SketchUp Extensions > Medeek Truss Plugin

Development and Updates for the Medeek Truss Plugin

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In order to better document the development of the Medeek Truss Plugin I have created this forum and topic.  Please feel free to post to this topic directly or start your own on related subjects.

I have the raised/energy heel working now for a fink truss where a vertical member and strut is required (heel height greater than 12" approx.).  Still working on the wedge and slider cases, they are actually easier to calculate and program, but I figured I would tackle the difficult one first.

When the angle between the strut and top chord exceeds 10 degrees I then apply a scarf cut to the strut at its centerline (try a raised heel height that exceeds 24" and you will notice the difference).

Here is an example of a fink truss with a 18" raised heel.  Notice there is no scarf cut at the top of the strut where it meets the top chord. 

For the fink truss all raised heel types are now active:

The algorithm is now smart enough to determine when to use a wedge, slider or vertical member with strut.  Depending on the heel height, and the pitch a wedge is either a 3.5" or 5.5" deep.  Likewise the slider is also auto selected to be either a 3.5" or 5.5" member.

I've also setup the plugin so it is now an .rbz file and can be installed from within SketchUp (preferences).

Another important change is the wrapping of the geometry creation portion of the script so that any changes to a model can be easily reversed with "undo"

I've had a number of requests for monopitch or monoslope trusses.  Shown below is a sample of potential configurations of this type of truss.  Has anyone ever seen a (5/3) or (6/4) or a (3/1) monopitch truss?  The first number is the number of top panels and the second number is the number of bottom panels to clarify.

Monopitch and Attic trusses are the next items I will tackle.

I've had a good bit of experience dealing with attic trusses in my own designs.  The big difference in configuration is the use of a piggyback where the truss height gets too tall for shipping.  I think it it would be cool to allow a user variable that enforces a max height and then draws a piggy back truss or the simpler configuration based on span, pitch and this max. truss height specified by the user:

Also with this type of truss I've noticed that the top chord section where no triangulation is present (diagonal ceiling) the truss depth is often inadequate for insulation.  Hence the need to split the top chord as shown in the first drawing with the overhanging portion 2x4 or 2x6 and the upper top chord 2x8 or deeper.

The piggyback is usually a small king post truss composed of 2x4 members all around.  The ceiling web of a piggyback is often 2x6 but I've seen 2x4 as well.

With more elaborate and longer spanning attic trusses I've even seen the bottom chord turned into an integrated floor truss where more depth is needed.

The simplest attic truss only involves six members:

Then to further increase the complications added a raised heel, typically not needed though since this type of truss is generally 8/12 pitch or higher.

If anyone has any other features or additional options that they would want to see included in an attic truss design please chime in.  This one really intrigues me, much more challenging than the common truss types.


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