Applications

0° or “Totally Flat” Roofs
Structures of this type present the green roof with the problem that, no matter how much care is taken in the construction; some standing water will arise on the roof finish. This, in turn, can have a damaging effect on the vegetation if the substrate becomes saturated where localised ponding occurs and to avoid this it is necessary to use a drainage board with a profile of at least 40mm depth. Whilst Bauder have a number of products that meet this requirement, our DSE40 drainage/reservoir board is most commonly used, the choice being dependant upon a number of issues including vegetation mix, height of the roof etc. 

1°-5° “Traditional” Flat Roofs 
This roof slope is ideally suited for green roofing, allowing the use of the most cost-effective components, as drainage is easily achieved down the slope and there will only ever be very minor ponding which will not effect the living roof vegetation. Whilst Bauder have a number of products that meet this requirement, our SDF mat or DSE20 drainage/reservoir board are most commonly used, the choice being dependant upon a number of issues including vegetation mix, foot traffic requirement etc.

6°-15° “Shallow Pitch” Flat Roofs
Roofs with this degree of fall start to represent a challenge with regard to the sheer forces that can be generated by the slope both at the waterproofing/drainage board and drainage board/substrate interfaces. In addition, water retention within the substrate mix can prove challenging dependant upon the vegetation selected. The use of our 75mm deep reservoir board allows us to effectively address most of these issues, but additional anchorage may be necessary at the roof edge dependant upon the size and length of the roof. 

Whatever the slope of your roof, we would always recommend that you seek advice from the Bauder Technical Services department, to ensure that you achieve the optimum solution for your project, both on a performance and cost basis.