Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: RESIDENTIAL: Discussion of Load Paths

[Subject Prev][Subject Next][Thread Prev][Thread Next]
"Then the last piece of the puzzle would be the design to handle the increased thrust at the base of the king rafters, as well as the increased compression in the king rafter itself?"
 
Yes
 
incidentally I've seen a roof have a big "dent"  in it from a windstorm. The owner had removed the posts that supported the ridge/hips to make more storage room.
 
 
 
Rand
----- Original Message -----
Sent: Friday, October 08, 2004 2:12 PM
Subject: Re: RESIDENTIAL: Discussion of Load Paths

> UNLESS you can show that the diaphragm action of the sheathing keeps them in place. These are NOT "out of plane" forces I'm talking about, they are IN-PLANE forces of the sheathing that is NOT in the plane that is defined by the two hips (I hope that's clear; personally I always have a problem with verbal descriptions of geometry).
>  
> Is the hip holding up the sheathing or is the sheathing holding up the hip? I'll bet on the hip. I always like to put a support at the end of the hip as opposed to the king rafters carring it but my point is that it can be done (no vertical support) and the physics support it. It's staying in the air does not mean that the sheathing is holding it up (not to say that the sheathing doesn't somewhat aid in the support but the hip is holding up the sheathing)
>  
>  - Then the last piece of the puzzle would be the design to handle the increased thrust at the base of the king rafters, as well as the increased compression in the king rafter itself?  I see some builders being told to upsize the hip rafters by the lumber yard that sells their materials (#^$#^%), but they aren't completing the design of the king rafters and the tension tie.  So they go up as is, and they aren't adding in columns as an alternate.
>  
> At least that's what I see in this area.  It gets scary when I look at the hip roof on my own house and wonder what's going to happen when that design snow load event happens.
>  
> Jim Wilson
> Stroudsburg, PA
>
>
>
>
> ---------------------------------
> Do you Yahoo!?
> Yahoo! Mail - You care about security. So do we.