Complete nZEB System: Salamander bluEvolution 92 + Blaugelb Triotherm+ Preframes + Triple Glazing — Full Technical Guide 2026

What is the nZEB Standard and Why Does It Matter for Your Windows

nZEB — Nearly Zero Energy Building — is not an optional certification. It is the mandatory standard for all new constructions in Romania since 2021, under Directive 2010/31/EU on the energy performance of buildings (EPBD). A nZEB building must achieve primary energy consumption ≤ 100 kWh/m²/year. Windows contribute directly to this balance — they represent 15-25% of a dwelling's envelope area and account for 25-35% of heat losses in conventional construction.

A nZEB window system is not just a good profile. It is an integrated system where each component is selected and installed to minimise thermal losses at the window opening — from the profile itself, to the glazing unit, to the spacer inside the glass pack and the perimeter seal against the masonry.

Component 1 — Salamander bluEvolution 92 Profile

Profile geometry:

• 6 air chambers, 92 mm construction depth, 3.0 mm outer walls (Class A per EN 12608), 3 EPDM gaskets

Thermal performance:

• Profile thermal transmittance: Uf = 0.95 W/(m²K) (IFT Rosenheim certified)
• Air permeability: Class 4 (EN 12207) — maximum
• Chemical composition: exclusively Ca-Zn stabilisers since 2008 — no lead, no cadmium, REACH compliant

Component 2 — Saint-Gobain SGG Triple Glazing

Pack structure: 4 mm / 16 mm Argon / 4 mm Low-E / 16 mm Argon / 4 mm — total 44 mm

Technical parameters:

• Ug = 0.5 W/(m²K) with argon 90% concentration
• Solar factor g = 0.34 (Low-E on position 2)
• Light transmittance TL = 70%
• Acoustic attenuation Rw = 34-36 dB

Warm Edge spacer: Standard aluminium spacer has λ = 160 W/mK — creates visible condensation stripe at inner glass edge. Warm Edge spacer (TGI, Swisspacer, Thermix) has λ = 0.15-0.2 W/mK — reduces marginal thermal bridge by 75-85%.

Uw calculation for complete window (100×120 cm):

• Uf = 0.95, Ug = 0.5, Ψg Warm Edge = 0.030 W/mK
• Uw resultant = 0.72 W/(m²K) — 49% reduction in heat loss vs standard double glazing (Uw = 1.4)

Component 3 — Blaugelb Triotherm+ Preframes

The preframe is mounted before the window itself, in the thermal insulation plane of the wall. Its composite material has thermal conductivity λ = 0.035 W/mK — comparable to mineral wool. The window is subsequently mounted on the preframe, which:

• Thermally insulates the frame-masonry contact
• Allows window mounting in the thermal insulation plane (Passive House requirement)
• Reduces perimeter linear thermal bridge ψ from 0.08 W/mK (no preframe) to 0.01 W/mK (with preframe)
• PassivHaus Institut (PHI) certified

Component 4 — Perimeter Sealing (Pre-Compressed Band)

Three-zone RAL installation:

• Exterior: Pre-compressed butyl band (Illbruck TP600) — waterproof ≥ 600 Pa, UV-resistant, 20-25 year durability
• Middle: Semi-open cell polyurethane foam — thermal and acoustic insulation
• Interior: Vapour barrier film — prevents condensation and mould in wall structure

Economic Calculation

Indicative nZEB system cost (100×120 cm window, installation included):

• Salamander bluEvolution 92 profile + triple glazing: €220-280
• Blaugelb Triotherm+ preframe: €50-70/unit
• Professional nZEB installation: €60-90
• Total 100×120 cm nZEB window: €330-440

Annual energy saving (80 m² apartment, 10 windows):

• Standard windows: ~2,800 kWh/year heat loss
• Complete nZEB windows: ~980 kWh/year heat loss
• Saving: −1,820 kWh/year → €110-140/year at current energy prices
• Payback period on additional investment: 10-13 years

Neofort BIZ installs complete nZEB systems in Bucharest and Ilfov — Salamander bluEvolution 92, Blaugelb Triotherm+ preframes, Saint-Gobain triple glazing, Illbruck pre-compressed bands. Request technical quote.