials. Use gypsum products on your next
school project, and go to the head of the class. m
The Cable Connection800-851-2961
775-885-2734 faxE-mail: [email protected]
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The Wagner Companies888-243-6914
414-214-0450 faxE-mail: [email protected]
www.wagnercompanies.com
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