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Residential Prescriptive Exterior Wood Deck Span Guide

The intent of this document is to provide guidance on joist spans, built-up beam sizes, and supporting column sizes for exterior wood decks. The following items which are typically included in an exterior wood deck are not addressed and are beyond the scope of this document: deck footings; deck railings and guards; attachment of the deck to houses; lateral bracing of a deck. Design tables are provided for lumber which is not incised (Tables 2a, 2b, 4a, 4b, 6a and 6b) and lumber which is incised (Tables 3a, 3b, 5a, 5b, 7a and 7b). Tables are provided in both metric and imperial units.

Shear Testing of Cross-Laminated Beams

This testing program was carried out by the Advanced Building Systems (ABS) Department of FPInnovations in response to a request made by Mrs. Julie Frappier of Nordic Engineered Wood and Mr. Étienne Lalonde of Canadian Wood Council (CWC) for the evaluation of the shear stress resistance of one hundred fifty two (152) cross-laminated timber (CLT) beams. All specimens were manufactured by Nordic Engineered Wood and delivered to FPInnovations’ testing facilities in Québec City. The main objective of this study was to evaluate the in-plane shear stress of CLT depending of its orientation and the number of plies. Specific Gravity and Moisture Content measurements were also determined for each specimen.

Wood Innovation and Design Centre

With a height of 29.5 metres, the Wood Innovation and Design Centre (WIDC) is the tallest contemporary wood building in North America. Located in the city of Prince George in northern British Columbia, the WIDC was conceived as a showcase for local wood products and as a demonstration of the province’s growing expertise in the design and construction of large wood buildings.

The building has eight levels (six storeys, plus a ground floor mezzanine and a rooftop mechanical penthouse). The lower levels will accommodate faculty and students enrolled in the new Master of Engineering in Integrated Wood Design (MEng), to be launched by the University of Northern British Columbia (UNBC) in January 2016 and the new Centre for Design Innovation and Entrepreneurship to be launched by Emily Carr University of Art and Design in fall 2016. Academic facilities include a research/teaching lab that will support the design, fabrication and testing of wood products; a 75-seat lecture theatre; classrooms; a student lounge; gathering and meeting areas; and a learning resource centre. The upper floors will provide office space for public and private sector organizations associated with the wood industry.

Over the long term, the WIDC will advance wood education and innovation in the province, enhance expertise in wood manufacturing, product development and engineering – all of which will help to expand opportunities for international exports of products and services. In addition, its striking presence in the heart of the city will assist in the revitalization of downtown Prince George.

This case study describes the most important innovations that were implemented to meet design and safety criteria in what is a new class of buildings for British Columbia. These innovations included:

A set of site-specific regulations to ensure life safety and structural integrity;

The use of vertical cross-laminated timber (CLT) elements (including mechanical, elevator and stair shafts) to provide lateral stability to the structure;

The use of double layer CLT floors to meet structural requirements and contribute to acoustic isolation and efficient services distribution;

The use of superimposed (end grain-to-end grain bearing) columns to control shrinkage over the height of the building; and,

The use of high strength proprietary connectors to speed construction and improve structural performance.

Permanent Wood Foundations 2016

Wood Design Awards 2015

CLT Diaphragm Properties

A testing program related to the evaluation of the mechanical properties of CLT diaphragms used in construction was carried out by the Advanced Building Systems (ABS) Department of FPInnovations in response to a request made by the Client, Nordic Engineered Wood Products. The main objective of this study was to determine the in-plane stiffness and potentially strength properties of CLT panels used in diaphragm applications. The test matrix consisted of three (3) series of two (2) specimens each. The CLT specimens were tested under third-point loading during the program. All specimens were manufactured by Nordic Engineered Wood Products and delivered to FPInnovations’ testing facilities in Québec City. The CLT panels were made of nominal 2×4 Black Spruce lumber (CLT Grade E1 – ANSI PRG 320).

Shear Modulus of CLT in plan loading

A testing program was carried out by the Advanced Building Systems (ABS) Department of FPInnovations in response to a request made by Mrs. Julie Frappier of Nordic Engineered Wood Products for the evaluation of the effective shear modulus of eight (8) different Cross-laminated Timber (CLT) configurations or series. The test matrix consisted of a total seventy (70) specimens and each specimen was submitted to four (4) bending tests, resulting in a total two hundred and eighty (280) tests. All specimens were manufactured by Nordic Engineered Wood Products and delivered to FPInnovations’ testing facilities in Québec City.

Monotonic Quasi-Static Testing of CLT Connections

This testing program was carried out by the Advanced Building Systems (ABS) Department of FPInnovations in response to a request from Mrs. Julie Frappier from Nordic Engineered Wood for the evaluation of the mechanical properties of three (3) different assemblies for attaching Cross Laminated Timber (CLT) panels. Each of the assemblies consisted of six (6) specimens for a total of eighteen (18) tests. All specimens were manufactured by Nordic Engineered Wood and delivered to FPInnovations’ laboratory in Québec City.

The key objective was to evaluate the mechanical properties pertinent for the design of CLT panel connections exposed to in-plane loading such as diaphragms or shear walls. The evaluation of the ultimate loading capacity (𝐏𝐮𝐥𝐭) and the stiffness (K) of the connections are thus the main focus of this study.

Fire Safety Design In Buildings

In a recent survey of building specifiers, the majority perceived wood to be the most environmentally friendly building material. Compared to other major building materials, this is due mainly to:

  • the renewability of wood
  • the low energy consumption required for production
  • the low levels of pollutant emission during manufacture

Lately, environmental considerations have acquired more importance in the specification of materials. Technical and economic aspects of building materials have always been primary considerations for specifiers. Increasingly, however, they are considering the environmental effects when selecting appropriate building materials for their designs.

Architects, engineers and designers require accurate information to assess the true environmental consequences of the materials they specify.

The environmental impacts of various building materials have been examined by a Canadian Research Alliance using the internationally accepted method called Life-Cycle Analysis (LCA). The Alliance consists of researchers from the wood, steel and concrete industries as well as university groups and consultants.

BP5 – Wood-Frame Construction: Meeting The Challenge of Earthquakes

North American single-family homes are considered by many to be the safest place to be in an earthquake. This is not surprising considering that North American housing is almost synonymous with wood-frame construction. The lightweight and high energy absorbing capabilities of wood framing provides a system strong enough to withstand the effects of powerful earthquakes. Experience from strong earthquakes, in North America and around the world, has shown that well-constructed wood-frame buildings provide safety to their occupants.

BP4 – Wood-Frame Housing: A North-American Marvel

North Americans enjoy the highest standard of safe and comfortable housing in the world. This is not by chance – wood-frame construction is the residential building system of choice and many countries wishing to improve the comfort and security of their citizens are adopting it.

North America is blessed with resources of all kinds. A continuing abundance of forest resources has, since the earliest settlers, encouraged using wood to build housing.

Today, as designers, builders and homeowners pursue safe, energy efficient housing that is easy on the environment and can perform in the face of major challenges like high winds and earthquakes, there are stronger reasons than ever to build with wood.

Wood-frame construction is strong, durable, easy to insulate, easy to renovate and delivers value. It is backed by two hundred years of proven performance and a wealth of research and new product development to make it better than ever. And it is the only major building material that is renewable.

Strong winds… heavy snow loads… high humidity… extreme temperatures – whatever your building challenges, wood-frame housing has proven technical solutions to overcome any problem.

Wood sells houses. In addition to the shelter, warmth and safety provided by the wood structure, buyers recognize and appreciate the aesthetic value of wood for exposed applications like cabinetry, flooring, furniture and moldings.

Not only is wood builder-friendly, it is also environmentally friendly. Wood products take less energy to manufacture, affect the environment less than other materials, and they come from North American forests that are abundant and increasing in size.

BP3 – Termite Control and Wood-Frame Buildings

Wood products have long been the building materials of choice for home construction in North America. The wood-frame construction system has a solid history of producing housing of the highest standards: It is easy to build, delivers economic value, has excellent strength in earthquake or high-wind conditions, is energy efficient, and is derived from a renewable resource. Modern wood-frame construction includes several types of engineered wood products that are economically viable in multi-story residential buildings and non-residential projects. Moreover, as described in Bulletins No. 1 and 2 in the Building Performance Series, wood framing supplies durability and fire safety performance where environmental and building code requirements are met. This bulletin describes how wood framing can also be used in areas of North America subject to insect attack, a threat to all types of buildings. It builds on the concept of integrated pest management that will provide long-term protection for wood-frame and other buildings against damage caused by insects, specifically Formosan and other subterranean termites. Also included is practical advice for building designers, contractors and owners to assist in assessing risk, and choosing appropriate mitigation measures.

Innovative Wood Use in BC – A Case Study Showcasing Three Demonstration Projects
...projects benefited from BC provincial funding support through the Wood Enterprise Coalition (WEC) demonstration project program. WEC was put in place under the province’s Wood First Initiative,1 and has a...
Living with Lakes Centre
...an extraordinary building with an exceptionally low environmental footprint. The project makes extensive use of wood products harvested and manufactured close to Sudbury, including structural, framing and decorative wood products....
Long-term Care Facilities – Norview Lodge & Parkwood Mennonite Home
...safe, cheery, and bright, and yet economical to construct and maintain. Wood construction offers many advantages—for example, wood-frame construction is economical, and wood finishes and exposed wood members offer architectural...
Meadows Community Recreation Centre and Library
...indoors and outdoors maximizes natural light and materials to create a warm and inviting atmosphere. Wood is used throughout as both a structural and finish material. Because wood is a...
Microtel Inn & Suites – Parry Sound, Ontario
...project’s architect, designed this three-storey building using wood for all structural framing. Prefabricated wood panels designed specifically for the project were used to complete this cost effective, high quality, and...
Mid-Rise Construction In British Columbia – A Case Study Based on The Remy Project In Richmond, BC
Modern six-storey light-frame wood construction in British Columbia (BC) incorporates highly-detailed, researched and safe solutions. the engineering technology being adapted in the province is positioning BC at the forefront of...
Mountain Equipment Co-op Head Office – Vancouver, BC
...four million members and annual sales of more than $300 million. With each new building project, MEC has endeavoured to advance its own sustainability agenda, and in this respect wood...
Operations Centre – Gulf Islands National Park Reserve
...ease of installation and local availability, the glulam provides interior ambience for the exposed structure. Wood-frame walls are used for a large proportion of the exterior walls and western red...
Rock Community Church – Planned for Growth
Rock Community Church is located in Woodbridge, Ontario, directly north of Toronto. Several years ago, the congregation bought a large, wooded property and used an existing residence and outbuildings for...
Social Services Administration Board – The District of Thunder Bay
...The building is wood post and beam construction with woodframe floors and infill walls. Glulam columns were left exposed. This aesthetically pleasing expression of the structure, combined with wood millwork...
Origine – Pointe-Aux-Lièvres Ecocondos – Quebec City
...Nordic Structures, EBC, and Synchro Immobilier, wanted to push the boundaries of wood materials. Origine’s great innovation resides in its lateral resistance system made entirely of wood. It is actually...
Templar Flats – Hamilton, ON
Templar Flats in Hamilton, Ontario, has the distinction of being the first occupied, modern wood-frame mid-rise building completed in Ontario. It was constructed under provisions (O. Reg. 191.14) added to...
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