Applications > Application > Roofs > Pitched Roofs Pitched roof insulation Pitched roof insulation is suitable for new roofs, refurbishing a roof or doing a loft conversion. It can be installed between and under rafters or between and over rafters depending upon your preference. Kooltherm K18 Insulated Plasterboard Insulated dry-lining plasterboard for mechanical fixing Read More about Kooltherm K18 Insulated Plasterboard Kooltherm K7 Pitched Roof Board Rafter level insulation for tiled or slated pitched warm roof spaces Read More about Kooltherm K7 Pitched Roof Board nilvent Breathable membrane for unventilated pitched roofs Read More about nilvent