Tuesday, 18 September 2012

Revit curtain wall Mullions

This blog is a continuation of:

Curtain wall mullions are made of profiles. I always say during trainings that if you can create good profiles in Revit you have made a big step in modelling.

First you have several different mullions for different situations. This blog will focus on the Rectangular Mullion first.

Curtain Wall Mullions
Circular Mullion
L Corner Mullion
Quad Corner Mullion
Rectangular Mullion
Trapezoid Corner Mullion
V Corner Mullion

Be aware that a mullion is a system family!

Type properties of a rectangular mullion
  1. Profile - if you leave this to default the you can set the value of 2 and 3
  2. thickness is measured from the location line of the curtain wall and equal on both sides. This means that when you draw a cw that mullion is 75 mm thick on one side and 75mm on the other. 
  3. Here you control the width of the mullion and whether it is symmetrical. The total width for this one is 50mm
Personally I only use this default profile if I create interior curtain walls. If I need an exterior curtain wall I want a profile that is completely at the outside of the curtain wall. I do this for the following reason. Often an exterion curtain wall runs in front of a floor edge. If I change the mullion size thickness to a greater value I do not want the mullion to go suddenly through my floor.

How to create your own mullion?
  • Mullion creation rules: you may only put one closed loop into a profile
  • Model only the exterior lines
  • Keep it simpel
  • Keep the amount of line segments in the loop to the bare minimum
  • Do not draw lines on top of each other (it's not autocad)
  • If you need more detail add a detail component
goto Revit --> new --> family --> Metric Profile-Mullion.rft
This template is nice because it tells you where is the outside of the curtain wall.
Next create the following reference planes dimensions, parameters and family type.
Draw a rectangle over the reference planes. In this family you do not need to lock the lines. Revit has a system build in that is called assumed relations. Basically this means that when you draw something to coincide with something else that this can not be a coincidence and you will probably want this to keep coinciding. Sometimes this is nicknamed the feminine side of Revit...
Load into project, since I don't save this file it will come into my project named: family#:60x180mm uder the profiles in the project browser. I will rename this family to Rectangle_outside:60x180mm
(left of the : is the family name and at the right side is the type name)
For profiles I tend to name them according to their shape and purpose / location. (feel free to use your own)
Next create a new type under rectangular mullion.  I tend to give the mullion name the same name as the type name of the profile I am going to use. So in this case I call the mullion 60x180mm
Go to the type properties of the mullion you have just created. (right click it)
Select the profile you have created. All the other parameters should make sense to you. If they don't, change them and watch the result.

Now that you have created your own mullion from your self made profile it's time to use this mullion in a curtain wall.
This will make the curtain wall look like this. (this is the lower left corner of the cw)

Example of different use of a curtain wall
The trick is in the profile
 Use this trick for the length of wall, notice the center and pattern offset
   If you change the wall by the cutprofile. Notice the result.
 Openings also behave slightly different
This is the profile and here you can see where the 1240 and the 620 comes from.

Go to this blog: (link will follow later) for how you add a detail component to a profile to see the all the the lines of a typical aluminium mullion

Google+ Badge