Originally Posted By: Jay Moge This post was automatically imported from our archived forum.
Iv’e seen many many roofs with “dips” in them. up here we have some pretty snowy winters. my brother in lay is a roofer and he told me that the heavy snow causes this to happen. usualy the first couple of bad winters a new roof sees (as lumber is still drying) the main (or ridge) beam saggs a little as all the wood settles. suggest a stuctural engeneer inspect for integrity of roof frame.
Larry K.
your pic could be a poorly designed dormer?
Originally Posted By: loconnor This post was automatically imported from our archived forum.
Thank you everyone for your reply and feedback. A special thanks to Kevin Williams for fixing my photo. I greatly appreciate it. Was that magic or what?
This home is 55 years old. Although the gentleman who use to live here took very good care of the home, the dips in the roof is another story. I was expecting to see collar beams or ties at each of the roof rafters The one collar beam with all those vertical supports are all I saw. At the end where I was standing, there were only three vertical supports. These supports looked like they were added more recent.
Originally Posted By: mcyr This post was automatically imported from our archived forum.
Too many Larry's in this post I am
Would someone find out who built this roof and send him or her to framing school, but please don't refer them to Commercial Building!
Report: It appears that the framing techniques used in framing this roof were far from adequate and would recommend a P. E. to evaluate.
Originally Posted By: loconnor This post was automatically imported from our archived forum.
Marcel
Thank you for that feedback. That was what I was thinking. Is it necessary to have collar ties on this simple roof design. The size is about 1100 SF. This is the first roof with a sag, I've found. So was not sure if this "setup" contributed to the sagging.
Larry, Larry,... This is Larry  Thank you for your feedback also.
Originally Posted By: mcyr This post was automatically imported from our archived forum.
Collar ties would have helped in general to provide in eliminating pressures to the outside walls, but would not have helped this inadequate framing at the dormer.
They most conventional way would have been to have gone by with the main roof rafters and then build the dormer on top of the plywood of the main roof. The other way to have done this correctly would have had to have one of the valley rafters doubled up and run up to the ridge. This double would in turn pick up the opposite valley rafter.
Not knowing how wide the dormer is, sometimes the trimmer rafters on each side of the dormer are doubled up and then a header is provided between the two to pick up the ridge of the dormer.
In any case, this scenario, did not even come close to being adequate.
I also see that they might have tried to support the ridge of the main roof where it might have been spliced. Looks like a poor version of a king post.
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