Posted by Adirondack case guy on October 05, 2019 at 07:24:10 from (74.65.90.205):
In Reply to: Re: Water based foam posted by zep on October 05, 2019 at 06:48:47:
Zep; I have a question for you. When I was erecting commercial steel buildings the insulation company that did our insulation work said that open cell was necessary on exterior steel because the steel expanded and contracted with heat and cooling and exposure to direct sun light. The open cell would expand and contract with this issue, and closed cell would not and lead to coming loose or distortion of the sheet steels. What is your take on this reasoning?? They also insisted on an air gap between the foam and the 2" thick DOW INSOLBOARD that we applied to the interior for walls and ceilings. which had a 1 hr. fire rating and offered another R-10 insulation rating, and was a moisture barrier. Loren
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