Short answer

Prioritize local sourcing of wood and investigate the use of lighter wood species when designing with or manufacturing CLT to reduce its environmental impact.

Field: Sustainability
Source: Sustainability (2019)
Method: Life Cycle Assessment (LCA)
Evidence: Strong effect

Optimizing the location of lumber suppliers and selecting lighter wood species for cross-laminated timber (CLT) production can significantly decrease its global warming potential. This sustainability research insight is drawn from a 2019 study published in Sustainability. Using Life cycle assessment (lca), researchers explored how this design variable affects real-world outcomes. The key design takeaway: Prioritize local sourcing of wood and investigate the use of lighter wood species when designing with or manufacturing CLT to reduce its environmental impact.

Study

SustainabilityHigh ImpactStrong effect

Local sourcing and lighter wood species can reduce CLT's GWP by up to 14%

Optimizing the location of lumber suppliers and selecting lighter wood species for cross-laminated timber (CLT) production can significantly decrease its global warming potential.

Sustainability · 2019

Key Findings

01The proximity of lumber suppliers to CLT manufacturing facilities is a significant factor in the total environmental impacts of CLT production.
02The wood species mix used for lumber has a substantial impact on the GWP of CLT panels.
03Switching from heavier species like Douglas-fir to lighter species like Sitka spruce can lead to significant reductions in GWP.
04By sourcing lumber locally and utilizing lighter wood species, CLT mills can achieve up to a 14% reduction in the overall GWP of their panels.

Application

Design takeaway

Prioritize local sourcing of wood and investigate the use of lighter wood species when designing with or manufacturing CLT to reduce its environmental impact.

How to apply

When specifying or producing CLT, actively seek out local lumber suppliers and evaluate the GWP differences between various wood species available in your region.

Project actions

01When researching materials for your design project, look into their full life cycle impacts, not just their performance.
02Consider the geographical location of your material suppliers and how that affects the environmental cost of your design.

Method & Evidence

AimTo assess the cradle-to-gate environmental impacts of Cross-Laminated Timber (CLT) production in Western Washington, specifically examining the influence of transportation logistics and wood species mix on Global Warming Potential (GWP).

MethodLife Cycle Assessment (LCA)

ProcedureA cradle-to-gate LCA was developed for CLT produced in Western Washington, considering five potential sawmills and two hypothetical CLT mills. The study analyzed the impact of varying lumber supplier locations relative to CLT manufacturing facilities and different wood species mixes (Douglas-fir vs. Sitka spruce) on the overall GWP.

ContextBuilding materials, Wood products industry, Sustainable construction

Variables

IV["Location of lumber suppliers","Wood species mix"]

DV["Global Warming Potential (GWP) of CLT"]

CV["CLT production process","Mill location (hypothetical)","Region (Western Washington)"]

Strengths & Limitations

Strengths

+Provides a region-specific LCA for CLT.
+Quantifies the impact of logistics and material mix on GWP.

Limitations

The study's findings are specific to Western Washington and may not be directly transferable to other regions with different timber availability and logistics.

Reliability & validity

The study's validity is strengthened by its use of a recognized methodology (LCA) and its focus on specific, quantifiable variables. Reliability would depend on the consistency of the data inputs and assumptions used in the LCA model.

Think critically

How might the findings of this study be affected by different transportation infrastructures or by the availability of different wood species in other geographical regions?

Design Principles

"Minimize transportation distances and select materials with lower embodied energy to reduce the overall environmental footprint of a product."

This research highlights that the environmental footprint of CLT is not solely determined by the material itself, but also by the logistical choices and material composition. Designers and manufacturers can leverage these findings to make more informed decisions, leading to demonstrably greener building products.

What This Means for Your Design

Making CLT locally and using lighter wood can make it much better for the environment.

How to use in your project

1.Reference this study when discussing the environmental impact of material choices in your design project, particularly if using wood-based products.

Add to My Project

Quick Cite

Paragraph starter

This research demonstrates that the environmental impact of Cross-Laminated Timber (CLT) is significantly influenced by its production logistics and material composition. By prioritizing local sourcing of lumber and selecting lighter wood species, manufacturers can achieve notable reductions in Global Warming Potential (GWP), with potential reductions of up to 14% observed in the study's regional context.

Source

Sustainability

Life Cycle Assessment (LCA) of Cross-Laminated Timber (CLT) Produced in Western Washington: The Role of Logistics and Wood Species Mix

journal · 2019

View source

Questions About This Research

What does the research say about local sourcing and lighter wood species can reduce clt's gwp by up to 14%?: Prioritize local sourcing of wood and investigate the use of lighter wood species when designing with or manufacturing CLT to reduce its environmental impact. Evidence: Sustainability (2019).
Why does "Local sourcing and lighter wood species can reduce CLT's GWP by up to 14%" matter for design?: This research highlights that the environmental footprint of CLT is not solely determined by the material itself, but also by the logistical choices and material composition. Designers and manufacturers can leverage these findings to make more informed decisions, leading to demonstrably greener building products.
How can designers apply this research?: Prioritize local sourcing of wood and investigate the use of lighter wood species when designing with or manufacturing CLT to reduce its environmental impact.
What were the main findings?: The proximity of lumber suppliers to CLT manufacturing facilities is a significant factor in the total environmental impacts of CLT production.. The wood species mix used for lumber has a substantial impact on the GWP of CLT panels.. Switching from heavier species like Douglas-fir to lighter species like Sitka spruce can lead to significant reductions in GWP.. By sourcing lumber locally and utilizing lighter wood species, CLT mills can achieve up to a 14% reduction in the overall GWP of their panels.
What research method was used?: Life Cycle Assessment (LCA).
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2019 journal from Sustainability.
What should I do differently in my next project?: When specifying or producing CLT, actively seek out local lumber suppliers and evaluate the GWP differences between various wood species available in your region.
What are the limitations?: The study focused on a specific region (Western Washington) and did not cover the entire life cycle of CLT (e.g., construction, use, and end-of-life).