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# Re: Roof height for A-Frame

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Roof height for A-Frame
• From: "David Topete" <d.topete73(--nospam--at)gmail.com>
• Date: Tue, 11 Nov 2008 10:58:09 -0800

Okay, that's what I was thinking as well, although it doesn't seem to jive...

I am looking at a URM (unreinforced masonry, err... brick) building.  The pony wall along the long edges which the rafters bear is the URM wall, extending only 4 courses above the second floor sheathing, about 12".  The gable end walls are brick that extend to the roof ridge.  Seismic will govern either force direction due to its mass.

any other thoughts given some more detailed information?  Thanks again for everyone's input.

On Tue, Nov 11, 2008 at 9:26 AM, William Haynes wrote:
My first impression is the same as what Gordon states.

Will H

On Tue, Nov 11, 2008 at 10:57 AM, Gordon Goodell
<GordonGoodell(--nospam--at)harmonydesigninc.com> wrote:
> David,
>
>
>
> Are you taking roof height for wind or seismic?  For wind it would be the
> average height, ½ way between eave and ridge.  For seismic, roof height is
> where the diaphragm attaches, so at the plate, top of your pony walls.  And
> it's a stretch to call this a single storey...You've got a roof diaphragm
> and an upper floor diaphragm, even though for equivalent lateral force
> procedure your h values for each level are only separated by 18".
>
>
>
>
>
> regards,
>
> Gordon Goodell
>
>
>
>
>
> From: David Topete [mailto:d.topete73(--nospam--at)gmail.com]
> Sent: Monday, November 10, 2008 6:55 PM
> To: SEAINT
> Subject: Roof height for A-Frame
>
>
>
> Where would the "roof height" be defined for a "single-story" structure with
> enough volume below the roof (12:12 pitch) that creates a second floor?  The
> gable ends extend to the roof ridge, while the rafters bear on a pony wall
> +18" above the second floor.  The second floor is 11'-0" above the ground
> floor.  Any thoughts would be much appreciated.  TIA.
>
> --
> David Topete, SE
>
> ExchangeDefender Message Security: Check Authenticity
>

--
David Topete, SE