The superior performance of Sheffield® windows starts with innovation

Every precision-engineered component contributes to superior energy savings. The multi-chamber design helps trap dead air to produce an effective insulating barrier, while extra-thick, fusion-welded frames and sashes provide superior structural strength and create a permanent barrier against air and moisture infiltration, adding up to greater energy sa

Sheffield windows feature a sloped sill helping to prevent air and water infiltration while maintaining a timeless, detailed appearance. Beveled mainframes on double-hung and sliding windows complement any home style.

Best yet, Sheffield windows are covered by Alside’s impressive Lifetime Limited Warranty* for complete peace-of-mind.

Sheffield Features

• * Quad 4 weatherstripping at the header
• * Triple-barrier weatherstripping between sash and jamb
• * Sloped sill ensures quick water drainage
• * Compression bulb seal at the sill for further weather protection
• * Hidden screen track produces clean lines
• * Fully extruded lift rails for strength and durability