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Reference ToolIndicative tool · BS EN ISO 6946 / BR443 combined-method U-value calculation
Panel Explorer
Build a timber-frame wall layer-by-layer. Pick cladding, insulation, stud depth, sheathing and service void; the live U-value, decrement delay and a scaled horizontal section update with each change. Use it for early-stage build-up exploration.
Panel Explorer · live U-value
U-value
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W/m²K · BR443 combined method
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0.100.200.300.40+
Horizontal section
Outside → inside
Wall build-up
Outside → inside
Drag to orbit
Indicative tool · combined-method calculation per BS EN ISO 6946 / BR443. Results are for early-stage design comparison only and must not be used in lieu of an accredited U-value calculation. λ-values, R-values and product properties shown are illustrative manufacturer-declared figures; verify against current technical datasheets before specification. Knight Designs Ltd accepts no liability for outcomes derived from use of this tool.