SST_1708 – Walls, Slabs, And Roofs



Walls, slabs, and roofs are designed to interact. This means that when you connect a slab to walls, it will update when you move the walls. Roofs can be connected to walls so that parts of the roof are inside the building and some parts of the roof extend out to the eaves.

In order to make these connections, we need to understand how walls, slabs, and roofs connect. We need to understand how the walls have been designed, how the slabs have been designed, and how the roofs have been designed.

The manual has been divided into three parts. The first part looks at the basic concepts of walls, roofs, and slabs. The second part looks at these elements in detail and shows how the components for these objects work. The final part of the manual looks at how these objects interact with each other.



When we start looking at walls, it is important for us to understand how the top and the bottom of the wall are controlled. Controlling the top bound and the bottom bound seems to be the first hurdle for people learning to use walls. The bottom of the wall is controlled by a level called Bottom Bound. This level can be the layer elevation. If you are using Stories, this bottom bound can be a story level, allowing you to set the bounding of the wall to any level you require.

Walls can have components. These components can represent parts of a wall such as cladding, cavities, framing, lining, etc. The components can be connected to the wall height or they can be connected to story levels.

Slabs and Floors

The Floor object is used for drawing simple slabs and other horizontal objects. The Floor object is set out from the underside (bottom Z) and has a thickness. A slab can be set out from the top or the bottom of the slab (the datum). A slab can also be created with components, and any one of these components can be used for the datum of the slab.


The bearing height of the roof controls the elevation to the start of the roof. The bearing height is normally measured from where the roof and the wall touch. The bearing height is measured in the current layer, in some cases the roof bearing height has to be changed in order to accommodate the layer elevation. I generally set my roof layer to have the same elevation as the layer for the walls supporting the roof. You can have a series of components that represent parts of the roof, such as cladding, purlins, rafters, ceilings, etc.

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2 thoughts on “SST_1708 – Walls, Slabs, And Roofs

  1. You really skip over these topics really quickly. I have repeated the videos several times, but still have trouble following your method and techniques.

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