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EcoSeal: A New System for Air Sealing Homes

Knauf EcoSeal, a sprayable caulk installed prior to cavity-fill insulation, can provide a significant reduction in air leakage

Posted on Apr 18 2013 by Alex Wilson

Getting back to our Dummerston, Vermont farmhouse this week, I’m reporting on our use of a relatively new product for air-sealing homes: EcoSeal from Knauf Insulation.

First some context: In the building science world, there is growing interest in achieving a robust air barrierBuilding assembly components that work as a system to restrict air flow through the building envelope. Air barriers may or may not act as a vapor barrier. The air barrier can be on the exterior, the interior of the assembly, or both. at the sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen. layer of a house, with layers inside of that able to dry toward the interior and layers on the outside able to dry to the exterior. To make that work, the sheathing layer has to be tightly air-sealed.


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  1. Alex Wilson

Flanged Window Replacement in a House with Wood Siding (5/5)

Step 5: Flash, Trim, and Seal the Window

Watch remodeler Bill Robinson as he shows how to use a combination of materials to flash over the flanges, and install a pre-built casing over the new window.

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Flanged Window Replacement in a House with Wood Siding (4/5)

Step 4: Install the Window

Watch remodeler Bill Robinson as he applies sealant to the window flange, checks the window for plumb, level, and square, and fastens the flanges to secure the window.

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Flanged Window Replacement in a House with Wood Siding (1/5)

Retrofit a Flanged Window

Step-by-step instructions for a leak-free, energy-efficient window replacement

with Bill Robinson

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The most important part of installing a flanged window is tying in with the existing flashing details.

It is also the most difficult part. Builder and construction trainer Bill Robinson shows how to avoid water infiltration.

Think about the four Ds:

  • Deflection
  • Drainage
  • Drying
  • Durability

In this Project House video series, Robinson demonstrates how to:

  • Carefully remove the old window
  • Flash the rough opening to prevent water from getting inside the building cavity
  • Install the new window
  • Flash the window flange
  • Case the window
  • Caulk the exterior and air-seal the interior

This first episode is available to everyone, the rest of the episodes are available to GBAGreenBuildingAdvisor.com Pro members only.

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