Uploaded March 2026 | Updated September 2026, 45 minutes ago
Many are asking if ZIP-R insulated sheathing, popular for wall assemblies, can be successfully used on unvented roof assemblies with exterior insulation. We break down the critical issues, including the fact that it's not a structural layer, often violates the manufacturer's warranty, and its maximum R-12 is frequently insufficient for condensation control in colder climates. Learn why you need a structural sheathing substrate, a dedicated air barrier, and a proper underlayment, and see which dedicated roof products make more sense for a long-term durable assembly.
Link to Matt Risinger's Video: youtu.be/zVi2ltsJs8U?si=bcttPi_sNt8ohy8j
*Exterior Insulation For Roofs (3 DIFFERENT WAYS!)* : youtu.be/3hOY38uOXxE
*Enroll in our FREE training on integrating continuous insulation and get 15% off our new Continuous Insulation Course:* asiri-designs-building-science-school.teachable.com/p/continuous-insulation-navigating-new-building-envelope-standards
*Request Building Science Consulting Services For Your Project:* asiri-designs.com/consulting
*Get our High Performance CAD Details* : asiri-designs.com/shop
*A Moisture Management Guide For Residential Remodels (eBook)* : asiri-designs.com/shop/ols/products/moisture-management-for-residential-remodels
*150+ Free Building Science Articles:* asiri-designs.com/resources-1
Many are asking if ZIP-R insulated sheathing, popular for wall assemblies, can be successfully used on unvented roof assemblies with exterior insulation. We break down the critical issues, including the fact that it's not a structural layer, often violates the manufacturer's warranty, and its maximum R-12 is frequently insufficient for condensation control in colder climates. Learn why you need a structural sheathing substrate, a dedicated air barrier, and a proper underlayment, and see which dedicated roof products make more sense for a long-term durable assembly.
Link to Matt Risinger's Video: youtu.be/zVi2ltsJs8U?si=bcttPi_sNt8ohy8j
*Exterior Insulation For Roofs (3 DIFFERENT WAYS!)* : youtu.be/3hOY38uOXxE
*Enroll in our FREE training on integrating continuous insulation and get 15% off our new Continuous Insulation Course:* asiri-designs-building-science-school.teachable.com/p/continuous-insulation-navigating-new-building-envelope-standards
*Request Building Science Consulting Services For Your Project:* asiri-designs.com/consulting
*Get our High Performance CAD Details* : asiri-designs.com/shop
*A Moisture Management Guide For Residential Remodels (eBook)* : asiri-designs.com/shop/ols/products/moisture-management-for-residential-remodels
*150+ Free Building Science Articles:* asiri-designs.com/resources-1
