What Causes a Sliding Window to Stick?

Trapped Debris

• Before trying any repair methods, check the track located underneath the window. Look for any signs of debris that might block the window. A small toy from your child or pet may block the window, even something as small as a glass marble or a piece from a game. Check the window for signs of buildup from dust and pet dander. As the dust and debris builds up inside the window track, the window sticks. Cleaning the window with a small amount of all-purpose household cleaner should solve the problem.

Humidity Problems

• If the window features wood construction, then humidity is likely the culprit behind your problems. Humidity levels cause a freeze-melt cycle, which leads to expansion and contraction. The frame of the window expands, and then, as the temperatures and humidity levels change, the window contracts. Every time the window frame shifts, its location on the track changes. Sliding a small amount of paraffin wax along the track and the bottom of the window frame lubricates the window and helps it slide properly.

Paint Buildup

• Older homes often feature older windows. Every time a homeowner painted the inside or outside of the house, he likely painted the window frame. Each layer of paint creates buildup on the window frame, and any small splashes create blocks on the window track. Even thin layers of paint on the window can stop it from sliding correctly. Solve the problem by applying paint stripper to the bottom of the window and peeling off the paint, using a small, flat chisel.

Foundation Issues

• Problems with opening and closing or sliding windows may indicate a problem with your home’s foundation. As the foundation settles and changes, it affects the windows because the frame adjusts to an angle or a slant. Check the caulked areas of your home, looking for signs of caulk peeling away or uneven caulk. If the issue relates to the foundation, then you must consult a professional architect or engineer. This professional will determine if the foundation has any serious problems and will help you to decide on the best course of action.