DELTA®-TRELA PLUS 
Structured separating layer for ventilated and non-ventilated pitched roofs with metal covering. As DELTA-TRELA PLUS, with integrated self-adhesive edge for fast, windproof laying.

• The optimum underlay for metal – clad roofs.
• Reduces Rainfall Noise by up to 15%. dB.
• DELTA®-TRELA allows residual water vapour in rafters and sheathing to escape due to the high permeability (Sd value approx. 0.02 m) of the base sheet.
• Consists of a base sheet laminated with a 8 mm thick dimple-textured random-fibre mat.

DELTA®-TRELA PLUS Don’t give moisture a chance to accumulate on the underside of your metal roof. Stamp out corrosion once and for all, thus effectively protecting the intrinsic value of your representative architecture

 DELTA-TRELA roof Manta house, Техаs>>>>

Technical data 

Quality - made in Germany

"Our products are up to any test."

Dörken keep setting new standards of quality, offering all-round solutions for roofs and cellars. The outstanding track record of its products, its comprehensive technical knowhow, and its excellent service have made Dörken GmbH & Co. KG one of the leaders in the European market for building materials. For more than 50 years, high-quality laminated sheets for roofs, façades, and cellars have been made in Herdecke under the brand name DELTA®. 

Rigid quality controls – for sophisticated demands.
First-class materials, continuously and strictly monitored at every stage of the manufacturing process, guarantee enduring functionality and a long life. For us, quality means that our customers are satisfied and their expectations have been more than fulfilled. This implies constantly checking, reviewing, and improving products and processes. To think everything through down to the smallest detail: having fulfilled this ambition for more than 120 years, Dörken remains a powerful partner of dealers, planners, and craftsmen.

Those who rely on our products will reap long-term benefits.
Our promise 'DELTA® protects property. Saves energy. Creates comfort.' may be taken literally. For our system solutions from roof to cellar produce convincing
results – worldwide. This is because the quality of our products 'made in Germany' is high, our solutions are adapted to practical conditions, products and accessories can be combined to fit exactly, and the service we offer you is excellent right from the start. 

Made in Germany – to us, more than a mere seal of quality.
Join all those who benefit from the extreme dependability and lasting functional reliability of our innovative and efficient products of proven Dörken quality which we continuously check and improve in our own test laboratories. And you may not only rely on top-quality materials. For more than 50 years, composite sheets of sustainably good quality for cellars, façades, and roofs have been made in Germany . At our group headquarters in Herdecke as well as in Hagen-Vorhalle, in one of Europe 's leading-edge production facilities for spunbonded cloth. Not for nothing are we market and technology leaders in this field across Europe