Roof head height align

[Joris.vd.Meulen]

Question:

I created a roof using the "roof by roofprint". No problem.
Next I created in the same roofprint a "hip roof" (I believe it's called that way...) using the slope arrows.

Roof generated as wished for - almost.

Problem: the hip roof's head is heigher than the gable roof.
Solution I use at the moment: set the slope arrows > element properties > headheight to a certain value.
Bad part is that this value has absolutely no relation to the head of the gable roof.

What I want is the hip roof to be aligned with the gable roof.

How do you do this?

(See attachement for a visualisation of my question).

[vector2]

just lower the pitch of the dormer roof..

[Joris.vd.Meulen]

Well,


I define a base (tail of the slopearrow) and a head.
The head should align with the gable roof.

So lowering a pitch-value is still guessing / trail-and-error... right?
(no align possibilities? etc)

Could you tell me have to achieve this?

3Pinter

[vector2]

same slope on both roofs..

just food for thought..

roof geometry is a blast..

[Joris.vd.Meulen]

Yeah if only that's what the architect wants...

The hip-roof has a different slope. Further more: I don't care about the slope since I want to define a base starting point and a align with a different roof.

My food for thought...


3Pinter

[Anonymous]

To get them to match exactly you can use the measure tool from an elevation
to find the ridge height of the main roof. Then use this ridge hight in the
definition of the slope arrows. There is no automatic way to align the 2
roof ridge lines. You have to know the math or find the point manually.

--
Jeff Hanson
SME (Subject Matter Expert)
Autodesk - BIM UX
Manchester, NH


wrote in message news:6378996@discussion.autodesk.com...
Well,


I define a base (tail of the slopearrow) and a head.
The head should align with the gable roof.

So lowering a pitch-value is still guessing / trail-and-error... right?
(no align possibilities? etc)

Could you tell me have to achieve this?

3Pinter

[Anonymous]

The first question I would ask is: Are the spans and pitches EXACTLY THE
SAME. If either are not, then you'll have to do as Jeff suggested, and
modify the pitch mathmatically.

Mike
wrote in message news:6379035@discussion.autodesk.com...
Yeah if only that's what the architect wants...

The hip-roof has a different slope. Further more: I don't care about the
slope since I want to define a base starting point and a align with a
different roof.

My food for thought...


3Pinter

[Anonymous]

On Fri, 23 Apr 2010 03:49:08 -0700, vector2 <> wrote:

>same slope on both roofs..

The same slope condition which results in cooinidental ridge lines ONLY works if
the width of the main building and the gable end are exactly the same.

>roof geometry is a blast..

Well, IF you understand the basic math involved, yes, it can be.

Matt
matt@stachoni.com

[Anonymous]

On Fri, 23 Apr 2010 09:24:41 -0700, Mike Maloney
wrote:

>The first question I would ask is: Are the spans and pitches EXACTLY THE
>SAME. If either are not, then you'll have to do as Jeff suggested, and
>modify the pitch mathmatically.

My question is: Does it matter? Is it critical for the ridge of the front
portion to hit the ridge of the main portion exactly?

Taking constructability into account, if you do try to hit this point exactly,
you are going to get a hump in the roofing material which isn't going to look
right, and possibly have issues with weathering as well. Properly flashing that
pointed condition to be leakproof could be a problem.

I would suggest lowering the gable end roof pitch to a somewhat common number
(so the framers can deal with it easily enough without taking a math degree from
Stanford) and miss the upper ridge altogether.

Matt
matt@stachoni.com

[Robert_Grandmaison]

I would edit the footprint, and place three reference planes in the plan view of the roof. Make sure to locate the inner plane exactly where you want the ridge of the dormer to be and then use the pick/offset tool to create the other two planes exactly half the width of the main roof - from eave to ridge. Dimension it and use the EQ tool just to make sure your distances are correct. Lock the dimensions to the reference planes (the overall and the ridge/valley ends half distances).

Split the eave where the dormer is to occur.

Place slope arrows with the "slope" option to match your main roof pitch. (You can even Dim/Aligned/EQ the slope arrowheads so they don't get left behind in the step below!)

Align/Lock the endpoints of the of the split lines at the valley ends to the reference planes.

Finish your roof.

The nice thing about working this way is it ensures you've got the exact width for your dormer to match precisely the width of your main roof AND if you go back into Edit Footprint on the roof you should now be able to drag the ridge line and have your valleys for the roof move too.

See attached file if you're so inclined....

[Robert_Grandmaison]

Oh, for proof here's the 3D view of that same roof above.

(Sure wish you could add multiple attachments to messages here!)

[Robert_Grandmaison]

Ah, if you want different slopes, then use the Roof By Extrusion option. Switch to the "front" view on your gable dormer and pick the main roof fascia as the sketch plane, then using just two lines, draw the top of the roof, snapping to the ridge of the main roof- angle dimension/constrain/construct pitch as needed. Mirror the line about the endpoint on the ridge and finish the sketch/roof. Now, use the Roof Join tool to push the new gable back atop the main roof and join the two. Ridges and valley ends align at elevations perfectly- very different pitches on roofs.

[Robert_Grandmaison]

Same thing...but plumb cut on fascia- and a roof void added to clip the corners on the gable dormer where they extend below the main roof fascia.

[Alfredo_Medina]

Perfect! Your approach, using EQ constrains to reference planes is very accurate. I had attempted to do this by doing a 2D sketch first, to get the required distances and angles, but then when I did my roof and looked at it in 3D, there was a minor gap, very small, between the main ridge and the dormers' ridge; so I thought that maybe I needed more decimal places in my distances and angles, but now I see that your approach makes more sense in order to get this to work perfectly.

[vector2]

this is good stuff..