Calculates the number of siding panels needed for a facade.
The siding calculator works out how many panels you need to clad a façade. A standard panel is 3.66 m long with an effective width of 0.2 m.
Panels = ⌈wall area × (1 + waste%) / (panel length × panel width)⌉
120 m² of façade, 10% waste, 3.66 × 0.2 m panels (0.732 m²). Panels: ⌈120 × 1.1 / 0.732⌉ = ⌈180.3⌉ = 181.
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