Section 408.30413. Vapor retarders.

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Rule 413. Section 1405.3 of the code is amended to read as follows:

1405.3. Vapor retarders. Class I or II vapor retarders shall be provided on the interior side of frame walls in zones 5, 6, 7, 8 and marine 4.

Exceptions:

1.      Class III vapor retarders shall be installed on the interior side of frame walls when insulating sheathing having a class I or II perm rating is installed on the exterior side of the wall.

2.    Class I or II vapor retarders shall not be installed on the interior side of either of the following:

a.    Frame basement walls.

b.    The below grade portion of any frame wall.

3.    Construction where moisture or its freezing will not damage the materials.

History: 1979 AC; 1981 AACS; 1985 AACS; 1995 AACS; 2010 AACS.

                    
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