Expansion
Expansion sleeves are necessary to absorb the expansion and contraction of the roof gutter.
An expansion device must always be supported by a bracket.
In practice we distinguish between two types of expansion pieces, mechanical expansion
(see figure 3.1.10) and rubber expansion (see figure 3.1.11).
![](https://www.nedzink.com/wp-content/uploads/2019/06/7.27-1.jpg)
A mechanical expansion has an expansion joint and a separation slide on the left and right.
![](https://www.nedzink.com/wp-content/uploads/2019/06/7.28.jpg)
A rubber expansion is fitted with a rubber galvanised expansion piece and a zinc beaded edge.
![](https://www.nedzink.com/wp-content/uploads/2019/06/7.29.jpg)