OPTIM-R Flooring System
Optimum performance solution
Choosing the right suspended floor insulation matters
Suspended floor insulation is important when building over unheated spaces. Fitted between timber joists, it improves thermal performance and supports better energy efficiency across the building.
We offer a range of products to suit your needs, depending on the amount of space you have and the level of thermal performance you want to achieve. Our insulation boards can be easily cut to friction fit between joists, and our vacuum insulation panels come as part of a set with infill boards that can be cut to fit. This is especially helpful in older buildings where space between joists can be limited.
Once you have chosen your product, don't forget to take a look at our guide on how to insulate under a suspended timber floor.
On this page you will find:
- Our suspended floor insulation products from our OPTIM-R, Kooltherm and Therma ranges.
- A comparison of the different solutions we offer so you can select the right product for your project.
- Useful links to help with your project, including how to find a stockist and installation advice.
If you are a homeowner don't forget to take a look at our Homeowner Hub where you can find a wealth of advice and support for your project!
We have a number of different solutions for suspended floors, depending on the design and performance requirements. Scroll down for full comparison table.
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Floor Insulation Solution
Compare our Suspended Floor Insulation Solutions
Material | Advantages | Products |
|---|---|---|
Vacuum insulation panels (VIPs) | Suited to applications where there may be a requirement for both low U-values and the thinnest possible roof build-up Problem solver for where a lack of construction depth or space is an issue Declared thermal conductivity of just 0.007 W/mK Design service for your specific floor | |
Phenolic | Rigid insulaton with a thermal conductivity of 0.019 W/mK One of the thinnest commonly used insulants for pitched roofs, allowing U-values to be reached with minimal thickness Unaffected by air infiltration and resistant to the passage of water vapour Easy to handle and install compared to some other commonly used insulants | |
PIR | Rigid insulation with a thermal conductivity of 0.022 W/mK Unaffected by air infiltration and resistant to the passage of water vapour Easy to handle and install compared to some other commonly used insulants |
Page updated - 04/07/2025