Adding falls to floors

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If in one of the rooms of your project you have to slope the floor to a gulley or drainage channel, this can be easily created using the floor modifier tools.  In this example i have used a concrete floor slab with screed laid to falls, this is a typical instance for a changing room or wet room (as shown below). 

• The first thing to do is select the element of your floor that you need to create the fall within (i.e. the screed). Select the floor and edit it’s type, click the edit structure box so the below appears.

•  Tick the box ‘variable’ for the element in which your want your falls created.

• If you look at the 3D view of your floor nothing has visibly changed. Select the floor and click ‘modify sub elements’ (Your slab must be flat with no predefined slopes for the 'modify sub elements' button to display).

• Click ‘add split line’, the slab will display all its modifiable edges and intersection points as shown below.

• Draw the shape you desire. I’ve chosen to draw a square where i will later add a gulley.

• You will now notice you have your shape as part of your floor

• Select your floor and pick one of the small boxes (aka. pull handles).

• This has now brought up a box to enter the amount of difference you want in the finish level. I’ve chosen a fall of 50mm so i entered a negative number (you could add a positive number if you want a high point).  If you want, you can also select a green edge line and it will act the same, allowing you to specify a height difference.

• Enter the figures for each point of your shape and you will notice additional lines on your floor, as it calculates and adds the falls. See below the finished floor.

• Your floor now has a fall within the screed layer (or finish you chose). None of the other elements have been modified. If you create a section you can see the falls have been created within the screed zone.

• This same method can be used for roofs, allowing you to create a flat roof, where the falls are created within the insulation layer.  The slab acts like any other slab, any you can host gully and drainage families in it without any problems.

Give it a try, and Happy editing!

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