Sliding Windows

A search for sliding windows Lehigh Valley almost always starts in a ranch or split-level. The postwar streets of Whitehall, the 1960s plats off Route 248 in Palmer, and the split-levels climbing the hills of Emmaus were built with wide, low openings that a double-hung never suited. The original aluminum gliders that filled them were light, sweated all winter, and rode on a track that collected forty years of grit. Owners replacing them are not chasing a new look. They want the same wide view with a sash that moves on one finger and a frame that stays dry in January.

A glider is really a double-hung turned on its side. One or both sashes ride in a track along the sill, and the meeting stile interlocks where they pass. Because nothing has to be lifted against gravity, the motion stays easy for anyone whose shoulders no longer love a heavy sash, and the window can be as wide as the wall allows without growing tall. In a kitchen in a Bethlehem Township rancher, that means a long horizontal opening above the counter that frames the backyard instead of chopping it into two narrow slots.

The regional test for a slider is the sill. Meltwater, road salt mist from a corner lot, and the spring pollen that blankets everything from Nazareth to Quakertown all end up in the track. Older units trapped it; a good modern one drains it through weep holes and keeps the rollers above the water line. Wind off Blue Mountain works at the interlock the same way it works at a double-hung meeting rail, so the depth of that interlock and the quality of the pile weatherstrip matter more here than the frame color ever will.

Sliders carry large sashes, so the glass package deserves attention. A Low-E coating tuned for heating climates lets winter sun into a south-facing family room while keeping the room from bleeding heat back out at night. On a west wall that takes the full August afternoon, a coating that blocks more solar gain is the better trade. Two panes with a gas fill and a warm-edge spacer are the baseline; a heavier triple-pane sash is possible, but ask how much force it adds at the handle.

Rollers and track shape decide whether the window still glides in ten years. Look for rollers that ride on a raised rail rather than dragging in the channel, and for a track you can lift the sash out of for cleaning. The lock should engage at the meeting stile with a positive click, and a wider sash benefits from two of them. Screens sit on the exterior and cover the opening half; if pollen season bothers you, confirm the screen frame seals to the jamb rather than resting loosely in a clip.

Most gliders in the Lehigh Valley replace other gliders, so the opening is already the right shape. The question is whether the old aluminum frame stays. Inserting into it is fast, but that frame is a cold bridge that sweated for decades and may have rusted the fasteners behind it. Your matched installer will usually recommend pulling the whole unit and setting a new frame directly to the rough opening, especially on a sill that shows staining or soft drywall below.

Installation day for a slider is a two-person job because the sash is wide and awkward rather than heavy. The old unit comes out, the sill is checked for level in both directions so the sash does not drift open or closed on its own, and the new frame is shimmed, fastened, foamed, and sealed. Because the sill carries the rollers, the crew will spend more time getting it dead level than on any other style. Exterior trim is capped or wrapped, and the weeps are checked to be sure they are open before the crew leaves.