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Why isn there a vapor barrier in the structural insulated panel?

April 26, 2017barrier insulated panel structural vapor

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Why isn there a vapor barrier in the structural insulated panel?

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The structural insulated panel itself serves as the vapor barrier. Most model building codes require a vapor barrier with a perm rating of 1 or less. The perm rating of the Thermotech 21™ structural insulated panel system is less than 1. Moreover, with the Thermotech 21™ SIP wall system, voids are eliminated and therefore moisture does not condense. Moisture is not a problem with this structural insulated panelized system. The expanded polystyrene (EPS) material in the SIPS will absorb and release moisture on a seasonal basis, but there are no harmful effects from this cycling.