The original wood windows in Chicago greystones and two-flats can outlast their replacements — if someone maintains them. Here is how landlords and property managers restore sash cords, re-glaze loose panes, and seal up before heating season.
Walk into almost any pre-1940 building in Logan Square, Wicker Park, or Andersonville and you find the same thing: original wood double-hung windows, painted over a dozen times, half of them painted shut, a few with sashes that drop like a guillotine.
Owners often assume the answer is replacement. Sometimes it is. But old-growth wood sashes in Chicago greystones and two-flats are frequently in better shape than the vinyl units sold to replace them, and the parts that actually fail — cords, glazing putty, weatherstripping — are cheap and repairable.
Late August is the right moment. Contractors are not yet buried in heating calls, the wood is dry enough for glazing compound to cure, and you are well ahead of the first cold snap. Waiting until a tenant complains in November means emergency rates.
It helps to know what is inside the wall. A traditional double-hung window has two sashes that slide vertically in tracks. Each is connected by a braided cotton cord running over a pulley at the top of the jamb, down into a hollow cavity beside the frame, where it ties to a cast-iron counterweight.
The weight is matched to the sash, so when the system works the window stays wherever you put it — no props, no slamming. When a cord snaps, the weight drops to the bottom of the pocket and the sash becomes dead lifting weight.
Access is through a small removable panel in the lower jamb called a pocket cover. In a Ravenswood or Rogers Park building it may be invisible under six layers of paint, but it is there. Knowing this changes the conversation with a contractor: a broken cord is a thirty-minute repair, not a reason to gut the opening.
Vintage window problems fall into a short list.
Broken sash cords are the most common. Cotton cord has a service life measured in decades, and most buildings are well past it. Tenants prop the window with a book, or stop opening it.
Painted-shut sashes come next. Every repaint that skips masking the sash channel adds another bond between sash and stop — a habitability and egress issue, not just an inconvenience.
Failed glazing putty is third. The hard gray compound holding glass to sash dries, cracks, and falls out, leaving glass rattling and water tracking into the wood.
Rotted sills and lower rails follow, usually where glazing failed years earlier. Finally, flattened weatherstripping — what tenants feel as a draft even when everything else is sound.
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