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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.
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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Walls heights are controlled by a combination of the wall bounding and the offsets from the top and bottom bounds. The way to deal with the height of a wall is to choose the Top Bound and the Bottom Bound, then enter the offsets from each bound. If you want a very simple way to set the height of the wall, set both the top and bottom bounds to Layer Elevation and then enter the offsets for each.
The Floor object has a fixed bounding. There is the underside of the floor and the floor’s thickness. If you want your slab top to finish at zero, then the bottom offset has to be the negative value of the thickness. For slab objects, you can choose whether the elevation of the slab is measured to the top or bottom of the slab.
Roofs are controlled by a combination of the roof bearing height and the layer elevation. The easiest way to deal with your roof bearing height is to set your Layer Elevation to the same elevation as the layer of the walls supporting the roof. This allows you to measure the bearing height of the roof from the floor slab.
Walls can have components. The components represent a part of the wall, the exterior cladding for example. These components can have their own color, line weight, texture, and class. This allows you to have parts of the wall visible in some drawings and not visible in others. As well as creating wall components, you can save your wall settings as a Wall Style that can be saved to your library and used on multiple projects.
Slabs can have components. The components represent a part of the slab, the slab topping for example. These components can have their own color, line weight, texture, and class. This allows you to have parts of the slab visible in some drawings and not visible in others and to control the extent of each component . As well as creating components, you can save your Slab settings as a Slab Style that can be saved to your library and used on multiple projects.
Roofs can have components. The components represent a part of the wall, the exterior cladding for example. These components can have their own color, line weight, texture, and class. This allows you to have parts of the roof visible in some drawings and not visible in others. As well as creating components, you can save your settings as a Roof Style that can be saved to your library and used on multiple projects.
When the wall components and slab components have been correctly created, they can be used to interact with each other.
For example, you can create a brick veneer wall that will connect correctly with a corresponding slab to create the set downs in the slab for the brick veneer. Slabs can be connected to walls so that when the walls are amended, the slabs update automatically.
When the wall components and roof components have been correctly created, they can be used to interact with each other. For example, you can create roof components that stop at the interface of wall components. An example might be a roof where the rafters stop at the wall line but the purlins extend to the outside of the roof, or ceilings that stop on the internal lining of the wall.
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You really skip over these topics really quickly. I have repeated the videos several times, but still have trouble following your method and techniques.
Maybe it would be a good idea to book for the Architect Special interest group so that we can explore these in more detail.
These might help:
Connecting Walls and Slabs