Solid brick and stone walls need an insulation approach suited to their construction and exposure. Start with the existing building, then compare the internal and external routes.
Appearance and age can suggest a construction type, but they do not prove it. Render, later alterations and mixed construction can hide what is present. Ask a suitably experienced building professional to establish the wall build-up and condition.
Record rain exposure, pointing, gutters, roof details, existing finishes and any damp history. Repairs and moisture investigation should precede insulation. An insulation layer should not conceal a continuing leak.
Internal wall insulation can preserve an exterior appearance but affects room space, finishes and internal junctions. Plan the effect on floors, reveals, adjoining walls and services.
External wall insulation changes the outside and requires detailed design around openings, eaves, plinths and boundaries. The protective finish and insulation layer must work together.
Neither route suits every property. Exposure, heritage features, existing condition and moisture risk can change the choice. Compare the complete installed scope, not only the material price.
Traditional masonry can absorb, store and release moisture. Its behaviour depends on all layers, liquid-water exposure and drying conditions. A material described as breathable does not by itself prove that an insulated wall will remain dry.
Read our breathable-insulation guide. For older or protected buildings, use a professional experienced in traditional construction and confirm conservation constraints before altering surfaces.
Cork boards can be an insulation component in a coordinated design. Spray-applied and trowel-applied cork treatments have different thicknesses and roles. A thin treatment is not automatically a substitute for the insulation required to meet a project’s thermal objective.
Review ECOPROCORK system options, thickness-specific cork-board evidence and the thin-wall guide. Ask for product and build-up evidence appropriate to the particular wall.
Share the location, age, wall type if known, existing finishes, photographs and any moisture problem. Explain whether you need to preserve the facade or internal features and how much room space can change. Identify a measurable thermal objective with your design team.
Ask for a complete wall calculation, moisture assessment and junction details. General guidance does not establish compliance, an EPC uplift or bill savings. Discuss a cork specification or use professional project support.
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.