Roof overhang

[Anonymous]

Hi
I am having problems with roof overhead. One of the walls does not need to be overhanged and that’s where my roof falls off from one edge.
Thanks
Parm

[barthbradley]

What do you mean? Do you have different plate heights? 

Post a picture. 

[Anonymous]

Hi
Please see the attached link. File was too big to send.
Thanks
Parm
https://drive.google.com/file/d/1l3XwPWaajJxyw3QwH1D0J_ucpIKli63w/view?usp=sharing

[Anonymous]

Hi

please see the attached picture and ignore the porch roof joining comments. I have fixed It already 

thanks 

Parm 

[barthbradley]

Yeah: you have different plate heights. No wonder. If you want to do this as a monolithic roof, you will need to adjust the offset of the sketch lines to compensate for the difference in plate heights. Looks to be a negative offset of 150 at garage front and side walls.  This change will affect your gutter and soffit. You'll need to redo those elements as well.

FYI: the garage stem wall (that supports the garage walls) is typically flush with the  top of slab that supports the main house walls in SOG construction. In other words, your garage walls are the same height as your house walls. Do you get what I mean? There doesn't need to be a plate height difference.  

[Anonymous]

Hi

Thank you for your response. I didn't quite get what you mean by offsetting sketch lines. Is it possible for you to make the relevant changes in the revit file I sent above and send it to me. Your help is appreciated. 

Regards

Parm

[chrisplyler]

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@Anonymous wrote:

I didn't quite get what you mean by offsetting sketch lines.

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Edit the roof sketch. Select one of the sketch lines. Look at its properties.

[barthbradley]

...or he could just raise his garage walls so that the plate heights are the same.  

[georgehobel]

barth.. FYI...you've got your grade outside the garage higher than the slab height.  That's going to pond water inside your garage.

[barthbradley]

@georgehobel.  You pulling my leg? Looks right to me. 

...okay: the garage floor slab and stem wall are not monolithic; they're done in separate pours. So, yes, the pic is technically wrong.

...I hope you're not a plan checker in any jurisdiction I build in. You're tough! Ha! 

...actually, even the rebar is wrong! ARRGH! 

[ToanDN]

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@Anonymous wrote:

Hi

Thank you for your response. I didn't quite get what you mean by offsetting sketch lines. Is it possible for you to make the relevant changes in the revit file I sent above and send it to me. Your help is appreciated. 

Regards

Parm

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Select the sketch line and change Offset from Roof Base value.  But IMHO what you have is geometrically correct.  You can fix it to bring the non-overhanging eave to the same height as the overhang eave but you will create the same problem on the other end.    I would leave it.

[georgehobel]

I'm just taking notes...

Hope you're not one of those "I know how to do it, I saw it on TV" kinda guy....

[georgehobel]

@ Pam... just out of curiosity... what's the reason for not having an overhang on that end?

[barthbradley]

@georgehobel: What does that mean? I'm not following. FYI: 25 year of practical experience. You? 

[ToanDN]

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@georgehobel wrote:

@ Pam... just out of curiosity... what's the reason for not having an overhang on that end?

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Friendly neighbor not thrilled by an overhang lapping the fence, maybe?

[georgehobel]

that's what I was thinking... either that or a real tough inspector, measuring the setback to the overhang...

@Anonymous...LOL.. "practical" is almost irrelevant these days.. The only thing that matters today is what they think you know.

[barthbradley]

@georgehobel: I did find this on TV. Does it help? 

https://www.youtube.com/watch?v=xzICeh1qAKc

[barthbradley]

@Anonymous: Never mind all this bantering about overhangs. If that's you design intent, and it's allowed; then go for it. The issue is with your garage wall sill/mud plate being anchored to the garage floor (which is sloped for drainage!). That not going to work; plain and simple. And, that's the only reason I can see for the 150 mm offset difference between the top plate of the main house walls and the garage walls. Elevate your garage walls! Put a stem wall under them and call it a day. No issues with the roof now. 

[Anonymous]

Hi George

Thank you for your feedback. The garage wall needs to be built on the boundary for that side. That's why I can't have overhang on that side.

Cheers

[Anonymous]

Hi Barth

Thank you for your suggestions. Yes I have two different height walls and that was causing the problem. I fixed them up and its all working fine. 

Regards