Specialized seals applied to the moving parts of traditional vertically sliding windows prevent drafts, reduce energy loss, and dampen sound. These seals, typically made of materials like foam, rubber, felt, or metal, fill the gaps between the sashes and the frame. For example, compression seals expand to fill the space when the window is closed.
Effective sealing significantly improves thermal performance in older homes, leading to lower energy bills and a more comfortable living environment. Historically, these types of windows relied on less effective methods, such as putty or rope, to block drafts. Modern materials and application techniques offer superior performance and longevity, preserving the aesthetic appeal of period properties while enhancing their energy efficiency.
