Mineral-wool ETICS

The mineral version of the external insulation system: rock-wool boards bonded and anchored to the wall, base-coated with mesh and finished with render. Compared with EPS, rock wool is non-combustible (Euroclass A1/A2) and vapour-open: the system «breathes» and resists fire, which is why it is the typical choice for tall buildings and fire compartments, where the façade's reaction to fire is decisive.

Mineral-wool ETICS is an external insulation system in which the synthetic insulant is replaced by mineral rock-fibre boards. The logic is the same as the classic system — bonding, anchoring, mesh-reinforced base coat, finish — but two key properties of the material change: the reaction to fire and the vapour permeability.

Rock wool is a mineral: it does not burn and does not spread flame (Euroclass A1/A2). On a tall building this is decisive, because a combustible façade can turn a single-floor fire into a fire of the whole envelope. This is why mineral systems, or mineral fire-barrier bands, are required or recommended above certain heights and in fire-regulated activities.

Unlike EPS, rock wool lets vapour through: the system is «breathable». Moisture migrating from inside to outside is not trapped but dries out, reducing the risk of interstitial condensation and favouring healthier walls, especially on historic buildings and massive masonry that need to release moisture.

Rock wool is denser and heavier than EPS: it improves the façade's acoustic insulation and adds inertia, but it needs anchors and adhesives suited to the weight and careful laying that does not compress the board. Reinforced base coat, finish and accessories (corner beads, drips, starter profiles) follow the same rules as the classic system; the finish must stay vapour-open (silicate or siloxane renders and paints) so the advantage is not lost.