How to properly replace windows in 602 series apartments

Introduction

Replacing windows in 602-series apartments requires attention to specifics: thin panel walls, shallow mounting depth, and typical window niches. This guide covers preparation, measurements, selecting profiles and glazing, safe dismantling, installation, finishing, and a practical FAQ for acceptance and longevity.

Why 602-series apartments are special

• 602 is a Soviet-era panel house layout with characteristic concrete panel joints and window recesses.
• Original frames were often installed to narrow concrete edges, limiting space for modern profiles.
• Issues such as thermal bridges and moisture near the sill are common and must be addressed.

Key considerations before replacement

• Inspect the opening for cracks, chipped concrete, or corroded anchors.
• Check ventilation grille positions and radiator distance under the window.
• Measure the window niche depth relative to the exterior facade layer.
• Verify whether building management or HOA approval is required for façade work.

Preparation and measuring (step-by-step)

1. Clear the work area and protect furniture.
2. Remove internal finishes around the window only if needed for accurate measurement.
3. Measure width and height in three places (top, middle, bottom and left, center, right) and record the smallest dimensions.
4. Measure mounting depth to the exterior face to determine sash placement and drainage requirements.
5. Photograph the opening and note moisture stains or structural damage.

Choosing frame and glazing

• PVC profile: 70–80 mm multi-chamber systems balance insulation and size for 602 panels.
• Glazing: energy-efficient double or triple glazing with argon fill and low-E coating; choose 44–36 mm or more in colder climates.
• Hardware: anti-burglary options, multi-point locking, and three-axis adjustment. Micro-ventilation is useful for sealed apartments.
• Sills and drip caps: durable materials with outward slope and proper sealing.

Dismantling old windows and preparing the opening

• Start by removing sashes and glass to lower weight.
• Remove the frame carefully to avoid damaging the concrete; if edges are ruined, plan for repair or reinforcement plates.
• Clean and dry the opening; repair cracks with suitable mortar.
• If mold is present, treat with an antiseptic and resolve the moisture source.

Installation: core rules

1. Use mounting plates or anchors and always check plumb and level before final fixing.
2. Leave a consistent installation gap (typically 10–20 mm) between frame and opening depending on profile.
3. Temporary fixings allow fine adjustment; then fasten permanently.
4. Sealing: exterior joint must be elastic and watertight (sealant or vapor-permeable tape); interior should include vapor barrier and insulating foam or PSUL tape.
5. Install drip cap and ensure exterior drainage is directed away from the wall to prevent moisture ingress.

Interior finishing and sill installation

• Interior slopes can be finished with plasterboard or PVC panels; ensure vapor barrier and neat joints.
• Position the sill with slight outward tilt and leave expansion gaps.
• Adjust hardware, test seals, and verify smooth operation of vents and locks.

Permits, timing, and costs

• Approval: check with building management or HOA if the façade appearance changes.
• Timing: replacing windows in an average apartment (3–4 windows) typically takes 1–2 days for removal and 1–2 days for installation and finishing, depending on repairs.
• Cost: depends on profile, glazing, and any structural repairs. Ask for an itemized estimate.

Handover checklist

• Frame size and color match contract.
• No cracks or chips in the opening.
• Frame level and plumb; no warps.
• Proper exterior sealing and drip cap installed.
• Smooth operation of sashes and secure locking; no drafts.
• Delivery of warranty and care instructions.

FAQ

How much does it cost to replace a window in a 602 apartment?

Cost varies by profile, glazing, and repair needs. Request an on-site quote for precise pricing.

Should I replace the sill and slopes?

Replace if damaged or to improve insulation and appearance. New sills help manage condensation and heat loss.

How to avoid cold bridges?

Correct frame depth and exterior sealing are essential. Avoid leaving unprotected foam or gaps that allow airflow.

Is HOA approval required?

Often yes, if external appearance changes. Check local rules before starting work.

How long will the new window last?

With proper installation and maintenance, PVC frames last 20–30 years; hardware lifespan depends on usage and adjustments.

Conclusion

Replacing windows in 602-series apartments is manageable with careful measurement, appropriate selection of profile and glazing, and professional installation with correct sealing. Request a detailed estimate, clarify approvals with your HOA, and follow the acceptance checklist to ensure long-term comfort and energy savings.