topic Re: Roof overhang in Revit Architecture Forum

Roof overhang

Anonymous — Fri, 23 Feb 2018 04:09:38 GMT

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

Re: Roof overhang

barthbradley — Fri, 23 Feb 2018 04:33:52 GMT

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

Post a picture.

Re: Roof overhang

Anonymous — Fri, 23 Feb 2018 05:13:58 GMT

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

Re: Roof overhang

Anonymous — Fri, 23 Feb 2018 05:25:24 GMT

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

thanks

Parm

Re: Roof overhang

barthbradley — Fri, 23 Feb 2018 07:02:30 GMT

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.

Re: Roof overhang

Anonymous — Fri, 23 Feb 2018 07:19:07 GMT

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

Re: Roof overhang

chrisplyler — Fri, 23 Feb 2018 14:55:38 GMT

@Anonymous wrote:

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

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

Re: Roof overhang

barthbradley — Fri, 23 Feb 2018 16:42:59 GMT

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

Re: Roof overhang

georgehobel — Fri, 23 Feb 2018 22:38:53 GMT

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

Re: Roof overhang

barthbradley — Fri, 23 Feb 2018 23:36:41 GMT

@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!

Re: Roof overhang

ToanDN — Sat, 24 Feb 2018 00:42:52 GMT

@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

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.

Re: Roof overhang

georgehobel — Sat, 24 Feb 2018 00:54:29 GMT

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....

Re: Roof overhang

georgehobel — Sat, 24 Feb 2018 01:03:12 GMT

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

Re: Roof overhang

barthbradley — Sat, 24 Feb 2018 01:07:06 GMT

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

Re: Roof overhang

ToanDN — Sat, 24 Feb 2018 01:07:29 GMT

@georgehobel wrote:

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

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

Re: Roof overhang

georgehobel — Sat, 24 Feb 2018 01:24:15 GMT

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.

Re: Roof overhang

barthbradley — Sat, 24 Feb 2018 01:26:26 GMT

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

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

Re: Roof overhang

barthbradley — Sat, 24 Feb 2018 01:38:02 GMT

@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.

Re: Roof overhang

Anonymous — Sun, 25 Feb 2018 00:19:21 GMT

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

Re: Roof overhang

Anonymous — Sun, 25 Feb 2018 00:21:21 GMT

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