Bautherm XPS | Technical Specifications, Applications, and Advantages

03/07/2026

Bautherm XPS | Technical Specifications, Applications, and Advantages

What Is Bautherm XPS?

Bautherm XPS, manufactured by UKS Yapı, is an extruded polystyrene (XPS) thermal insulation board that combines high compressive strength, low thermal conductivity, and excellent water resistance. It is specifically designed to provide long-lasting and reliable insulation in load-bearing and moisture-prone applications.

Today, thermal insulation is essential not only for comfort but also for energy efficiency, sustainability, and extending the lifespan of buildings. In areas exposed to structural loads and moisture—such as foundations, floors, roofs, and façades—the insulation material must offer outstanding mechanical performance and resistance to water. Bautherm XPS meets these requirements with its advanced technical properties.

What Is XPS?

XPS (Extruded Polystyrene Foam) is a high-density thermal insulation material with a closed-cell structure. Its homogeneous composition provides several important benefits:

  • Minimizes heat transfer
  • Offers extremely low water absorption
  • Delivers excellent compressive strength under heavy loads

Bautherm XPS boards are specifically engineered for demanding applications where long-term durability and performance are required.

Technical Specifications

PropertyValue
Thermal Conductivity (λ)0.030–0.035 W/mK
Compressive Strength250–500 kPa
Water AbsorptionLess than 1%
Density30–45 kg/m³
Water Vapor Diffusion Resistance (μ)80–120
Board Dimensions60 × 125 cm or 60 × 120 cm
Thickness Range20–100 mm

Applications

Bautherm XPS is suitable for a wide range of construction applications thanks to its exceptional load-bearing capacity and moisture resistance.

1. Floor and Under-Slab Insulation

  • Compatible with underfloor heating systems
  • Can be installed directly beneath screed
  • Suitable for areas exposed to vehicle traffic

2. Inverted Roof and Terrace Systems

  • Excellent water resistance
  • Installed above waterproofing membranes in inverted roof systems
  • Withstands outdoor weather conditions

3. Foundations and Basement Walls

  • Protects against groundwater and moisture
  • Resistant to freeze-thaw cycles
  • Provides long-term insulation performance

4. Exterior Wall Insulation (ETICS)

  • Suitable for external thermal insulation composite systems
  • Reduces thermal bridging
  • Compatible with plaster and façade finishing systems

Installation Guide

Floor Installation

  1. Apply a leveling concrete layer.
  2. Place Bautherm XPS boards tightly together.
  3. Install a vapor barrier and reinforcing mesh.
  4. Pour the screed and complete the final floor finish (tile, parquet, etc.).

Inverted Roof Installation

  1. Install the waterproofing membrane.
  2. Lay the XPS insulation boards over the membrane.
  3. Place a geotextile separation layer.
  4. Finish with gravel, paving slabs, or green roof systems.

Key Advantages

High Compressive Strength

Supports loads up to 500 kPa, maintaining its structural integrity even under heavy traffic and long-term loading.

Excellent Water Resistance

Its closed-cell structure limits water absorption to less than 1%, ensuring consistent insulation performance.

Energy Efficiency

Low thermal conductivity significantly reduces heat loss and helps lower heating and cooling costs.

Easy Installation

Lightweight, easy to cut, and quick to install, reducing labor time and simplifying construction.

Long Service Life

Maintains its insulation properties and structural stability for many years without sagging, deterioration, or mold growth.

Frequently Asked Questions

Should I choose EPS or XPS?

EPS is a cost-effective solution for façade insulation. However, for foundations, floors, roofs, and other areas exposed to moisture and heavy loads, XPS provides superior performance.

Is Bautherm XPS environmentally friendly?

Yes. It contains no CFCs or HCFCs and is fully recyclable.

Will it deform under underfloor heating systems?

No. Bautherm XPS is designed to withstand both elevated temperatures and high compressive loads without deformation.

Can it be used in damp environments?

Yes. It absorbs virtually no water, resists mold growth, and performs reliably in underground and moisture-exposed applications.

XPS vs. EPS Comparison

FeatureBautherm XPSEPS
Thermal ConductivityLowerModerate
Water AbsorptionVery LowHigher
Compressive Strength250–500 kPa100–150 kPa
Service Life30+ Years15–20 Years
Typical ApplicationsFloors, Foundations, RoofsExterior Walls, Interior Walls

Conclusion

Bautherm XPS is a professional thermal insulation solution that combines high compressive strength, superior moisture resistance, and low thermal conductivity. Suitable for applications from foundations to roofs, it helps improve energy efficiency, enhance structural durability, and provide long-term insulation performance for residential, commercial, and industrial projects.