Aluminum Sliding Windows — Heavy-Duty, Leak-Free

Sliding window leaks are almost always caused by inadequate track depth, absent or blocked weep holes, degraded wool-pile weatherstripping, or non-structural silicone applied to the frame-to-wall joint. Our Series 900 heavy-duty tracks have factory-installed weep holes and deep channels that expel water under wind pressure before it can enter the room.

A standard two-panel sliding window provides 50% of the total glass area for ventilation when one panel is open — the stationary panel always blocks the other half. For maximum airflow, we recommend casement or awning windows. For wide openings, three-panel sliding configurations can provide up to 67% opening width.

In Philippine conditions (UV exposure, humidity, salt air near coasts), wool-pile weatherstripping typically degrades after 3 to 7 years. Signs of failure include increased drafts, window leaks in rain, and visible flattening of the pile. Replacement is inexpensive — we carry standard pile sizes compatible with all common aluminum window series.

The easiest conversion is to replace sliding panels with fixed glass to create a picture window — this is common when improving thermal or acoustic performance. Converting to casement or awning windows within the same rough opening is possible but requires fabricating an entirely new frame and involves tile or plaster patching around the perimeter.