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Truss Plugin/Extension

March 7, 2016, 2:16 am
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@medeek wrote:

Here is one way to frame an octagonal roof. The basic hip elements were first created with the plugin. This is a study of this type of roof to see what is required to add it into the plugin:

truss_su83_800.jpg800x600

truss_su84_800.jpg800x600

View model here:

https://3dwarehouse.sketchup.com/model.html?id=u27fa9eb4-683a-4d0e-b77c-17427a401b6b

Another method would be to use an 8 faceted center block. Dewalt's framing book goes into some alternative methods in some detail. I prefer the method I have shown above because it is much easier to extrapolate the framing method to include elongated octagonal roofs. 8 common rafters and 8 hip rafters come together at the peak, seems like it would be a real pain to try and fasten these at the peak, perhaps someone could enlighten me on how a carpenter would actually put this together.

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Truss Plugin/Extension

March 7, 2016, 2:42 am
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Truss Plugin/Extension

March 7, 2016, 4:25 am
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Truss Plugin/Extension

March 7, 2016, 8:56 am
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@gadget2020 wrote:

The true "octagonal" facet was popular 10 years ago; looks pretty, but is a waste of internal space. As a compromise, we now build a similar roof with a stretched front face (so that the proportions of the front are twice that of the corner facet) - this makes the roof pitch over the two corners a bit shallower. Still looks nice, but has a bit more usable internal space.
{... although in theory you could have two hips coming together 2/3 of the way up the roof and one hip from that point to the crest...}

The other variant on a theme is a dodecagon (120º angles rather than 135º)

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Truss Plugin/Extension

March 7, 2016, 1:05 pm
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Truss Plugin/Extension

March 8, 2016, 3:18 am
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@medeek wrote:

The question I would like to ask the SketchUp community is: Is this plugin something you need or would like to see? Is this plugin potentially useful to you as a SketchUp User?

If the answer is "no", then I have other ideas for plugins that I can divert my attention to.

If the answer is "yes", then I would like to continue developing this plugin and spend as much of my free time as possible to accelerate its development.

Here is the one question survey:

https://www.surveymonkey.com/r/59ZSZ8N

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Truss Plugin/Extension

March 10, 2016, 2:42 pm
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@medeek wrote:

Version 1.3.8 - 03.10.2016
- Added wireframe (temporary) graphics to the truss positioning tool.
- Added Boise Cascade BCI® I-joists: 4500, 5000, 6000, 6500, 60, 90.
- Rim joist option enabled for BCI floor joists.
- Removed drop down list for all overhang lengths (truss & rafter roofs). Overhangs are now users inserted values.

truss_su86_800.jpg800x600

The screenshot above shows the wireframe that is displayed for common truss types.

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Truss Plugin/Extension

March 11, 2016, 5:28 pm
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@medeek wrote:

A request by a potential user has got me thinking about Vulcraft (steel) and RedBuilt (steel and wood) open-web trusses for commercial applications. I noticed that on both of their websites they have either Revit models or Revit add-ins for generating their product geometry within Revit. I have contacted both companies about obtaining geometry for SketchUp. Does anyone have any other commercial truss products that they use on a regular basis?

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Truss Plugin/Extension

March 12, 2016, 3:34 am
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@medeek wrote:

This is a study of hip roof framing where unequal pitches meet at the hip (90 deg. to each other). In this case the birdsmouth cut is 3.5" for all jack and common rafters. The hip rafter is dropped and off center so that it lines up with the roof planes.

I assumed that the governing design criteria was that the sub-fascia line up hence the steeper pitch roof has a smaller overhang.

truss_su87_800.jpg800x600

View model here:

I haven't gone through and created the calculations yet for the plugin but the one thing that jumped out at me was the necessity to offset the hip rafter slightly from the hip centerline when a dropped hip rafter is employed. Please review the model and let me know if there are any problems with the way this comes together.

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Truss Plugin/Extension

March 12, 2016, 4:13 pm
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@medeek wrote:

Another study of hip roof framing where unequal pitches meet at the hip. The birdsmouth cut is 3.5" for all jack and common rafters. The hip rafter is dropped and off center so that it lines up with the roof planes. The hip roof combines a 12:12 pitch with a 6:12 pitch.

truss_su88_800.jpg800x600

View model here:

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Truss Plugin/Extension

March 14, 2016, 10:36 pm
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@medeek wrote:

Version 1.3.9 - 03.14.2016
- Out-to-out span of trusses in the trial version are now limited to a range of: 16 ft. (5m) - 32 ft. (9m).

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Truss Plugin/Extension

March 15, 2016, 5:59 pm
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@medeek wrote:

Version 1.4.0 - 03.15.2016
- Added LP Solidstart® I-joists: 450, 530, 18, 36, 56.
- Rim joist option enabled for LPI floor joists.

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Truss Plugin/Extension

March 17, 2016, 12:22 am
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Truss Plugin/Extension

March 17, 2016, 1:43 am
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@medeek wrote:

Coming up on the 6 month anniversary of the plugin (April 7). I'm pretty excited with the amount of work I've been able to do on it. I would really like to get to some more big items on the list like secondary roofs and dormers but that will take a few days of uninterrupted programming which is really hard to come by at the moment. Lately, I have been addressing mostly minor items that I can knock out in a a couple of hours. I usually don't start into a big project unless I think I can complete it in one go since it is really hard to partially complete it and then try to jump back into it at a later date. The higher the complexity the more this holds true.

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Truss Plugin/Extension

March 18, 2016, 4:38 am
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@medeek wrote:

I've been considering transition trusses and what it might take to add them into the plugin. Below is a quick study of this type of roof. I am curious to know if a common trusses is butted up next to a transition truss for sheathing purposes. Also notice the scissor transition, this situation is a little complicated, not exactly sure how to deal with it.

truss_su89_800.jpg800x600

View model here:

For clarity I have removed all of the common trusses in the image below:

truss_su91_800.jpg800x600

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Truss Plugin/Extension

March 18, 2016, 2:38 pm
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@medeek wrote:

This is a re-visit of the unequal pitch hip roof a few days back. Larry Belk, an experienced architect whose advice I highly regard, has suggested that an alternative way to handle this type of roof is to raise the top plate and thereby allow the overhang to remain constant around the roof:

truss_su90_800.jpg800x600

View model here:

Compare with hip roof 7:

truss_su88_800.jpg800x600

and model:

A few things pop out at me here.
First the raised top plate method allows the constant overhang with the continuous fascia, overall this is more aesthetically pleasing.
Second the hip rafter is no longer at the corner but is jogged in some amount onto the higher wall.
Third, the higher wall actually is protruding through the sheathing of the lower pitched roof in the model. Obviously the higher wall needs to be trimmed back some to deal with this.

For the plugin I think I will probably go with option 1 above initially but at some point it would be good to have a checkbox that allows one to choose either of these two options, the code is going to get ugly.

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Truss Plugin/Extension

March 19, 2016, 7:45 am
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@medeek wrote:

Version 1.4.2 - 03.19.2016
- Added energy/raised heels for attic trusses (1 variant: vertical w/ strut).
- Addressed some minor usability issues with the attic truss menu and options.

truss_su92_800.jpg800x600

View model here:

https://3dwarehouse.sketchup.com/model.html?id=u4f64fd8b-160f-49ce-815d-a66991527cdb

I've had quite a few people asking for this update so stayed up most of the night and knocked it out. Note, that the raised heel option is currently limited to attic trusses with a span of 24 ft. or greater. The reason for this is the way my logic currently works with spliced top chords. If this becomes an issue I will spend some more time on it to encompass attic trusses with a lesser span. I still do not have the gable truss, metric input or structural outlookers for this truss type, yet more items for the "todo" list.

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Truss Plugin/Extension

March 19, 2016, 8:27 pm
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@medeek wrote:

Thinking about dormers today and attic trusses:

View model here:

2-ply girder trusses on each side of the dormer with ladder framing between. I haven't bothered to show all of the main floor framing geometry (doors, windows, stairs etc...) My question is what would be the best route for the infill framing above the dormers.

1.) Ladder frame perpendicular to trusses.
2.) Install a ridgeboard hangered between the girder trusses and a lower header and install rafters parallel to the trusses?

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Truss Plugin/Extension

March 20, 2016, 12:40 pm
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@medeek wrote:

A basic algorithm to convert a common gable truss into a transition truss should not be to much problem. However, to make it handle all cases would become difficult if you include raised energy heels, drop top chords and scissor trusses in the mix. Consider the two examples below:

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Truss Plugin/Extension

March 20, 2016, 10:32 pm
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@medeek wrote:

Version 1.4.3 - 03.20.2016
- Added Scissor truss type, configuration: (6/6).
- Added energy/raised heels for scissor trusses (2 variants: wedge and vertical w/ strut).
- Addressed some minor usability issues with the scissor truss menu and options.

truss_su96_800.jpg800x600

View model here:

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