Why the Original Windows Stick, and What Is Actually Worth Fixing

The complaint that starts most window conversations is not energy performance. It is that something does not work. A bedroom sash that needs a shoulder behind it. A kitchen slider that takes two hands. A lock that will not turn because the two halves no longer line up.

Some of that is a cheap part. Some of it is the window telling you it is finished. Knowing which is which saves money in both directions, because people replace repairable windows and repair unrepairable ones with about equal frequency.

Sashes that stick or drop

A single-hung sash is held wherever you leave it by a balance, a spring mechanism inside the jamb that counterweights it. When a balance fails the sash gets heavy, slams shut, or refuses to stay up.

Balances are a wear part and a replaceable one. On a window whose frame is sound, replacing balances is a genuine repair and a cheap one.

What is not repairable is a frame that has corroded or racked. If the sash binds in a way that changes as you move it up the opening, the frame is no longer square, and no new balance fixes geometry.

Sliders that need a shove

A horizontal roller rides on wheels in a bottom track. Two things kill them and they usually happen together: grit works into the track and the rollers wear flat or seize, at which point the sash stops rolling and starts dragging.

New rollers and a properly cleaned track will restore a sound window. What that will not fix is a track worn into grooves by years of dragging, which is common on originals and which means the sash will never ride cleanly again.

Run a finger along the bottom track. Smooth is a repair. Grooved is not.

Locks that no longer meet

A lock that will not engage is almost never a broken lock. It is the sash sitting a few millimeters lower or further forward than it used to, so the two halves miss each other.

That is worth taking seriously for a reason beyond convenience. A window that will not lock is a window that will not seal properly under wind pressure, and the seal is a structural function on a Florida opening, not just a draft measure. It is also, obviously, a security problem.

Whistling in a squall

Air moving through a gap, not through glass. Usually failed or compressed weatherstripping at the meeting rail, sometimes a sash that no longer pulls tight because the lock is not engaging.

Weatherstripping is replaceable. A sash that will not close tight because the frame has moved is not.

The line

Repair is the right answer when the frame is sound and the problem is a part: balances, rollers, locks, weatherstripping, screens, and glazing seals on a single-pane unit.

Replacement is the right answer when the frame itself has gone: corrosion in the aluminum, racking out of square, a sill that no longer drains, or a sealed unit that has fogged in a window old enough that matching glass is a special order.

The practical rule is that once two or three of those overlap in the same opening, repair stops being cheaper over any horizon worth planning on. And once several openings in the same house are all at that point, which they usually are because they were all installed in the same month, the whole-house arithmetic starts to look different from the one-window arithmetic.

One thing worth doing regardless

Clear the weep holes. Every window frame and slider track has small drainage openings that let water that gets in find its way back out. Blocked weeps are the single most common cause of a window that leaks indoors, and clearing them takes a few minutes and no skill.

A window that leaks in wind-driven rain but is dry in ordinary rain is almost always a drainage problem rather than a seal problem, and that is one you can fix yourself before anybody quotes you anything. If it persists after the weeps are clear, a free measured quote will tell you what you are looking at.