Sheffield® Fusion-Welded Vinyl Windows

Ultra-Premium, Custom-Made Windows

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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 barrier, while the extra-thick, fusion-welded frame and sashes provide superior structural strength and create a permanent barrier against air and moisture infiltration, adding up to greater energy savings – and lower utility bills.

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

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

*See printed warranty for complete details

Features and Benefits

  • The multi-chamber design of the Sheffield Window helps trap dead air to produce an effective insulating barrier
  • Fusion-welded frame and sashes provide superior structural strength and create a permanent barrier against air and moisture infiltration
  • Ensuring easy operation, the constant force balance system and heavy-duty operating hardware continue to operate perfectly, even after decades of regular use
  • Heavy-duty SteelForce™ reinforcement is placed within the sashes at the meeting rails to ensure extra protection at this very critical and often used location
  • The Intercept Spacer System helps reduce conducted heat loss through the window and is better at retaining insulating gas than many conventional designs
  • Triple-barrier weatherstripping between the sash and jamb for superior protection from air and water infiltration
  • Sloped sill helps prevent water and air infiltration, forcing water to drain to the exterior of the window
  • Optional ClimaTech insulated glass packages available. Consult your window professional for the optimal glass package required for your home and climate zone
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Product Availability

This product is available in our Eastern Distribution area.
Eastern Availability



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    1. Vinyl frame and sashes will neverchip, peel,crack or warp. Made with premium raw materials, the vinylcolor is formulated throughout so the beautiful luster lasts.
    2. Multi-chambered sash and mainframe create insulating air spaces for thermalefficiency.
    3. Quad 4 weatherstripping at the header adds greater protection from theelements.
    4. Insulated glass unit featuring double-strength glass with optimal air space improves year-round performance.
    5. PPG Intercept Warm-Edge Spacer System maximizes thermalefficiency and the life of theinsulated glass unit.
    6. Interlock at sash meeting rails creates a super-tight seal against airinfiltration, providing security, comfort and well-being.
    7. Steel reinforcement adds strength at the meeting rails.
    8. Drop-in glazing provides energyef iciency as well as interior aesthetic appeal.
    9. Compression bulb seal at thesillcreates an all-season weather barrier sealing tightly against dust, dirt and air infiltration.
    10. Sloped sill forces waterto drain to theexterior of the window.
    11. Hidden screen track forclean lines and added beauty.
    12. Fully extruded liftrails provide strength and stability foreasy operation.
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  • ClimaTech® insulated glass packages 
  • Designer grids enclosed within the insulated glass unit for easy cleaning 
  • Colonial, diamond and prairie grid patterns available along with V-grooved glass
  • White, Beige, Rich Maple, Light Oak, Dark Oak, Foxwood and Cherry interior color options
  • White, Beige Architectural Bronze, Hudson Khaki, Desert Clay, English Red, Forest Green, American Terra and Castle Gray exterior color options
  • Simulated Divided Lites (SDLs) recreate historical true divided lites—small, individual panes of glass separated by muntins and mounted in a frame
  • Full screens available (Full screens are standard on exterior color-finished windows)
  • Obscure glass options are also available
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