Pro-Fit 1-1/4 in. Roofing Electro-Galvanized Nail Plastic Head 1 lb

Caps are nails with a round plastic or steel disc used to secure the building envelope. The cap provides greater holding power than nails alone. Cap nails are used in residential and commercial settings. The building envelope is the physical separator between the interior and exterior environments of a building. Roofing underlayment, housewrap and other envelope materials focus on moisture, air, heat and vapor control to help maintain the indoor environment and facilitate climate control. Staples and nails are commonly used to install the envelope, but for every point of penetration, the entry hole is an opportunity for moisture to infiltrate the barrier reducing the effectiveness of the envelope.