What to do if windows start letting in air

What to do if windows start letting in air

Drafty windows are a common issue in apartments and houses. PVC windows are designed to be airtight, but rubber seals wear out, hardware can loosen, and installation joints may degrade. This guide explains how to identify the cause, perform quick fixes, and implement lasting repairs to restore comfort and energy efficiency.

Summary

• How to identify where the air comes from
• Quick DIY checks and tests
• Temporary fixes until repair
• Hardware adjustment and seal replacement
• When to call a professional
• Prevention tips

Signs and typical problem areas

• A steady stream of cold air along the sash perimeter when the window is closed.
• Difficulty closing or noticeable play in the sash.
• Visible gaps, cracked seals, or crumbling installation foam.
• Condensation differences near the frame compared to the middle of the glass.

Common causes include worn seals, misadjusted or failing hardware, building settlement, or poor original installation (insufficient foam or missing external sealing tape).

Quick DIY diagnostic checks

• Paper test: place a sheet of paper along the sash, close the window, then pull. If it slides out easily in several spots, there is leakage.
• Visual inspection: look for cracks, flattened seals, or gaps in the foam joint between frame and wall.
• Candle or lighter test (carefully): move a small flame along the perimeter to spot drafts by flame movement. Keep safety in mind and avoid flammable materials.

Temporary solutions

• Self-adhesive sealing tape for small leaks — quick and easy but temporary.
• Expanding foam for larger gaps (use carefully; requires trimming and finishing).
• Adjusting the latch/strike points to increase sash pressure — sometimes enough to stop minor drafts.
• Interior draft stoppers and heavy curtains as immediate comfort measures.

Temporary fixes help until a professional can assess the window; they are not always suitable for major installation defects.

Permanent repairs and recommended workflow

1. Full inspection by a technician: check frame geometry, seal condition, hardware function, and joint integrity.
2. Hardware adjustment: tightening and realigning the locking points to ensure even pressure around the frame.
3. Seal replacement: modern seals last 7–15 years and can be replaced without removing the glazing unit.
4. Re-seasoning the installation joint: repair or replace foam and apply internal/external sealant and sealing tape.
5. Frame or window replacement in case of severe deformation or persistent problems.

Materials and parts

• Seals: EPDM is durable and weather-resistant; TPE is softer and easier to install.
• Hardware: hinges, locking points, and keeps — worn parts are replaced or refurbished.
• Sealants and foam: use quality products from reputable brands; apply external sealing tape for long-term protection.

When to call a specialist

• If frame deformation or building settlement is suspected.
• If DIY adjustments do not stop the draft.
• When gaps are large or the installation joint has failed.
• For full perimeter seal replacement or structural fixes.

Prevention and care

• Inspect window seals twice a year (spring and autumn).
• Lubricate moving parts annually with recommended grease.
• Keep external sills and sealing tape in good condition.
• Avoid harsh chemicals on rubber seals.

Frequently Asked Questions

Q: How much does repair cost? A: Prices vary by region and complexity. Simple adjustments are relatively inexpensive; full seal replacement and joint work cost more. Typical ranges: hardware adjustment — from modest service fees; seal replacement — starting from around 60 EUR inclusive of materials and work, depending on window size and number.

Q: Is full window replacement always necessary? A: No. Most cases are solved by seal replacement or hardware adjustment. Replacement is needed if the frame is deformed or the glazing unit is damaged.

Q: How long does a typical repair take? A: Small repairs (adjustment, partial seal replacement) can be done in 1–3 hours. Joint repairs and insulation work require more time.

Q: Which seals are recommended? A: EPDM seals are a reliable choice for long service life and weather resistance. TPE seals are a more economical alternative.

Q: What to do in winter emergencies? A: Use heavy curtains, draft stoppers, temporary sealing tape, and localized heating while waiting for professional service.

If you need professional help, DK-Logi specialists can inspect your windows, propose the best solution (adjustment, seal replacement, or joint repair) and provide a cost estimate. Contact our support to schedule a visit.