Which profiles are best to choose for series 104

Which profiles are best to choose for series 104

Apartments in the 104 series have specific constraints: narrow window openings, limited reveal depth and pronounced thermal bridges. Choosing the right PVC profile and glazing significantly improves thermal comfort, noise reduction and long-term performance.

Key considerations for series 104

• Opening dimensions and installation depth — often limited, so a profile with compact outer dimensions but sufficient installation depth is necessary.
• Frame heat loss — older panel buildings lose heat through the frame; more chambers and good seals help.
• Exterior finishing and sill projection — plan together with your installer.

Selection criteria

• Installation depth (58–82 mm). For 104 series a 60–70 mm depth is usually optimal: compact yet thermally efficient.
• Number of chambers: 3–5 chambers are basic, 5–6 are optimal for Latvian climate, 7–8 provide extra insulation but require larger dimensions.
• Reinforcement capability: essential for larger sashes.
• Quality and number of seals (double/triple).
• Compatibility with triple glazing if needed.

Profile types and recommendations

• 58–60 mm, 3 chambers

  • Pros: compact, cost-effective, easier to fit in tight openings.
  • Cons: lower thermal and acoustic insulation; may not support thick triple glazing.
  • Recommended when space is extremely limited or on a tight budget.

• 70 mm, 5–6 chambers (recommended)

  • Pros: best balance of thermal performance and frame size; supports double and triple glazing; more room for reinforcement.
  • Cons: slightly wider frame — check reveal depth.
  • Recommended for most 104-series apartments.

• 82 mm, 7–8 chambers

  • Pros: superior thermal and acoustic insulation, excellent energy savings.
  • Cons: large external dimensions; may not fit existing reveals without renovation.
  • Recommended if planning full reveal renovation or deeper installation.

Glazing options

• Double glazing (two panes) — standard improvement for energy efficiency.
• Triple glazing — recommended in cold climates or where wall heat loss is significant.
• Gas fills (argon, krypton) and Low-E coatings reduce U-values.

Reinforcement, hardware and seals

• Steel reinforcement inside the profile is necessary for larger sashes.
• Durable hardware with adjustment features ensures longevity and proper compression.
• Two or three sealing contours significantly improve airtightness.

Installation notes for 104 series

• Check reveal depth and sill projection; sometimes reveal trimming is needed.
• Proper installation with sealing layers (foam, vapor and waterproof membranes) is crucial.
• When windows are very airtight, add ventilation — trickle vents or mechanical supply/exhaust.

FAQ — Practical questions

Is triple glazing necessary in 104 series apartments?

Triple glazing improves thermal performance but requires a profile with sufficient depth (70 mm+). If you’re upgrading reveals and sill, triple glazing is worth the investment.

What if the opening is too narrow?

Choose a 58–60 mm profile (3–5 chambers). Bear in mind the trade-off in insulation; if possible, prefer 70 mm.

Should I add extra sealing or warm external reveals?

Yes. Insulating the junction between frame and wall (internal vapor barrier, external waterproofing, foam filling) preserves window performance.

Which hardware is preferable?

Hardware with corrosion-resistant treatments and adjustable compression points; reinforced hardware for heavy sashes.

Will a new profile reduce street noise?

Yes. A profile with more chambers combined with a well-matched glazing unit (different glass thicknesses) reduces noise significantly.

How much does an optimal solution cost?

Cost depends on profile depth, glazing type and installation complexity. A 70 mm profile with double or triple glazing is usually the most cost-effective approach.

Maintenance tips

Regularly inspect seals, lubricate moving parts and clear drainage channels to maintain performance.

Conclusion

For series 104 apartments the best compromise is a 70 mm profile with 5–6 chambers, proper reinforcement, good seals and a suitable glazing unit. Combined with professional installation and correct sealing of junctions, this delivers substantial improvements in warmth and comfort.