NS 3700 Energy Standards & Steel Frame | Passive Steel Homes
A Norwegian technical standard for passive and low-energy residential buildings. Full criteria and the current edition need specialist confirmation.
NS 3700 in Steel Frame Construction
Key Questions for Project Evaluation
Who has access to the applicable standard and performs the assessment? What document will demonstrate the agreed result?
Applicable Countries & Adoption for NS 3700
European countries where this standard serves as a statutory code, subsidy benchmark, or accredited green label:
Performance Benchmarks & Criteria for NS 3700
Technical residential performance standard| Performance Parameter | Benchmark Target | Steel Envelope Methodology |
|---|---|---|
| Space Heating / Cooling Demand | ≤ 15 – 35 kWh/m²a | Continuous exterior mineral wool wrap + triple glazing |
| Airtightness (n50) | ≤ 0.60 – 1.00 h⁻¹ (50 Pa) | Variable vapor control membrane & continuous taping |
| Thermal Bridge Coefficient (Psi) | Ψ ≤ 0.010 W/mK | Continuous exterior insulation wrapping CFS frame completely |
| Mechanical Ventilation (MVHR) | ≥ 75% – 85% Recovery | Acoustically insulated MVHR system with F7 fine filtration |
| Summer Comfort / Overheating | ≤ 10% (> 25°C) | Exterior motorized solar blinds & architectural roof overhangs |
Delivery Packages Compatibility for NS 3700
Required procurement scope and on-site interfaces to secure compliance with this standard:
P1 Structural Frame
Supplies precision CFS steel frame and certified Eurocode statics dossier. Thermal insulation, airtight membranes, and high-performance fenestration must be procured and executed by your local site contractor.
P2 Frame + Cavity Insulation
Includes structural steel studs, cavity rockwool infill and exterior structural sheathing. Meeting the stringent benchmark U-values of this standard requires additional continuous exterior rockwool wrap on site.
P3 Weather-Tight Envelope
The SWEET SPOT for Passive House & statutory low-energy standards. Features continuous exterior insulation wrap (U <= 0.11-0.14 W/m²K), certified triple-glazed fenestration, and airtight junction details securing n50 <= 0.60 h⁻¹.
P4 Complete Turnkey Kit
Includes full P3 thermal envelope plus certified 85%+ MVHR ventilation unit, heat pump readiness, interior drywall lining assemblies, and sanitary/electrical rough-in components for 100% turnkey compliance.
International Green Building Finance & ESG Capital
Cold-formed steel homes certified to this performance benchmark qualify for European green mortgage products and command a 15-25% premium in market liquidity and asset preservation.
Certification & Verification Roadmap for NS 3700
PHPP or statutory calculation prepared with plot coordinates, solar azimuth, and local weather files.
Target U-values specified with exterior rockwool thickness and triple-glazed warm-edge fenestration.
ISO 9972 pressure test and IR thermography physically verify airtightness threshold n50 <= 0.60 h⁻¹.
Third-party certified audit dossier submitted for official energy efficiency and green mortgage registration.
Why Cold-Formed Steel for NS 3700?
Steel frame does not shrink, twist or warp, ensuring airtight seals and tape junctions remain permanently intact.
Windows and panel interfaces are roll-formed to 0.5 mm tolerance, preventing unplanned thermal leaks on site.
Galvanized steel is impervious to rot, mold, fungi and termites, securing building biology credentials.
Building Physics & Technologies for Standard Compliance
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Frequently Asked Questions
Essential answers regarding steel construction, energy targets and project delivery.
Yes. With exterior continuous insulation eliminating thermal bridging, certified triple-glazed windows, airtight membranes, and heat recovery ventilation (MVHR), steel homes achieve full Passive House standards.
Thermal bridging is prevented by external continuous insulation wrap, thermal-break tape on structural connections, and decoupling outer claddings from interior framing.
Passive House requires n50 <= 0.6 h-1 on Blower Door testing. Our envelope design incorporates continuous vapor control membranes taped at all seams.
Minergie is a Swiss quality label focusing on energy efficiency and indoor comfort with specific primary energy criteria, while Passivhaus has strict heating demand caps (15 kWh/m²a).
Official building certifications are issued by accredited third-party certifiers (e.g. Passive House Institute, Minergie Agency, DGNB) upon submission of calculations and test results.
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