The ideal thickness for loft roll insulation depends on your specific insulation needs and the space available in your loft. Generally, a thickness of 100mm to 200mm is common for effective thermal insulation. For example, our Knauf Earthwool Acoustic Roll Insulation comes in various thicknesses, such as 75mm, 100mm, and 150mm, each suited to different insulation requirements.

The thickness you choose should align with the level of insulation you need and the space constraints of your loft.