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Common Problems and Quality Inspection Methods of Casement Windows

2025-01-12

1. Common quality problems

Uneven window frame: The four corners of the window frame are inconsistent or uneven up and down, which will affect the beauty and opening force of the window.

Non-vertical glass: The verticality of the glass will affect the air tightness and waterproofness of the casement window.

The window sash is not tightly closed: The window sash cannot fit the window frame tightly, which will lead to a decrease in air tightness and waterproofness.

Air leakage from the window sash: The gap between the window sash and the window frame will cause cold air to enter the room from the outside.

The opening force of the window sash is too large or too small: Too large opening force will affect the life and use of the casement window, and too small opening force will make it impossible to open the window comfortably.

Casement Windows

2. Quality inspection method

Window frame flatness check: Use a ruler or a flat plate to check whether the four corners and the top and bottom of the window frame are flat, and the error is required to be less than 3mm.

Window glass verticality check: Use a goniometer or a square ruler to check whether the glass is vertical, and the error should not exceed 3°.

Window sash tightness check: Open the casement window and use a caliper or a ruler to measure the spacing of the window edges, and the error is required to be less than 3mm.

Window sash air leakage check: Use a fire source such as a lighter or candle to move between the window sash and the window frame, and observe whether there is a flickering flame to confirm whether the window is leaking.

Window sash opening force check: Use a pressure gauge to measure the force of opening or closing the window sash, and the force is required to be between 20N-40N.

Casement Windows

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