# Layer Offsets at Openings

Multiple HRB types can be assigned to an opening, for example a window. Each HRB type has its own layer offsets and components. What happens to the layer offsets when multiple HRB types specify an offset for the same layer?

* The offsets are NOT added.
* The last offset is used.
  * HRB Type A has an offset of 0.1 m for the lintel of layer 0; HRB Type B (which follows Type A in the order) has an offset of 0.2 for the lintel of layer 0. The lintel bar is then positioned with a layer offset of 0.2.
  * An empty offset field does not override a previous offset; an offset of 0.0 overrides a previous offset, because 0.0 is also a value.
* All offsets from all HRB types are applied first, and only afterwards are the components generated.
  * Attention: When multiple HRB types exist, their order must be observed. Otherwise a component may be generated at an unintended position because the layer contour was shifted by another HRB type.
