PVC windows for houses of series 104: practical tips

PVC windows for houses of series 104: practical tips

Series 104 panel apartment buildings are a common Soviet-era typology in Latvia. Window openings in these apartments often have non-standard dimensions, limited installation space and specific ventilation characteristics. This guide gives practical recommendations on selecting, measuring, installing and maintaining PVC windows for series 104 apartments.

What to consider for 104-series apartments

• Openings may be irregular due to panel joints and old interior finishes; precise measurement is essential.
• Limited space for external sills and insulation — choose solutions that fit the available mounting depth.
• Replacing windows can affect the natural ventilation; plan for adequate air exchange.

Choosing frame profile and insulating glass units

• Profile: choose 5–6 chamber profiles with a 70–90 mm installation depth to improve thermal and acoustic performance.
• Reinforcement: steel reinforcement is important for larger or non-standard sashes to ensure rigidity.
• IGU (Insulated Glass Unit): energy-efficient double IGUs are common (e.g., 4-16-4 or two-chamber 4-16-4-16-4). For better sound insulation consider laminated or thicker glass and argon filling.
• Hardware: tilt-and-turn mechanisms with micro-ventilation and opening limiters. Anti-burglary fittings increase security.

Measuring and preparation

• Professional measurement is mandatory: take three width and height measurements and note deviations.
• Record the thickness of the wall, position of the panel joints and the condition of internal and external reveals.
• Define the mounting gap (installation space) in advance to choose the correct profile and insulation thickness.

Installation tips for panel buildings

• Carefully dismantle old frames to avoid damaging the panel seam.
• Fill the installation gap with PU foam and seal with tape and silicone. Use vapor-permeable tape outside and vapor-proof tape inside.
• Ensure the frame is level and plumb, with proper support points and anchors to the concrete panel.
• In cold weather use adapted technologies to reduce heat loss during replacement.

Ventilation and condensation

• New airtight windows can reduce natural air infiltration. Install trickle vents or mechanical ventilation if needed.
• Use the micro-ventilation mode available in modern fittings and ventilate rooms regularly.
• Proper installation of reveals and selecting energy-efficient IGUs helps reduce condensation.

Insulation and finishing

• Internal reveals: use insulated drywall systems or foam boards with vapor barrier on the warm side.
• External finishing: apply vapor-permeable materials to protect the foam and allow moisture escape.
• Window sills: use moisture-resistant materials and leave a small ventilation gap where appropriate.

Maintenance tips

• Clean frames with a soft cloth and mild detergent; avoid abrasive cleaners and solvents.
• Lubricate moving hardware twice a year with silicone spray.
• Check seals and joints annually; replace worn gaskets to maintain airtightness.

Summary (6–10 points)

• Series 104 openings require precise measurement and customised solutions.
• Choose 5–6-chamber profiles and energy-saving IGUs for better performance.
• Reinforcement and quality fittings are critical for durability and security.
• Use vapor-permeable tape outside and vapor-tight tape inside during installation.
• Provide ventilation via trickle vents or controlled ventilation systems.
• Proper reveal finishing prevents condensation and heat loss.

Frequently Asked Questions (FAQ)

1. Can I use standard-size windows for a 104-series apartment?

Usually not. Standard sizes rarely match the actual opening. Order windows after on-site measurement to ensure fit.

2. Is a triple-glazed unit necessary?

Triple glazing improves thermal and acoustic performance, but it increases weight and cost. For cold or noisy locations it often pays off.

3. How to prevent air quality issues after window replacement?

Install a trickle vent or a controlled ventilation system; keep micro-ventilation enabled during the day.

4. What is the correct way to seal the installation gap?

Use polyurethane foam as filler, seal externally with vapor-permeable tape and internally with vapor-tight tape or silicone.

5. Common mistakes to avoid?

Incorrect measurement, neglecting ventilation, uneven anchoring of the frame and poor finishing of reveals.

If you need help measuring or selecting a system for a typical apartment of series 104, our specialists can provide on-site consultation and an installation plan.