InSONArchitect, absorbent material can be added to walls, floors and ceilings of any enclosure. To do this, the following steps must be followed:
- Once inside the project and having drawn the outline of the building/retire under study, it should be clicked on the "Assign/View Materials" button.

- Select a database containing absorption materials. For example, "SONArchitect Database"
- Within the item type, select "Absorption":
- Then select the absorption element subtype:
- Select an absorption item from the list, select the item from the plane where you want to incorporate, press left mouse button on it, and press "Assign Material":