What Is Thermal Insulation?

• October 21, 2025

What Is Thermal Insulation? The Most Effective Insulation Types and Prices (2025 Updated Guide)

What Is Thermal Insulation and Why Is It Important?

Thermal insulation (also known as external wall insulation) is a system applied to the outer walls of a building to reduce heat loss, increase energy efficiency, and protect the structure from external factors.

In simple terms, insulation acts like a protective jacket for your building — keeping it warm in winter and cool in summer.
It reduces heating costs and creates a comfortable living environment.

Insulation can be applied in all climate regions of Türkiye and significantly extends the life of the building.

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Purpose and Benefits of Insulation

Thermal insulation is not only about energy savings — it also protects the health of your building.

• Saves Energy

Prevents heat loss in winter and heat gain in summer, providing up to 40% energy savings.

• Prevents Moisture and Mold

Eliminates condensation, humidity, and mold problems on interior walls.

• Increases Comfort and Property Value

Maintains a stable indoor temperature, providing both comfort and higher property value.

• Eco-Friendly

Reduces carbon emissions and contributes to a sustainable urban environment.

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The Most Common Types of Insulation (2025)

Different insulation materials are used depending on budget, location, and building type.
Here are the most preferred insulation systems in 2025 ????

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1️⃣  EPS Insulation (Expanded Polystyrene)

Material: Lightweight, affordable, and efficient insulation foam.
Advantages:

• Easy to install, suitable for most surfaces

• Cost-effective

• Provides high thermal efficiency
  Disadvantage: Limited fire resistance — not ideal for high-rise buildings without additional safety layers.

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2️⃣ XPS Insulation (Extruded Polystyrene)

Material: Water-resistant foam with high compressive strength.
Advantages:

• Excellent water resistance

• Suitable for damp areas and below-grade applications

• Minimizes heat loss
  Applications: Basements, foundations, floors, and roofs.

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3️⃣ Rock Wool Insulation (Mineral Wool)

Material: Made from natural basalt rock melted at high temperatures.
Advantages:

• Non-combustible (A1 fire rating)

• Excellent sound insulation

• Breathable structure prevents moisture accumulation and mold
  Applications: Hospitals, schools, hotels, and high-rise buildings.

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4️⃣ Polyurethane (PU) Spray Foam Insulation

Material: Applied as a liquid spray, expanding into a solid foam.
Advantages:

• Seamless and gap-free coverage

• Superior thermal performance

• Quick application time
  Disadvantage: Higher cost compared to other insulation systems.

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⚖️ Which Insulation System Is the Best?

Summary:

• For homes: EPS is the most economical.

• For humid areas: XPS performs best.

• For fire safety: Rock wool is ideal.

• For modern high-performance projects: Polyurethane is preferred.

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 Insulation Prices in 2025

Average insulation prices vary depending on materials, façade height, and workmanship quality.

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Energy Performance Certificate (EPC) and Insulation Requirement

According to Turkey’s Energy Performance in Buildings Regulation, thermal insulation is mandatory in all new constructions.
External wall insulation is one of the main criteria for obtaining an Energy Performance Certificate (EPC).

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Professional Insulation Service by Efil İnşaat

At Efil İnşaat, we provide professional EPS, XPS, Rock Wool, and Polyurethane insulation systems
tailored to your building’s needs.

Contact us today and make your home warmer, more energy-efficient, and long-lasting. Efil İnşaat – The trusted name in external wall insulation.