Originally Posted By: Anonymous This post was automatically imported from our archived forum.
I was hoping one of you engineers would just offer an opinion for my personal knowledge. I won’t pass it on and have already recommended an SE evaluation.
The picture is of an addition that’s about 4 years old. The ridge in this room is
21 feet and the from eave wall to eave wall is 34 feet. The ridge is down at least an inch in the center, with noticeable deflection in the field of the roof as well.
I think the collar ties are incorrect, and rafter ties may have been needed for a span this great.
Originally Posted By: Guest This post was automatically imported from our archived forum.
Thanks Erby,
I had read the thread in its entirety before, I was really looking for a free opinion on this particular case because the seller has a son for a lawyer and the engineer will be there Thursday to check it.
I'm pretty convinced that the walls are spreading, the ridge is dropping and the collar ties are sucking the field of the roof down as it meanders on its journey to earth, but just wanted another opinion.
Originally Posted By: ecrofutt This post was automatically imported from our archived forum.
I don’t run into it often, and I know its too late for yours, but perhaps it’ll help others.
A fifty foot metal tape and measuring distance from wall to wall at base on both ends and the center, then the same at the top of the wall, will usually pretty much confirm this, though all I do is report the measurements and recommend the structural engineer.
Originally Posted By: Randy Mayo This post was automatically imported from our archived forum.
Chad
From my experience as a structural engineer there is about a 90% chance the roof system is underdesigned or more likely not designed at all. If the roof is built from convential 2x6 rafters and collar ties alone the rafter will bend, the ridge line will sag and the walls will usually bow out.
Originally Posted By: roconnor This post was automatically imported from our archived forum.
Note that in the image Randy posted the ties are still attached to the rafters … but that connection would be very heavily loaded and will usually at least start pulling apart with just nailing. That results in even more movement of the roof framing.
Just my 2 nickles
-- Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong
Originally Posted By: ecrofutt This post was automatically imported from our archived forum.
nickle: /ni'kl/ n. [from `nickel', common name for the U.S.
5-cent coin]
nick?el:
1: Symbol Ni A silvery, hard, ductile, ferromagnetic metallic element used in alloys, in corrosion-resistant surfaces and batteries, and for electroplating. Atomic number 28; atomic weight 58.69; melting point 1,453?C; boiling point 2,732?C; specific gravity 8.902; valence 0, 1, 2, 3. See table at element.
2: A U.S. coin worth five cents, made of a nickel and copper alloy.
Geeze, can you tell I'm bored to tears. Nothing to do until 2:00. Bummer.
J/K had to razz ya a bit. 