Does Revit create commercial flat roofs?

[bowlingbrad]

I am trying (to no avail) to create a simple low-pitch 'flat' roof on a commercial building. I cannot find anywhere in the tutorials or the help files that talk about creating this type of roof.

I can get the basic -1/4" per foot define slope lines but, I cannot reproduce this roof plan (see attachment).

Per the jpeg:
HP2 is the highest point (only along the left edge). It slopes dn to the right to HP1.
HP1 is the main high point for the roof (second highest). It travels around the entire rest of the perimeter of the building.
LP is the location of the roof drain (2 locations).
IHP is the intermediate high point between HP1 and LP. This is usually an insulation cricket.

Most of you already know how do design roofs like the description above. Hopefully some of you can tell me how to accomplish it in Revit.

[zbubbas]

I suspect that someone will post a model of your roof very soon. I haven't found any thing buildable that Revit can't model. I have never tried this type of roof, however when I give it a try, I will seperate each roof plain into a seperate roof. Good luck. I am sure there is a better way though.

[beegee]

Brad,

Here is some reading for you, that should get you on track.

Low Slope Roofs (http://forums.augi.com/showthread.php?t=3357&highlight=flat+roof)



Sloped Insulation (http://forums.augi.com/showthread.php?t=2584&highlight=flat+roof)

[papurajx]

Split the roof into number of segments and use 'create roof' tool to draw the outline of individual segment as in your sketck without defining the slope and use 'slope arrow' (highest point to lowest point) to specify (right click 'slope arrow and select properties) the required slope/inclination and finally join all the roof segments together by 'join geometry'.

[bowlingbrad]

I'M GETTING CLOSER....

The roof slope arrow is doing the trick. I'm having a little trouble with the cricket. Any suggestions?

[Steve_Stafford]

I'M GETTING CLOSER....

The roof slope arrow is doing the trick. I'm having a little trouble with the cricket. Any suggestions?Do it like you build it...put a little roof on top...;)

[bclarch]

Try doing the cricket as a simple peaked roof then use join geometry to trim to shape.

[christo4robin]

To figure out the exact geometry of the cricket, draw a roof by footprint with a much larger boundary than the roof will actually have. Get it properly aligned (up down wise) in a section view. Use the join geometry tool (not join roofs) and join the cricket to the adjacent roofs. Now you have lines where the roofs intersect. Place reference planes or detail lines on the intersection lines. Now edit the sketch of the cricket and pick the reference planes/detail lines to be the boundary of the roof.

Voila!

[bowlingbrad]

Thanks to all of you for your help. I finally got it to work (and it doesn't take that long!).

Much appreciated
-Brad

Attached is a jpeg showing the completed roof.

Now I need to figure out how to best attach the structural joists. (?) As we all know, this type of graphical roof plan, with its ridges and vallies, is an approximation of a real-life 'warping' roof system. The deck actually warps and is bent to follow the steel joists/beams.

Thanks again.

[aprice56693]

This seems like a lot of work for little "payback". Of course you can do it, but you should be asking yourself why am I doing this? In our last Revit project we chose to model flat roofs as flat and add model lines to depict the roof crickets. We were working on a particularly large project and editing the lines was substantially easier than changing the model each time a modification to the drainage layout was made.

[aaronrumple]

I'd tend to agree, unless you really need to find high and low points of crickets. Model the major slopes so the structure can be located, but sketch the crickets.

[bowlingbrad]

sketch the crickets.
Even better solution! I tend to agree with modelling the major slopes and just sketching in the crickets.

Is there any talk in the 'halls of Revitdome' regarding an upgrade of the roof tool to accommodate the 'flat-roofers' out here?