Building textiles protect roofing frames from the weather. In addition, they also act as a water-repellent skin and ensure the necessary venting of the roof truss. Powerful adhesives play a significant role in providing these functions. Demands on building projects in regard to energy efficiency are permanently growing. Heat insulation for roofs is taking up more space, which often goes at the expense of the ventilation system. Therefore, the requirements for building textiles such as roofing liners are also increasing. In addition to protecting the roofing frame, modern roofing liners also play a major role in facilitating a proper venting. Roofing adhesives are applied manually and therefore ease of installation plays an important role. The textiles and in consequence the rolls, must be not too heavy for the roofer, as well as easy to transport and handle on the roof. In addition, the material has to be tear-resistant, provide a slip-resistant surface and be convenient to work with, for instance easy to cut. Once installed, the roofing adhesive insulations protects the roofing frame and acts often for extended periods as temporary roof covering, taking over the function of tiles.
Therefore, the material has to be impermeable and provide high and durable resistance against different climatic conditions and external influences. This includes rain, heat and UV resistance, flexibility at low temperatures and wind-tightness, as well as increased strength to resist stretching and tearing during installation. These characteristics are tested already during manufacturing in simulations to ensure that the necessary requirements are fulfilled. In addition to protecting the roof deck, the roofing liner has to be breathable to facilitate a proper venting of the roof truss and allow excess moisture to pass through the fabric for a proper moisture exchange. Fast drying and a high diffusion capacity are therefore a prerequisite for protecting the wooden roofing frame against mould especially at higher temperature differences between inside and outside. Powerful adhesives play a major role in the manufacture of functional building textiles. Modern hot melt adhesives based on polyolefin and polyurethane support the functional properties of those textiles, for instance strength paired with breathability. Roofing liners consist of a multilayer structure of different nonwovens which are laminated with a breathable PU or PE membrane. Superior underlining may also include a PE netting which increases the strength of the material compound. To Get TOC, Click Here
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