WeatherLok Series 3100

Single Hung, Sliders, and Picture Windows

Value Worth A Look

This is fundamentally basic window with a lot to offer. Superior workmanship translates into reliability and durability. Loaded with features to ensure energy-efficiency and ease of operation, the Series 3100 lets you enjoy the freedom from maintenance that vinyl guarantees.

Standard Features

  • All-welded frame and sash corners.
  • Insulated glass panels with optimum thermal air space featuring Warm Edge Spacer System
  • Double sash locks come standard with all windows
  • 271/4" or wider.
  • Aluminum-reinforced lock rail and meeting rails add strength.
  • Bottom sash tilts in for easy cleaning.
  • Block & Tackle balance system.
  • Sloped sill allows easy water run-off.
  • Factory-installed half screen comes standard.
  • Factory applied wrap-around foam.
  • Beveled exterior for attractive appearance.
  • Pre-drilled installation holes.
  • Head expander and sill angle are included.
  • 2 5/8" jamb width.


  • Low-E Glass and Argon Gas for additional efficiency
  • Ultra Low-E Argon (May be required for Energy Star rating; may not be applicable in all zones)
  • Low-E glass
  • Obscure glass
  • Double strength glass
  • 5/8" or 1" contoured grid
  • 3/4" or 5/8" flat or diamond grid
  • Custom sizes cut on 1/8" width and height
  • Factory mulling of twins and triples


Slider Window

Series 3100 sliding windows offer the same outstanding features of Series 3100 single hung windows, plus:

  • Tandem rollers ride easily along friction free glide channel
  • Integrated glide rail for easy sash opening and closing
  • Available in 1/4 - 1/2 - 1/4 or 1/3 - 1/3 - 1/3 configurations
  • XO or OX 2-lite styles available
  • Half screen comes standard
  • 2.75" jamb

Proud of our Products. 
Proud of our People.

Watch this video for a tour of our world class manufacturing facility in action.

Error Message