I am designing a Javanese-style bungalow (with sort of 'Pizza Hut roof'. The bungalow is square, so the lower roof level is square, with a (supported) overhang of 1.25m.
But in 3 corners I want to remove the overhang to create half-open bathrooms.
My experiments with 'roof openings' were a disaster: they led to weird roofs with certain roof part 4m outside the outline of the bungalow.
I assume that 'roof openings' can only be created within the outline of the main roof, not in the overhang.
Then how to change the overhang?
You can use the roof cutout over the edges of the roof as long as you actually intersect the roof support line. Initially it will cause the roof to look odd, but that will soon correct itself when you change the three cutout edges so they are Gable. Obviously you would set the overhang on these to almost nothing. You can then drag the inermost edge back in so that it is almost in line with the support line again. See image.
I can be done another way too. Make two Breaks (right click) in the edge of the roof, drag the centre piece back slightly through the support line and then set the gable edges etc.
Allan
(Replying still here, now this thread started in the wrong place...)
I am on the way - but get lost. One of my problems: many English architectural terms are uncommon for me.
For 'gable' I find: triangular section of wall below a pitched roof
But what gables are we talking about in the case of a roof cutout (similar as on the pic)
And: how to 'change the edges into gables'?
Does it create problems if (as in my case) the cutout must not be rectangular, but a trapezoid, following a diagonal roof line?
It does not matter what the shape is. Gable is correct - normally a triangle but really what it means in this situation is a vertical face. The other sides of the roof are 30 degrees for example, a gable is 90degrees. Because your cutout is vertical it needs to be set to 90 degrees or a Gable.
Don't worry - keep this thread goin here now if necessary.
Allan
Seems we dummies keep you busy all day on this forum - you still have time for work?
Gable understood - but how do I transform the edges into gables?
On the edge of the roof that you want to create a gable or vertical edge, just select the Roof Style image on the Basic tab and chose Gable. When you do this, make sure you only have selected the edges that must be gable (green marker - all other must be red).
No I don't have time for work - thankfully I don't have to as I retired a couple of years ago! ;)
Allan
Here is cutout that is occurring on the roof corner, one half of square shaped cutout on both roof surfaces.
Then the two inside arrows are converted to Gable.
The main roof is set to multi pitch to start with. Mansard roof.
Jack
@Jack:
Thanks for the clear pic, it gives me better understanding what a gable is (didn't even know that word before).
But... in fact I do not want a gable!
I just want to cutout a roof opening so that the space underneath it will be open.
This to create a partly open bathroom (I live in Indonesia and try to create a tropical bungalow)
Do I understand that in that case I just have to make the cutout? Nothing else?
It is as in my earlier image - make the cutout and set the edges of it to Gable. As in the image make sure that those 3 edges have a green marker and all the others are red. All 3 edges will become vertical as if they were gables.
Allan
Hi Wim,
When you cut out an opening in the 'middle' of a roof , it creates a hole in the roof and no other adjustments are needed.
When you cut out an opening that is drawn 'outside' the edge of the roof, the roof is reconfigured at that point to all hip roofs. So you must do as Allan showed, select and convert to gables those 3 hip portions.
If you are cutting out at a corner, you will have just 2 'arrows' that need changing , as I posted.
Jack
Thanks, Jack. At the moment I am focussing on other part of my eleborate project but I will for sure get back to this post when I will try the cutouts again. The pic looks clear.
After a lot of time spent on other issues, now back to the complicated cutouts - I cannot make them, in spite of your help, Allan, Jack.
Have a look again, please. I attach a picture. I hope it is clear, together with the following explanation:
As said I am working on two (more or less identical) Javanese inspired bungalows with a so called joglo roof - meant to be our future home hotel.
Each bungalow has 3 rooms and each has a private semi-open bathroom: with a 'one-way looking glass panel' and with a roof cutout so part of the bathroom will be completely open.
When I make a cutout, the roof starts to completely reshape, with odd shapes, it should leave the typical joglo shape in tact.
Btw: the support of the roof is approximately at the top of the cutout. The rest is a (wide) overhang which will get extra (column and wall) support where needed. So basically I only need an 'overhang cutout'
But... how to do that?
Thanks for help!
Hi Wim,
The existing roof will go into all sorts of shapes unless you set all the edges of your cutout to Gable.
You must start drawing the cut totally outside the roof area ( and finish outside). You must make the cut deeper than the wall support point (must be greater than the Overhang). Click elsewhwere to deselect the roof, then select one of the edges you have cut out - the marker arrow will be green. Now select the other edges of the cutout, so that all three are green. Now right click and select Properties and change the Roof Type (roof symbol as in Jack's image) and change it to Gable. While still in roof Properties for these 3 edges, change the Overhang to 1mm or a fraction of an inch. The cutout should be complete.
You can now drag the inside edge back close to the wall support line but do not cross that line or the cutout will disappear.
In doing a cutout you are technically only cutting the roof, not the overhang, so there must be a tiny (even just 1mm) cut of the main roof for it to work. Also, the fact that you are cutting diagonally on the corner, will possibly cause problems, as the overhang may truncate at the support point, rather than being triangular. For this reason, I think it would have been to treat this as a total roof with no overhangs or just a few mm. From your model it does not look like a typical overhang roof, as it appears that most of the walls go to the edge of the roof anyway, with no overhang. This would make the cutouts much easier to do, since your whole cutout will be of the roof itself, not the overhang.
If you want to try converting the roof to a 'no overhang' roof, just select every edge (green arrows) and set the overhang to just a few mm. Your roof will shrink ovbiously. Now select one edge, right click and choose Move Edge - you will have two options, Maintain Support Height or Adjust Support Height (probably the latter or your roof would increase in total height I think and your beams would be out of place again). Anyway, choose which you prefer and drag the edge out to the wall or just beyond it. Now do the same for the other edges. The roof shape should be maintained. You should now find doing the cutout much easier, but you will still have to change each edge of the cutout itself to Gable of course.
Hope that helps.
Allan
Thanks again for the speedy and elaborate answer!
Will study it more thoroughly in the coming days - changing the whole roof to 'almost no overhang' is interesting!
Might as well quickly create that new type of roof, than changing the existing one.
Then experiment with the cutouts
Hi Wim,
I would try changing the existing one - if you have got the roof shape as you want it that is. It is not hard, if you can follow my description, just a matter of setting each edge to 1mm, (or slightly more), overhang, then draging the edges out again to the wall edge. Practise on a copy.
Allan
Hi Allan (and Jack too, if interested),
When your latest reply came in I had already deleted one old roof and created a new one, same shape but with hardly any overhang. Was easy.
So then I did the second too. Also easy.
Then I tried to make cutouts. Strangely enough, after a LOT of trial and error, in 3 cases I was successful, in 4 other cases not.
For 2 cases I can still understand why the behavior is different: it is where the two bungalows 'hit' each other (be it on a different level, 1.50m higher/lower than the other one). The 'contact area' is different, so the cutout behavior is (apparently) different.
In 2 other cases I could not figure out why 1 cutout in that bungalow could be created as intended, and the other 2 not.
For the moment I give up. My main reason to create this design is, to show a future architect what I want. Well, with the example cutouts I can tell him that the other bathrooms need to be treated similarly.
Three remarks that might be helpful for you and Jack if others ask for help about this cutout issue:
1. I was desperately looking WHERE in the properties menu I could change to gable. I did not see any menu showing that option till... I clicked ON the mansard picture and only then I saw a popup window showing the other roof types.
2. After you have cut out a roof piece and the roof shape becomes odd, it is not enough to click on the three edge arrows, because then the properties window will not show up. After the cutout you must first DESELECT the window, then SELECT it again and be SURE that not another arrow will turn green (it can be invisible, off screen if you zoom in much) than the three edges that must be 'gable-ized'.
3. After the three edges have become gables the roof shape in itself is normal again (but not in all cases, as described above). But the light green roof edges must be drawn far away from their supporting wall or column, otherwise the cutout opening will be way to small. In three directions the opening must be enlarged, so that the dotted lines match the position you have in mind.
Hi Wim,
I'm glad your making progress.
On the forum there is only so much one can do to explain things. As you can see from the attached, many of your questions are pretty well defined by using Help from within the program. I go to Help , then Index and type in a specific topic, like Gable Roofs.
Most all basics are covered in my Roof Training videos and many Advanced aspects of roofs. It took me over one month to make them and I feel most peoples questions and much more, would be answered in a much more concise and timely manner than that provided on the forum. But yours was a bit of a special situation so I added some comments.
Try Help, it is pretty good.
Jack
Hi Jack,
For the time being I think I will stick to help and the forum. I have feeling your roof video tutorials might be to elaborate and specific: I don't expect to develop other roofs in the future, because this will be a one time project.
Thanks for your help!
After several re-trials and re-errors I managed to get 5 out of 7 corner cutouts properly done.
Don't ask me how, I did the strangest and unconventional gabling, dragging, deleting, with the strangest results: one time even a odd shaped piece of ghost roof appeared a few meters from my building, which I could simply delete.
Anyhow, finally 5 cutouts were ok.
Still no idea why the other 2 only want to be cut out as rectangular, since 3 others had the triangular corner piece cut out successfully as well. I couldnt find the difference, but can live with this result.
Thanks for all the help.
Hi Wim,
What are your overhangs set to at the area of cutouts? If overhangs conflict with one another or extend into an adjoining roof, you will get some odd results. I call them 'yikes' roofs, cause when they happen I say 'yikes' , where did that come from.
Try reducing overhangs either to 1/8" or 0 in those areas. (zero doesn't always work, that is why I always use 1/8"). See if that clears up the 'yikes' roof section.
Jack