Frequently asked questions about plastic windows

Summary

• What plastic (PVC) windows are made of
• How to choose profile and glazing for Latvia's climate
• How to prepare for measurement and installation
• Maintenance tips and routine checks
• Common faults and how to fix them
• Warranty, lifespan and when to replace components

Introduction

Plastic (PVC) windows are a common choice in Latvia thanks to their thermal performance, durability and low maintenance. This guide answers the most frequent questions about selection, installation, operation and maintenance so you can make an informed decision and keep your home comfortable.

What a plastic window consists of

• Profile (PVC frame and sash) — the structural element.
• Insulated glazing unit (IGU) — single, double or triple chambers with spacer and desiccant.
• Hardware — hinges, handles, locks, ventilation fittings.
• Seals — rubber or synthetic gaskets between sash and frame.

Choosing profile and glazing for Latvia

• For typical apartments, a double-glazed (two-chamber) IGU with argon fill and low-e coating is usually sufficient.
• For exposed facades or poorly insulated houses, choose a triple-glazed IGU and a profile with ≥70 mm installation depth.
• Look at the Uw value (thermal transmittance): the lower the Uw, the better the insulation.

Preparing for measurement and installation

• Book a professional measurement: precise dimensions are essential.
• Clear the sill area and provide unobstructed access to the window.
• Discuss fixing methods, sealing and flashing with the installer — it strongly affects thermal performance and ventilation.

Maintenance and routine care

• Lubricate hardware and check seals every 6–12 months.
• Clean glass with soft cloth and neutral detergent.
• Avoid abrasive cleaners on PVC profiles.
• If condensation appears, check ventilation settings and balance indoor humidity.

Common problems and remedies

• Drafts: inspect seals and adjust hardware.
• Condensation inside IGU: often caused by failed seal — IGU replacement is required.
• Difficult opening/closing: hardware adjustment and lubrication needed.

Warranty and service life

• Manufacturers commonly provide 5–10 years warranty on profiles and 2–5 years on hardware and IGUs. A well-installed IGU can last 15–25 years.
• To keep warranties valid, follow operating instructions and keep documentation (installation acceptance certificate).

How to choose a supplier

• Request certificates and profile system samples.
• Check reviews and installed project portfolio.
• Clarify measurement, installation, warranty and service terms.

Frequently asked questions (FAQ)

Q: Do I need to insulate the window sill during installation?

Yes. Proper insulation and sealing of the sill and reveals prevent thermal bridges and drafts. Installers use expanding foam, sealing tapes and insulation materials to ensure correct thermal performance.

Q: How often should I lubricate the hardware?

Lubricate moving parts and inspect adjustment screws at least once a year, and twice a year in coastal or high-humidity areas.

Q: Can PVC windows replace old wooden frames?

Yes. Replacement is common but requires professional removal of the old frame and careful preparation of the opening. In some cases replacing the entire window unit and reveals is recommended.

Q: What to do if mold appears on the reveals?

Mold points to excess humidity or poor ventilation. Improve ventilation, eliminate moisture sources and treat surfaces with appropriate cleaners and fungicides.

Q: How long does installation take?

A standard apartment window installation usually takes 2–4 hours. In complex situations it may take a full day. Expanding foam requires 7–14 days to fully cure.

Q: Which ventilation mode is best?

Use micro-ventilation for constant air exchange and tilt/open modes for intensive airing. Avoid leaving the window half-open in strong winds.

Q: Can an IGU be repaired without replacing the whole frame?

Yes. If the IGU seal fails, typically only the glass unit needs replacement while the frame remains intact.

Q: What documents should I request when buying?

Contract, work specification, handover certificate, warranty card and certificates for the profile and IGU.

If you need a measurement or consultation, contact DK-Logi — we will advise on profiles, IGUs and professional installation across Latvia.