Insulating existing solid walls can vastly improve the energy efficiency of the building, giving greater comfort and living conditions and reducing heating costs resulting in lifetime energy bill savings. With a large percentage of a building’s heat loss occurring through the walls, it is important to combat this by installing appropriate insulation. Internal dry lining of solid walls is particularly effective for retrofit projects where there is a requirement to improve the U-values of the building. The addition of internal wall insulation may have a small impact on the internal floor space, but will help significantly reduce heat loss and improve the structure’s U-value.

The type of wall structure will determine the insulation installation method used. For uneven wall -surfaces, the fixing of timber battens to provide an even surface for the insulation boards is best in order to achieve a uniform layer of insulation and prevent thermal bridging issues.

PIR wall insulation boards will provide excellent thermal performance with simple installation. Mannok Therm Wall / MW insulation boards can be used for this application, and with a double foil facing will provide superior thermal performance.

Alternatively, Mannok Therm Laminate-Foil / MLF PIR insulation boards may be used to eliminate the requirement for an additional layer of plasterboard for the internal finish. These insulation boards are also foil faced on the inner side and have a plasterboard facing on the other side.

The low emissivity foil facings on each of these insulation boards increase the thermal resistance and improves the overall thermal performance of the wall. It also minimises the board thickness required to achieve the design U-value, which is an important consideration when applying internal insulation.