Layer system

Temperature, moisture, mechanical and environmental influences – in order to protect the roof from these stresses, waterproofing is installed in several layers, each with a different function:

Separating layer

There are some substructures on which it is not possible, or permitted, to adhere the roofing materials directly. With timber structures in particular, important safety aspects need to be considered: a suitable separating layer is additionally required to protect the timber from the flame and to compensate for any mechanical stresses that are transmitted. The BauderFLEX TA 600 separating/compensating membrane is ideally suited to this purpose - in both new build and refurbishment projects. Its properties include great elasticity and mechanical strength.  Nail pull-out points are not an issue with this product. It is also particularly cost-effective because large roll lengths reduce installation time.

Vapour barrier

In order to prevent moisture penetrating building components, the vapour barrier must reliably prevent any diffusion from within. The BauderTHERM DS 1 DUO and BauderTHERM DS 2 fast-torchable membranes are reliable and time-saving. Their thermal stripes with activatable self-adhesive bitumen considerably shorten installation time and enable the thermal insulation to be installed more quickly and with no additional adhesive.

With trapezoidal sheet steel and timber substructures, the cold self-adhesive vapour barriers BauderTEC KSD DUO and BauderTEC DBR perform superbly as a reduced fire load vapour barrier; installation is quick and does not require a torch.

Thermal insulation layer

A layer of thermal insulation panels keeps the room temperature constant and reduces heat loss in winter. Polyisocyanurate (PIR) rigid foam is the most effective conventional insulation material, and even a thin layer provides outstanding performance: BauderPIR FA (WLS 024), BauderPIR M (WLS 028 and 030) and BauderPIR T (WLS 030) tapered insulation panels.

First layer of roof waterproofing

Long-lasting, dependable waterproofing is guaranteed with the rugged BauderFLEX torch-on elastomer bitumen membranes or the BauderTHERM UL 50, which is easy and quick to apply. Both these products can withstand extreme stress thanks to their superb cold bending properties and high heat resistance, and continue to provide reliable protection for decades. If the first layer is installed on a heat-sensitive sublayer such as EPS insulation panels, hot melt bonding is not an option. In this case a cold self-adhesive waterproofing membrane such as BauderTEC KSA DUO or BauderTEC KSA is the perfect solution.

Capping sheet

The capping sheet forms the uppermost waterproofing layer, and as such must withstand wind and weather. Its quality is of vital importance for the service life of the roof. BauderKARAT is Bauder's top-end product, and its excellent resistance to ageing far exceeds DIN requirements. The Baukubit K5K capping sheet also combines high quality with quick installation. Where fire protection requirements preclude the use of a torch, the BauderTEC KSO SN is the right choice.

For roof plantings, the root-resistant special bitumen torch-on membrane BauderPLANT E should be used.

On lightweight roof structures in particular, synthetic roof membranes represent a genuine alternative to waterproofing with  bitumen membranes. Most notably, the BauderTHERMOPLAN FPO waterproofing system, which is also root-resistant, cannot be faulted in terms of quality, durability and ease of installation.

Useful and protective layer

Alongside the structural requirements, the property owner can decide how to utilise the roof surface. A green roof will enhance the building visually, ecologically and structurally, and this opportunity should be exploited whenever possible. Areas that are to be used in different ways can be made accessible by paving. Both planting and paving also provide the waterproofing layers with additional protection against heat, cold and UV radiation.