Engineering Fundamentals & Design Principles
Achieving high thermal performance in steel building systems requires rigorous mitigation of thermal bridging. SerBuild designs continuous exterior insulation systems (ETICS/EIFS) paired with high-density mineral wool or polyisocyanurate (PIR) cores and closed-cell EPDM thermal isolator tapes (thermal conductivity lambda < 0.035 W/mK) at all steel-to-cladding interfaces.
Where R_si and R_se are interior/exterior surface thermal resistances, \lambda is thermal conductivity, and \Psi is linear thermal bridge transmittance.
Applicable Design Standards & Codes
- Thermal U-values from 0.22 down to 0.11 W/m²K meeting German GEG, French RE2020, and EU EPBD targets
- Continuous exterior insulation (ETICS/EIFS) eliminating cold bridging across steel frame studs
- Thermal break isolator tapes (thermal conductivity lambda < 0.035 W/mK) on all exterior interfaces
- Airtight building envelope engineering certified for blower-door pressure testing (n50 < 0.60 h-1)
Engineering Deliverables Provided
- Thermal transmittance (U-value) calculation dossiers per EN ISO 6946 and EN ISO 10211
- Condensation risk and interstitial moisture analysis (Glaser method) per EN ISO 13788
- Airtightness sealing detail drawings and tape installation protocols
Thermal Performance & Insulation Assembly Matrix
Summary of governing standards, compliance thresholds, and engineering significance:
| Parameter / Check | Governing Standard | Specification / Value | Significance |
|---|---|---|---|
| Exterior Wall U-Value | EN ISO 6946 / German GEG | U = 0.11 – 0.18 W/m²K | Complies with KfW 40 / Passivhaus low-energy standard. |
| Roof Envelope U-Value | EN ISO 6946 | U = 0.10 – 0.15 W/m²K | Minimizes winter heating loss and summer solar heat gain. |
| Interstitial Condensation | EN ISO 13788 (Glaser Method) | Zero interstitial condensation risk | Prevents internal moisture accumulation, mold growth, and structural corrosion. |
| Airtightness Rating | EN ISO 9972 | n50 \le 0.60 h^{-1} | Passes statutory blower-door pressure tests with integrated smart vapor barriers. |
4-Stage Factory Quality Assurance Pipeline
Strict quality control gates from 3D BIM model validation to containerized dispatch:
Calculating Psi (\Psi) values at wall-to-floor and window perimeter junctions.
Simulating vapor pressure saturation profiles across monthly winter cycles.
Applying continuous closed-cell thermal break tapes to steel exterior faces.
Sealing membranes with certified butyl tapes and airtight grommets.
Request Sample Eurocode Dossier & 3D BIM Model
Receive complete structural calculation dossiers, FEA connection verifications, and sample IFC 3D models for municipal building permit evaluation.
Frequently Asked Technical & Engineering Questions
Direct answers from our senior structural engineering department:
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