A 10% waste allowance was applied to the board count.
Framing, board, and membrane quantities are calculated across the full wall length and height, ignoring openings — this calculator has no opening position, so it cannot tell which framing bay or membrane course an opening falls in. Net area (openings deducted) is shown for information only. This is the conservative choice: it does not risk under-ordering.
Board count assumes every framing bay is the nominal on-centre spacing wide. The last bay at the wall's far edge is only actually narrower when the wall length is not an exact multiple of the framing spacing — boards there are cut down on site, same as any bay narrower than the board's own width.
Thermal conductivity, fixing density, and fixing embedment depths are estimates you supplied above — they are not derived from a cited standard, since they depend on the specific insulation, fixing, and framing products used. Adjust them to match your chosen system.
This is the thermal resistance of the insulation layer alone: R = 2.86 m²·K/W. It does not include the substrate, membrane, air gap, cladding, surface resistances, or thermal bridging, so it is not the assembly U-value. Do not compare it directly against a national insulation requirement — compare the full assembly's U-value instead.
Standard: ISO 6946
The vertical framing (and cross-battens, where present) is itself a thermal bridge through the insulation layer — a further reason the layer R-value above is not the assembly's real thermal performance.
Cladding is out of scope for this calculator — cladding types differ too much to share one calculation. The cladding zone shown in the section diagram and included in the total build-up depth is an illustrative fixed allowance, not derived from a real cladding input.
The layer section diagram is schematic: only the framing/insulation cavity depth and the air gap depth are drawn to their real thickness. The substrate, membrane, and cladding zone layers are illustrative only.