Rock Wool Insulation

Close-up of rock wool insulation slab material

QUICK PRODUCT SUMMARY

Rock Wool Insulation at a Glance

Rock wool is produced by melting basalt and other volcanic rock at high temperature and spinning the melt into fine mineral fibres, which are then bonded into slabs, rolls and mattresses. Its fibrous, non-combustible structure makes it a common choice wherever thermal insulation, fire protection and sound control all matter together.

Construction

Bonded mineral fibre from molten basalt rock

Options

Plain, foil-faced and wire-mesh reinforced

Applications

Industrial, HVAC and acoustic use

Available configurations: Rock Wool Slabs • Rock Wool Rolls / Mattresses • Wire-Mesh Reinforced Mattresses • Preformed Pipe Sections

PERFORMANCE ADVANTAGES

Why Rock Wool Insulation Is Specified

Rock wool is selected for projects that need a combination of thermal performance, fire safety and acoustic control together. Its suitability always depends on the selected density, thickness, facing and complete installation assembly.

Fire Resistance

Made from non-combustible mineral fibre, rock wool is widely used in fire-rated assemblies and high-temperature industrial applications.

Thermal Insulation

The fibrous structure traps still air, helping reduce conductive heat transfer through pipes, ducts, equipment and building surfaces.

Acoustic Absorption

The random fibre orientation helps absorb airborne sound, supporting noise control in partitions, plant rooms and enclosures.

Dimensional Stability

Rock wool holds its shape and thickness under normal service conditions, supporting consistent long-term insulation performance.

Density and Thickness Range

Available across a range of densities and thicknesses, allowing selection according to the thermal, acoustic and load requirement of the project.

Facing and Reinforcement Options

Plain, aluminium foil-faced and wire-mesh reinforced constructions allow the product to be adapted to different installation needs.

APPLICATION AREAS

Where Rock Wool Insulation Performs Best

Rock wool is used across industrial, building and acoustic systems where heat, fire risk and sound all need to be managed within the same insulation layer.

Industrial

Boilers, Vessels and Furnaces

High-temperature resistant rock wool is used to insulate boilers, furnaces and process vessels where sustained heat exposure needs to be managed.

Rock wool pipe section insulation on industrial piping

Mechanical

Pipes and HVAC Ducts

Preformed pipe sections and rolls help reduce heat loss or heat gain and support condensation control on pipework and ductwork.

Rock wool insulation installed in a PEB roof and wall

Roofing

PEB Roofs and Walls

Installed within metal roof and wall assemblies to help manage heat transfer while contributing to the fire performance of the structure.

Acoustic

Partitions and Plant Rooms

Used inside partition walls, ceilings and plant enclosures where sound absorption is needed alongside thermal and fire performance.

PRODUCT CONFIGURATIONS

Choose the Right Rock Wool Configuration

The form, facing and reinforcement should be selected according to the surface geometry, temperature, mechanical exposure and installation method.

Rock Wool Slabs

Rigid boards used on flat or slightly curved surfaces, walls and equipment casings where a self-supporting insulation layer is required.

Rock Wool Rolls and Mattresses

Flexible rolls used across ducts, curved surfaces and large-area applications that need a conformable insulation layer.

Wire-Mesh Reinforced Mattresses

Rock wool bonded to a wire mesh facing for applications on vessels, ducts and equipment that need additional mechanical support.

Preformed Pipe Sections

Pre-cut cylindrical sections that fit directly around pipework for faster and more consistent pipe insulation.

Note: facing and reinforcement are not automatically interchangeable — product selection should always consider the complete installation assembly.

SURFACE PROTECTION

Why Facing and Reinforcement Matter

Rock wool provides the core thermal and acoustic performance, while facing and reinforcement layers protect the fibre, support handling and adapt the product to the installation method. Choosing the right combination depends on the surface, exposure and mechanical demands of the application.

The rock wool core provides thermal and acoustic insulation.
Aluminium foil facing adds a vapour barrier and a reflective surface.
Wire mesh adds mechanical strength for vertical or curved surfaces.
Facing choice affects handling, durability and installation speed.

Technical note: Fire classification, thermal conductivity and service-temperature figures should only be quoted when the exact claim, test method and product grade are supported by a valid test report. Please request the current technical datasheet for figures applicable to your project.

PRODUCT SELECTION

How to Select the Right Density and Thickness

The correct density and thickness cannot be chosen from a general chart alone. It should be based on the operating temperature, surface type, acoustic target and installation conditions.

Factors That Influence Selection

Operating or service temperature
Surface type — flat, curved or cylindrical
Required thermal performance
Acoustic requirement, if applicable
Exposure to moisture or weather
Available installation space
Facing and reinforcement requirement
Fire and compliance requirements

Information We Need for a Recommendation

Application type — equipment, roof, duct or wall
Surface dimensions and shape
Approximate project area
New or existing installation
Current heat, fire or noise issue
Preferred density or thickness, if known
Facing requirement
City and project location

PRODUCT COMPARISON

Rock Wool vs Glass Wool vs Ceramic Fibre

Each mineral insulation type performs differently at high temperature. The right choice depends on the operating temperature, surface, fire requirement and budget of the project.

Factor	Rock Wool	Glass Wool	Ceramic Fibre
Core construction	Fibres spun from molten basalt rock	Fibres made from molten glass	Fibres made from refractory ceramic materials
Primary performance	Thermal, fire and acoustic performance	Thermal and acoustic performance	Very high-temperature thermal resistance
Typical temperature range	Higher-temperature industrial use	Lower to moderate temperature use	Very high-temperature and refractory use
Weight and handling	Denser than glass wool	Generally lighter and softer to handle	Lightweight but requires careful handling
Best suited for	Industrial equipment, PEB roofs, acoustic walls	HVAC, ceilings and general building insulation	Furnace linings and very high-temperature equipment
Selection basis	Temperature, fire rating and acoustic need	Thermal performance and installation ease	Maximum service temperature requirement

No single insulation product is universally best for every application. Selection should be based on the complete system rather than density or price alone.

MANUFACTURING AND QUALITY

Manufactured for Industrial Project Requirements

Fibre quality, density control, facing and dimensional consistency all influence how rock wool insulation performs and installs on site.

Raw Material Selection

Basalt and other raw materials are selected to produce consistent fibre quality for the intended density and grade.

Density and Dimensional Control

Thickness, density and board or roll dimensions are controlled for predictable performance and easier installation.

Facing and Bonding Quality

Foil facing or wire-mesh reinforcement is properly bonded to support handling, durability and installation.

Inspection and Dispatch

Product inspection, packaging and dispatch controls help reduce installation issues at the project site.

TECHNICAL INFORMATION

Rock Wool Insulation Specifications

The exact specification varies by density, thickness, facing and form. Refer to the current technical datasheet for final project selection.

Material	Mineral fibre spun from molten basalt rock
Product form	Slabs, rolls, mattresses and pipe sections
Facing options	Plain, aluminium foil-faced and wire-mesh reinforced
Density	Multiple options — refer to current product datasheet
Thickness	Multiple options — refer to current product datasheet
Thermal conductivity	Refer to tested value for the selected grade
Service temperature	Refer to current technical datasheet
Fire performance	Only as certified for the selected product grade
Water absorption	Refer to current technical datasheet
Board or roll size	Available according to product configuration
Colour	Product-grade dependent
Typical applications	Industrial equipment, PEB roofs, ducts and acoustic walls
Installation method	Application and assembly-dependent

DOCUMENTATION

Technical Data, Test Reports and Product Documentation

Consultants, architects, contractors and procurement teams may need product-specific documentation before approval or installation.

Technical Datasheet

Review current product construction, available variants and technical properties.

Thermal Performance

Request applicable thermal-conductivity or insulation-performance documentation for the selected grade.

Fire Performance

Fire classification must be verified for the exact product grade and test standard required by your project.

Project Submittal Support

Get the technical documents required for consultant, architect, contractor or procurement review.

INSTALLATION

Rock Wool Insulation Installation Overview

The final installation method depends on the surface, equipment, facing and project design. The steps below are a general overview only.

01

Inspect the surface

Inspect and clean the surface or equipment before starting work.

02

Confirm density and facing

Confirm the selected density, thickness and facing for the assembly.

03

Measure and cut

Measure and cut the slabs, rolls or pipe sections accurately.

04

Fit around the surface

Fit the insulation snugly around pipes, ducts or equipment surfaces.

05

Secure with fixings

Secure the insulation using pins, bands or wire as suited to the surface.

06

Seal joints and seams

Seal joints and seams with suitable tape or facing where required.

07

Avoid compression

Avoid unnecessary compression of the insulation during fixing.

08

Protect exposed edges

Protect exposed edges and facing from physical damage on site.

09

Follow project specs

Follow applicable fire, building and project requirements throughout.

Technical note: installation drawings and project specifications should always take precedence over this general overview.

AVOID THESE ISSUES

Common Rock Wool Selection and Installation Mistakes

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Selecting on price alone

Choosing density and thickness only on the basis of price rather than performance.

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Ignoring service temperature

Selecting a grade without checking it against the actual operating temperature.

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Compressing the insulation

Over-compressing rock wool during fixing, which reduces its insulating air gaps.

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Untreated joints and seams

Leaving joints, seams and penetrations untreated after installation.

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Exposing insulation to moisture

Leaving unprotected rock wool exposed to prolonged moisture or weather.

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Handling without protection

Handling mineral fibre insulation without the recommended protective equipment.

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Using unverified claims

Relying on unverified fire or thermal performance claims.

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Mismatching facing to application

Using a facing or reinforcement not suited to the surface or exposure.

FREQUENTLY ASKED QUESTIONS

Questions About Rock Wool Insulation

What is rock wool insulation?

Rock wool is a mineral fibre insulation made by melting volcanic rock, primarily basalt, and spinning it into fibres that are bonded into slabs, rolls and pipe sections for thermal, fire and acoustic applications.

Is rock wool fireproof?

Rock wool is made from non-combustible mineral fibre, but exact fire classification depends on the product grade and applicable test standard — always verify the required report before approval.

What is the difference between rock wool and glass wool?

Rock wool is made from molten basalt rock, while glass wool is made from molten glass. Rock wool is generally denser and used at higher service temperatures, while glass wool is lighter and common in general building insulation.

Can rock wool be used on hot pipes and boilers?

Yes. Rock wool is commonly used on pipes, boilers and process equipment operating at elevated temperatures, subject to the correct grade and thickness being selected for the application.

Which density should I select?

Density should be selected after evaluating the operating temperature, surface type, acoustic requirement, mechanical exposure and applicable project specifications.

Is rock wool good for soundproofing?

Rock wool's fibrous structure gives it useful sound-absorbing properties, and it is commonly used in partitions, ceilings and plant enclosures where acoustic control is needed.

Does rock wool absorb moisture?

Rock wool can absorb moisture if left unprotected, so a suitable facing or vapour barrier is generally recommended in exposed or humid conditions. Refer to the technical datasheet for the selected grade.

What facing options are available?

Common options include plain rock wool, aluminium foil-faced rock wool for vapour control, and wire-mesh reinforced rock wool for added mechanical strength on vertical or curved surfaces.

Is protective equipment needed to handle rock wool?

Standard protective equipment such as gloves, eye protection and a dust mask is generally recommended when cutting or installing mineral fibre insulation.

Can rock wool be used in residential buildings?

Rock wool can be used in residential and commercial construction for thermal and acoustic insulation, in addition to its common use across industrial applications.