Onduline underlay roofing systems offer the best waterproofing performance even with pitches as low as 12.5 degrees (BBA Accredited), on all types of roof and with any covering. Due to their versatility, the ISOLINE systems are ideal for restructuring projects and are the most widely used in the reconstruction of the roofs of historical buildings with a high artistic and architectural value.
Waterproofing, ventilation, insulation and ease of laying: the advantages of Onduline underlay systems.
In Mediterranean building tradition, round tiles are commonly used on the roofs of historical buildings, churches, castles, ancient villas and in historic town centres and villages. From the aesthetic point of view, round tile roofs have no equal but the restoration of a roof of this kind is a long and complex process involving numerous variables.
ISOLINE UNDERLAY SYSTEMS
ISOLINE underlay corrugated sheets solve in a simple, inexpensive and definitive way all problems of water infiltration, moisture penetration and water stagnation even with a low pitch, while with very steep pitches they are greatly appreciated for their stability and the possibility of fixing the covering elements mechanically, using completion accessories such as metal grating and special hooks.
Prolonging the life of a roof
The ISOLINE underlay systems from ONDULINE enable ventilated, insulated and fully waterproof coverings to be laid even at very low pitches, down to 15%. The undulating profiles of the ISOLINE underlay sheets ensure a double air flow that keeps the structure healthy and perfectly dry and prolongs the life of the roof covering, as well as significantly increasing comfort for the occupants of the buildings.
Fast and efficient installation
From the installation point of view, the ISOLINE underlay ensure unrivalled laying rapidity. In fact, the covering can be laid directly on top of the deteriorated existing waterproofing, thus saving the high costs of dismantling it. In addition, the special profile of the sheets enables the round tiles to be laid directly on the flat parts of the sheets, even if the tiles differ considerably from one another as is often the case when renovating old buildings with roofs built centuries previously in successive layers.
Robust underlay sheets
The ISOLINE underlay roofing sheets are very robust and sturdy enough for walking on, obtained by adding special thermosetting resins to the material, thus offering the installers high stability and safety throughout the laying procedure.
Adaptable underlay system
Due to their extreme flexibility, ISOLINE underlay roofing sheets adapt easily to any kind of concrete support, continuous or discontinuous wood and also metal structures, ensuring a stable roof without any need for glue or mortar.
A vast range of accessories practically and functionally completes every kind of tile roof.
It is no longer necessary to choose between a large number of models to be laid under tiles that differ in the pitch of their lathing or numerous models to be laid under round tiles with different profiles and sizes, there is now a single product that adapts to all kinds of standard tiles and may also be used under round tiles, thus simplifying considerably the choice and management of the work site.