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What are the characteristics of thermal insulation mortar? - NFLG Dry Mortar Plant Supplier

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What are the characteristics of thermal insulation mortar?

July 12, 2023 jinchen 0 Comments

In the realm of sustainable construction practices, thermal insulation plays a pivotal role in optimizing energy efficiency and enhancing occupant comfort. One effective solution in this domain is thermal insulation mortar. This specialized mortar is designed to provide thermal insulation properties to building envelopes, reducing heat transfer and preventing thermal bridging. In this comprehensive guide, we will delve into the world of thermal insulation mortar, exploring its types, applications, advantages, installation techniques, and environmental impact.

Understanding Thermal Insulation Mortar

a photo of Thermal insulation mortar

Thermal insulation mortar is a specialized mortar used for thermal insulation purposes in construction. Its primary function is to reduce heat transfer through building envelopes, ensuring improved energy efficiency and comfort within the structure. Key points to consider include:

Thermal insulation mortar acts as a barrier, minimizing heat loss or gain, and preventing thermal bridging.

It is typically applied to external walls, internal walls, roofs, floors, and other areas requiring thermal insulation.

Types of Insulation Mortar

a photo of Thermal insulation mortar

Insulation mortar is specifically designed to provide thermal insulation in construction applications. They offer improved thermal resistance and reduce heat transfer through walls, floors, and other building elements. Here are some common types of insulation mortar, along with their properties, compositions, and applications:

Lightweight Insulating Mortar

Properties: Lightweight insulation mortars have low density and high porosity, which contribute to their thermal insulation properties.

Composition: They are typically composed of lightweight aggregates, such as expanded perlite, expanded vermiculite, or polystyrene beads, mixed with a binder, such as cement or lime.

Applications: Lightweight insulation mortar is used in wall insulation, cavity fillings, and as a base for thermal insulation systems.

Vermiculite Insulating Mortar

Properties: Vermiculite insulation mortar has excellent thermal insulation properties, as well as good fire resistance and sound absorption.

Composition: They consist of vermiculite, a naturally occurring mineral that expands when heated, mixed with a binder like cement or lime.

Applications: Vermiculite insulation mortar is used in various applications, including fireplace insulation, chimney linings, and as an insulating layer under floors.

Calcium Silicate Insulating Mortar

Properties: Calcium silicate insulation mortar offer good thermal insulation, high-temperature resistance, and low thermal conductivity.

Composition: They are composed of calcium silicate aggregates, typically mixed with a binder like cement or lime.

Applications: Calcium silicate insulation mortar is used in high-temperature applications, such as industrial furnaces, kilns, and thermal insulation for pipes and equipment.

Aerated Concrete Mortar

Properties: Aerated concrete mortars have excellent thermal insulation properties, high fire resistance, and good acoustic insulation.

Composition: They are composed of aerated concrete, which is produced by adding air or gas-forming agents to a cementitious mixture.

Applications: Aerated concrete mortars are used for wall construction, partitions, and thermal insulation in both residential and commercial buildings.

Foam Mortar

Properties: Foam mortars have low density, high thermal insulation, and good workability.

Composition: They are composed of lightweight aggregates, such as foam beads or cellular concrete, mixed with a binder like cement or lime.

Applications: Foam mortars are used for wall insulation, roof insulation, and as a lightweight filling material in construction.

Advantages of Thermal Insulation Mortar

a photo of Thermal insulation mortar

Thermal insulation mortar offers several advantages and benefits in construction applications. Here are some of the key advantages and benefits of thermal insulation mortar:

Improved Energy Efficiency: Thermal insulation mortar significantly reduces heat transfer through building envelopes, such as walls and roofs. It helps to create a thermal barrier, minimizing thermal bridging and heat loss or gain. This results in improved energy efficiency by reducing the need for heating and cooling, leading to lower energy consumption and cost savings.

Enhanced Thermal Comfort: By reducing heat transfer, thermal insulation mortar helps to maintain more stable indoor temperatures. This leads to enhanced thermal comfort for occupants, as it minimizes temperature fluctuations and provides a more pleasant living or working environment.

Condensation Prevention: Thermal insulation mortar helps to prevent condensation by minimizing thermal bridging. By maintaining a consistent temperature on interior surfaces, it reduces the risk of moisture accumulation and potential damage caused by condensation, such as mold growth or structural deterioration.

Noise Reduction: Thermal insulation mortar has additional acoustic insulation properties, reducing the transmission of airborne sound. It helps to create a quieter indoor environment by absorbing and damping sound waves, improving acoustic comfort, and reducing noise pollution.

Reduced Environmental Impact: By improving energy efficiency, thermal insulation mortar contributes to the reduction of greenhouse gas emissions. It lowers the demand for heating and cooling, resulting in decreased reliance on fossil fuel-based energy sources. This promotes sustainability and helps mitigate the environmental impact of buildings.

Fire Resistance: Certain types of thermal insulation mortar offer enhanced fire resistance properties. They can help inhibit the spread of flames and limit the damage caused by fire, contributing to the overall fire safety of a building.

Versatility and Ease of Application: Thermal insulation mortar is versatile and can be applied to various surfaces, including masonry, concrete, and lightweight concrete blocks. It is typically easy to mix and apply, making it convenient for construction professionals.

Longevity and Durability: Thermal insulation mortar is designed to provide long-lasting performance and durability. It resists weathering, moisture, and other environmental factors, ensuring its effectiveness over time.

Properties and Performance of Thermal Insulation Mortar

a photo of Thermal insulation mortar

When selecting an insulation mortar, several properties, and performance factors should be considered to ensure its effectiveness and suitability for the intended application. Here are some key properties and factors to consider:

Thermal Conductivity: The thermal conductivity of the insulation mortar determines its ability to resist heat transfer. Lower thermal conductivity values indicate better insulation performance. Select a mortar with low thermal conductivity to effectively reduce heat flow through the building envelope.

Compressive Strength: The compressive strength of the insulation mortar is important for structural integrity and load-bearing capacity. It should be sufficient to withstand the anticipated loads and stresses in the application area.

Durability: Consider the durability of the insulation mortar, especially its resistance to moisture, weathering, and other environmental factors. It should be able to maintain its thermal insulation properties and structural integrity over an extended period.

Water Absorption: Insulation mortars should have low water absorption to prevent moisture ingress and damage to the building envelope. High water absorption can lead to decreased thermal performance and potential issues such as mold growth or material degradation.

Fire Resistance: Depending on the application and building requirements, consider the fire resistance properties of the insulation mortar. Look for mortars with appropriate fire ratings and compliance with relevant fire safety standards.

Compatibility: Ensure that the insulation mortar is compatible with the substrate and other materials in the construction assembly. It should adhere well to the surface and form a strong bond.

Application Method: Consider the application method and requirements. Some insulation mortars may be spray-applied, while others are trowel-applied. Choose a mortar that suits the application technique and offers ease of installation.

Environmental Considerations: Assess the environmental impact of the insulation mortar, including its embodied carbon footprint and potential for recyclability or reuse. Look for products with sustainable certifications or those made from recycled or eco-friendly materials.

Code Compliance: Ensure that the selected insulation mortar complies with relevant building codes, regulations, and industry standards. It should meet the required performance criteria and safety requirements.

Manufacturer Reputation and Support: Consider the reputation and track record of the manufacturer or supplier. Reliable technical support, documentation, and warranty are important factors to ensure the quality and performance of the insulation mortar.

Application Techniques for Thermal Insulation Mortar

a photo of Thermal insulation mortar

Thermal insulation mortar can be applied using various construction techniques, depending on the specific requirements of the project and the type of insulation system being used.


Rendering is the application of a layer of insulation mortar directly onto the surface of a wall or substrate.

The mortar is mixed according to the manufacturer’s instructions and applied using a trowel or spray equipment.

The mortar is spread evenly and leveled to achieve a uniform thickness and smooth finish.


Spraying is a technique commonly used for larger areas or when a faster application is desired.

The insulation mortar is mixed to the proper consistency and sprayed onto the substrate using specialized spray equipment, such as a hopper gun or spray machine.

The spray technique allows for quick and efficient coverage of the surface, ensuring even distribution of the insulation mortar.


Laminating involves the application of pre-formed insulation boards or panels onto the substrate using insulation mortar as an adhesive.

The mortar is applied onto the back of the insulation boards or panels, and they are then pressed firmly onto the surface.

The boards or panels are positioned with care to ensure proper alignment and coverage.

Insulation System Installation

Thermal insulation mortar is often used as part of a complete insulation system, such as external insulation systems (EIFS) or insulated sandwich panel systems.

The mortar is applied to the substrate, and insulation boards or panels are then placed onto the mortar bed.

Additional layers of insulation mortar and reinforcement mesh may be applied to further enhance the system’s thermal insulation and strength.

The system is finished with a final layer of insulation mortar, followed by a protective coating or render.

Joint and Gap Filling

Thermal insulation mortar can be used to fill joints, gaps, or voids in the insulation system or between insulation boards or panels.

The mortar is mixed to the appropriate consistency and applied to fill the gaps, ensuring a seamless and continuous thermal barrier.

Proper Installation and Maintenance

a photo of Thermal insulation mortar

To ensure proper use and maintenance of insulation mortar, it is important to follow the manufacturer’s instructions and guidelines. Here are some general guidelines for using and maintaining insulation mortar correctly:

Surface Preparation

Ensure that the substrate or surface is clean, dry, and free from dust, grease, or any loose particles.

Repair any cracks or damaged areas on the surface before applying the insulation mortar.

Prime the surface, if recommended by the manufacturer, to improve adhesion.

Mixing and Application

Follow the manufacturer’s instructions for mixing the insulation mortar, including the proper water-to-mortar ratio and mixing time.

Use clean containers and appropriate tools for mixing, such as a paddle mixer or mortar mixer.

Apply the insulation mortar evenly and consistently to the surface using the recommended application technique, such as rendering, spraying, or laminating.

Ensure proper coverage and thickness of the insulation mortar, as specified by the manufacturer or project requirements.

Use a trowel or appropriate tools to smooth and level the mortar surface, if necessary.

Curing and Drying

Allow the insulation mortar to cure and dry according to the manufacturer’s recommendations.

Protect the freshly applied mortar from excessive moisture, rain, direct sunlight, or extreme temperature changes during the curing process.

Provide adequate ventilation to allow proper drying of the mortar.


Inspect the insulation mortar periodically for any signs of damage, cracks, or detachment.

Address any identified issues promptly to prevent further damage or deterioration.

Avoid harsh or abrasive cleaning methods that could damage the insulation mortar.

Follow the manufacturer’s recommendations for any required maintenance or repairs.

Monitoring Performance

Monitor the performance of the insulation mortar in terms of thermal insulation effectiveness, adhesion, and durability.

Evaluate the insulation system periodically to ensure it continues to meet the desired thermal performance and structural requirements.

Consult with professionals or experts if there are any concerns or issues regarding the insulation mortar’s performance.

Applications of Thermal Insulation Mortar

a photo of Thermal insulation mortar

Thermal insulation mortar finds applications in various areas where thermal insulation is required to improve energy efficiency and enhance thermal comfort. Here are some common applications of thermal insulation mortar:

External Wall Insulation

Thermal insulation mortar is frequently used for external wall insulation systems.

It is applied as a layer on the exterior surface of the building walls, providing a continuous thermal barrier that helps to reduce heat transfer and improve energy efficiency.

External wall insulation systems with thermal insulation mortar can enhance the thermal performance of buildings, reduce heat loss, and contribute to cost savings on heating and cooling.

Internal Wall Insulation

In certain cases, thermal insulation mortar may be used for internal wall insulation.

It can be applied to the interior surface of the walls to improve thermal insulation, particularly in cases where external insulation is not feasible or desired.

Internal wall insulation with thermal insulation mortar helps to enhance energy efficiency and maintain a comfortable indoor environment.

Roof Insulation

Thermal insulation mortar is used for roof insulation to minimize heat transfer and improve energy efficiency.

It is applied on the roof surface or under the roof covering to create a thermal barrier that reduces heat gain in hot weather and heat loss in cold weather.

Roof insulation with thermal insulation mortar helps to maintain stable indoor temperatures, reduce energy consumption, and improve overall thermal comfort.

Floor Insulation

Thermal insulation mortar can be used for insulating floors to prevent heat transfer between different levels of a building.

It is applied to the under-surface of the floor, providing thermal insulation and reducing heat loss or gain through the floor structure.

Floor insulation with thermal insulation mortar enhances thermal comfort, reduces energy consumption, and minimizes heat transfer between different areas of a building.

Pipe Insulation

Thermal insulation mortar is used for insulating pipes and ducts to prevent heat loss or gain during the transport of fluids or air.

It is applied as a layer around the pipes to create thermal insulation, improving energy efficiency and maintaining desired temperature levels.

HVAC Systems

Thermal insulation mortar can be used for insulating HVAC (heating, ventilation, and air conditioning) systems, such as air ducts and equipment.

It helps to prevent heat transfer and improve the efficiency of HVAC systems, reducing energy consumption and enhancing thermal performance.

Sustainability and Environmental Impact

a photo of Thermal insulation mortar

Thermal insulation mortar can contribute to sustainability and reduce environmental impacts in several ways:

Energy Efficiency: By improving the thermal insulation of buildings, thermal insulation mortar helps reduce the need for heating and cooling. This results in lower energy consumption, reduced greenhouse gas emissions, and decreased reliance on fossil fuels. Energy-efficient buildings have a smaller carbon footprint and contribute to overall environmental sustainability.

Reduced Heat Loss or Gain: Thermal insulation mortar minimizes heat transfer through building envelopes, such as walls, roofs, and floors. This reduces the demand for mechanical heating and cooling, leading to energy savings and lower environmental impact.

Resource Conservation: Using thermal insulation mortar can help conserve natural resources by reducing the need for additional construction materials, such as heavier wall systems or thicker insulation layers. It optimizes the use of materials and promotes resource efficiency.

Waste Reduction: Thermal insulation mortar can be manufactured with recycled or low-impact materials, reducing the demand for virgin resources. Additionally, the use of thermal insulation mortar can extend the lifespan of buildings by enhancing energy efficiency, thereby reducing the need for renovations or replacements and minimizing waste generation.

Improved Indoor Environmental Quality: Thermal insulation mortar helps create a more comfortable indoor environment by reducing temperature fluctuations and minimizing the reliance on mechanical heating and cooling systems. This contributes to improved indoor air quality and occupant well-being.

Durability and Longevity: Thermal insulation mortar is designed to provide long-lasting performance. Its durability reduces the need for frequent maintenance or replacement, reducing the environmental impact associated with the production, transportation, and disposal of materials.

Carbon Reduction: The production of thermal insulation mortar can be optimized to reduce the carbon footprint. This includes incorporating sustainable manufacturing practices, utilizing renewable energy sources, and reducing greenhouse gas emissions during production processes.

Eco-Friendly Materials: Some manufacturers offer thermal insulation mortars made from eco-friendly and recyclable materials. These materials help minimize environmental impact throughout the lifecycle of the product.

a photo of Thermal insulation mortar

Thermal insulation mortar offers a versatile and effective solution for enhancing energy efficiency, improving comfort, and reducing environmental impact in buildings. By understanding the various types, advantages, properties, and application techniques of thermal insulation mortar, construction professionals and homeowners can make informed decisions in their pursuit of sustainable construction practices. With its ability to minimize heat transfer, prevent condensation, and reduce energy consumption, thermal insulation mortar emerges as a key component in creating energy-efficient and comfortable living spaces.

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