topic Re: Roof and rafter in Modeling

Roof and rafter

Anonymous — Tue, 23 May 2023 12:20:50 GMT

Hi,

Can someone explain how to cut out the roof this hole? (the second roof section)
Eaves and roof at the ends do not come insulation, how to solve it?
Eaves end is this rafters like in picture. how it's made?
I hope anybody could understand what I thinking.

Best regards,
Jaano

Re: Roof and rafter

Gerald Hoffman — Wed, 24 Aug 2016 02:09:27 GMT

Janno,

You can use SEO with a slab deep enough to subtract all of the roof you want. You will want to make it wide enough to allow your walls to come through. Just subtract the roof from the slab with SEO.

On the rafter I would create the shape of the rafter tail from the outside of the wall face with a custom Profile with the shape you want and place on the end of each rafter that has insulation.

I hope this is clear. There are Youtube videos on using the Profile tool if you are not sure.

Cheers,

Re: Roof and rafter

Barry Kelly — Wed, 24 Aug 2016 03:59:55 GMT

For rafter tails see here ...

http://helpcenter.graphisoft.com/tips/archicad/modelling/creative-uses-of-complex-profiles/?redirect=archicadwiki#Rafter_Tails

Barry.

Re: Roof and rafter

Steve Jepson — Mon, 05 Sep 2016 18:11:23 GMT

nojaano wrote:
Hi,

Can someone explain how to cut out the roof this hole? (the second roof section)
Eaves and roof at the ends do not come insulation, how to solve it?
Eaves end is this rafters like in picture. how it's made?
I hope anybody could understand what I thinking.

Best regards,
Jaano

The way you model anything in ArchiCAD depends very much on what you need it for.

I almost always model the roof sheathing as a single element rather than as a Complex Profile for Composite.

How to cut out the roof where another roof meets it perpendicular?
Stretch some new nodes from the edge of the roof you want to cut, to about where the intersect is going to be, Select one roof and then use Ctrl-Click on the edge of the other roof to make the roofs intersect in the correct place.
You will find many uses for using roofs and Ctrl-Click to make the intersect.
I use roofs this way as SEO's in my excavation/site terrain models. I model soffits as roofs with 0 slope, sidewalks, garage slabs, etc... lots of things. Ctrl-Click with things modeled as roofs is an important ArchiCAD skill to learn. That is how you make the cutout in the roof I think you are after.

I could post a little video clip if you would find it useful. ?

Re: Roof and rafter

Anonymous — Mon, 05 Sep 2016 21:21:59 GMT

Steve wrote:
nojaano wrote:
Hi,

Can someone explain how to cut out the roof this hole? (the second roof section)
Eaves and roof at the ends do not come insulation, how to solve it?
Eaves end is this rafters like in picture. how it's made?
I hope anybody could understand what I thinking.

Best regards,
Jaano
The way you model anything in ArchiCAD depends very much on what you need it for.

I almost always model the roof sheathing as a single element rather than as a Complex Profile for Composite.

How to cut out the roof where another roof meets it perpendicular?
Stretch some new nodes from the edge of the roof you want to cut, to about where the intersect is going to be, Select one roof and then use Ctrl-Click on the edge of the other roof to make the roofs intersect in the correct place.
You will find many uses for using roofs and Ctrl-Click to make the intersect.
I use roofs this way as SEO's in my excavation/site terrain models. I model soffits as roofs with 0 slope, sidewalks, garage slabs, etc... lots of things. Ctrl-Click with things modeled as roofs is an important ArchiCAD skill to learn. That is how you make the cutout in the roof I think you are after.

I could post a little video clip if you would find it useful. ?

I would like to see the Ctrl + click intersection, I have never made it before, or if you can point me to any GS video that shows this,
Thanks!

Re: Roof and rafter

Steve Jepson — Mon, 05 Sep 2016 22:38:01 GMT

not much of a tutorial but it shows the fundamental idea.

Stretch a node/nodes (or new nodes) from the edge of the roof about where you want the roof to be cut with an intersecting roof.

Select the stationary roof, press Ctrl and Click on the edge of the roof you want to intersect with it. A little practice and this is a very useful function.

https://youtu.be/wK9AB3qzV0Q

Re: Roof and rafter

Barry Kelly — Tue, 06 Sep 2016 01:36:22 GMT

Don't forget that the CTRL-click method for joining roofs only works with single roof planes and not with a multi-plane roof (you can convert these to single planes).
With multi-plane roofs you must 'Connect > trim to roof' or simply edit as if it was a polygon.

Barry.

Re: Roof and rafter

Anonymous — Tue, 06 Sep 2016 13:21:25 GMT

Cool! Thanks

Re: Roof and rafter

Erwin Edel — Tue, 06 Sep 2016 14:18:57 GMT

Single plane roofs merged together are more versatile and should achieve this a bit easier than multiplane roofs, in my opinion.

Re: Roof and rafter

Anonymous — Wed, 14 Sep 2016 17:19:33 GMT

This area does not need insulation, how to resolve?

Re: Roof and rafter

Anonymous — Wed, 14 Sep 2016 17:45:30 GMT

nojaano wrote:
This area does not need insulation, how to resolve?

Re: Roof and rafter

Steve Jepson — Thu, 15 Sep 2016 00:45:43 GMT

Use a different Composite for that part of the roof.
You could create a Complex Profile for the roof too if you like.

Personally, I think your barking up the wrong tree trying to model too many components at the same time. Model everything exactly like the actual materials.

Re: Roof and rafter

Barry Kelly — Thu, 15 Sep 2016 01:53:21 GMT

As Steve suggested I would model the roof surface, rafters and ceiling as separate elements.
The insulation could be modelled as well or could just be a fill in your sections.

If you can't do it all at once, break it down into the components.
A good motto to remember is "model it as it is built" - you can't go to far wrong if you do that.

Barry.

Re: Roof and rafter

Steve Jepson — Thu, 15 Sep 2016 02:35:53 GMT

Another reason to model roofs as individual components is for the sake of how fast you can get what you need for so many other parts out of that same roof. Ceilings, Rafters, Barge, Drip Edge, Fascia, Continuous Ridge Vent, Soffit, Garage Slab, Sidewalks, Subfloor, ... all by just tweaking a copy of a roof. The Roof has that Ctrl-Click function which I find so useful for all sorts of things.

Re: Roof and rafter

Erwin Edel — Thu, 15 Sep 2016 11:49:56 GMT

Yep, as I posted earlier: just model with single plane roofs and merge everything to 'one roof'. It is still a lot single plane roofs, but in 3D, elevation, plan etc all fills are nicely merged, no extra linework where it shouldn't be and proper PBC with walls etc.

The multiplane roof is excellent for the sort of design you only see in tutorials, imho.

Re: Roof and rafter

Anonymous — Fri, 16 Sep 2016 00:28:45 GMT

I got as I wanted, but something is wrong.
How do I get all these separate pieces into one connected?
As you can see is all lines see? and all the elements cant be cut as needed.
Video, image tutorial or reference, it would be better for me.
I marked a yellow lines of these places.

Thanks all!

Re: Roof and rafter

Gerald Hoffman — Fri, 16 Sep 2016 01:09:22 GMT

What I do is make up your composite structures without the top sheathing element and then add just the top element as a separate roof plane to cover everything.

The reason I do this is that I use it to add a roof cladding and then I can adjust the overhang of the sheathing if necessary at eaves and gables.

Cheers,

Re: Roof and rafter

Steve Jepson — Fri, 16 Sep 2016 02:26:58 GMT

Here is another tip for modeling that kind of attic space/bonus room.
The situation comes up where you may want to show the siding above the roof of the same wall that you want to have it show as drywall below the roof.
If you extend the roof sheathing into that wall to face of stud, you can use it to SEO the siding skin on that wall below the roof sheathing. There are several roofs in this section and composites for things like the ceiling with two layers of batt insulation at different thicknesses. That roof/composite merges fine with the sloped roof/ceiling composite with can also have vertical roof edge where the insulation ends down at the soffit.

Re: Roof and rafter

Barry Kelly — Fri, 16 Sep 2016 02:46:19 GMT

nojaano wrote:
I got as I wanted, but something is wrong.
How do I get all these separate pieces into one connected?
As you can see is all lines see? and all the elements cant be cut as needed.
Video, image tutorial or reference, it would be better for me.
I marked a yellow lines of these places.

Thanks all!

Roofs (unlike other elements) will always show lines when joined end to end even when their surfaces match.

This is why I would model the roof cladding as a single roof.
Then if you are happy with a solid 'slab' for your roof timber then model that as another roof (I would either model the actual timbers - just enough for the actual section or cheat with line work in the section).
Model the insulation as another roof (or again line work in section).
The finally model the ceiling lining as another roof where needed.

So you will have roofs stacked above each other rather than side by side.

Use layers to hide them all in plan except for the very top roof cladding.

Barry.

Re: Roof and rafter

Steve Jepson — Fri, 16 Sep 2016 02:46:23 GMT

nojaano wrote:
I got as I wanted, but something is wrong.
How do I get all these separate pieces into one connected?
As you can see is all lines see? and all the elements cant be cut as needed.
Video, image tutorial or reference, it would be better for me.
I marked a yellow lines of these places.

Thanks all!

I think the lines your seeing are temporary and have no effect on the output.

Are these those lines that you see or don't see if your using the scroll button on the mouse? 1 click for ward or back on the mouse scroll button makes lines visible or not visible. I am not sure if that is what those lines are or not.