Cross-Laminated Timber in the Capital

Transcription

1 Cross-Laminated Timber in the Capital A Case Study: Washington Latin Public Charter School Gymnasium Presented by Ann Neeriemer, AIA, LEED AP Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board.

2 The Wood Products Council is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516. Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-aia members are available upon request. This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

3 Course Description The new 11,266 SF gymnasium at the Washington Latin Public Charter School marks an exciting new approach to school design. The first cross-laminated timber (CLT) building in the region, it demonstrates how mass timber can be used to cost-effectively create extraordinary spaces that support student well-being. This presentation by the project architect will include details on the structure, which features both CLT and glulam, as well as lessons learned during design and construction. Topics will include why mass timber was chosen, design challenges and solutions, building official interaction and approval process, and logistical coordination.

4 Learning Objectives 1. Identify the environmental benefits of utilizing cross-laminated timber for building projects. 2. Determine how CLT can be used while conforming to health and safety building codes. 3. Assess different benefits realized through the use of CLT including factory prefabrication, waste reduction, and construction schedule savings. 4. Describe how CLT lowers energy used in construction, reduces heat loss during occupation, and enhances the health and welfare of occupants by recalling connections to the natural environment.

5 Agenda Project Overview & History How CLT was introduced What is CLT? Design Process and Building Codes Procurement and Construction Process Results

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7 Washington Latin Public Charter School

8 1930 Partial Construction of Cuno Rudolf Elementary 1962 Addition of two classroom wings to the north 1965 One-story addition to the south 2013 Demolition of south classroom wing, and addition of library 2015 Gymnasium Addition

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12 Images courtesy of KLH UK

13 What is Cross-Laminated Timber (CLT)? Dimensional lumber planks laminated in alternating directions. Typically spruce / fir Kiln-dried and finger jointed Glued together using high pressure bonding. Most manufacturers use polyurethane adhesive. Can be made in 3, 5, 7, or more layers

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15 Benefits & Risks Overall Benefits of Using CLT Fewer CO2 emissions Lower embodied energy Higher carbon sequestration Reduced waste on site Shorter erection and assembly time Potential risks our team considered: Unfamiliar system and process Code review Cost unknowns Procurement

16 Benefits & Risks Occupant Benefits of Wood as an Interior Surface Improved air quality Improved acoustics Reduced heart rate Improved subjective quality of sleep Improved student concentration Reduced aggression, and Improved personal interactions References: C. Keltz, V. Grote, & M. Moser. Interior wood use in classrooms. Austria (2011) Steiermark, Graz, Zeltweg. Schule ohne Stress. Austria (2014) University of British Columbia, FPInnovations. Wood and Human Health. Canada

17 Design Process Product research Code review and meetings with building authorities Coordination with manufacturer and engineering team Structural coordination with surrounding building Systems integration

18 Code Review Process Fire safety Construction classification Type VB Performance of wood in fire events

19 Code Review Process Structural compliance

20 CLT as structural wall CLT as diaphragm wall with glu-lam column supports

21 Design Coordination Exterior Wall Assembly

22 Design Coordination

23 Design Coordination

24 Construction Process

25 Panel Placement

26 Panel Placement

27 Assembly

28 Assembly

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30 Finishing the Panels

31 Structural Coordination

32 Waterproofing & Cladding

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35 Environmental Impact Using mass timber in place of conventional structural materials for the design resulted in: 315 Metric tons of embodied greenhouse gas emissions avoided 67 Equivalent number of cars off the road for a year

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40 QUESTIONS? This concludes The American Institute of Architects Continuing Education Systems Course Ann Neeriemer, AIA, LEED AP Perkins Eastman DC