The roof

A property’s roof not only has to provide protection from the weather such as rain, snow or wind, it is also tops off the building, contributing to the feeling of comfort and well-being inside the home by providing professional sealing and insulation.
Whether sloping or flat, the roof’s design plays a decisive role in influencing the character of the house. A sloping roof calls for metal materials (zinc and aluminium), slate and clay tiles, while a flat roof is sealed with synthetic sheeting.

We are providing roofing for our properties entirely according to our clients’ wishes. Eventual listed-building requirements can be taken into account. We offer roofing tiles and stone in a wide variety of shapes and colours and only use top-quality materials. We work closely with regional firms and purchase materials from companies such as Rheinzink.


Carpentry is an important part of the JANS groupe. Our employees are master craftsmen in joining and roofing. They are responsible for making sure our properties are given perfectly insulated and sealed roofs.
Constructing the timber framework is the first step in making a roof. Depending on the size of the house or the architect’s plans, the framework is prefabricated in our carpentry workshop. The frame is always constructed according to plans and measurements and then systematically assembled.

JANS toitures focus on quality and almost exclusively use KVH solid structural timber. KVH is extremely high-grade timber, industrially produced from coniferous wood and available in spruce, fir, larch, pine and Douglas fir. Our employees’ highest priorities are sustainability, ecology and economy.

However, our carpentry workshop produces more than just roofs: our portfolio also includes carports, pavillions and timber-framed houses in accordance with the wishes of the client.

Insulation & blow-in process

A homeowner is only able to experience comfort and satisfaction, when a house is perfectly insulated. Cold floors, draughts and moisture from outside are factors that can considerably reduce a sense of well-being. In order to avoid this being the case for JANS groupe clients, we use the so-called blow-in process.
In contrast to the traditional procedure, the blow-in method does not involve insulation material being placed within the timberwork frame and then sealed with damp-proof foil and plasterboard. When using this particular technique, wood fibre material is filled into a machine, compressed through a flexible hose and scattered into the cavity between timberwork and interior wall. The loose fibres are thus optimally dispersed throughout the cavities and fill them with millimeter accuracy.

This process provides a sustainable and eco-friendly insulation. In place of a vapor block, we install a permeable vapor retarder, ensuring an optimal exchange of humid and dry air and preventing draughts coming from leaks in the insulation. The natural raw material ensures an extremely pleasant indoor climate in winter and summer alike and in addition, the wood fibres contribute to good acoustics.