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2021 NABCEP CE Conference!

Unvented Roofs without Spray Foam: The Rest of the Story


Instructor: Kohta Ueno

Subjects: Green Building: Building Science, Green Building: Sustainable Building, Green Building: Insulation, Green Building: Ventilation IAQ

Student Rating

9.3 out of 10 (view ratings)
231 students have taken this course


This course was originally presented at BuildingEnergy Boston 2020, a conference presented by the Northeast Sustainable Energy Association (NESEA)

Back in 2016, our team started a multiyear experiment, sponsored by Building America, on unvented roofs without spray foam or exterior rigid insulation, using an instrumented test hut with multiple test bays. The experiment examined cellulose vs. fiberglass insulation, interior vapor control membranes, diffusion vents at the ridge, interior humidification, inward vapor drive issues, and the effect of air barrier imperfections. Some preliminary results were presented at BuildingEnergy Boston in early 2018. After three winters of experimentation, this is the rest of the story. We will give our take on what works, what is too risky, and what you might be able to get away with some of the time.

Learning Objectives

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Flexible Online Training for Industry Professionals

This online course is self-paced. You can begin instantly upon enrollment.

Access Information and Build Your Training Library

After enrolling, the course materials will remain in your account and be accessible 12 months (1 year) after enrollment. Access can be extended beyond 1 year with a monthly membership. Rewatch videos and review assignments as many times as you want. View updates the instructor makes to the course as the industry advances. Return to your course anytime with online access from anywhere in the world.

Earn A Certificate of Completion

When you complete this course you are eligible for a certificate of completion from HeatSpring. You can download your certificate as soon as you have completed all of the course requirements. Students can easily share their verified certificates on their LinkedIn profiles using our LinkedIn integration.

Continuing Education Credits Available for Additional Fee

The course and all materials are available for free. If you would like continuing education credits they are available through NESEA for an additional fee after completing the course. There is a $25 administration fee per course to receive credits, no matter how many types of credits you are seeking, to help cover NESEA's CEU costs and staff time. (NESEA is a non-profit organization.)

Earn Continuing Education Credits

Approved for: 1 AIA LU/HSW, 1 BPI CEUs, 1 hours towards MA CSL 4.5 hour block.


Kohta Ueno

Building Science Corporation, Senior Associate

Kohta Ueno is a senior associate at Building Science Corporation, a building science consulting and architecture firm with offices in Boston, Massachusetts and Waterloo, Ontario. His responsibilities at Building Science Corporation include forensic field investigations, energy and hygrothermal modeling, building science research, and field testing. His undergraduate...[more]

Course Outline

Unvented Roofs without Spray Foam: The Rest of the Story

  • Unvented Roofs without Spray Foam: The Rest of the Story (Video - 01:02:57 hours)
  • OPTIONAL: Take quiz for CEU credits (Quiz)
  • OPTIONAL: Request CEUs from NESEA (Resource)
  • OPTIONAL: Subscribe to NESEA Communications (Resource)
  • OPTIONAL: Attend BuildingEnergy Boston 2021 (Text)

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