Lime and lime mortars: what to choose and why

Our picks

• 
  For traditional lime

  GORDILLOS CAL DE MORÓN S.L.U

  Its own declaration valid to 2031, read from the official register: 0.329 kg CO₂e per kilo of aerial lime mortar, roughly 564 per cubic metre at the yield it declares. Lime emits when it is burned and takes CO₂ back up as it sets; having the figure published is what lets you argue that balance with data.

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• 
  For hydraulic lime mortar

  Saint Astier

  Its own French declaration in the INIES register, from 2024: 1.89 kg CO₂e per square metre of 10 mm render with NHL 3.5 lime. We don't know its expiry date.

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Compare the data

Only materials with some published data are listed, ordered by footprint within each unit. Two footprints declared in different units are not comparable with each other, and neither are two versions of the standard: EN 15804 «+A2» and «+A1» count biogenic carbon differently, and «ISO 21930» is another accounting altogether. «Yes · document» means we hold the declaration and the figures come from it; «Declared» means the manufacturer says it has an EPD but we don't hold the document, and its figures come from the entry. A dash means the manufacturer doesn't publish it, not that the material lacks it.