Although DELTA Systems are by comparison, easy to install, it must be recognized that the correct diagnosis of the problem is essential so that DELTA Systems can be designed and tailored to the needs of the building, to give the best possible performance. It is therefore recommended that only competent specialist contractors, who understand dampness, and the associated problems, be employed to survey the site, install the system and thereby ensure the best possible performance of the system.

DELTA Systems are installed by a Nationwide network of specialist contractors who are holders of "Registered Installers" Certificates.