In which orientation should mineral wool be installed?

Mineral wool is designed to provide optimal thermal insulation and soundproofing when installed horizontally. This orientation allows the mineral wool batts or blankets to lay flat against structural elements, which helps ensure uniform coverage and minimizes gaps or air spaces that could compromise insulation effectiveness. When positioned horizontally, the product covers the entire surface area, thereby maximizing its ability to prevent heat transfer and improve energy efficiency in buildings.

Additionally, installing mineral wool horizontally helps in maintaining its intended density and structural integrity, which is essential for its performance as an insulation material. This orientation not only aids in achieving the desired thermal resistance (R-value) but also facilitates easier installation, especially in floor and ceiling applications.

While vertical and diagonal orientations may seem feasible, they do not provide the same level of coverage and efficiency as horizontal installation. Random orientation would likely lead to inconsistencies in thermal performance and could create areas of weakness in insulation coverage.