Revit Families: Yes/No Parameter Defaulting to No

When you add a Yes/No parameter in a Revit^® family, the initial default value is “Yes” – the box in the Value column is checked. If you only have one Type in your family at the time, it is easy enough to uncheck the box if you want it to be set to “No” and to have the value be “No” for any other Types created while that Type is current.

But there are occasions, such as for visibility parameters, where a family may get created, with multiple Types, and then later edited to add a new Type that requires a new Yes/No parameter that should only be turned on for the new Type. It is tedious to set each existing Type current and uncheck the newly added Yes/No parameter if there are more than two or three existing Types. Unfortunately, there is no way to specify the initial value for a newly added Yes/No parameter. Thanks to this post in the Who’s afraid of the Big Bad BIM? blog, I have worked out a way to quickly get all types set to “No”. I believe that what follows is the full…
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