High-quality, blade-grooved weather sealing provides a highly effective barrier against drafts, moisture, and pests. This type of seal is inserted into a precisely cut slot (the kerf) in a door or window frame, creating a tight, nearly invisible seal. An example would be a flexible silicone spline fitted into a kerf routed along the edge of a door jamb.
Effective perimeter sealing is crucial for maintaining comfortable indoor temperatures and reducing energy consumption. Minimizing air leakage can significantly lower heating and cooling costs while also improving sound insulation and protecting against water damage. Historically, less efficient methods like felt or foam strips were common. Modern advancements in materials science and manufacturing techniques have resulted in more durable and effective solutions, such as precisely engineered kerf-in seals.