> For the complete documentation index, see [llms.txt](https://help.qonic.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.qonic.com/documentation/qonic-application/modelling/modifying/material-layer-editing.md).

# Material Layer Editing

Edit the material layers of walls, slabs and roofs: split them into layers, strip or replace layers, add new layers and flip the layer order.

Use these tools to edit the material layers of walls, slabs and roofs.

## Split into Layers

Split a wall, slab or roof with an underlying material structure to access the individual layers of materials.

{% embed url="<https://qonic.wistia.com/medias/pu2e21vzmx>" %}

1. Under the *Detail* icon, click *Split into Layers*
2. Select one or more walls, roofs or slabs, and press Enter
3. (optional) click the preview to flip the layer structure before splitting.\
   **Note:** if several adjacent walls with the same layer structure are detected, the preview will combine them so you can easily flip a set of walls together instead of individually.
4. Click *Apply* or press *Enter*

## Strip to Layer

Remove all but one material layer of a wall, slab or roof.

{% embed url="<https://qonic.wistia.com/medias/f7a6ho8md2>" %}

1. Under the *Detail* icon, click *Strip to Layer*
2. Select one or more walls, slabs or roofs. Make sure all selected parts have at least one material in common, and this material does not occur more than once in one product. If the product has an internal layer structure, you will need to use [Split into Layers](#split-into-layers) first for this tool to work
3. Choose the material you want to keep
4. Click *Apply* or press *Enter*

## Replace with Layer

{% embed url="<https://qonic.wistia.com/medias/440nf92aqd>" %}

Use this tool to apply a new material and change the thickness of a wall, slab or roof. If your wall, slab or roof will consist of multiple material layers, choose one to be the ‘core’ layer. Typically this will be the structural layer, e.g. bricks in a cavity wall or studs in a stud wall.

1. Under the *Detail* icon, click *Replace with Layer*
2. Select one or more walls, roofs or slabs
3. Choose a material. Your [project material libraries](/documentation/qonic-dashboard/libraries/material-libraries.md) will be displayed here, as well as the materials already in the currently open model.
4. Enter a thickness
5. (optional) Click 'show preview'. The selected walls will now become transparent, and a preview of the new material will be visible on top of it. Hovering the cursor over this preview will highlight it in blue. Left-click the highlighted preview to change the alignment if the thickness has changed.\
   **Note:** previews of adjacent walls will be grouped together so that you can change the alignment of multiple walls at the same time.
6. Click *Apply* or press *Enter*

The new material and thickness will now be applied to the selected building elements.

## Add Layer

{% embed url="<https://qonic.wistia.com/medias/kvh3vz8wy7>" %}

This tool allows you to easily add new material layers such as insulation layers, wall or floor finishes to existing building elements. Note that building elements with an internal layer structure need to be split first before being able to add new layers. Use the [Split Into Layers](#split-into-layers) tool for this.

1. Under the *Detail* icon, click *Add Layer*
2. Choose a material. Your [project material libraries](/documentation/qonic-dashboard/libraries/material-libraries.md) will be displayed here, as well as the materials already in the currently open model
3. Enter a thickness
4. (Optional) enable the ‘Flow through openings’ setting. A use case for this setting is when adding a layer to a floor slab and there is a door opening between two rooms. When this setting enabled, the newly added layer in one room will flow through the door opening so that the new layer is also added to the second room. Disable this setting if you want two different floor finishes in the two rooms.
5. Click on a product to add the chosen layer. Works best on planar objects like walls, slabs and roofs. Curved surfaces such as cylindrical or spline surfaces are also supported.
6. (Optional) after adding a layer to one wall in a room, the option will appear to apply this same layer to the rest of the room. If you choose to apply this, the next layer you add will automatically be added to the entire room.

The layers that you add will become part of the existing building element, while still allowing you to edit them individually.

It is possible to add a layer to multiple coplanar walls or slabs at once. The layers will then automatically be split up into individual parts belonging to their respective walls or slabs.

## Flip Layers

{% embed url="<https://qonic.wistia.com/medias/5nzus8c3th>" %}

To flip the layer order of a wall, slab or roof:

1. Under the *Detail* icon, click *Flip Layers*
2. Click the wall, slab or roof you wish to flip\
   **Note:** You may first have to split the wall, slab or roof into its respective parts. Use the [Split Into Layers](#split-into-layers) tool for this.