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How-To

Part 4: Air-Seal and Insulate a Nail-Fin Window over a Fluid-Applied WRB

Spray foam and high-quality sealant bridge all of the gaps between the framing, shims, and window for a durable and energy-efficient installation.

By Jake Bruton

With the window flashing done, the next step in any window installation is to air-seal and insulate. This work happens from the inside, and is the same regardless of water-resistive barrier (WRB). In this video, builder Jake Bruton walks through the theory of air-sealing and insulating, its importance to the overall function of a window installation and the comfort of the home, and the materials and methods needed to do the work well. Highlights include tips about how much foam to spray into the gap between window frame and rough opening, and how to tackle problematic details, like air-sealing around shims.

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Videos in the Series

  • Part 1: Prepare a Rough Opening for a Nail-Fin Window over a Fluid-Applied WRB

    Use the liquid WRB and a piece of bevel siding to build a sloped sill before liquid-flashing the entire surface.

  • Part 2: Install a Nail-Fin Window Over a Fluid-Applied WRB

    Dry-fit the window, then run a bead of liquid flashing that provides an extra layer of protection against water intrusion.

  • Part 3: Flash a Nail-Fin Window over a Fluid-Applied WRB

    Mask off the window to keep things clean when you flash the window flange to the wall.

  • Part 4: Air-Seal and Insulate a Nail-Fin Window over a Fluid-Applied WRB

    Spray foam and high-quality sealant bridge all of the gaps between the framing, shims, and window for a durable and energy-efficient installation.

  • Have a different type of wall? Check out the full video series

    See additional window-flashing details for walls with Zip System sheathing, Exterior Rigid Foam, Housewrap, and Peel-and-stick Membranes

Previous: Part 3: Flash a Nail-Fin Window over a Fluid-Applied WRB Next: Weatherproof Window Installation, Episode 1: Prepping the Rough Opening

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Windows & Doors

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Installing Windows In New Walls

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Windows & Doors

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Choosing Windows
  • Window Types
  • Design and Materials
  • Energy-Efficient Windows
Installing Windows In New Walls
  • Installation, Start to Finish
  • Head Flashing for Windows
  • Video Series: Nail-Fin Window over Zip System Sheathing
  • Video Series: Nail-Fin Window over Exterior Rigid-Foam Insulation
  • Video Series: Nail-Fin Window over Housewrap
  • Video Series: Nail-Fin Window over Peel-and-Stick Housewrap
  • Video Series: Nail-Fin Window over a Fluid-Applied WRB
  • Video Series: Weatherproof Window Installation
Retrofitting Windows
  • Removing the Old, Installing the New
  • Video Series: How to Replace a Window
  • Video Series: Install a Full-Frame Replacement Window in a Brick Wall
  • Video Series: Install an Insert Replacement Window in a Brick Wall
  • Video Series: Retrofit a Flanged Window
Window Repairs
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Door Basics
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Exterior Doors
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  • Adding Weatherstripping and Sweeps

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