Lateral Thrust Creates Dip in Roof Ridge

[jar546]

I wonder why?

 

[steveray]

I know of what you speak, but I don't get it from the picture.....The rigid roof triangle....If the walls cannot go out, the roof cannot go down....And to some extent....If the roof cannot go down, the walls will not go out....

 

[jar546]

I know of what you speak, but I don't get it from the picture.....The rigid roof triangle....If the walls cannot go out, the roof cannot go down....And to some extent....If the roof cannot go down, the walls will not go out....

The ceiling joists are not overlapped, and many have gaps between them. The vertical post you see must have been a temp brace while framing to hold the ridge board in place. If the walls move out, the center of the ridge board comes down.

 

[steveray]

The ceiling joists are not overlapped, and many have gaps between them. The vertical post you see must have been a temp brace while framing to hold the ridge board in place. If the walls move out, the center of the ridge board comes down.

Ahhhhh...looked more like a horizontal scuttle hole to me....Probably because I wouldn't expect 2x4 CJ.....Seems like those toenails were really putting the work in...And the drywall diaphragm....In our big 2010-2011 winter I had a few buildings were the walls moved inches....One, a bunch of ties were cut for the scuttle and an attic fan. Another was just "cross framed" with no tie across when it was built and another had a flush beam with hangers on the CJ and to all those playing at home, joist hangers are not rated for any kind of "pull out" force/thrust to the joist....Granted there was3+ feet of snow on the roof...