Framing Question

[KEVIN WOOD]

That Cathedral hip looks pretty complicated. Thanks for the file Randy.

[Andy E. Lee]

It may have been something the builder added for strength but was not necessary. I have never seen that in my area but considering you say it's 4 years old? you should be able to eliminate any "hooky repair techniques" from a home owner when trying to analyze it.

[Jeffery L. Haynes]

About 5 years ago I was called on my bracing of a irregular hip roof (10/12 and 12/12 coming together) by the AHJ........ I just did a T-post under the ridge board and busted the span of the hips to a load point that followed same to interior footings...........AHJ said that all points where the hip and ridge come together must be supported and advised me to do it the same way in your picture..... I asked him to show it to me in the IBC of which he said he would get back with me on........however until then if I wanted to move on to the next phase I had to do it his way.

The problem I have is that by creating the octagonal or hexagonal disk for a hip that truly does need additional support....your putting undue pressure on the edges of the flat support disk of which can then crack.
(I simply did a stacked trapezoid pyramid of which he signed off on)

An engineer I work with closely said that in regards to hips being self supporting it simply depends on the design..... in general the greater the pitch the more stable the hip.

I am sure there is some sort of ratio of length and width in relation to the pitch of the roof that determines what truly needs to be supported.

The purlins by the way are not properly built / braced if the horizontal member is not the same size of the rafters they are supporting....... I usually do an L brace purlins with t-post at 4 ft on center (all my joints are tight) and again all my braces transfer to load points to a proper footing in the crawl or slab.