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Mon, Mar 24, 2008 at 7:35:46 PM | Flat roof with crickets

#1

utearch1


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I am using Revit 2008, and have the following problem/question. If I have a flat membrane roof system following the slope of the joists, how can I draw in crickets to the drain areas. Right now I have the roof sloping from the high side to the low side. Is there a way to design in crickets to show the slope to those spots. i was hoping the new variable layer would work, but that only works if the roof is flat. In the past I have just drawn the lines in to show the crickets. It would be nice to be able to model this if possible.

 Let me know if you have found a way.

 Thanks


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Thu, Jun 5, 2008 at 4:59:13 PM | Flat roof with crickets

#2

notagain


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I am looking for the same thing...any takers

-----------------------------------

I really want this to work...some good things some bad

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Thu, Jun 5, 2008 at 7:33:37 PM | Flat roof with crickets

#3

ArchWestCY


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I have a way of doing this, that is almost perfect.  Very few people have noticed the slight imperfection.  See what you think.

 

Cut a section from the high side to the low side.  In that section create a Referance Plane along the top of the roof, follow the slope. (Hint: use the Picker to select the top line of the roof, rather than drawing the Plane with the pencil tool)  Name the Referance Plane so that it is easy to find later.

Go to a 3D view, and use the Orient > by Plane command under the View menu.  Choose the plane in the Name box.

Set the Work plane to your new Referance Plane.

Now, activate the Create... tool from the Modeling menu.  I usually call it a Roof, so that it dissappeares when you hide Roofs by Catagory.  Start the Solid Form > Solid Revolve tool.  Draw the Cricket on the Roof.  Use the hypotinose as the Axis of rotation and set the rotation to go from (Start Angle - End Angle) 0 to 1.19 degrees (1/4" / 1' slope).  To make the Cricket steeper you should add to the rotation. 

Finish Sketch

The only problem with this is that the edge of your cricket in the corner is slightly rounder (you did use the revolve tool).  It is hardly noticable, and when you cut your section and print it no one will know the differance.

I usually set the Material to match the roof membrane and the Cut Pattern to match your Rigid Insulation.

 

That is how I do it.  It looks great, and renders great.  Try it out and let me know what you think.

 


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ArchWestCY

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Fri, Jun 6, 2008 at 6:25:56 AM | Flat roof with crickets

#4

Mr Spot


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A screenshot would be helpful, as personally I tried to avoid in-place families if possible and to me it sounds like in this case it is most likely possible...

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Chris.

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Mon, Jun 9, 2008 at 8:42:38 PM | Flat roof with crickets

#5

AnnwnMist


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I create a second roof by footprint over the flat roof and use split lines and point elevations to create the slopes I need. Then use join geometry to join the insulation layer and, if the cricket insulation layer is variable thickness, the membrane will continue over both and look just fine in section.

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Mon, Jun 9, 2008 at 8:50:45 PM | Flat roof with crickets

#6

ArchWestCY


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Sorry it took me so long to get back to this thread.  I did go ahead and create a Generic Model - Roof Based of the Cricket that I discribed above.  You can load it, drop it into place, resize the X and Y legs, adjust the angle of rotation, and select the material for it.  I tried to make invisible detail lines that show which leg is X and which is Y but they wouldn't show up for some reason.  Also, if you look closely at the Crickets properties you may notice that it would only rotate correctly as a negative angle, so I fixed it with a formula, not a big deal but a little wierd.  If anyone has an answer to these problems that I have mentioed, please reply.   Enjoy this easy to use cricket.  Remember, for a material I would give a Cut Pattern of rigid insulation and a Surface Pattern of none.  the rendering material should match your roof membrane.

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ArchWestCY

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