“Breathable” is a useful starting question, but it is not a complete insulation specification. Ask how the whole wall handles water vapour, liquid water and drying.
Water vapour can move through materials by diffusion. Liquid water from rain, leaks and other sources behaves differently. Moisture storage, capillary movement, air leakage, ventilation and drying conditions also affect a construction.
A vapour-permeable finish does not automatically make an underlying wall moisture-safe. It does not replace ventilation, repair a leak or guarantee prevention of condensation or mould.
Assess the existing wall, paints, renders, adhesives, insulation and proposed finish together. An incompatible layer can change drying even when another layer is described as breathable. Include external exposure and internal moisture conditions in the assessment.
For traditional masonry, consult someone experienced in the building type. Read the solid-wall guide and compare internal and external insulation approaches before selecting components.
Sprayed cork, trowel-applied cork, lime-and-cork mortar and cork boards are different products. Do not transfer a vapour-resistance or thermal result from one product to another. Request the exact product, installed thickness, test method and limitations.
Use the ECOPROCORK technical document library and system guide. Product data supports design decisions; it does not establish whole-wall moisture performance or certify every combination of components.
If the wall is cold or mould returns, assess moisture sources, heating, ventilation, thermal bridges and building defects. The appropriate work may include repairs or ventilation changes alongside a suitable insulation design.
Start with the cold-wall assessment guide. A thin coating should not be described as a universal damp treatment or as equivalent to thicker insulation.
Request professional specification support or send your project details to discuss relevant cork components.
General planning guidance reviewed 16 October 2026. See Energy Saving Trust: solid-wall insulation and Historic England: energy efficiency and retrofit. These independent sources explain general principles; they do not approve an ECOPROCORK system.