# Towards multilayer walls in FreeCAD


I think I found a quite elegant solution for multilayer walls. It is by
no means a complete feature, but I think it gives us a very interesting
start on the topic.

Basically I added an "Offset" property to walls, so they can be
offsetted from their baseline. With this, several walls can be based on
the same baseline, resulting in a multilayer wall:

![](../../images/2013/freecad-multiwall1.jpg)

A window can be added as usual, drawn on one of the faces of any of the
"sibling" walls:

![](../../images/2013/freecad-multiwall2.jpg)

Upon creation, the window not only creates a hole in its base wall, but
also in all the sibling walls (= walls based on the same baseline)

![](../../images/2013/freecad-multiwall3.jpg)

There are of course different issues to solve later such as what happens
when a wall intersects a multi-wall, but for that we need more complete
materials support, because everything will be decided depending on the
material. I will also make the hole system better, allowing the user to
add a custom shape to define the hole, so one can do more complex things
such as having a different hole size for each of the layers of a
multilayer wall.