XO/SK (T&G) is an engineered tongue and grooved external roof insulation system with robust facings which meets the passive U-value of 0.15 W/m2K. Using XO/SK improves detailing, speeds up the installation process and provides a uniform plane to detail more effectively.
| Sub Brand | Xtroliner |
| Fire Declaration | Euroclass C s2 d0 |
| Material | PIR or Polyisocyanurate insulation |