The No. 1 Manufacturer of Waterproofing and Drainage Membranes in North America

Please find a complete overview of our full DELTA product range by clicking on 'Products' in the navigation bar above.

DELTA® Roof Underlayments - Something new under the Roof

Starting with a launch at the February 2008 International Builders Show, Cosella-Dörken, the leading manufacturer of synthetic roof underlayments in the most demanding market in the world – Europe – is bringing its leading-edge products to North America.

Advanced synthetics such as Cosella-Dörken’s DELTA® line can transform the roof from a passive barrier to an environmental system, saving energy by reflecting summer heat away from your home and keeping it healthier by wicking excess moisture out of the house to prevent dangerous molds. For the pro roofer or do-it-yourselfer, synthetic underlayments from Cosella-Dorken are designed to be easy to install, safer to walk on than old-style felt, extremely tear-resistant and so tough they can be left uncovered for months at a time

DELTA-DRY - Weather Resistive Barrier & Drainage Membrane

The new DELTA-DRY is a weather-resistive barrier and drainage membrane with outstanding drainage and drying characteristics for residential and commercial construction. Due to the double sided dimple structure of the membrane breathability is provided on both sides of the product, allowing moisture to escape.

The performance of this innovative approach of protecting the building envelope has been validated through testing at the University of Waterloo and Oak Ridge National Laboratory.