Engineering Inc. - November/December 2019 - 10

THEPRIVATESIDE

Mass Timber Structures
May Transform Mid-Rise Market
By Erin McLaughlin

A

combination of factors, including
code changes, growing carbonconsciousness, and appreciation
for the warmth of wood, are
stacking up to make mass timber
structures the mid-rise building
of the future.
Mass timber refers to composite-wood systems that
combine multiple pieces of wood into larger structural
elements. The strength and applicability of mass
timber rivals concrete and steel, and in most structures
it is considered to have the same fire and safety risks as
buildings constructed with traditional materials.
In December 2018, the International Code Council
voted to loosen the International Building Code's
restrictions on structural wood. These changes allow
for buildings to be constructed up to 18 stories in
height, effective in 2021, with local code changes
likely to follow in the years to come. Current U.S.
building codes limit structural wood to five stories
in residential buildings and six stories in commercial
structures.
The use of mass timber began in Europe 20 years
ago and is more common in European countries,

as well as Canada and Australia. The world's tallest
wood structure, an 18-story structure completed
this past March in Norway, was constructed using
composite cross-laminated timber (CLT) material.
CLT was developed in the early 1990s and uses
lumber from smaller trees that are glued together
in perpendicular layers to form large, mass timber
panels. The fabrication of CLT is done in a controlled
factory environment before being sent to a jobsite.
The CLT process decreases wasted material and
increases productivity when compared with traditional
construction methods. Additionally, it puts the focus
on the preconstruction and planning phases, which
must be done with a high degree of accuracy. As a
result, most projects are constructed as a designbuild project, or similar arrangement, and have the
additional advantage being built 10 to 30 percent
faster, according to industry sources.
Because of the recent introduction of mass timber
structures in the U.S., developers, designers, and
constructors have a considerable learning curve. Many
building teams currently do not have the proper
tools and processes in place, and there is little costestimating history to use as a reference. In addition,

PROCESS OF MASS TIMBER STORING CARBON
Trees absorb CO2 from
atmosphere through
photosynthesis

Bioenergy

Recycling
the materials

End of life cycle
Wood turned into
products and
building materials

Wood products used
in buildings store
CO2 for their entire
life cycle reducing
greenhouse effect

Bioenergy
Sawdust, bark, branches, and treetops are
processed into pulp, heat, and bioenergy

10

ENGINEERING INC.

NOVEMBER / DECEMBER 2019

METSÄ WOOD

Pulp
Raw material
harvested from
sustainably
managed forest



Engineering Inc. - November/December 2019

Table of Contents for the Digital Edition of Engineering Inc. - November/December 2019

Engineering Inc. - November/December 2019
Contents
FROM ACEC TO YOU
MARKET WATCH
LEGISLATIVE ACTION
THE PRIVATE SIDE
STRATEGIC PLAN
2019 FALL CONFERENCE
STANDARD OF CARE
OPPORTUNITY AWAITS
TAKING A HARD STANCE
CREATING CONNECTIONS
2019 YOUNG PROFESSIONALS OF THE YEAR
ACEC RECOGNIZED FOR EXCELLENCE
MERGERS AND ACQUISITIONS
MEMBERS IN THE NEWS
Engineering Inc. - November/December 2019 - Intro
Engineering Inc. - November/December 2019 - Engineering Inc. - November/December 2019
Engineering Inc. - November/December 2019 - Cover2
Engineering Inc. - November/December 2019 - Contents
Engineering Inc. - November/December 2019 - 2
Engineering Inc. - November/December 2019 - 3
Engineering Inc. - November/December 2019 - FROM ACEC TO YOU
Engineering Inc. - November/December 2019 - 5
Engineering Inc. - November/December 2019 - MARKET WATCH
Engineering Inc. - November/December 2019 - 7
Engineering Inc. - November/December 2019 - LEGISLATIVE ACTION
Engineering Inc. - November/December 2019 - 9
Engineering Inc. - November/December 2019 - THE PRIVATE SIDE
Engineering Inc. - November/December 2019 - 11
Engineering Inc. - November/December 2019 - 12
Engineering Inc. - November/December 2019 - 13
Engineering Inc. - November/December 2019 - 14
Engineering Inc. - November/December 2019 - 15
Engineering Inc. - November/December 2019 - 16
Engineering Inc. - November/December 2019 - 17
Engineering Inc. - November/December 2019 - STRATEGIC PLAN
Engineering Inc. - November/December 2019 - 19
Engineering Inc. - November/December 2019 - 2019 FALL CONFERENCE
Engineering Inc. - November/December 2019 - 21
Engineering Inc. - November/December 2019 - 22
Engineering Inc. - November/December 2019 - 23
Engineering Inc. - November/December 2019 - 24
Engineering Inc. - November/December 2019 - 25
Engineering Inc. - November/December 2019 - STANDARD OF CARE
Engineering Inc. - November/December 2019 - 27
Engineering Inc. - November/December 2019 - 28
Engineering Inc. - November/December 2019 - 29
Engineering Inc. - November/December 2019 - OPPORTUNITY AWAITS
Engineering Inc. - November/December 2019 - 31
Engineering Inc. - November/December 2019 - 32
Engineering Inc. - November/December 2019 - 33
Engineering Inc. - November/December 2019 - TAKING A HARD STANCE
Engineering Inc. - November/December 2019 - 35
Engineering Inc. - November/December 2019 - 36
Engineering Inc. - November/December 2019 - 37
Engineering Inc. - November/December 2019 - CREATING CONNECTIONS
Engineering Inc. - November/December 2019 - 39
Engineering Inc. - November/December 2019 - 40
Engineering Inc. - November/December 2019 - 41
Engineering Inc. - November/December 2019 - 42
Engineering Inc. - November/December 2019 - 43
Engineering Inc. - November/December 2019 - 2019 YOUNG PROFESSIONALS OF THE YEAR
Engineering Inc. - November/December 2019 - 45
Engineering Inc. - November/December 2019 - ACEC RECOGNIZED FOR EXCELLENCE
Engineering Inc. - November/December 2019 - MERGERS AND ACQUISITIONS
Engineering Inc. - November/December 2019 - 48
Engineering Inc. - November/December 2019 - MEMBERS IN THE NEWS
Engineering Inc. - November/December 2019 - 50
Engineering Inc. - November/December 2019 - 51
Engineering Inc. - November/December 2019 - 52
Engineering Inc. - November/December 2019 - Cover3
Engineering Inc. - November/December 2019 - Cover4
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