When the UK rainy season hits, even well-fitted uPVC and aluminium doors and windows can start to leak, stick or let in draughts. This practical guide helps homeowners spot problems early and carry out simple repairs to protect their property and stay comfortable.

Why Rain Affects Your Doors and Windows

Heavy rainfall and persistent damp put extra pressure on seals, drainage channels and moving parts. Over time, gaskets flatten, sealant cracks, hinges drop slightly and drainage slots clog with dirt and leaves, allowing water to pool and penetrate the frame.

For modern uPVC and aluminium systems , most wet‑weather issues come down to three things: failed seals, blocked drainage, or poor alignment. Addressing these areas first usually solves common rainy‑season complaints like leaks, draughts and condensation.

Step 1: Inspect Frames, Seals and Drainage

Start with a visual inspection during or just after heavy rain:
•Check the inside edges of frames for damp patches, staining or mould. These usually indicate water ingress around the seals or through blocked drainage holes.
•Examine rubber gaskets and external sealant for cracks, gaps or areas where the material has pulled away from masonry. Replace damaged sections and re‑seal with high‑quality exterior silicone to restore a watertight barrier.
•Locate drainage slots in the bottom of uPVC frames and door thresholds and clear out debris using a small brush or piece of wire. Unblocked drainage allows water to escape instead of backing up into the frame.
This simple inspection often highlights quick wins that prevent minor leaks turning into costly repairs.

Step 2: Adjust Hinges and Hardware

Rainy‑season swelling in surrounding building materials can reveal alignment issues. If a door or window is hard to close, catches on the frame or leaves a visible gap for draughts to enter, basic adjustments usually help.
On uPVC and aluminium units, most hinges and keeps are adjustable with a screwdriver or Allen key. Tightening loose screws and slightly lifting or lowering the sash can restore a tight seal and reduce water ingress around the perimeter. Lubricate locks, hinges and handles with a silicone‑based spray for uPVC and an appropriate dry or light lubricant for aluminium to prevent sticking in damp conditions.

Step 3: Deal with Leaks, Draughts and Condensation

For active leaks, focus on seals and drainage first. Replace worn weather stripping and gaskets, then re‑seal any cracked external caulking around the frame. If water appears at the bottom of the frame, recheck drainage holes and channels and keep sills wiped down after heavy rain to avoid standing water and mould growth.
Draughts around doors and windows are usually due to flattened seals or misaligned sashes. Fresh weatherstripping every few years, plus careful hardware adjustment, can significantly cut cold air and improve energy efficiency. For misting between panes, the problem is typically a failed double‑glazed unit rather than a simple rainy‑season issue; in these cases, replacing the glass unit is often the only long‑term solution.

When to Call a Professional in the UK

Most UK homeowners can safely handle cleaning, lubrication, small hinge adjustments and basic seal replacement. However, if leaks persist after these checks, the frame is badly warped, or double‑glazed units are blown, a specialist glazier or window repair company should assess whether repair or full replacement offers better value. Professionals can also test security, recommend upgraded locking systems and provide periodic maintenance to keep uPVC and aluminium installations performing well throughout the wettest months.

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