Systems 01 to 44 follow the list in Modern Construction Envelopes by Andrew Watts. The build-ups are generic examples to edit.
Walls, roofs and curtain walls, for example a National BIM Library object or a Revit export. The file is read on this device and is not uploaded.
Centre and frame figures are typical values to replace with the supplier's. For the glass edge, about 0.05 suits a warm-edge spacer and 0.08 to 0.11 an aluminium one. Set the edge length to 0 for blocks, sheets, cushions and fabric.
0.04 suits open-jointed boards with nothing over them. A water control layer cuts it sharply, so use the figure from the product's certificate.
House areas are rough typical UK figures with windows and doors taken out: walls about 45, 80 and 135 m²; roof or ground floor about 40, 48 and 70 m²; windows about 12, 20 and 30 m². Car: 0.17 kgCO₂e per km for an average UK car. Flights: per economy passenger, including the extra warming from emissions at altitude. Factors from the UK government's 2025 greenhouse gas conversion factors.
A concept-stage overview of the whole build-up. It uses the Project details at the top, rates each area, names what governs the design and lists the main risks, each linked to the page it comes from.
Red and amber ratings come from the regulations and standards linked under each item. Three are the tool's own rules of thumb: under 10% U-value headroom is amber, condensation that dries out is amber (red at a timber or wool layer or over 200 g/m²), and under 10 g/m² counts as a trace.
| # | Material | Reaction to fire | Notes |
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Classes are typical values for generic products to BS EN 13501-1, from A1 (non-combustible) to F. Use the manufacturer's declaration of performance and the building's fire strategy for the real thing.
Each step of the calculation with the current numbers filled in, then what it assumes.
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