marisco

Butterfly roof with saddle or cricket

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Hi Guys,

newish user - using X8 on a project I am doing for a semi detached house. I am having a hard time enforcing my vision of the roof into the project with how chiefs roofs work with my limited knowledge. What I am attempting to do is to make a butterfly roof with the shed slopes front and back and a saddle running between them to shed water. When I get the saddle/cricket in place and try to join it to the other planes, the roof goes all wonky (or I need to extend the eaves to almost 4'-0"! Any tips on how I can get this to work? alternatively I could try a troughed butterfly - just not sure how to add a gutter between the shed roofs.... Any help is much appreciated. I'm really starting to like Chief, but these few things just irk me....

semi project butterfly.jpg

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Something like this?

 

Are you trying to auto build the roof?

 

 

marisco 1.jpg

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More savvy folks than I might be able to auto-build this, but I would do it manually.

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I was trying to manually do it - auto-build gave less than desirable results (probably due to the cantilevers. the pitch is 2/12. but yes Solver - what you are showing is what I am trying to accomplish. here is the second floor underneath

The biggest issue is that if I split the planes and move to where I think the ridge should meet the shed roofs, my planes are all off - if I use the join tool it places the roof in odd above below areas as well.

 

i was thinking of working out where the exact middle should be and try from there manually, but there has to be an easier way.....

2nd floor.jpg

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This type of roof can definitely be done almost completely automatically.  Here's a quick example.  Note that you can either break the wall like I did on the top OR you can use the Gable/Roof Line tool...

 

Roof.jpgPlan.jpg

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Remember the Fascia Height and overhang dimension needs to match for the roof planes to join correctly.

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Roof Drainage?

What are the proposed solutions for collection roof drainage from 

the proposed butterfly-saddle design?

Appears there will be a substantial flow of water to each outlet.

 

The traditional butterfly uses a wide central box gutter as a holding

reservoir that then allows progressive water flow to the end rainwater heads.

 

 

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I agree, water disposal is going to be a big problem.

Even with huge rainwater heads, I think you are going to have problems.

 

Here is a similar one I did a few years back.

I designed a near flat central roof that fell to each side and the water was then picked up in some oversized gutters.

This worked well with no water problems.

New Image_171.jpg

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Drainage is THE issue with an inverted gable. The saddle method is not great, if you can I would suggest glenw's method. More control there.

If you do have a saddle be sure to leave yourself some eave to have a large scupper and downspout.

 

It is possible to do a lot of the roof automatically but you will almost certainly have to manually edit some of the planes.

 

 

 

Untitled 4.jpg

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decide to go with Glennw's route - not that we get that much rainfall/snowfall (320mm/126mm per year) but will also make for easier framing. Great idea, thanks.

 

I know the skylights are not the best idea on that low pitched roof - just asking to fail - client insists they need them in the bathrooms.....

 

colour matching the fascia trim to the windows and soffit to the decks

 

 

roof 2.jpgroof.jpg

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