Revisable branch channel “Subterra”

Branch channels installed onto a green roof space direct this excess water under the planting soil and drainage layers to the nearest outlets. Rainwater on roof terraces and balconies is similarly directed from the loose material down under the surface area and on towards the drain. Branch channels are usually attached to the drain slots in the dewatering channels within the drainage layer. However, there is no firm connection between the channel body and branch channel, meaning rainwater does not always flow into the installed channel. Our innovative branch channel system “Subterra” is here to solve this problem. 

The solution to the problem lies in our drainage channels: pre-perforated cut-out sections allow the channel to be connected at different points. An adapter that fits into the opening serves as a connecting piece for the aluminium branch channel. The integrated dirt trap also prevents leaves, dirt and loose material from making its way into the system. As the “Subterra” system is especially suited to green roofs, this feature also ensures reliable dewatering in the long term. 

Thanks to its intelligent clip system, the channel can be installed in just a few easy steps. We manufacture the branch channel in a standard length of 3 metres. This can however be extended using connectors depending on the installation situation. Side branches and curves are also manageable without the need for additional resources thanks to T-pieces and corners in 90° and 30° angles. However, the user is not restricted to the standard models here: cut in half along the perforation lines, 90° corners are made into 45° and 30° to 15° corners. 
Inspection shafts lend themselves particularly well to visual inspections of the drain. They are also integrated into the branch channel system and feature cut-outs on three of their four sides where branch channels can be attached. The 100mm high shafts can optionally be raised by 50mm and 100mm using stacking elements. 

Our “Stabile” drainage channel is also offered in a special design featuring pre-perforated cut-out sections that can be combined with the “Subterra” system. Upon request, all channels produced by us can be adjusted specifically for this application in a standard design height.