Unlike asphalt shingle roofs, which are nailed tightly to the underlayment, tile and slate roofs allow air and moisture to flow beneath them.
Unlike asphalt shingle roofs, which are nailed tightly to the underlayment, tile and slate roofs allow air and moisture to flow beneath them.
A high-performance underlayment is intended to allow moisture from accumulating in a vacuum and/or highly insulated structure to diffuse outward and into the ventilated space.
DELTA®-FOXX is the highest vapor permeable, water-resistive underlayment on the market today. It is a 2-layer roof underlayment, specifically designed for use with tile and slate roofs.