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You already overlayed the reference drawing of roof but if you do not see the reference drawing;

  • Go to Roof Floor → Click Overlay

  • Select Xref drawing as Roof Linked Drawing

  • Click OK

Now you see roof floor plan.

Drawing Slab

  • Go to Slabs

  • Click Slab Edge

  • Draw 2 slab edges

Slab thickness is 8” at roof but we will draw slab pieces to assign different thickness to slab areas in slab edge as shown below.

  • Click Slab Piece

  • Draw slab pieces that are in slab edge

You can select slab pieces by right clicking and selecting in AutoCAD as shown above.

  • Enter the thickness of slab piece

  • Enter the clear cover values of slab piece

Do not forget to click update button to see changes on 3D view.

Drawing Openings

  • Go to Openings → Select Rectangular/Circular/Arbitrary

  • Draw opening

You must draw rotated rectangular openings by using arbitrary opening command as shown below.

You can use rectangular opening command only if opening dimensions are in x-y direction as shown below.

Drawing Columns

Arbitrary column that we draw on the upper roof continues on the roof. We can re-draw the column again or copy from upper roof. To copy the column from upper roof;

  • Go to Roof floor → Copy From

  • Select columns object to copy

  • Select Upper Roof as source story

  • Click Select Graphically

You can copy all objects that are selected from source story by clicking Copy All as shown above or if only some objects are the same you can select graphically from source story by clicking Select Graphically.

Objects to be copied from source story will be overlayed on drawing space.

  • Select column to copy

  • Hit Enter

You can select multiple objects before hitting enter.

  • Draw remaining columns below as explained before.

Drawing Shear Walls

Shear walls above continue below. We can copy them from upper roof.

  • Go to Roof Floor → Copy From

  • Select Shear walls object to copy

  • Select Upper Roof as source story

  • Click Copy All

  • Update the project

Shear wall opening size is not the same, we must draw shear wall opening.

  • Go to analytical wall which the opening will be drawn

  • Click Show in Elevation View

  • Click Wall Opening → Select Rectangle Shape

  • Draw the opening with the following size

Roof modelling is completed. 3D view of project is shown below.

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