Seals applied to the frames of patio access points prevent air and water infiltration. These barriers, available in various materials like foam, rubber, felt, and vinyl, are designed to close gaps between the door and its frame. For instance, a compression bulb seal installed along the vertical edge of a sliding glass door effectively blocks drafts.
Effective sealing significantly improves energy efficiency by reducing heat loss in winter and heat gain in summer, leading to lower energy bills. It also enhances indoor comfort by eliminating drafts and minimizing noise transmission. Furthermore, it protects against moisture damage, which can lead to costly repairs. Historically, simple materials like felt were used, but advancements in materials science have led to more durable and effective solutions.