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Wood Design Tools & Calculators
The Canadian Wood Council (CWC) offers simple, easy-to-use, and free design tools to help architects, engineers, and builders work more efficiently with wood. From electronic design calculators to practical construction guides, our resources make wood design more accessible and straightforward.
CWC offers a number of free resources available to wood professionals as well as wood enthusiasts.

Climate zone-appropriate insulated wall assembly solutions that are easily comparable with national and provincial energy efficiency prescriptive provisions.

Calculate load-carrying capacity for wood beams efficiently. Provides quick, code-compliant results for safe and reliable designs.

Dimension Calculator
Easily convert lumber dimensions for accurate planning. Ideal for ensuring precise cuts and minimizing waste.

Estimate lumber volume for your projects. Simplify material planning and cost estimation with accurate results.

Carbon Calculator
Both the amount of carbon stored and the amount of greenhouse gas emissions avoided.

Code CHEK
Ensure your designs meet safety standards. Verify compliance with the latest building codes for hassle-free projects.

FRR & STC Tool
Evaluate fire resistance and sound performance. Optimize designs to meet safety and acoustic standards easily.

Bolt Selection Table Viewer
Evaluate fire resistance and sound performance. Optimize designs to meet safety and acoustic standards easily.

Bolt Calculator
Performs design calculations for bolted connections in accordance with CSA O86:24 Clause 12.4.
The Canadian Wood Council’s Design Tools have been developed for information purposes only. Although all possible efforts have been made to ensure that the information on these tools is accurate, the CWC cannot under any circumstances guarantee the completeness, accuracy or exactness of the information. Reference should always be made to the appropriate Building Code and/or Standard. This tool should not be relied upon as a substitute for legal or design advice, and the user is responsible for how the tool is used or applied.
Explore Additional Tools
Expand your design capabilities with advanced tools tailored for timber construction. From calculators to performance modeling, these resources enhance your workflow for precise and efficient project execution.

Cecobois Online Tools
Climate zone-appropriate insulated wall assembly solutions that are easily comparable with national and provincial energy efficiency prescriptive provisions.

AWC Online Tools
Discover innovative tools designed to streamline your wood construction projects. Optimize design processes and explore solutions crafted for modern timber engineering.

Discover the WoodWorks® Software
Learn how the WoodWorks Software supports design and construction professionals with expert resources, tools, and free technical support for innovative wood building projects.
Explore Premium
Content and Resources
From best practices to innovative techniques, find everything you need to succeed in timber construction.
OTTAWA, ON, 1 APR 2025 – The Canadian Wood Council (CWC) is pleased to announce the release of five new Environmental Product Declarations (EPDs) for Canadian softwood lumber, oriented strand board (OSB), plywood, trusses, and prefabricated wood I-joists. These EPDs provide comprehensive, transparent environmental data on the potential impacts associated with the cradle-to-gate life cycle stages of these essential wood products.
Developed as regionalized, industry-wide business-to-business (B2B) Type III declarations, the EPDs comply with the highest international standards, including ISO 21930, ISO 14025, ISO 14040, ISO 14044, the governing product category rules, and ASTM General Program Instructions for Type III EPDs. This ensures credible, third-party verified environmental impact data, supporting designers, builders, and policymakers in making informed, sustainable material choices.
“The release of these new EPDs reinforces our commitment to transparency and sustainability in the wood products sector,” said Peter Moonen, National Sustainability Manager at the Canadian Wood Council. “By providing robust, science-based environmental information, we’re equipping the industry with the tools needed to demonstrate the environmental benefits of wood and support low-carbon construction.”
The EPDs are available for download from the Canadian Wood Council’s digital resource hub: www.cwc.ca
Stakeholders within the building design and construction community are increasingly being asked to include information in their decision-making processes that take into consideration potential environmental impacts. These stakeholders and interested parties expect unbiased product information that is consistent with current best practices and based on objective scientific analysis. In the future, building product purchasing decisions will likely require the type of environmental information provided by environmental product declarations (EPDs). In addition, green building rating systems, including LEED®, Green Globes™ and BREEAM®, recognize the value of EPDs for the assessment of potential environmental impacts of building products.
EPDs are concise, standardized, and third-party verified reports that describe the environmental performance of a product or a service. EPDs are able to identify and quantify the potential environmental impacts of a product or service throughout the various stages of its life cycle (resource extraction or harvest, processing, manufacturing, transportation, use, and end-of-life). EPDs, also known as Type III environmental product declarations, provide quantified environmental data using predetermined parameters that are based on internationally standardized approaches. EPDs for building products can help architects, designers, specifiers, and other purchasers better understand a product’s potential environmental impacts and sustainability attributes.
An EPD is a disclosure by a company or industry to make public the environmental data related to one or more of its products. EPDs are intended to help purchasers better understand a product’s environmental attributes in order for specifiers to make more informed decisions selecting products. The function of EPDs are somewhat analogous to nutrition labels on food packaging; their purpose is to clearly communicate, to the user, environmental data about products in a standardized format.
EPDs are information carriers that are intended to be a simple and user-friendly mechanism to disclose potential environmental impact information about a product within the marketplace. EPDs do not rank products or compare products to baselines or benchmarks. An EPD does not indicate whether or not certain environmental performance criteria have been met and does not address social and economic impacts of construction products.
Data reported in an EPD is collected using life cycle assessment (LCA), an internationally standardized scientific methodology. LCAs involve compiling an inventory of relevant energy and material inputs and environmental releases, and evaluating their potential impacts. It is also possible for EPDs to convey additional environmental information about a product that is outside the scope of LCA.
EPDs are primarily intended for business-to-business communication, although they can also be used for business-to-consumer communication. EPDs are developed based on the results of a life cycle assessment (LCA) study and must be compliant with the relevant product category rules (PCR), which are developed by a registered program operator. The PCR establishes the specific rules, requirements and guidelines for conducting an LCA and developing an EPD for one or more product categories.
The North American wood products industry has developed several industry wide EPDs, applicable to all the wood product manufacturers located across North America. These industry wide EPDs have obtained third-party verification from the Underwriters Laboratories Environment (ULE), an independent certification body. North American wood product EPDs provide industry average data for the following environmental metrics:
- Global warming potential;
- Acidification potential;
- Eutrophication potential;
- Ozone depletion potential;
- Smog potential;
- Primary energy consumption;
- Material resources consumption; and
- Non-hazardous waste generation.
Industry wide EPDs for wood products are business-to-business EPDs, covering a cradle-to-gate scope; from raw material harvest until the finished product is ready to leave the manufacturing facility. Due to the multitude of uses for wood products, the potential environmental impacts related to the delivery of the product to the customer, the use of the product, and the eventual end-of-life processes are excluded from the analysis.
For further information, refer to the following resources:
- ISO 21930 Sustainability in buildings and civil engineering works – Core rules for environmental product declarations of construction products and services
- ISO 14025 Environmental labels and declarations – Type III environmental declarations – Principles and procedures
- ISO/TS 14027 Environmental labels and declarations – Development of product category rules
- ISO 14040 Environmental management – Life cycle assessment – Principles and framework
- ISO 14044 Environmental management – Life cycle assessment – Requirements and guidelines
- American Wood Council
- Canada Green Building Council
- Green Globes
- BREEAM®
- Annual Review Rules and Form EPD
Buildings that stand the test of time aren’t just durable—they are cherished. When we invest in quality materials and good design, we can create buildings that people connect with. As you’ll discover in this issue, many heavy timber warehouses and factories constructed in the early 1900s remain a vital part of our cities today—not because they still serve their original purpose, but because people valued them enough to adapt, restore, and reuse them, giving them a new purpose.
Fast forward a hundred years and resilient structures include many new forms. Modular construction, for example, has seen significant growth in recent years as this form of construction has transformed from a building method once considered inferior, into a method relied upon to deliver high-performance durable buildings.
Alongside our features on historic timber buildings and modular construction, this issue also highlights notable projects and emerging trends shaping today’s built environment. From innovative mass timber structures to forward-thinking design solutions, we explore how thoughtful craftsmanship and smart engineering continue to define the spaces we build—and the ones we keep.
- The construction environment is a dynamic weather and exposure environment that can range from dry to cold and wet to dry. Wood materials are in a constant state of moisture content change with the environment that affects dimensional change, corrosion activity, fungi and decay, and the tension of embedded screws. The presentation includes some of the new provisions of CSA O86:24 related to mass timber screws and the Simpson Strong-Tie R&D work to understand and mitigate HE as affected by hardness, manufacturing, and use environments. Credits: Participants will earn one professional development hour (PDH). After completing the post-webinar online quiz, you can earn 0.1 continuing education unit (CEU) as well. Attendee Prerequisites: Some experience in this field is helpful. Intended Audience: Structural engineers, specifiers, architects, building officials, residential & commercial contractors, home owners and DIYers. We’ll have a live Q&A at the end. Learning Objectives: Identify the importance of managing the construction environment surrounding fasteners driven through thick steel plates into wood. Describe the effect of wood moisture content on the tension of threaded fasteners embedded in wood. Explain how to prevent HE failures in the construction environment. Summarize the provisions of CSA O86:24 related to mass timber fastening. Incorporate installation provisions for mass timber fasteners driven through thick metal plates into wood.
- With recent Code changes resulting in more stringent seismic requirements, finding efficient and high-performing structural layouts is more important than ever. It is expected that Light-Wood Frame residential mid-rise buildings will be the most affected by these changes. WoodWorks is teaming up with Weyerhaeuser and Simpson Strong-Tie for an engaging educational event to explore strategies to meet these increased requirements. This is a unique opportunity to participate in a discussion with suppliers, educators, and researchers on the direction of the industry. Have your voice heard! Learning Outcomes: Analyze the most recent Code developments and how they affect the lateral design of light wood-frame mid-rise buildings. Review typical lateral layouts and strategies to mitigate increased seismic forces Explore different analysis methods and their effect on lateral force distribution. Discover alternate shearwall designs and how to review the construction of different solutions.
OTTAWA, March 25, 2025 – The Canadian Wood Council welcomes the Government of Canada’s announcement of over $20 million in funding for 67 projects that support the growth and resilience of British Columbia’s forest sector.
While the announcement includes several strategic large-scale investments in advanced wood manufacturing, a significant strength of this initiative lies in the breadth of smaller-scale, high-impact projects that are collectively transforming communities across the province. From feasibility studies for Indigenous-led forest product businesses to the development of next-generation building technologies, these projects are advancing wood innovation, supporting workforce development, and expanding the role of wood in low-carbon construction.
Administered through Natural Resources Canada, this Green Construction through Wood (GCWood) funding supports a wide range of initiatives—from fire-testing mass timber connections and refining modelling guides for timber structures, to developing bioenergy solutions and value-added wood processing in Indigenous communities.
This announcement underscores the importance of decentralized innovation, where targeted investments in communities and research institutions alike contribute to a stronger, more sustainable forest sector. The Canadian Wood Council applauds this commitment and looks forward to continuing its work with design professionals, governments, and industry partners to support the expanded use of wood in the province through its market-leading WoodWorks program.
View the announcement from Natural Resources Canada here:
https://www.canada.ca/en/natural-resources-canada/news/2025/03/canada-announces-support-for-british-columbias-forest-sector.html https://www.canada.ca/en/natural-resources-canada/news/2025/03/canada-announces-support-for-british-columbias-forest-sector.html
- This session provides a thorough exploration of the key factors affecting floor system performance. Participants will gain insights into how to identify and address these factors through effective design strategies that can be used to produce engineered wood floor systems with exceptional reliability and long-lasting performance. Learning Objectives: Identify key factors that influence floor system performance. Analyze how these factors impact the performance and durability of floor systems. Apply effective design strategies to overcome floor system performance challenges and improve reliability. Ensure consistent results and long-term floor system performance.
OTTAWA, March 24, 2025 – The Canadian Wood Council (CWC) applauds the joint investment of over $8.5 million by Natural Resources Canada and Quebec’s Ministry of Natural Resources and Forests in four innovative wood construction-related projects across Quebec. These strategic initiatives will help strengthen the manufacturing sector and accelerate the adoption of low-carbon, Canadian-made wood products and technologies in residential construction and other critical community infrastructure.
By supporting advanced wood construction methods—including modular mass timber housing, artificial intelligence to modernize engineered wood manufacturing, and the design of tall wood residential buildings—this investment reinforces the essential role of wood in delivering high-performance, low-carbon construction solutions. From a 20-unit modular development and a 21-storey design study to the cultural leadership of the Cree First Nation of Waswanipi in forest-to-form construction, these projects demonstrate how innovative wood technologies can meet urgent housing needs in a sustainable way, through scalable and repeatable, locally driven approaches.
The Canadian Wood Council commends both levels of government for recognizing the critical role of Canada’s forest sector in delivering smart, climate-friendly building systems. These investments demonstrate how advanced wood technologies can contribute to addressing urgent housing needs while helping to lower the carbon footprint of the built environment.
Design and construction professionals in Quebec can access free technical support related to wood design and construction through the market-leading resource program, Cecobois. The CWC is pleased to provide support further expand the use of wood in residential, commercial, and institutional buildings throughout the rest of Canada through its WoodWorks program.
View the announcement from Natural Resources Canada here:
https://www.canada.ca/en/natural-resources-canada/news/2025/03/canada-and-quebec-invest-in-sustainable-wood-construction.html
OTTAWA, ON, 21 MAR 2025 – The Canadian Wood Council (CWC) applauds the Government of Canada’s strategic investment in Nova Scotia’s mass timber sector, recognizing its role in advancing low-carbon construction, economic growth, and job creation.
This funding will accelerate the fabrication of high-value mass timber components from undervalued eastern spruce, unlocking new opportunities for Canada’s forest sector and expanding the use of advanced wood materials in construction. By supporting the production of Cross-Laminated Timber (CLT) and Glulam in Nova Scotia, this investment strengthens supply chains, creates skilled jobs in the region, and enhances the competitiveness of low-carbon building solutions across Canada.
Mass timber is increasingly recognized as a proven strategy for the rapid construction of much-needed housing and other critical infrastructure. Its benefits extend across multi-residential and commercial buildings, offering a scalable, efficient, and sustainable approach to modern construction.
Canada’s forest sector is well-positioned to meet the growing domestic demand for sustainable construction materials. This investment will drive innovation in mass timber manufacturing, creating economic opportunities in Nova Scotia while enhancing Canada’s capacity to produce and supply mass timber products nationwide. Expanding domestic production advances low-carbon building solutions and strengthens Canada’s wood manufacturing sector.
The CWC applauds this commitment to fostering a resilient and competitive mass timber industry in Atlantic Canada. Through our WoodWorks technical program, we look forward to supporting construction professionals with the knowledge and resources they need to integrate mass timber into more projects across the country.
View the announcement from Natural Resources Canada here: https://www.canada.ca/en/natural-resources-canada/news/2025/03/canada-invests-in-nova-scotias-local-mass-timber-industry.html
- Discover the innovative approach to housing supply undertaken by Pathway Non-Profit Community Developments Inc. of Peel. The Arbor Mill expansion sets a remarkable precedent for other non-profit affordable housing providers who want to build more housing and can do it by adding additional units on top of their existing buildings. Globally, it is estimated that approximately 20-25% of existing buildings can support a vertical addition in wood, which is a comparatively light weight building material. This novel approach removes the need to find new land to develop and has the added benefit of immediately integrating new residents into an existing supportive community. This project added 6 barrier-free, affordable apartments on top of a 35-year old, occupied residential building using prefabricated mass timber, delivering more affordable housing through the “gentle densification” of existing infrastructure. In this webinar, the project team will discuss the architectural, structural, and design challenges of the project, including blending prefabricated mass timber construction methods with an older structure built with conventional materials. Key sustainability and construction considerations will also be highlighted. Don’t miss this opportunity to gain valuable insights from one of the first project teams in North America to pursue this innovative approach to housing delivery. Learning Outcomes: Participants will learn how Pathway, a non-profit community developer in Peel Region, created a plan to expand its housing portfolio while addressing tenant needs and priorities. Participants will gain insights into the design and approval challenges of the project, including navigating site plan approvals, integrating mass timber, and meeting acoustic and fire safety requirements. Participants will understand the structural considerations for vertical expansions, which include performing load assessments and evaluating structural options. Participants will understand the mass timber fabricator’s process and the key considerations for successfully integrating prefabricated mass timber components into a project, including early involvement, securing production spots, and managing construction timelines.
The Canadian Wood Council is proud to share the National Lumber Grades Authority (NLGA) latest updates to the design values for Hem-Fir (N) dimension lumber, effective April 1, 2025. These changes result from a routine reassessment of strength and stiffness properties, ensuring Hem-Fir (N) continues to meet structural performance expectations.
Key Points:
- Minimal Practical Impact: The updated design values should not result in significant changes to the practical use of Hem-Fir (N) in most applications, maintaining continuity for builders, designers, and engineers.
- Consistent Performance: Hem-Fir (N) remains a trusted and dependable choice for residential and commercial construction, with values that closely align with previous standards.
- No Impact on Existing Construction: Structures built under previous building codes remain compliant.
- The updates are reflected in the NLGA Standard Grading Rules for Canadian Lumber, CSA O86 – Engineering Design in Wood, and the National Design Specification® (NDS®) Supplement for Wood Construction.
For additional details, including specific design value changes, affected lumber grades, and implementation considerations, please refer to the Frequently Asked Questions (FAQ) document for Canada or the USA.
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Some engineered wood panel products, such as plywood and laminated veneer lumber (LVL) are able to be treated after manufacture with preservative solutions, whereas thin strand based products (OSB, OSL) and small particulate and fibre-based panels (particleboard, MDF) are not. The preservatives must be added to the wood elements before they are bonded together, either as a spray on, mist or powder.
Products such as OSB are manufactured from small, thin strands of wood. Powdered preservatives can be mixed in with the strands and resins during the blending process just prior to mat forming and pressing. Zinc borate is commonly used in this application. By adding preservatives to the manufacturing process it’s possible to obtain uniform treatment throughout the thickness of the product.
In North America, plywood is normally protected against decay and termites by pressure treatment processes. However, in other parts of the world insecticides are often formulated with adhesives to protect plywood against termites.