What is the unit of measure for vapor retarder when taken off?

The unit of measure for a vapor retarder when taken off is square foot. This is because vapor retarders are typically installed as flat sheets or membranes that cover a surface area to prevent moisture from passing through. Measuring materials like vapor retarders is commonly done in terms of area, which is expressed in square feet. This measurement allows contractors and estimators to determine how much product is needed to adequately cover the intended surface area, ensuring effective moisture control in construction projects.

In contrast, cubic foot would be more appropriate for measuring volume, such as insulation or materials that are packed into a space. Linear foot is used for measuring lengths of materials like pipes or framing lumber, where the dimension in one direction matters rather than an area. Lastly, rolls refer to the way vapor retarders are packaged, but rolls do not represent a unit of measure for estimating the quantity needed across a defined area. Thus, square foot is the correct choice for measuring vapor retarders.