Forums >> Revit Building >> Technical Support >> Roof not showing all layers of sructure in some sections

spacey

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Revit 2017

I have a roof with a structure of multiple layers, which has been showing fine in sections until recently. No change has been made to the roof. The recent changes to the file have been a fascia profile altered slightly and callouts annotated.

Now some sections through the roof show the layers of the structure correctly, but some sections do not, and what is more confusing, some sections show it correctly in part and incorrectly in pther parts.

See attached image with clips from 3 sections, the double circled areas have the correct layers showing. It is all one roof.

Any suggestions as to the cause of this?

Thanks.

Edited on: Wed, Sep 6, 2017 at 5:00:14 PM

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WWHub

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From what I see, it looks correct.   What you are complaining about (I think) is simply the hatch pattern for your insulation.  

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spacey

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Hi,

Thanks for your reply.

No, the displayed hatching is not correct. 

If you look at the circled areas, you will see  differences between those double circled and those single circled.

However, this is one roof, and all sections have the same scale, detail level, and other settings. All sections should show the same. One even shows the same roof differently within the one section.

The roof has multiple layers in its structure, one of which is hatched to represent insulation.

In the areas indicated by the double circles, it is correctly shown with this hatch in a thinner layer with several thin unhatched ayers over it representing cladding, ventilation space,  structure.

In the areas indicated by the single circle, this hatch incorrectly extends to the upper surface of the roof, covering the upper layers.

For example, the top left section shows this incorrect hatching on the area of roof to the right of the chimney, but in the same section, of the same roof element, the hatching is shown correctly on the left side.

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WWHub

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The image on the right and bottom are correct.   The line you see that you think is a layer is the horizontal line in the hatch pattern!  Draw a filled region using a modle hatch pattern like this and you can learn how to adjust where that line is.  Drafting patterns can not be adjusted but model patterns can.

The image on the left is something else.

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spacey

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 I will try to explain this more clearly.

The roof structure has the following layers:240 rafter

50 insulation 

45 purlin

20 air space

20 cladding steel

In the attached clip I have iadded another roof of the same type below, which is displaying ccorrectly, and I have dimensioned where possible, the layers. (See 2. below for comment on the dimensioning)

I have changed the hatching on the outer 2 layers to distinguish them from layer boundaries/edges, and show more clearly that lines are definitely not hatching lines, they are layer edges.

The part of the roof showing to the right of the chimney is not displaying correctly, as the insulation layer hatch is covering over all the upper layers. 

It is the very same roof as that on the left of this section - not just the same type, it is part of the same roof boundary, so for it to be displaying differently is weird.

2.

Another weird thing is that I cannot dimension to the boundary between the air space and purlin. This may be a related or unrelated fault. 

In the screen capture I am editing the witness lines of the dimension to that bottom roof, trying to select that boundary. Ther cursor doesn't show, but it is hovering over one of those boundaries, but ihoefully you can see that both the outer and inner edges of the layer are highlighted, instead of the usual, one edge highlighted when selecting for dimensioning.

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WWHub

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OK... This is the upper left image in your first post where I did say it was different.

I'm lost as to what is what.  Are there two roofs here or what?

The lower part of the image appears to be the same side to side.   But something going on here that doesn't agree with what you posted.  The are on the right is blue which means you picked this but there is only one blue line on the left.  These are not all one 'roof'.

I don't understand the upper area at all and none of that is blue so these are not all one roof.

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spacey

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Yes there are two roofs in that image. I copied the original downwards,creating the lower roofs in the image, and each of these two roofs has two mirrored 45º sloping faces.

The upper roof has a hole for a chimney in it, which is cut by this section. It is displaying the layers differently each side of the hole, despite being one roof.

On the lower roof,  the thicker blue lines are for witness line selection so don't show over the whole element, just (usually) one edge, unlike general selection.

Strangely, though, the boundary for one of the layers cannot be selected for dimensioning, and you will see in the image, hovering for dimensioning has highlighted two sides of that one layer, at the same time, and the dimension snaps to the outside of the next layer, hence a value of 65 not 45 and 20.

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blue442

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I had this happen to a wall with a fire extinguisher cabinet.

I never figured out what was going on with it.  I just made it a dumb detail item and moved on.

but it's the opening in the top interacting with the roof that is causing the problem.

as seen in your first few pictures when there is no opening, the roof behaves correctly.

have you tried cutting a hole manually instead of using a family to cut the hole?

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spacey

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Thanks for your reply and the suggestion.

The cutout is actually created by the roof boundary having a recess, rather than a family, because the chimney is a one off constructed of framed walls around a flue so I didn't use a family, and the cutout is at the edge, with roof on 3 rather than 4 sides.

I unfortunately I have several sections and details affected so it would mean "patching" quite a few drawings.

It seemed fixed temporarily when I recreated the roof, but  the issue came back.

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spacey

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I have copied the roof and chimney framing and this is how it displays in a new Prooject file  - correctly showing the layers:

I have deleted the end wall for clarity

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blue442

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Is this perhaps a wall join issue?

I'm not sure why this is happening.

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spacey

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It turned out to be an issue with a fascia that had a rearward projection (into the roof) in the profile. Unjoining this got rid of the display problem

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