Forums >> Revit Building >> Technical Support >> Roof Design Problem

lobby

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Joined: Mon, Dec 7, 2009
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Having a roof design problem.  I have a large home designed in Autocad from the draftsman, who assures me the design is correct.

Attached is an image of the autocad roof outline, and an image of the roof in Revit.  The problem is circled in red, which is causing the roof not to line up properly.

Roof pitch is 15.00°.  Front porch part of roof is raised.

Does anyone know how to fix this issue?

Attached Images

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mansell5

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Joined: Sun, Jun 14, 2009
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gday, i would say raised portico and the triangle section behind are the same pitch.

but they are different (steeper) than the 15 deg the rest is on, being  approx 21deg.

if all the roof was on same pitch or slope, the hip lines at the triangle section would bisect the angle.

so as drawn its not correct if all roofs are 15 deg.

cheers

geoffm

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lobby

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Joined: Mon, Dec 7, 2009
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Thanks geoffm,

Thats makes a bit more sense.  I changed the triangle section behind the portico roof to 21 deg.  It is very close to the  autocad drawing.  Is there a method to get it spot on, or is it just trial and error from here?

Cheers

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mansell5

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Joined: Sun, Jun 14, 2009
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the little portico roof would also need to be same pitch as the "triangle" behind it.

as far as getting it to match the autocad file, either trial and error, or

draw a horizontal line representing hip length (not the slope) ,

draw a line starting at one end at 15 deg slope (so you form an open triangle) ending vertically above end of first line.

along the first horizontal line you drew, draw another line equal to the horizontal distance

from fascia of triangular roof (as per your diagram) to hip apex point, then project up vertically, to level with top of inclined line.

then, draw a line from this point back down to the start point.

this should give you the slope. 

in other words the small triangula roof  rises the same ht as the 15 deg main roof , but over a shorter distance, therefore steeper.

hope it makes sense.

cheers

geoffm

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