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Video: A Passivhaus Foundation

Installing a capillary break on top of concrete footings

Posted on Dec 29 2011 by GBA Team

Scroll down this page to see a construction site video of the Karuna House in Yamhill County, Oregon, showing the installation of capillaryForces that lift water or pull it through porous materials, such as concrete. The tendency of a material to wick water due to the surface tension of the water molecules. break material on top of the footings to prevent moisture from wicking up the foundation walls.

The Karuna House was designed by Holst Architecture and built by Hammer & Hand of Portland, Oregon.

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Foam Under Footings

Yes, you can build your house on rigid foam — as long as you can convince your local code official to let you do it

Posted on Dec 10 2010 by Martin Holladay

UPDATED on January 26, 2018

A wide variety of residential foundation types, including monolithic slabs, crawl space foundations, and basement foundations, can lose heat due to poorly detailed insulation at the concrete footings. That’s because many construction details, including some details on the Web site, fail to address thermal bridgingHeat flow that occurs across more conductive components in an otherwise well-insulated material, resulting in disproportionately significant heat loss. For example, steel studs in an insulated wall dramatically reduce the overall energy performance of the wall, because of thermal bridging through the steel. through foundation footings.

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Image Credits:

  1. GreenBuildingAdvisor
  2. Building Science Corporation
  3. PATH / NAHB Research Center
  4. Isoquick
  5. Image #7: Hayfield House
  6. Image #8: Chris Corson
  7. Image #9: Legalett
  8. Image #10

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