Standards for bituminous membranes and rules for processing

Roof waterproofing on flat roofs is a tricky chapter, and many different types of bituminous membranes are used for sealing. Accordingly, there are many standards and regulations in this area. A short overview can be found here.

Aim of standards and processing rules

The sealing of the flat roof has the main task to prevent the ingress of any type of rainwater in the building. That's not so easy to do.

Depending on the roof structure and substructure, the seal must be adapted accordingly. Other local and structural conditions, such as the exact roof pitch, play a role in the planning of the correct sealing.

DIN 1107 and DIN 1108

DIN 1107 and DIN 1108 are important standards dealing with dimensional accuracy and dimensional stability of bituminous roofing.

DIN 1107-1 is the relevant part of bituminous roofing membranes, whereas in DIN 1107-2 the elastomeric membranes are treated in addition to the plastic membranes.

DIN 1108 deals exclusively with bituminous membranes.

DIN 1109 and DIN 1110

Other important categories are the cold bending behavior of different bituminous membranes, as well as the heat resistance. These two properties are the content of DIN 1109 and DIN 1110.

Method of artificial aging

DIN EN 1296 describes a European-wide standardized procedure for "artificial aging under continuous stress due to elevated temperature". It is aimed at all bitumen, elastomer and also plastic sheets.

In contrast, DIN EN 1297 describes an alternative process in which, in addition to elevated temperatures, UV radiation and water are also used.

Determination of dimensions according to the norm

How to correctly determine the length, width and straightness of a railway is specified in DIN EN 1848-1. This procedure is also valid throughout Europe. Rules for the determination of the thickness and the basis weight can be found in the following standard DIN EN 1849.

Determination of defects and other factors

When a bituminous membrane has defects, and how to determine visible damage, is regulated in the DIN EN 1850. But that is not the only standard that regulates the definition of technical properties:

  • the watertightness is determined according to DIN EN 1928
  • the water vapor permeability according to the specifications of DIN EN 1931
  • the so-called "caring liability" is regulated in DIN EN 12039
  • Tensile and expansion behavior according to DIN EN 12311
  • Peel and shear resistance of the joint seams according to DIN EN 12316 and DIN EN 12317
  • The DIN 12691 and the DIN 12730 are concerned with the resistance, on the one hand against jerky, on the other hand against static loads

Special standard for bare bituminous membranes

The standard DIN 52129 deals exclusively with bare bituminous membranes. It also lists all applicable requirements and terms regulated by the standard.

Basic processing standards

For the sealing of flat roofs DIN 18195 contains the basic processing and execution guidelines, further rules can be found in the so-called "flat roof rules" of the roofing trade. Another technical regulation also includes the "ABC of bituminous membranes", which is also considered a specialized rule. For general concerns also the DIN 18531 (structural waterproofing in general) is used mutatis mutandis.

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