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Urea formaldehyde foam insulation may be applied or installed only if:
  1. It is installed in exterior side walls; and
  2. A four-mil-thick plastic polyethylene vapor barrier or equivalent plastic sheathing vapor barrier is installed between the urea formaldehyde foam insulation and the interior space in all applications.
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Standards for Insulating Material, Urea Formaldehyde Foam Insulation Safety Notice
-mil thickness plastic polyethylene vapor barrier, or equivalent plastic sheeting vapor barrier, shall be installed between the urea formaldehyde foam ...