Bitumen sheeting
A bitumen membrane is a both sides with bitumen coated building material for building waterproofing , particularly for roof sealing . It consists of a carrier material, for example glass or plastic fleece . For laying, the bitumen is flamed so that several overlapping sheets can be welded together in a watertight manner.
The bitumen welding membrane is not to be confused with the roof sealing membrane or the roofing felt, which are only laid loosely and cannot be welded. Roof sealing membranes ("DD membranes"), e.g. B. G 200 DD, are usually applied with hot bitumen. Roof sealing membranes are also laid loosely as a separating layer between bitumen welding membrane and combustible thermal insulation .
Executions
There are many different versions of welding tracks, for example sanded as a separating layer for further construction with welding tracks or DD-tracks, as well as talc-coated tracks to flame welding tracks on or slated as top layer (against UV radiation ) or welding tracks with copper inlay against holes Roots for green roofs. However, root protection membranes are also made root-proof in the top layer by chemical means. Likewise as vapor barriers z. B. with aluminum insert (Al G 200 S4 or similar designations).
A distinction is made, depending on the components used, between elastomer and plastomer welding strips. Elastomer welding sheets are created by adding SBS ( styrene-butadiene-styrene ) to bitumen, plastomer welding sheets by adding APP (atactic polypropylene ). The main differences between the two types are flexibility: APP tracks are plastic; SBS panels are elastic.
Standard sheets are produced in accordance with DIN standards and, due to their material properties, are limited to a specific requirement profile. In practice, however, the sealing requirements are often higher. This led to the development of high-quality webs whose properties far exceed the minimum requirements of the standard.
use
A welding sheet is a popular material to seal flat roofs , cellar walls or swimming pools. Since processing proves to be extremely time-consuming, especially in the wall area, thick bitumen-based coatings are increasingly being used here. Particularly in sensitive areas ( pressurized water , movement of components), however, welding tracks are still preferred due to the higher requirements.
Bitumen welding sheets are mainly used to seal concrete . Various sealing systems have established themselves particularly in the sealing of bridges. For road bridges, single-layer seals made of welding strips are used, which contain a fabric content of approx. 400 g / m² . Two layers are used for bridges operated by Deutsche Bahn, the first 5 mm thick, the second 4 mm thick.
In the 1970s, concrete began to be sealed on bridges, as the chloride contained in the road salt showed considerable damage to the concrete and concrete repairs were necessary.
literature
- vdd Industrieverband Bitumen-Dach- und Dichtungsbahnen eV (Hrsg.): Technical rules for the planning and execution of seals with polymer bitumen and bitumen sheeting . abc of the bitumen sheeting. 5th edition. vdd Industrieverband Bitumen-Dach- und Dichtungsbahnen eV, Frankfurt / Main 2012, ISBN 978-3-9801831-9-2 ( PDF + EPUB, 11.9 MB [accessed on November 19, 2014]).