We see a lot of old buildings in our work in eastern Pennsylvania and western New Jersey. Many are built of stone, which has a unique elegance but also presents some production challenges - for example, how best to install windows and doors, the components most likely to fail.On a recent project, we were asked to repair the windows and doors of a 1760s Georgian stone building. In some cases, we were able to replace just the thresholds, sills, and sash, but many of the openings required complete replacements. In doing this kind of work, we've found that taking cues...

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