Dimensional optimization of beetle kill pine

Interlocking Cross Laminated Timber (ICLT).

Massih Nilforoushan Hamedani

MSAS, University of Utah

• Background

• Research Question

• Methods

• Findings

• Conclusion

• Acknowledgments

Quick Review

• What is Mountain Pine Beetle

• Mapping Pine Beetle

• Solid Timber Construction and BKP

Mountain Pine Beetle

Background

Before and after images from the Landsat 5 satellite

reveal beetle damage in Rocky Mountain National

Park in Colorado.

Credit: USGS/NASA’s Earth Observatory

• Glued

• Glu-laminated Timber (GLT)

• Laminated Veneer Lumber (LVL)

• Cross Laminated Timber

• Non-glued solutions

• Nail-laminated Timber (NLT)

• Interlocking Cross Laminated Timber (ICLT)

Solid Timber Products

Background

Credit: ITAC

• Introduction

Interlocking Cross Laminated Timber

Background

Girls scout cabin, Utah, Credit: ITAC

Research Question

What is the impact of moisture content of ICLT panels on dimensional stability of them?

Research Question

• Hygrothermal analysis of the ICLT assemblies (One dimensional computer modeling)

• Literature review of drying methods and schedules and wood moisture relations

• Survey data from different stages of supply chain

• Experiment hygrothermal behavior and dimensional changes of ICLT wall assembly (girls scout cabins in Utah)

Methods

Hygrothermal Analysis (drying rate) of

ICLT panel

Finding / Data

• Wall Assemblies:

• Insulated / Non-insulated

• Vapor open / Vapor tight

• Simulation Climate Conditions• Anchorage, Alaska

• Seattle, Washington

• Salt Lake City, Utah

• Minneapolis, Minnesota

• Atlanta, Georgia

• Miami, Florida

• Baltimore, Maryland

• Boston, Massachusetts

Dimensional Change

Finding / Data

• Dimensional change within the moisture content limits of 6% to 14% estimated by:

∆𝐷 = 𝐷𝐼 [𝐶𝑇 𝑀𝐹 −𝑀𝐼 ]∆𝐷: change in dimension

𝐷𝐼 : dimension at start of change

𝐶𝑇 :dimensional change coefficient

𝑀𝐹 : moisture content at end of change

𝑀𝐼 : moisture content at start of change

• Example: a flat grained 9.15 in white fir board at 8% MC will be 9.217 in at 11% MC.

Conclusion

Conclusion / Future Research

• Drying schedule suggestion (minimizing dimensional changes and setting pitch)

• Future Research:

• Evaluation of BKP solid timber production supply chain in western region

• ICLT Potential market in western region

Conclusion

Acknowledgements

• University of Utah

• Integrated Technology in Architecture Center

• US Forest Service, Forest Products Laboratory

• Euclid Timber, LLC, Heber, Utah

Q&A

Questions?