
Introducing our System Calculator
Early-stage project planning often involves comparing different system options, estimating material quantities, assessing thermal performance and understanding project costs before a final specification has even been developed. To simplify this process, we have launched our new online System Calculator, designed to make early-stage project planning quicker, simpler and more accessible.
Try the System Calculator
If you want to jump right in and come back to read about it later, here are the links for the different systems:
- Retro EcoWall system calculator
An internal wall insulation system for solid walls that works in harmony with the fabric of the building. - Retro EcoWall A1 system calculator
A non-combustible internal wall insulation system for solid walls. Works in harmony with the fabric of the building. - Diathonite system calculator
A lime and cork based plaster insulating system for solid walls which helps regulate moisture and humidity; especially within older buildings. - Retro EcoFloor system calculator
An insulation system for draughtproofing and insulating a suspended timber floor. - Retro EcoLoft system calculator
A robust, natural insulation system designed to upgrade cold ventilated lofts in older or traditional homes
If you need help choosing the right system, speak to our Technical Team, otherwise, you can read on to learn more about the System Calculator.

What It Is
The System Calculator is our online tool designed to simplify early-stage project planning. Instead of selecting individual products in isolation, it guides users through a few simple questions about their project to build a complete wall, roof, floor or loft system. As each answer is selected, it instantly generates a system based on project requirements, including material quantities, costs and achievable U-values. Options can then be compared, making it easy to see how different choices affect performance and budget. Calculations can be saved to an account, assigned a project name, and returned to whenever needed.

What It’s Not
The System Calculator is a powerful planning aid. It is not a replacement for professional technical expertise. Every building is unique, and site-specific conditions, junctions and regulations still require specialist assessment. The tool helps you explore and compare options, and our technical team remains on hand to provide project-specific advice and final recommendations.
How to Use It
- Answer simple questions about the existing construction or planned build.
- Review the instant results: required products, estimated quantities, costs and achievable U-value.
- Adjust your answers to compare different configurations. See how changes in installation method, insulation thickness or system configuration affect the outcome.
- Save your calculation with a custom project name for easy reference, or if you are confident with the configuration and measurements simply add to basket to buy it.
- And remember, you can always contact our technical team for advice on your project.

Exclusive to Ecological Building Systems
The System Calculator has been developed exclusively by Ecological Building Systems for our range of wall, roof, floor and loft systems. It reflects our whole-system approach, helping users understand how different materials and design choices work together rather than considering individual products in isolation. It provides a practical starting point for exploring and comparing options, with our experienced Technical Team on hand to provide project-specific advice and support when needed.
Start planning your project with our System Calculator
Try it now and explore your project options.
- Planning an internal wall insulation project? Explore the Retro EcoWall system calculator, or the system calculator for our Retro EcoWall A1 a fire-safe, high-performance internal wall insulation system.
- Looking at solid wall insulation or damp management? Explore the Diathonite system calculator.
- Insulating a suspended timber floor? Explore the Retro EcoFloor system calculator.
- Improving loft insulation? Explore the Retro EcoLoft system calculator.
Alternatively, if you need help choosing the right system, speak to our Technical Team
Coming soon
System calculators for our Passive EcoWall and Passive EcoRoof new-build systems.
