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International Society of Arboriculture
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Event Details

Structural Support Systems

Date: August 19, 2019 - August 20, 2019
Location: Washington Park Arboretum – Graham Visitor’s Center, Seattle, Washington, UNITED STATES
Organizer: Pacific Northwest Chapter of ISA
Sponsor: Pacific Northwest Chapter of ISA
Description: What is structural support and how does it affect tree health and longevity? The Structural Support Systems Workshop will be a 2 day workshop that is lecture based and hands-on. This workshop will cover the ANSI A300 Part 3 Supplemental Support Systems standards that are applied to the installation and maintenance of tree support systems, including cabling, bracing and guying. Various cabling approaches with be discussed such as bracing for split trees, through rods, and outside the box support systems. Static versus dynamic cabling systems will be compared, looking at where, when and why to install each system. Looking at structure support of weakened unions, wind dampening, and supporting abnormal growth structure, we will take a comprehensive approach at the purpose of cabling a tree and which system would likely be most successful. Cabling system construction and installation practices will be discussed to focus on the approach to find the most effective system to fit the tree.

This workshop will cover:

Basic understanding of the ANSI A300 Part 3 Standards
Tree structure and stability, what common structural issues require supplemental support systems
Fundamentals of static and dynamic cabling systems including various configurations, approaches, and outside the box support systems

This workshop also include:

Hands-on dynamic cabling installation practice
Display of static cabling hardware and discussion of different systems and approaches
Field discussion, students will walk through arboretum to identify structural concerns with trees and offer ideas for support systems to mitigate the poor structure or abnormal growth habit.


Location: Washington Park Arboretum, 2300 Arboretum Drive E, Seattle, WA 98112

DAY 1 - Monday, August 19: 8:00am - 3:00pm

8:00am - 9:00am: Introduction - What is structural support and how does it affect tree health and longevity?
9:00am - 10:00am: ANSI A300 Part 3 Standards
10:00am - 10:30am: Break
10:30am - 11:30am: Tree structure and targets, why we install support systems
11:30am - 12:30pm: Arboretum walk and discussion, identify poor tree structure and targets present, will a support system be solution to mitigate structural issues? What system would be most effective?
12:30pm - 1:00pm: Lunch
1:00pm - 3:00pm: Dynamic versus static cabling systems lecture and introduction to hardware

DAY 2 - Tuesday, August 20, 8:00am - 3:00pm

8:00am - 9:00am: Review - What is structural support and why we install support systems
9:00am - 10:00am: Comprehensive approach to dynamic support systems
10:00am - 10:30am: Break
10:30am - 12:30am: Hands-on, installation of dynamic support systems, outside the box approaches, and other considerations
12:30pm - 1:00pm: Lunch
1:00pm - 2:00pm: Static cabling systems, bracing and through rods, installation practices, combination approaches utilizing dynamic and static support systems together, and other considerations
2:00pm-3:00pm: Concluding thoughts and discussion, how to select effective support systems that best fit the tree to mitigate structural issues


Philip Kelley is a lead climber and instructor. He has 26 years in the industry and is a Past President of the Georgia Arborist Association and has been a Certified Arborist since 2000. He is a judge for the ISA North American Tree Climbing Championship and ISA Aerial Rescue International Tree Climbing Championship. He has taught for North American Training Solutions since 2009. He is a contract climber and owner of Samara Tree Preservation and Training since 2014.

Philip is an ISA Certified Arborist, Certified Instructor for Tree Worker/Climber specialist, Aerial Rescue Technician, Line clearance tree trimmer, Electrical Hazard Awareness, Aerial Lift Specialist, Hazard Tree Assessment, Tree Dynamics and Integrated Risk Assessor, Advanced Chainsaw Safety Cutting & Fe
Contact Name: Margo Thorp
Contact Email:

Seats Available: 16
CEUs available: Yes

Start Date: 8:00 AM, August 19, 2019
End Date: 3:00 PM, August 20, 2019

Address: Washington Park Arboretum – Graham Visitor’s Center
2300 Arboretum Drive E
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