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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.

Skylar Swinford of Hammer & Hand listed materials that can be used as a capillary break between foundation footings and foundation walls: "We typically use Tremco TREMproof 250GC. It can be installed on green concrete. Henry CM100 Cold Fluid-Applied High Building Waterproofing and ePro ECOLINE-R Liquid Applied Membrane are also both intended for application over green concrete and should be suitable alternatives. I've also seen BASF MasterSeal HLM 5000 (formerly SONOSHIELD HLM 5000) used for this application, but the data sheet recommends a primer before installing on green concrete."

Installing a capillary break on top of concrete foolings

Foundation Footings: Karuna House Video #2 from HammerAndHand on Vimeo.

Here's a link to the first video in the series: Installing Rigid Foam Under Footings.

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