Use this guide when a uPVC window is stiff to lock, rattles in the wind, drops at the corner or lets in a cold draught when closed. Have a soft brush, a cloth, warm soapy water, a light machine oil or silicone spray, a set of hex keys and a cross-head screwdriver ready.
Step by step
Do the paper test first
Close a sheet of paper in the window and lock it, then try to pull it out at several points around the frame. Where it slides out easily, the seal is not compressing and that is where cold air gets in. Mark these spots with a small piece of masking tape so you know where to adjust and which seals to check.
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