Insulating an apartment with PVC windows in a brick Khrushchyovka

Insulating an apartment with PVC windows in a brick Khrushchyovka

Brick Khrushchyovka apartments are common across Eastern Europe. Upgrading to modern PVC windows and performing targeted insulation work noticeably improves comfort, reduces drafts and lowers heating bills.

Assessing the current condition

• Inspect the profile and glass unit: single-, double- or triple-glazed, presence of warm-edge spacer and gas fill.
• Check slopes, seams around the frame and the sill — heat often escapes there.
• Evaluate ventilation: airtight PVC windows require a controlled fresh-air inlet.

Tip: a thermal camera or a simple paper test helps find air leaks quickly.

Choosing the right PVC window

• Profile: 5–6 chamber profiles provide better thermal resistance.
• Insulated glass unit (IGU): double- or triple-glazed IGU with Low‑E coating and argon fill.
• Warm-edge spacer reduces cold bridges around the glass perimeter.
• Hardware and seals: multi-point locking and quality gaskets increase airtightness.

Correct installation is crucial

• Proper removal of the old window and installing the new frame with foam, vapor barrier on the inside and moisture barrier outside.
• The installation gap must be insulated correctly and protected from both sides.
• Adjust sash pressure and verify seal compression.

Insulating slopes and the windowsill

• Insulate interior and exterior slopes with mineral wool or extruded polystyrene (XPS), then finish with plaster or trim.
• Ensure the sill has a thermal break and does not block heat circulation from the radiator.

Wall insulation options

• Internal insulation: EPS or mineral wool under a finish layer — faster and cheaper but reduces room space and can create dew point issues.
• External insulation (ETICS): most effective for whole-building thermal upgrade, but requires approvals and higher costs.

Ventilation and heating after sealing windows

• Install air inlets or use micro-ventilation mode to prevent dampness and mould.
• Rebalance radiators — after replacing windows you may need thermostatic valves or adjustments to avoid cold spots.

Additional interior measures

• Heavy curtains, thermal blinds or insulated roller blinds help reduce heat loss through windows.
• Sill insulation and radiator enclosures with vents enhance heating efficiency.

Timeframe and cost

• Window replacement: a single window typically takes a few hours to a day (including removal and cleaning).
• Full package (windows + slopes insulation): 1–3 days per room depending on scope.
• Costs depend on profile class, IGU type and work volume — get estimates from several suppliers.

Common mistakes

• Poor sealing of the installation gap.
• No provision for fresh air after sealing windows.
• Choosing inadequate IGU for cold climates (e.g., single glazing).

FAQ — Frequently Asked Questions

Do I still need wall insulation after installing PVC windows?

PVC windows reduce losses through window openings but walls, floors and ceilings remain major heat loss pathways. If walls are uninsulated or cold, consider external or internal insulation based on budget and regulations.

Which IGU is best for a brick Khrushchyovka?

A double-glazed Low‑E IGU filled with argon is the sensible choice. In very cold regions, a triple-glazed unit may be beneficial.

Can I install airtight windows without ventilation?

No. Lack of proper ventilation can cause condensation and mould. Install fresh-air vents or use controlled ventilation strategies.

How much can I save on heating?

Savings vary widely: typically 10–30% reduction in heating costs when replacing old windows with quality PVC units and sealing gaps.

What matters more: the profile or the glass?

Both matter. The profile reduces heat transfer around the frame, while the IGU determines losses through the glass surface. Choose a balanced system.

Conclusion

Upgrading to quality PVC windows in a brick Khrushchyovka, combined with careful installation and attention to slopes, ventilation and heating balance, is an effective way to improve comfort and reduce energy costs.