PHRC Webinars

Insulating with Exterior Rigid Foam

10/14/2014 1:00 PM - 2:00 PM

Instructor: Chris Hine


Link to Webinar:


This webinar will focus on the benefits and obstacles of an exterior wall assembly constructed with rigid foam. Rigid foam can currently be used as an option in the prescriptive insulation design path for the 2009 IECC and 2009 IRC chapter 11. The installation of rigid foam to the exterior of the wall has added benefits such as the increase of overall wall assembly R-values, the reduction of thermal bridging and can be an added barrier for air infiltration. Along with the benefits come added obstacles. Some of these obstacles include the overall thickness of the wall assembly when used in conjunction with wood structural panels. This added thickness can deviate from industry standard extension jambs for doors and windows. The added insulation also directly affects the dew point with in the wall assembly. We will take a brief look into what happens to the dew point in standard wall assemblies when rigid foam is added. With the information included in this webinar, the decision to add rigid foam to the exterior of a residential home will be both educated and informed.

Learning Objectives

Learning Objectives

• Understand the optional prescriptive path to the 2009 IECC and 2009 IRC Chapter 11 for insulating with exterior rigid foam.

• Look at different application methods for installing rigid foam. This will include adding foam over WSP, adding foam under WSP, adding form without WSP.

• Identify the areas of concerns for increasing the overall thickness of the wall assembly and looking at solutions to those concerns. An example of this would include how to adapt to different size extension jambs for doors and windows.

• Understand how the added insulation changes the dynamic of the “building science” within the wall assembly. This includes the movement of the dew point based on R-values and cavity insulation.


Free to attend; $20 for continuing education credits

Credit Hours


Tags: Energy Efficiency, Energy Codes, and Green Building



The Pennsylvania Housing Research Center serves the home building industry and the residents of Pennsylvania by improving the quality and affordability of housing.

We conduct applied research, foster the development and commercialization of innovative technologies, and transfer appropriate technologies to the housing community.

Pennsylvania Housing Research Center

219 Sackett Building

The Pennsylvania State University

University Park, PA 16802

Phone: 814-865-2341

Fax: 814-863-7304