The roof has many parts, but the layman does not know all the names. So it is with the verge. Since attention has to be paid to the energy efficiency of a house, this roof detail has become more important.
Location and importance of the verge
The front side of the roof structure is called the verge. It runs on both halves of the roof from the eaves overhang to the ridge. At the verge, the roof structure, roof skin and gable meet. Since these different materials have to be connected in such a way that no moisture can penetrate, the verge is a particularly problematic detail of the roof.
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The verge is covered so that the different expansion of the materials that come together does not create gaps through which air and moisture can find their way. There are special angle plates in different colors, but also wood or bricks (so-called. Verge stones) are possible for the cladding. While wood and sheet metal tend to emphasize the verge optically, the verge stones optically integrate it into the roof.
Verge and energy consumption
The verge actually doesn't have much to do with energy consumption, other than the fact that the roof should be tight and insulated. It only becomes important when it comes to facade insulation. For several years now, the Energy Saving Ordinance (EnEV) has stipulated that the facade of old buildings must be insulated if you replace more than 10% of the facade area in the course of renovation work.
For some owners of old buildings, this means that they have to consider which type of facade insulation they want to install. The most effective variant is external insulation. However, depending on the type of wall, insulation material and plaster, the outer wall is between 10 cm and 20 cm thicker (especially alternative insulation material such as wood fiber or cellulose apply). In some cases, the verge therefore has to be extended.
Extension of the verge
To extend the verge, you need to expose up to three rafters and extend the purlins and battens for the bricks. This is associated with costs and work. It is important to ensure that the extension does not have too much weight (because the roof structure was originally designed differently, this could affect the statics).