July 31, 2001

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American PolySteel Forms
Mr. Pat Murphy
5150-F Edith Blvd. NE
Albuquerque, NM 87107

Mr. Murphy,

     I have reviewed the information forwarded from Jerry Picarazzi.  I understand that there is a concern regarding condensation on the metal strips on the PolySteel forms.

     I have had the opportunity to test many homes built with your PolySteel product.  Mr. Picarazzi referenced a report, which indicated a 2-degree temperature difference between the steel strips and the remainder of the wall.  This was found to be fairly constant throughout all the structures tested.

     I had the opportunity to inspect and test a PolySteel home in the Minneapolis, Minnesota area.  This home had a basement and first floor built with your product and a second story built with standard "stick" construction.  The home was tested in January.  On the day of the test, the interior was set at 72 degrees F.  The exterior free air temperature was between -10 to -15 degrees F.  The humidity on the interior and the exterior was not measured, however, it was snowing on and off throughout the test period.  This home had several different wall coverings, drywall, wood, tile and stone.  At no point was any condensation or damage as a result of condensation seen in this home.  The delta T between the strips and wall surface was found to be between 1 and 5 degrees F.  It is important to note that the standard framed portion of this home showed differences of 5 to 15 degrees difference between the framing members and the insulated wall cavities.

     While every climate and set of conditions could not be covered in my testing, I feel that a good sample has been taken.  I believe that the Minneapolis home would be one of the more extreme environments.  In that situation, and all others tested, condensation was never a factor.  It is my opinion that even with extreme temperature differences between interior and exterior, the delta T between the strips and the wall cannot be sufficient as to allow condensation.

     I would be happy to address and questions anyone may have.  Please feel free to give me a call.

 

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