Compression Testing of Thermal Insulation Products for Buildings | BS EN 826
Thermal insulation products used in buildings can be subjected to compressive loads during installation and throughout their service life. Floor insulation, roof insulation and other load-bearing insulation products must be capable of supporting these loads without excessive deformation or loss of performance.
Insufficient compressive strength or stiffness can lead to excessive deformation, dimensional changes and reduced structural performance within the building system. Differences in material density, cellular structure, manufacturing conditions and product thickness can all influence how an insulation product behaves under compression.
Compression testing to BS EN 826 provides a standardised method for evaluating the compressive behaviour of thermal insulation products used in building applications. The results can support product development, comparative material assessment, quality assurance and demonstration of product performance.
What BS EN 826 Testing Involves
BS EN 826 specifies equipment and procedures for determining the compressive behaviour of thermal insulation products used in building applications.
During testing, a specimen is positioned between two parallel compression platens and subjected to a controlled compressive load. The relationship between applied force and specimen deformation is measured, allowing the relevant compressive characteristics of the insulation product to be determined.
Testing can be applied to thermal insulation products including:
- Rigid insulation boards
- Foam insulation products
- Mineral-based insulation
- Cellular insulation materials
- Fibre-based insulation products
- Insulation panels
- Load-bearing thermal insulation products
- Insulation intended for floors, roofs and other building applications
Depending on the behaviour of the product during testing, results can include:
- Compressive stress at 10% deformation
- Compressive strength
- Maximum compressive force
- Deformation under compression
- Stress-deformation behaviour
- Comparative compressive performance
For products that exhibit a clear failure before reaching the specified deformation, compressive strength can be determined. For materials that continue to deform without a distinct failure, the compressive stress at 10% deformation provides a standardised measure of performance.
Where repeated or cyclic compression behaviour is of interest, a tailored mechanical test programme can also be used to investigate how an insulation product responds to repeated loading and unloading cycles.
Methodology
At Impact Solutions, compression testing of thermal insulation products is carried out using calibrated mechanical testing equipment in accordance with BS EN 826.
A typical testing programme includes:
- Identification of the thermal insulation product and required test conditions.
- Preparation of representative test specimens.
- Conditioning of specimens under the required environmental conditions.
- Measurement of specimen dimensions and thickness before testing.
- Positioning of the specimen centrally between parallel compression platens.
- Application of a controlled compressive load in accordance with the test method.
- Continuous measurement of force and deformation throughout the test.
- Identification of maximum force or the force corresponding to the specified deformation, as applicable.
- Calculation of compressive strength or compressive stress at 10% deformation.
- Comprehensive reporting of specimen details, test conditions, results and relevant observations.
For bespoke cyclic compression programmes, defined loading and unloading cycles can be applied to investigate changes in deformation, stiffness or mechanical behaviour following repeated compression.
Relevant Industry Applications
Compression testing to BS EN 826 is widely applicable to:
- Building insulation products
- Floor insulation
- Flat roof insulation
- Pitched roof insulation
- Wall insulation systems
- Rigid insulation boards
- Foam insulation products
- Insulated panels
- Construction materials
- Product development
- Manufacturing quality assurance
- Comparative material assessment
- Research and development
- Performance verification
Benefits of Compression Testing to BS EN 826
- Determines the compressive behaviour of thermal insulation products
- Measures compressive stress at 10% deformation where applicable
- Determines compressive strength where a defined failure occurs
- Provides quantitative stress-deformation data
- Supports assessment of insulation intended for load-bearing applications
- Enables comparison between different insulation materials and constructions
- Supports product development and material optimisation
- Helps evaluate manufacturing consistency
- Provides mechanical performance data for technical documentation
- Supports quality assurance and performance verification
- Uses a recognised European test method for thermal insulation products
Need to assess the compressive performance of your thermal insulation products?
Contact Impact Solutions to discuss compression testing to BS EN 826 or bespoke cyclic compression testing and obtain reliable mechanical performance data for thermal insulation products used in building applications.
FAQ
Q: What is BS EN 826?
BS EN 826 specifies a test method for determining the compressive behaviour of thermal insulation products used in building applications.
Q: What does BS EN 826 measure?
The method can be used to determine compressive strength or compressive stress at 10% deformation, depending on the behaviour of the insulation product during testing.
Q: What is compressive stress at 10% deformation?
Compressive stress at 10% deformation is the compressive stress corresponding to a reduction in specimen thickness of 10% relative to its initial thickness. It provides a standardised measure for insulation products that may deform substantially without exhibiting a distinct compressive failure.
Q: What types of insulation products can be tested?
The method can be applied to a range of thermal insulation products for buildings, including rigid boards, foam materials, cellular insulation, fibre-based products and other insulation materials suitable for compression testing.
