Please check out this video: How to Measure for a New Jamb Liner. See minute 1:00 of video for measuring instructions. See minute 2:16 of video to determine whether you have a "residential tilt" or "challenger series - standard" jamb liner.
Tom explains how to measure for new jamb liners for BiltBest double hung windows. Please contact us if your BiltBest Windows require replacement parts; we are located in the same community as BiltBest Windows and employ many former BiltBest Windows employees.
sales@biltbestreplacementparts.com
866-305-5577