Concrete inFocus - Fall 2017 - 33

the mass buffers indoor temperature fluctuations it also contributes
to improved occupant comfort.
The other benefit of ICF walls is that they are more air tight than
wood or steel frame construction. In many cases the air infiltration
rates are as low as 0.5 air changes per hour. Because there are no studs
to interrupt the insulation, thermal bridging is eliminated, further
improving energy performance. Another key factor in lowering construction cost is the ability to downsize the HVAC system. Energy
analysis and building owner experience suggest energy savings with
ICFs ranging from 20 percent to as much as 50 percent depending on
other energy efficiency strategies employed for the building.
When MEP engineering firm CMTA outgrew its office space, it
took the opportunity to design and build a state of the art headquarters. Its goals included demonstrating green technologies, consuming
minimal energy, earning LEED Gold certification and taking steps
toward becoming a net-zero energy building. The exterior bearing
walls of the new 20,000 square foot office building were built using
an ICF system to provide a superior thermal barrier and lower air
infiltration rates. Combining additional roof insulation and high
performance glazing resulted in a building that exceeds ASHRAE
90.1 by 20% and earned an Energy Star rating of 100. The design
team also accomplished its goal of achieving LEED Gold certification. CMTA employees are proud to be working in the building, and
it's also being used as an effective recruiting tool for new hires. The
building is also used by CMTA to demonstrate its high performance
building design expertise.
Enermodal Engineering designed and built its headquarters to
reflect the company's commitment to sustainability and to actively
demonstrate its green building design expertise. At the same time, it
wanted to maintain a quiet, comfortable and healthy environment
for employees. One of the ways the building achieved these goals was
by using an extremely air tight and well-insulated building envelope
comprised of ICFs along with insulation lined window openings and
triple-glazed windows with automated window shades. The 22,000
square-foot office building is reportedly Canada's most energy-efficient
office, using a metered 21.9 kBtu per square foot compared with
the Canadian average of more than 118.9 kBtu per square foot. The
building is the first LEED Canada Triple Platinum building with

Step 2: Then steel reinforcing is placed into the forms and secured
in place.
Step 3: Bracing and scaffolding are installed to keep the wall straight,
plumb and secure and to provide a working platform.
Step 4: Concrete is pumped into the forms.
Step 5: Electrical and plumbing lines are installed into the EPS by
cutting channels with a hot knife or other tool.
Step 6: Interior and interior finish is installed directly to the ICFs
by screwing into the embedded plastic furring strips.
When building multi-story buildings, the walls are generally erected
and cast one story at a time. Structural floors are installed and finished
before continuing with walls on the next level. There are also examples
of walls being placed several stories at a time and installing structural
slabs later. Some contractors have panelized ICF walls off site to further
reduce construction time. Others are beginning to use steel fibers in
place of horizontal shrinkage and temperature reinforcement which
can also significantly reduce construction time.
With these cost and schedule advantages, along with fire safety,
durability and energy efficiency, ICFs are quickly becoming the system
of choice for commercial construction of all types, including office
buildings, schools, hospitality and institutional buildings.

Office Buildings

Case Study: CMTA Headquarters, Louisville, Kentucky.

PHOTO COURTESY OF NUDURA AND ENERMODAL ENGINEERING

PHOTO COURTESY OF NUDURA AND CMTA CONSULTING ENGINEERS

Many office buildings are owner occupied so operating efficiency,
low maintenance and long-term value are key attributes for a building
system. That's why many building owners are turning to ICFs. The
low cost and reduced construction schedule of ICFs are attractive,
but the fact that ICF buildings offer the most energy efficient design
option is a key factor in selecting ICFs. In addition, owner/tenants
often like to offer their employees healthy buildings and demonstrate
their commitment to sustainability by achieving LEED certification.
The energy codes IECC and ASHRAE 90.1 consider ICFs to be
mass walls with continuous insulation. Typical whole wall ICF assemblies have an R-value ranging from R-24 to R-26 or even higher depending on the manufacturer. Because thermal mass reduces temperature
swings and delays heat transfer, there are fewer spikes in temperature
inside an ICF building. Thermal mass shifts energy demand to offpeak hours when utility rates are lower, reducing costs further. Since

Case Study: Enermodal Engineering Headquarters, Kitchener, Ontario.
concrete INFOCUS

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33



Table of Contents for the Digital Edition of Concrete inFocus - Fall 2017

From the President’s Desk
Corporate Suite
Enviroscene
2017 National Ready Mixed Concrete Association Fleet Benchmarking and Costs Survey
The Root Causes of Poor Communication
Insulating Concrete Forms for Commercial Construction
Engineering: Specifying for Performance
View from Capitol Hill: State of Play of U.S. Infrastructure
2017 Service & Supply Buyers’ Guide
2017 Products & Services Suppliers Guide
Index of Advertisers
Concrete inFocus - Fall 2017 - Intro
Concrete inFocus - Fall 2017 - bellyband1
Concrete inFocus - Fall 2017 - bellyband2
Concrete inFocus - Fall 2017 - cover1
Concrete inFocus - Fall 2017 - cover2
Concrete inFocus - Fall 2017 - 3
Concrete inFocus - Fall 2017 - 4
Concrete inFocus - Fall 2017 - 5
Concrete inFocus - Fall 2017 - 6
Concrete inFocus - Fall 2017 - 7
Concrete inFocus - Fall 2017 - 8
Concrete inFocus - Fall 2017 - From the President’s Desk
Concrete inFocus - Fall 2017 - 10
Concrete inFocus - Fall 2017 - Corporate Suite
Concrete inFocus - Fall 2017 - 12
Concrete inFocus - Fall 2017 - 13
Concrete inFocus - Fall 2017 - Enviroscene
Concrete inFocus - Fall 2017 - 15
Concrete inFocus - Fall 2017 - 16
Concrete inFocus - Fall 2017 - 17
Concrete inFocus - Fall 2017 - 2017 National Ready Mixed Concrete Association Fleet Benchmarking and Costs Survey
Concrete inFocus - Fall 2017 - 19
Concrete inFocus - Fall 2017 - 20
Concrete inFocus - Fall 2017 - 21
Concrete inFocus - Fall 2017 - 22
Concrete inFocus - Fall 2017 - 23
Concrete inFocus - Fall 2017 - 24
Concrete inFocus - Fall 2017 - 25
Concrete inFocus - Fall 2017 - The Root Causes of Poor Communication
Concrete inFocus - Fall 2017 - 27
Concrete inFocus - Fall 2017 - 28
Concrete inFocus - Fall 2017 - 29
Concrete inFocus - Fall 2017 - Insulating Concrete Forms for Commercial Construction
Concrete inFocus - Fall 2017 - 31
Concrete inFocus - Fall 2017 - 32
Concrete inFocus - Fall 2017 - 33
Concrete inFocus - Fall 2017 - 34
Concrete inFocus - Fall 2017 - 35
Concrete inFocus - Fall 2017 - 36
Concrete inFocus - Fall 2017 - 37
Concrete inFocus - Fall 2017 - 38
Concrete inFocus - Fall 2017 - 39
Concrete inFocus - Fall 2017 - Engineering: Specifying for Performance
Concrete inFocus - Fall 2017 - 41
Concrete inFocus - Fall 2017 - 42
Concrete inFocus - Fall 2017 - 43
Concrete inFocus - Fall 2017 - View from Capitol Hill: State of Play of U.S. Infrastructure
Concrete inFocus - Fall 2017 - 45
Concrete inFocus - Fall 2017 - 46
Concrete inFocus - Fall 2017 - 2017 Service & Supply Buyers’ Guide
Concrete inFocus - Fall 2017 - 48
Concrete inFocus - Fall 2017 - 49
Concrete inFocus - Fall 2017 - 50
Concrete inFocus - Fall 2017 - 2017 Products & Services Suppliers Guide
Concrete inFocus - Fall 2017 - 52
Concrete inFocus - Fall 2017 - Index of Advertisers
Concrete inFocus - Fall 2017 - 54
Concrete inFocus - Fall 2017 - cover3
Concrete inFocus - Fall 2017 - cover4
Concrete inFocus - Fall 2017 - OC1
Concrete inFocus - Fall 2017 - OC2
Concrete inFocus - Fall 2017 - OC3
Concrete inFocus - Fall 2017 - OC4
Concrete inFocus - Fall 2017 - OC5
Concrete inFocus - Fall 2017 - OC6
Concrete inFocus - Fall 2017 - OC7
Concrete inFocus - Fall 2017 - OC8
Concrete inFocus - Fall 2017 - OC9
Concrete inFocus - Fall 2017 - OC10
Concrete inFocus - Fall 2017 - OC11
Concrete inFocus - Fall 2017 - OC12
Concrete inFocus - Fall 2017 - OC13
Concrete inFocus - Fall 2017 - OC14
Concrete inFocus - Fall 2017 - OC15
Concrete inFocus - Fall 2017 - OC16
Concrete inFocus - Fall 2017 - OC17
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