Rooftop Photovoltaics – How to Save Money on Energy and Avoid Spending It On Roof Repairs

Friday, June 22, 2012
Free. Please RSVP to for room set-up

The use of rooftop solar photovoltaic (PV) panels has increased dramatically as have problems with the roof coverings over which they are installed.  This presentation discusses some practical ways building owners and design professionals can reap the benefits of conserving energy and avoid unwelcome surprises associated with non-fire rated systems, roof leaks, premature roof deterioration, inadvertent voiding of roof covering warranties, compromised access for fire suppression efforts, and excessive costs associated with temporarily removing and reinstalling PV panels to effect needed roof maintenance and repairs.

About the presenter: Philip D. Dregger, PE, RRC, Technical Roof Services, Inc. (TRS). Phil Dregger is a professional
engineer, registered roof consultant, author, and fellow of the Roof Consultants Institute. He has investigated
problems and provided testimony regarding virtually all types of roof and waterproofing systems since the early 1980’s.
He has special expertise in roof wind damage (hurricanes), rooftop solar photovoltaics (PV), and complex moisture
accumulation problems. Dregger has authored several articles on roof technology.

Learning Objectives – Understand practical considerations related to long term successful performance of rooftop solar photovoltaic systems (including integrated, roof bearing, and rack mounted systems) and the roof coverings they are installed upon.

  1. Protecting Existing Roofs – leaks, warranties, and durability considerations.
  2. System Design – Class C fire ratings, wind uplift on “open” arrays, and “cooling penalty” of integrated panels.
  3. Panel Installation – “Creep” of non-penetrating systems, excess heat transmission to roof below, billowing of mechanically attached single ply roof membranes).
  4. Future Roof Access – panel cleaning, roof maintenance, and pathways for fire suppression.

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