What causes aluminium windows to leak water and installation tips

Water leakage is one of the most frequent issues for aluminum windows and doors. In many cases, leakage comes from poor installation and bad drainage design rather than defective aluminum profiles.

Common leakage reasons:

1.Missing or blocked drainage holes: Rainwater trapped inside profile chambers overflows into the room.

2.Incomplete PU foam filling between frame and wall.

3.Low-quality weather sealant cracked under UV exposure.

4.Window frame installed with reverse slope, making water flow inward.

5.Improper assembly of glazing beads and rubber gaskets.

Installation guidelines to prevent leakage:

1.Drill drainage holes and pressure equalization holes in profile cavities.

2.Fill wall gaps with PU foam, then apply high-grade exterior silicone weather sealant.

3.Install frame with slight outward slope to drain rain outside.

4.Carry out on-site water spray test after installation.

5.Select salt-resistant sealant for coastal projects.

Sales tip: On-site water spray test can be written into project contract to reduce after-sales disputes.

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