How to Maintain Your UPVC Windows and Doors: A Simple Seasonal Guide

One of the most celebrated advantages of UPVC windows and doors is how little maintenance they require compared to wooden or aluminium alternatives. Unlike wood, which needs regular painting and anti-termite treatment, or aluminium, which may need repainting as its finish degrades, UPVC is designed to look and perform like new for decades with minimal upkeep. However, that does not mean UPVC windows need no attention at all. A little periodic care — aligned with the seasons — will ensure your UPVC windows and doors perform optimally and look beautiful throughout their long lifespan. Here is your simple seasonal maintenance guide.

Pre-Monsoon Maintenance: Prepare for the Rains (April–May)

Kolkata's monsoon typically arrives in June, which means April and May are the ideal time to prepare your windows and doors for heavy rainfall:

• Inspect all rubber seals and gaskets around your window frames for signs of cracking, shrinking, or gaps. If you find any damaged seals, have them replaced before the monsoon begins.
• Clean the drainage channels and weep holes at the bottom of your window frames. A thin wire or toothpick is usually sufficient to clear any blockages.
• Check all window and door locking mechanisms to ensure they are working smoothly and that the frame closes to a tight, secure seal.

Monsoon Maintenance: During the Rains (June–September)

During the monsoon season, there are a few simple things you can do to keep your UPVC windows in top condition:

• After particularly heavy rainfall, check for any water that may have accumulated in the frame channels and ensure the drainage holes are clear.
• If you notice any water staining on the walls near windows or on the window sill, investigate promptly — this could indicate a seal failure or a blockage in the drainage system.
• Regularly wipe down the frame and glass with a clean, damp cloth to remove any dirt, grime, or mould spores. Avoid using abrasive cleaners or rough scouring pads, which can scratch the UPVC surface.

Post-Monsoon Maintenance: Clean and Check (October–November)

Once the monsoon is over, give your windows and doors a thorough cleaning and inspection:

• Wash the frames with mild soap and warm water, paying attention to the corners and joints where dirt tends to accumulate. Rinse with clean water and dry with a soft cloth.
• Lubricate all moving parts — hinges, sliding tracks, and locking mechanisms — with a UPVC-compatible silicone-based lubricant. Do not use oil-based lubricants like WD-40, as these can attract dust and grime and may degrade rubber components over time.
• Check that all hinges are secure and that the window or door hangs correctly in the frame. If a door or window panel seems to be sagging or not closing squarely, the hinges may need adjustment.

Summer Maintenance: Protect and Clean (March–May)

Kolkata's summer heat can cause thermal expansion and contraction in all building materials, including UPVC:

• Ensure that all frames are properly adjusted and that no components are under undue stress.
• Clean the glass panels inside and out with a good glass cleaner and a soft lint-free cloth.
• Check that the UV-protective coating on the glass is intact and that there are no chips or cracks in the glass.
• Inspect the handles and locks for any signs of wear, and replace any worn or damaged hardware promptly.

General Tips for Long-Lasting UPVC Performance

• Never use solvents, bleach, or abrasive chemicals on UPVC frames, as these can damage the surface finish.
• Never paint UPVC frames — they are designed to retain their colour permanently and painting over them can interfere with the material's thermal performance.
• For any significant repair, adjustment, or hardware replacement, always contact a qualified UPVC service technician.

With just a few hours of care each year, your Promiplast UPVC windows and doors will continue to look and perform like new for twenty years or more.