OPTIM-R Roofing System
Optimum performance flat roof insulation for where space is limited
Flat Roof Insulation Boards
Our optimum and high performance flat roof insulation includes Vacuum Insulation Panels (VIPs) and a range of rigid thermoset polyisocyanurate products.
Choosing the best flat roof insulation is important for any project
There are lots of important factors to consider when installing a flat roof, from thickness of materials to making the most of your budget. We can offer a number of insulation solutions to meet the requirements of your specific project.
Compare flat roof insulation materials
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 Optimum performance with a declared thermal conductivity of just 0.007 W/mK Design service for your specific roof For use with most fully adhered single-ply waterproofing membranes | |
PIR | High performance insulation - thermal conductivities as low as 0.022 W/mK Fully compatible with most mechanically fixed single-ply waterproofing systems Compatible with most green roof systems Installation technique is ideal for fast track building programmes Easy to handle and install compared to some other commonly used insulants | Thermaroof TR26 - for use with mechanically fixed single-ply waterproofing Thermaroof TR27 - for use with fully adhered single-ply, partially bonded built-up felt, mastic asphalt and cold liquid applied waterproofing |
Rigid Extruded Polystyrene (XPS) | Ideal for car park decks High compressive strength withstands vehicle loads Easy to handle and install compared to some other commonly used insulants | |
Rock mineral fibre | A1 Euroclass Fully compatible with most mechanically fixed single-ply waterproofing systems |
Check out our free online U-value calculator
Offering free, quick and easy calculations for wall, floor and roof constructions.
Easily compare how the use of different materials, or thicknesses of materials, can impact the overall thermal performance of a building. This helps to ensure you specify and install the right insulation thickness and set clear construction targets.
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Page updated 8/1/2025
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