Exterior shade cloth (voile d'ombrage) cut and hemmed to size, hung on hooks over windows/skylights/glazed doors, removable, reusable, far cheaper and structurally simpler than a mounted brise-soleil: sewing skill only, no structural fixing. Field-tested by its author over a full summer with a clearly noted result.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
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No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.