"I can't install this" - Poka-Yoke on the job sitecomments (5) September 4th, 2012 in Blogs
My college degree is in Industrial Management, and a good portion of my studies were about Japanese Management Techniques. In the 1960's Toyota had a very astute Industrial Engineer named Shigeo Shingo (he was a W Edwards Deming student) who is credited with the technique of Poka-Yoke. Poka-yokes ensure that proper conditions exist before actually executing a process step, preventing defects from occurring in the first place.
That's not good! Unflashed penetration. It could be caulked on the inside to prevent air flow, but that wouldn't stop water from working in to the wall cavity and rotting the house out. This type of error happens daily on job sites around Austin but clients won't know there is a problem till 5-10-15 years later when it's a major issue to fix. My guy was correct in saying STOP.
These penetrations need a gasket boot from QuickFlash that seals the duct much like a roof penetration.
That boot is then properly taped to the Tyvek layer with Tyvek tape for a water & air tight seal. This method isn't dependent on caulking the siding to prevent water infiltration.
All done. Much better!
This penetration is under the roof overhang, but a windy rainstorm could have easy wet the wall in this location and caused moisture intrusion.
Hard to see in this photo, but the windows are "trim less". We used a metal flashing all around the windows to give the window flange the depth we needed for the foam and the rainscreen battens then Hardie Plank siding.
Side note here, but I really like the outside corner detail specified by Scott Ginder the Architect with Dick Clark Architects.
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