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IBS1 – Moisture and Wood-Frame Buildings

Throughout history, wherever wood has been available as a resource, it has found favor as a building material for its strength, economy, workability and beauty, and its ability to last has been demonstrated again and again. From the ancient temples of Japan and China and the great stave churches of Norway to the countless North American and European buildings built in the 1800s, wood construction has proven it can stand the test of time. The art and technology of wood building, however, has been changing through time.

It’s a common misconception that water is wood’s enemy. That’s not necessarily true, since many wood buildings exist in rainy and humid places. It’s a matter of knowing how to manage water in buildings. Protection of buildings from water is the important design criterion, as important as protection from fire or structural collapse. Designers, builders and owners are gaining a deeper appreciation for the function of the building envelope (exterior walls and roof). This includes the performance of windows, doors, siding, sheathing membranes, air and vapour barriers, sheathing, and framing. The capabilities and characteristics of wood and other construction materials must be understood, and then articulated in the design of buildings, if proper and durable construction is to be assured. Wood and water are typically very compatible. Wood can absorb and release large quantities of moisture without problems, and it’s only when wood gets too wet for too long that there may be problems. If buildings are properly constructed to shed water, wood performs well as a building material in all types of climates. As an example, 90% of North American homes are built with wood. The primary focus of this publication is to address the control of rainwater penetration in exterior walls, which is the major source of moisture issues for all building materials, particularly in climates subject to high rainfall.

ONTARIO WOOD BRIDGE REFERENCE GUIDE

Timber bridges have a long history of construction and use throughout North America, including Ontario, for roadways, railways and logging roads. The Canadian Highway Bridge Design Code (CHBDC), together with the Canadian Wood Council publication Wood Highway Bridges from 1992 are typically referenced by designers of timber bridges in Ontario. This new reference is intended to provide updated background information for designers as they embark on proposing and designing timber highway bridges for primary and secondary roads. This reference is divided into three parts:

Part 1 – Wood Bridges – Design and Use

Part 2 – Opportunities & Current Limitations

Part 3 – Design Examples

Part 1 provides background information on topics including wood materials, bridge systems, prefabrication, durability and species availability. Details of costs, construction cycle and sustainability are also provided. Part 1 concludes with examples of a variety of completed highway bridges from North America and Europe.

Part 2 of this reference is intended to provide designers and authorities with highlights of the current edition of the CHBDC on subjects related to the wood highway bridges, including areas that will require future development in the code. Additional references to other resources for advancing practitioner knowledge of and advancing the state of the art in wood bridge design are provided.

Part 3 has two fully worked design examples of a two-lane 18-m span wood highway bridge designed in accordance with the latest provisions of the CHBDC and the best available information from current literature. Each example is based on a single-span, simply-supported glued-laminated girder bridge. One bridge has a glued-laminated deck and the other has a stress-laminated deck. These examples are intended to help designers understand the key issues as they undertake wood highway bridge design. Durability through detailing and choice of materials is discussed.

BP6 – MANAGING MOISTURE AND WOOD

Wood, a long-lasting, economical, and renewable resource, is the building material of choice in North American housing. This is largely due to the proven performance of properly designed and built wood frame buildings that have provided strong and lasting housing for a multitude of people. Although wood can withstand much abuse, it needs to be stored and handled properly to perform according to expectations. Managing moisture in structural wood products is essential in order to control swelling and shrinkage and prevent problems associated with mold or decay.

Surrey Memorial Hospital Critical Care Tower – Surrey, BC

Just as our definition of green building has expanded with time so has our understanding of human health expanded to include not only our physical condition but also our psychological well-being. We have known intuitively for a long time that humans have an affinity for nature, and being in a natural environment—a forest, a park or simply our own garden—can make us feel more relaxed.

The term ‘biophilia’ has been coined to refer to this phenomenon. Scientists have now confirmed that this sensation of relaxation in the presence of nature is the result of a physiological change, a reduction in the level of stress-related hormones produced by our body’s sympathetic nervous system (SNS). Using an approach known as ‘evidence-based design’ (in which detailed analyses of occupant responses to a building’s physical characteristics are used to inform the design of future projects), healthcare architects have begun to explore the physiological benefits of biophilia in the design of indoor environments. This has led to the greater use of natural daylight, access to views of nature, and the introduction of wood and other natural materials into healthcare facilities.

Wood in particular is visually warm and contributes to a socially positive experience for building occupants. People respond emotionally to wood and are attracted to its visual variety and natural expressiveness. A study carried out by the University of British Columbia and FPInnovations1 confirms the value of these attributes. The joint research project found that the visual presence of wood in a room lowers SNS activation in occupants, further establishing the positive link between wood and human health.

Timmins Library & Judy A. Shank Integrated Services Building

The City of Timmins has a population of 45,000 but due to its location in northeastern Ontario, is a regional service centre for 100,000 people. It had become obvious that two major community services were in drastic need of improvement. The existing library, built in 1921, had served long and well but needed more space to provide a stimulating learning environment and more room for new technology so vital for engaging young people. The Canadian Mental Health Coalition, providing a range of social services for the community, needed more space to adequately provide assistance in the region.

The forest products sector is a vital part of the heritage, culture and economy of Timmins. For this reason, the City of Timmins wished, wherever economically justifiable, to incorporate wood products into the structure and appearance of the Library. In addition, there were obvious benefits to combining the library with the needs of the Coalition Centre offices of the Canadian Mental Health Coalition, funded by the Province of Ontario, and agreement was reached on combining these two buildings. The Coalition Centre has been named the Judy A. Shanks Integrated Services Building. The resulting landmark facility (Figure 1) is centrally located in Timmins, and with ample parking and barrier-free access, welcomes all the city’s and region’s residents.

UBCO Fitness and Wellness Centre – University of British Columbia Okanagan Campus

The University of British Columbia – Okanagan (UBCO) is located in the south-central community of Kelowna in BC’s interior. UBCO’s student community numbers just over 8,300 undergraduate and graduate students, 20 per cent of whom currently live on campus. UBCO strives to provide a vibrant campus life for its students. This is particularly important for resident students as the campus is located at a significant distance from activities in downtown Kelowna. UBCO’s Athletics and Recreation Department manages recreational needs on campus. It has been operating out of facilities initially built in 1994 to accommodate less than half of the current student population. The athletic competition venues on campus still meet a very high standard, but fitness and recreation facilities were lacking. A storage area in the existing gymnasium complex was converted into a weight room and cardio workout area in an effort to provide added services but a permanent solution was needed for the ever increasing number of memberships to the facility. Following the receipt of a substantial private donation for the express purpose of building a new fitness centre on the UBCO campus, UBC Properties Trust held a design-build competition for the new building. The donor stipulated two conditions for the facility: it needed to have an aviation theme, and it had to demonstrate innovative wood construction.

Hamilton and Oyster River Fire Halls – Richmond and Comox, BC

The use of wood for the construction of fire halls has always been a viable option within the BC Building Code and is further supported by the fact that wood is a regionally based material.

The critical code requirement for buildings of this type is that they must be designed to post disaster standards, but need not be of non-combustible construction. In the two examples of fire halls showcased here, the extensive shear wall systems that are an essential component of post-disaster construction have been simply and economically constructed using built up wood members, tie downs and plywood sheathing.

The challenges come with the coordination of each discipline: architectural, structural, mechanical and electrical to position wood shear walls and structural components so that they become attributes to the design and so that services can run uninterrupted without compromising the post disaster standards.

The use of wood in these conditions has always served as well or better than other materials as wood is readily available and most trades are familiar with its installation and inherent properties.

Fire Chief Niels Holbek of Oyster River Fire Rescue noted that, “Wood provided a cost effective option for the construction of the hall to post disaster standard. (With) metal cladding on the exterior and the roof, drywall on the interior and a monitored alarm system concerns about fire and life safety are minimal. Whether subject to fire, earthquake or other natural forces, wood structures tend not to fail in the dramatic way that some other types of structures can.”

Innovating with Wood – A Case Study Showcasing Four Demonstration Projects

The success of the University of British Columbia’s (UBC) Earth Sciences programs resulted in a need for the department to expand in order to accommodate a growing enrollment of 360 major/honours students, 170 graduate students, and more than 6,400 undergrads each semester. As a university with a history of leadership in the advancement of earth, ocean and atmospheric sciences, the use of wood for the construction of the UBC’s Earth Sciences Building (ESB) complemented the relationship between environment and science.

The new 5-storey north wing of the ESB will house the academic research, lecture, and office spaces at UBC’s Point Grey Campus in Vancouver. Unlike the 5-storey concrete laboratory wing, the academic wing uses wood as the primary structural material because of its architectural qualities and value as a renewable resource. Located along Main Mall, an important north/south artery on campus, the ESB project is exposed to high volumes of pedestrian traffic. Directly across the street from the ESB is the new Beaty Biodiversity Museum, which, together with the nearby Pacific Museum of the Earth, forms an inspiring collection of buildings and features that showcase wood in construction for both the university and public at large. Securing UBC’s position as a global leader in earth, ocean and atmospheric sciences, the ESB is a centre of discovery and learning that embodies the impressive academic and physical scope of the UBC campus.

When complete, the academic wing of the ESB will include offices, lecture theatres and graduate workspaces. It will also have a resource cluster on the 5th floor that will serve as a mini-conference facility and incorporate some of the latest technologies to create a flexible learning environment, making the ESB expansion a project that encourages collaboration in both design and academic functionality. The laboratory wing will be dedicated to labs and lab preparation areas, and will also have office space.

Innovative Wood Use in BC – A Case Study Showcasing Three Demonstration Projects

This document includes case studies on the Elkford Community Conference Centre, the North Shore Credit Union Environmental Learning Centre and the City of North Vancouver Civic Centre Renovation. All three 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 mandate to help bring newly developed technologies, as well as innovative uses of new and traditional wood products, to the marketplace. The emphasis is on commercial viability of non-traditional solutions, in particular, innovations in commercial and institutional buildings.

The three projects in the current case study were selected by the demonstration project program by virtue of their innovative structural or architectural applications of wood-based products, including but not limited to the use of cross-laminated timber systems or other premanufactured components and systems, and wood components that serve multiple functions.

Living with Lakes Centre

Sudbury, Ontario, located at the edge of a large geological structure known as the Sudbury Basin (a 1.85-billion-year-old meteorite impact crater), is home to Canada’s largest mining and smelting complex. By the 1970s, decades of mining and smelting nickel, copper and iron had reduced some 10,000 hectares of the surrounding area to desolation and had damaged watercourses for miles around. Sudbury is still a rich mining centre, but, as a result of a 90 % reduction in emissions and aggressive land reclamation, it has become a world centre for environmental science issues related to mining.

Working for years from four cabins, the Cooperative Freshwater Ecology Unit – a research joint venture involving Laurentian University, the Ontario Ministry of the Environment and the Ontario Ministry of Natural Resources – needed a new home to expand its specialized research into the protection, remediation, and restoration of freshwater lakes and ecosystems.

The resulting Vale Living with Lakes Centre for Freshwater Restoration vastly increases the Cooperative’s research capabilities. The major funders of the project included Industry Canada (Knowledge and Infrastructure Program), Ministry of Training Colleges and Universities, Vale – a global mining company, FedNor, Canada Foundation for Innovation, Ontario Research Fund, and the Northern Ontario Heritage Fund Corporation.

The Centre provides researchers and technicians access to laboratories, classrooms, offices, environmental bays and a watershed restoration facility. At the Centre, researchers examine long-term effectiveness of pollution reduction, and how a damaged lake ecosystem is able to dynamically heal itself over time.

As well as being a centre of excellence for critically important ecological research, the Vale Living with Lakes Centre is 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

Canada’s ageing population means an increasing demand for more facilities dedicated to providing care for elderly citizens. Facility operators and residents are looking for accommodations and services that are accessible, 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 appeal and warmth. This Case Study provides information for two long-term care facilities recently constructed in Ontario, Canada. Both these projects exemplify the ambiance and features that operators and residents are seeking.

Located in Simcoe, Ontario, Norview Lodge long-term care facility accommodates 179 residents in a rural setting reminiscent of the farming background familiar to many of the residents. Set on a large site (Figure 1) at the edge of a natural Carolinian forest, the building’s wood structure and cladding allow it to fit easily into its rustic setting. Low in scale with large, sheltering roofs, the building reflects the modest, agricultural buildings of the area while providing an interior residential atmosphere.

At the conceptual design stage, several options were presented to the client, Norfolk County, including a high-rise of noncombustible construction. It was desired that the new facility reflect the agricultural heritage of the area, be moderate in cost, be low-scale in profile, and make best advantage of the views from the site. As a result, two-storey wood-frame construction was selected.

Meadows Community Recreation Centre and Library

Located in a fast-growing area of south-east Edmonton, the new Meadows Community Recreation Centre, and associated Meadows Branch Edmonton Public Library, provides year round recreational and cultural opportunities for the surrounding neighbourhoods.

Design began in February 2010 and the facility was opened to the public in November 2014. Planning focused on creating relationships between indoor and outdoor programs. Transparency between 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 renewable resource with low embodied energy, its use supports the project’s sustainability goals. Different kinds of wood are used for different purposes, from glulam roof beams to maple slat finishing for the walls. Using wood allows the structure of the building to be expressed and celebrated. The programs and activities are united by the undulating roof. The warmth of the wood and its rich colour and texture provide a welcoming ambiance. In keeping with Province of Alberta’s legislation for public buildings, the Centre is seeking LEED Silver certification. The use of locally-sourced glulam and other wood products contribute to meeting this sustainable design standard.

BP6 – MANAGING MOISTURE AND WOOD
Surrey Memorial Hospital Critical Care Tower – Surrey, BC
Timmins Library & Judy A. Shank Integrated Services Building
UBCO Fitness and Wellness Centre – University of British Columbia Okanagan Campus
Hamilton and Oyster River Fire Halls – Richmond and Comox, BC
Innovating with Wood – A Case Study Showcasing Four Demonstration Projects
Innovative Wood Use in BC – A Case Study Showcasing Three Demonstration Projects
Long-term Care Facilities – Norview Lodge & Parkwood Mennonite Home
Meadows Community Recreation Centre and Library
The Wood Reference Handbook is much more than a guide to the architectural use of wood in building construction – it is a beautifully assembled homage to fine wood...
Engineers, architects, building code officials, builders, developers, students and professors all turn to Introduction to Wood Building Technology – the most current guide...
Canadian Lumber Properties is a source of information on the structural properties of Canadian softwood lumber derived from full-size (“in-grade”) tests.
Wood Highway Bridges demonstrates how wood bridges can be designed to be assembled rapidly, resist deterioration caused by de-icing chemicals, and utilize stress-laminating...
Wood Piles provides clear and concise coverage of a topic that is often considered obscure However, wood piling has been used around the world to support heavy loads for...

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