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Can I leave Johns Manville AP foil exposed?

AP foil leave manville
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Can I leave Johns Manville AP foil exposed?

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This product should not be left exposed. The major building codes in the United States and Canada require that foam insulation be covered by an approved thermal barrier such as 1/2 inch gypsum wallboard, or in some cases 1/4 inch plywood or 26 gage corrosion resistant sheet metal.

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