MAT.35/58

CategoryInsulation

ClassMineral Wool

Updated10/06/2026

Scala 1:1

Technical Sheet — A

A.01A.02

Material N°35

RockWool

Mineral insulation derived from the fusion of volcanic rocks. Offers a unique combination of thermal insulation, excellent acoustic absorption and passive fire protection (Class A1).

B.01

StratigraphySECTION A-A

Multi-function insulation principle. The fibrous mass blocks heat and dissipates acoustic energy through friction. Melting point above 1150 degrees C ensures passive fire compartmentation.

C.01

EU Standard

EN 13162

Isolanti Lana Minerale

C.02

Thermal conductivity

0.034 W/mK

Valore lambda D medio

C.03

Density

40 - 150 kg/m3

Variabile per uso

C.04

Fire class

A1 Euroclasse

Incombustibile

C.05

Permeability mu

Massima traspirabilita'

C.06

Safety

Biosolub.

Certificato EUCEB

Description

From the melting of basaltic rock a material is reborn that protects living spaces. Rock wool is not merely a thermal insulator, but a mineral barrier against fire and noise, a pillar of contemporary building safety.

01Production and mineral nature

Production emulates volcanic activity: natural rocks such as basalt, dolomite and diabase are melted in furnaces at over 1500 degrees C. The molten rock is spun to obtain very fine fibres, then moulded into rolls or panels. Being open-structured (mu=1), rock wool does not retain vapour, allowing walls to breathe and avoiding interstitial condensation.

02Fire resilience and acoustics

Unlike synthetic insulators (EPS, XPS, PU), rock wool is incombustible (Euroclass A1). It does not contribute to fire, does not drip and emits no toxic fumes, withstanding temperatures above 1000 degrees C. Acoustically, its fibrous nature acts as a sponge for sound waves, dissipating them within the mineral weave.

Technical identity

Standards

European and international references applicable.

EN 13162EUCEBRAL Quality MarkCAM Edilizia

Physical properties

Specific heat (Cp)1030 J/kgK

Melting point> 1150 gradi C

Water absorptionIdrorepellente (WS)

Tensile strengthFino a 15 kPa (TR)

Usage environment

Rock wool is mandatory on facades above certain heights where combustibility of external insulation is restricted. On breathable historic masonry, its mu=1 value prevents interstitial condensation.

A — 01

Documented applications

TAV. D

D.01

ETICS cladding system

Rigid high-density panels for ETICS cladding systems with fire protection requirements.

D.02

Roofs and flat roofs

High-load thermal insulation, ideal for timber or metal roofing systems.

D.03

Drywall partitions

Filling plasterboard stud cavities for superior acoustic and sound insulation performance.

D.04

Pipework and HVAC ducts

Insulation of pipework and air ducts subject to fire risk, maintaining structural integrity above 1000 degrees C.

Fire Behaviour (Euroclasse and Thermal Threshold)

TAV. E

Rock Wool (this material)The only insulation that does not burn, does not drip and does not emit toxic fumes at any temperature

A1 — Incombustibile: > 1150 gradi C

Glass WoolAlso mineral and non-combustible, but with lower melting point and lower mechanical strength for facades

A1/A2 — Incombustibile: > 700 gradi C

Wood Fibre Board (rigid panels)Slowly flammable: charring protective layer, no dripping, bio-based and carbon-storing

D/E — Lentamente infiammabile: > 300 gradi C

EPS Expanded Polystyrene (graphitic or standard)Flammable: shrinks and flows from 80 degrees C, burning spreads rapidly on facades

E — Infiammabile: > 80 gradi C

PU / PIR Polyurethane FoamCombustible: drips with flame and emits toxic HCN and CO gases when burning

E — Infiammabile: > 100 gradi C gocciola

While synthetic insulants excel in thinness (lower lambda), rock wool is the only material that guarantees total facade safety against vertical fire spread. Mandatory above certain building heights (RTV Facciate regulation).