Mansard and mansard roof insulation
for private homes

Mansard and mansard roof insulation: a warm living space all year round

Proper mansard insulation transforms an attic space into a comfortable and fully functional living area. Without effective thermal insulation, a mansard roof becomes one of the main sources of heat loss: rooms are cold in winter and uncomfortably hot in summer. We carry out mansard roof insulation taking into account the roof structure, roof pitch, rafter height and how the space will be used.

When mansard insulation is required

Mansard insulation is essential when the space is used or planned to be used as a bedroom, home office, children’s room or guest room. Typical signs of insufficient insulation include cold conditions in winter, overheating in summer, condensation on internal finishes and increased indoor humidity. Mansard roof insulation is also required when a mansard was originally designed as a cold attic and is later converted into a living space.

Key features of mansard roof insulation

Unlike a standard attic, a mansard is insulated along the roof slopes. Mansard roof insulation requires strict compliance with the correct technology: the appropriate insulation thickness, an airtight vapour control layer on the room side, a high-quality external membrane and a mandatory ventilation gap. Errors at this stage can lead to moisture penetration, reduced thermal performance and damage to the rafter structure.

Mansard insulation from the inside or from the outside

In most cases, mansard insulation is carried out from the inside when the roofing covering has already been installed. The insulation is placed between and beneath the rafters, followed by vapour control installation and internal finishing.

External mansard roof insulation is typically chosen for new construction or major roof refurbishment. This method allows the roof build-up to be assembled correctly and provides stable thermal insulation without thermal bridges.

How we carry out mansard insulation

Work begins with an inspection of the structure and detailed measurements. We assess rafter height, timber condition, ventilation availability, junction details and overall roof geometry. Based on this, we select the most suitable solution for mansard insulation, including insulation type, thickness, installation method and vapour control strategy.

During installation, particular attention is paid to airtight joints and connections around roof windows, chimneys and the ridge. This helps prevent condensation and ensures that the insulation maintains its performance for many years.

What affects the cost of mansard insulation

The cost of mansard insulation depends on the roof area and shape, the height of the rafter system, the selected materials and their thickness, the complexity of junctions and whether existing layers need to be removed. For this reason, enquiries such as “mansard insulation price” are best calculated after an on-site inspection or based on your measurements and photographs.

Turnkey mansard insulation — what you get

By choosing turnkey mansard roof insulation, you receive a complete service: consultation, material calculations, insulation installation, vapour and waterproofing layers, quality control and careful workmanship. As a result, the mansard becomes warm, dry and comfortable to live in throughout the year.