topic Re: Roof Wizard and Rafters in Modeling

Roof Wizard and Rafters

Anonymous — Tue, 23 May 2023 13:02:39 GMT

Whenever I use the roof wizard it always ends up putting the rafters on top of the roof. Is there a setting that controls this that I'm missing?

Re: Roof Wizard and Rafters

Rick Thompson — Wed, 10 Jun 2009 19:18:44 GMT

I'm not sure, but I don't have that problem. I have a composite roof with a 5 1/2" cavity (for 2x6's). When I use the wizard the rafters are placed in the cavity... more or less. Maybe the roof composite you are using is incorrect?

It's going to place the rafters at the bottom of the composite.

Re: Roof Wizard and Rafters

Barry Kelly — Thu, 11 Jun 2009 02:55:20 GMT

I'm guessing you only model to top skin of your roof (I do the same).
Roofmaker will place the roof timbers on the bottom surface of your roof.
If you allow a cavity in the composite like Rick does then it will all work well.
It would be nice to have a vertical offset built into the wizzard maybe instead of moving everything after it is placed.
The other option is to just copy the roof surface down to the level you want then delete or hide it.
Barry.

Re: Roof Wizard and Rafters

Anonymous — Thu, 11 Jun 2009 03:29:13 GMT

Barry wrote:
I'm guessing you only model to top skin of your roof (I do the same).

Yes, that is what I do. Looks like I'll be adding a cavity. Thanks.

Re: Roof Wizard and Rafters

Rick Thompson — Thu, 11 Jun 2009 14:15:50 GMT

When I want exposed rafters, I model the roof with the cavity, generate the rafters, then select all the roofs and switch composites to one that just has the decking and roofing. Then raise those roofs by the rafter depth. It is a work around, but not that bad. It can be pretty quick.

Re: Roof Wizard and Rafters

Anonymous — Thu, 11 Jun 2009 14:31:59 GMT

Rick,

You must have been reading my mind. I tried doing the composite thing with a cavity thinking the cavity wouldn't show. It did even though I checked the "hide" box in the dialog.

This workaround will work for me. Thanks.

Re: Roof Wizard and Rafters

Rick Thompson — Thu, 11 Jun 2009 14:37:29 GMT

glad it helped

Re: Roof Wizard and Rafters

Rakela Raul — Thu, 11 Jun 2009 14:54:31 GMT

It would be nice to have a vertical offset built into the wizzard maybe instead of moving everything after it is placed.

agree

very nice views Rick !!

Re: Roof Wizard and Rafters

Anonymous — Thu, 11 Jun 2009 15:03:03 GMT

Rakela wrote:
It would be nice to have a vertical offset built into the wizzard maybe instead of moving everything after it is placed.
agree

very nice views Rick !!

Can the "Create Roof Level Lines" command be used to do anything about this? I've never messed with it myself and don't know exactly what it's for.

Re: Roof Wizard and Rafters

Anonymous — Thu, 11 Jun 2009 15:05:56 GMT

Thanks for some useful tips guys, whilst were on the subject, i have the following problem

i have placed a roof on the outside points of my walls, i then goto the roof wizard and place my rafters etc, however, my plates (eaves purlins in archicad) do not sit on my walls, why not?
i know its me being a bumb arse, any help would be apprecieated.

Re: Roof Wizard and Rafters

Rick Thompson — Thu, 11 Jun 2009 15:25:22 GMT

About all I ever place are the rafters, ridges and valleys. Just know the Wizard will place the rafters at the bottom of the composite. If you have 1/2 GWB, then the bottom of the GWB is where the rafters are going to be set. You can adjust the depth of the birds mouth in the the rafter in the wizard under "Beams". I typically place the (first) roof, without worrying about height, then adjust it in section. That should place the rafters where you need it.

You can see in this screen shot the rafter are right in the porch beam. The bottom of the "temporary" roof composite was adjusted to sit right there. After the rafters were placed, then I switched roof composites to a simple 2" decking, and re-set the height or one roof, again in section, then optioned clicked the other roofs to set their height (when more than one roof is involved).