Which windows are best for the old Lithuanian project

Which windows are best for the old Lithuanian project

Old residential projects in Lithuania — typical panel or brick apartment blocks built in the Soviet and post-war periods — have their own challenges when replacing windows. Choosing the right profile, glazing unit, and installation method reduces heat loss, improves sound insulation, and prevents condensation issues.

What to assess first

• Wall type: panel, brick, or masonry — determines mounting depth and type of anchors.
• Opening dimensions and geometry: often non-standard, so precise in-situ measuring is essential.
• Exposure and climate: north-facing or corner windows need better insulation.
• Condition of slopes and sills: may require repair or reinforcement before installation.

Recommended technical solutions

Profile

• 5-chamber PVC profile — best balance of cost and thermal performance for most cases.
• 6-chamber or reinforced profiles — recommended if planning heavy triple glazing or for higher thermal demands.
• Steel reinforcement must be sized and positioned according to sash size and wind loads.

Insulating glass unit (IGU)

• Double IGU with argon fill and warm-edge spacer — economical and effective.
• Triple IGU (e.g., 4-16-4-16-4) — recommended for colder exposures or very drafty buildings.
• For noisy streets use laminated or acoustic outer glass and larger cavity widths.

Hardware and ventilation

• Micro-ventilation and secure multipoint hardware are important for damp old buildings.
• Install a trickle vent or provide mechanical ventilation if windows become highly airtight.

Installation

• Warm installation with vapor and waterproofing tapes plus proper foam sealing reduces thermal bridges.
• Anchor into the structural part of the wall or use mounting profiles; do not rely on old plaster.
• Account for scaffolding and sill adjustments when working on facades.

Practical selection tips

• For best energy performance: 6-chamber profile + triple IGU with warm spacer and argon.
• For noise reduction: laminated outer pane combined with increased cavity width.
• For heritage look: PVC with woodgrain foil or slim-profile aluminium cladding.
• For budget replacement: 5-chamber profile + argon-filled double IGU.

Maintenance and longevity

• Inspect seals yearly and lubricate hardware.
• Maintain adequate ventilation — airtight windows without ventilation often cause condensation and mold.
• If condensation appears, first check ventilation and indoor humidity before blaming the window.

FAQ (common questions)

Do I need permission to replace windows?

Usually no permit is required for interior replacement unless you alter the facade, change the opening size, or the building is protected as a heritage monument — then approval is needed.

How long does manufacture and installation take?

Typical lead time: 2–4 weeks for standard units. Custom sizes, laminations, or special glazing increase lead time to 4–8 weeks.

How to avoid thermal bridges at the installation site?

Use warm installation with vapor and waterproofing tapes, proper foam sealing, and place the mounting plane to minimize exposure.

What guarantees should I expect?

At least 5 years for profiles and hardware, 2–5 years for glass units. Installation warranty should be separate (minimum 2 years recommended).

Conclusion — quick recommendations

• Use professional measurement and warm installation.
• 5–6-chamber profiles with argon-filled IGUs suit most old Lithuanian apartments.
• For urban noise, choose laminated glass with larger gaps.
• Preserve ventilation — it is cheaper to ventilate than to eliminate mold.

Summary (key points)

• Evaluate wall type and opening depth before ordering.
• 5–6 chamber PVC profiles are generally optimal.
• Triple IGUs improve thermal insulation; double IGUs are cost-effective.
• Warm installation reduces cold bridges.
• Provide trickle vents or mechanical ventilation with airtight windows.
• Wood-effect foils or aluminium cladding preserve façade look.
• Laminated glass and large cavities work best against noise.
• Check installer reputation and warranty terms.