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U.S. Department of Housing and Urban Development:
Offsite Construction for Housing: Research
Roadmap: https://www.huduser.gov/portal/portal/
sites/default/les/pdf/Offsite-Construction-for-
Housing-Research-Roadmap.pdf
Woodworks: https://www.woodworks.org/learn/
mass-timber-clt
WOOD FIBER INSULATION (ADVANCED
BUILDING MATERIALS CONTINUED)
The global insulation market size was estimated at
USD 52.18 billion in 2018 and is expected to expand
at a compounded annual growth rate (CAGR)
of 5.7% over the forecast period of 2019-2024.
Increasing consumer awareness regarding energy
conservation is estimated to propel the growth. In
the EIA 2019 Annual Energy Review, residential energy
consumption was estimated at 11.9 quadrillion BTUs,
accounting for 16% of the country’s total energy
consumption, with a residential unit (on average)
using over 50% of its total energy on space heating
and air conditioning. The EPA EnergyStar program
has identied that approximately 90% of homes
in the U.S. are under-insulated (representing
approximately 100 million housing units), and
estimates that insulating existing homes to meet
the 2012 International Energy Conservation Code
requirements and reducing air inltration by 25%
would lower the national total average residential
energy cost by 11%.
Wood ber insulation (WFI)-based products have
been produced and used in European countries,
mainly in Germany, Austria, and Switzerland,
since the mid-1990s. WFI is made in three forms, 1)
loose-ll, 2) batts, and 3) rigid boards. WFI, which
has grown into a 0.7 billion USD market in Europe,
is currently being imported into the U.S., but high
shipping costs have kept it an expensive niche
product. Emerging domestic manufacturing is
projected to make WFI a cost-neutral, drop-in
replacement for fossil-based insulation boards,
such as extruded/expanded polystyrene foam (XPS/
EPS). Wood ber insulation has better ecological
credentials, as well as several performance
advantages over the fossil-based conventional
insulation materials, including better sound
attenuation, and vapor openness. WFI also can
utilize a wide range of species, providing a critical
outlet for lower-value, underutilized species which
can have a positive impact on overall forest
health. Finally, WFI is a prime potential consumer of
residuals, which for many regions have found their
traditional outlets disappearing (e.g., paper chips,
pellets, biomass energy plants).
Inclusion of WFI into modular, panelized systems
holds great promise as an environmentally friendly,
energy-efcient, and cost-effective building
solution. Panelized construction is a building
practice whereby pre-engineered wall sections
are produced in factory-controlled conditions,
then shipped complete to the building site for nal
construction. Recently, the National Association
of Home Builders reported that complete home
panelization is the fastest growing segment of new
residential construction. Indeed, the Prefabricated
Modular Construction (PMC) market is projected
to grow at a 6.9% CAGR from 112.4 billion USD in
2019 to 153 billion USD by 2023. Not limited to only
metal building manufacturing, prefabricated wood
building in the United States brought in just over
$2 billion USD in annual revenue in 2011 and is
expected to surpass $4 billion USD in 2020.
Related to prefabricated and panelized construction,
the use of WFI is predicted to be a key component
in energy retrot applications. The global energy
retrot system market size was valued at 132.8
billion USD in 2019 and is anticipated to grow at
a CAGR of 4.1% from 2020 to 2027. The residential
segment, in particular, is anticipated to grow at a
substantial rate over the forecast period. Retrotting
helps homeowners control their energy bills, while
encouraging adoption of renewable energy retrot
systems, positively impacting the efforts to lower
the carbon footprint. The scale of the problem with
existing homes is staggering. Sixty-eight percent
of the current housing stock was built before 1990
when more robust energy efciency requirements
began appearing in building codes around the U.S.
It is estimated that 34.5 million homes have wood-
framed wall cavities with no insulation at all; millions
more have only 4 inches of insulation in 2×4 walls. Air
leakage is also a huge problem with 71% of homes
with leakage rates above 10 air changes per hour at
50 Pa (ACH50). For comparison, a new code-built
home might be 4-5 ACH50, while zero energy homes
routinely reach 1 ACH50.
GO Lab, Inc., a building products manufacturer
based in Belfast, Maine, is currently building the rst
WFI manufacturing facility in the U.S. in Madison
to demonstrate the market. Their wood ber
insulation is to be comprised of greater than 90%
softwood ber, will be renewable, recyclable, and
nontoxic, and is expected to meet all performance
requirements of common commercial construction
insulations. GO Lab staff attest their WFI will be
marketed and distributed at a cost-competitive
price. Once running at capacity, GO Lab’s production
facility in Maine will consume approximately 100,000
green tons of softwood chips annually, while
addressing just 0.6% of the U.S. insulation market.
Within ten years, GO Lab, Inc. hopes to expand,
adding ten to fteen additional plants throughout
the U.S. located near major markets. With this
expansion they project, conservatively, that they will
be able to attain 8%-10% market share.
Notable Institutions & Organizations
• Advanced Structures and Composites Center
(University of Maine)
• GO Lab Inc.
• Northern Forest Center
• University of Maine School of Forest Resources