previous
  • Video: Build a curved step
    Video: Build a curved step
  • 7 Trim Carpentry Secrets
    7 Trim Carpentry Secrets
  • 12 Remodeling Secrets
    12 Remodeling Secrets
  • Magazine Departments
    Magazine Departments
  • Remodeling in Action
    Remodeling in Action
  • Slideshow: 12 Stunning Remodels
    Slideshow: 12 Stunning Remodels
  • Solid Deck-Framing Advice
    Solid Deck-Framing Advice
  • 9 Concrete Countertops Ideas
    9 Concrete Countertops Ideas
  • 7 Smart Kitchen Solutions
    7 Smart Kitchen Solutions
  • Clever daily tip in your inbox
    Clever daily tip in your inbox
  • 7 Small Bathroom Layouts
    7 Small Bathroom Layouts
  • Video: Install a Fence
    Video: Install a Fence
  • Energy-Smart Details
    Energy-Smart Details
  • Basement Remodeling Tips
    Basement Remodeling Tips
  • Gallery: Custom Flooring
    Gallery: Custom Flooring
  • Read FHB on Your iPad
    Read FHB on Your iPad
  • Master Carpenter Videos
    Master Carpenter Videos
  • Tips & Techniques for Painting
    Tips & Techniques for Painting
  • All about Roofing
    All about Roofing
  • Design Inspiration
    Design Inspiration
next
Pin It

A Better Wall with Exterior Foam

Why a longtime SIP builder turned to rigid polyiso for insulation

Builder Jonathan Orpin was a diehard fan of SIPs and used them in countless projects. Over the years, though, he started to realize that manipulating SIPs for sidewalls required a lot of work when cutting openings and routing mechanicals. To get around this problem, Orpin developed what he calls the matrix wall, which consists of conventionally framed 2x6 walls with either wet-sprayed or netted dense-pack cellulose in the cavities and polyisocyanurate foam in the exterior. Housewrap and a rain screen of 1x strapping serve as a weather-resistant barrier. Orpin says the assembly yields an R-30 wall with negligible thermal bridging and a managed dew point. This article includes sidebars on controlling moisture in walls and describing a better way to install windows.

A Better Wall with Exterior Foam

Become a Fine Homebuilding Member

to view this article and over a thousand more

Learn More