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The Corn Exchange building 3rd and Arch St. in old city Philadelphia

Pictured here are custom made window sash for Linode Inc at the Corn Exchange building.  The customer wanted window sash with insulated glass.  I usually steer clear from installing insulated glass units in historic sash, but since these units did not have a muntin grid, it was feasible to do.  To offset the now heavier sash units, I used pullman tapes instead of weights and chains.  These tapes had to be utilized because the use of jamb liners, common in many window replacements are cheap and fail fast.  I was also able to match the existing bead profile of the original windows.

manufactured window sash: The Story
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