HWD-15 hardwood floor underlayment is an economical and extremely effective Class III moisture vapor retarder specifically designed for optimum performance in wood flooring applications. Consisting of a single layer of kraft paper saturated with asphalt, HWD-15 is a permeable vapor retarder with a moisture vapor permeance of 5. By reducing the rate of moisture migration, HWD-15 protects against moisture vapor related floor problems such as buckling, cupping or cracking. As a permeable material, HWD-15 will not trap moisture condensation between it and the sub-floor, which can happen with poly films and other vapor retarders.
Clean and Easy Handling HWD-15 passes the stringent requirements of California’s Section 01350 Indoor Air Quality emissions standard. With little or no asphalt rub-off or odor, HWD15 is considerably cleaner than other materials, such as roofing felt. It’s also lighter and easier to work with.