so which one of those three was the engineer ??? Yes as a buyer I would run from that roof…
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that roof looks like a 4/12…plenty of room to get in there…
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I’m guessing the 3rd one.
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thats the one to go with…
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As a home inspector, my first thought would be that 10" dip is pretty bad. I would suspect something is not right with the framing (trusses). And, I would do whatever I could to look into that part of the attic. As homeowner/seller, you are going to need to address the issue in some manner (repair yourself or get some quotes and provide a discount/credit to the buyer). It is not likely to be overlooked.
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In order to assess the problem and provide access for repairs make a larger access opening. Based on the age it’s likely a stick built roof that relies on interior support walls. If its been that way for a long time you will never be able to straighten that out. Labor alone working in an attic could buy allot of trusses. No reasonable person would buy it and no insurance company would touch it in its current condition. Just do the math, if the cost to repair is more than the house is worth your going to have to make some hard decisions.
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Agreed! Why speculate?! IMO, it is silly to consider any repair option until the problem is properly diagnosed.
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Buckeled roof deck shething.
Raised truss outline.
Recommend full review by a licensed general contractor with inhouse structural engineer.
How do you KNOW that they are trusses? 
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Maybe the guys that came out to look in the attic were extremely big and could not fit through the attic access? 
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Yep, Larry and Randy said it, open the scuttle hole larger!
How do you KNOW that they are trusses? 
I read, the OP’s discription, " but likely some issues with the trusses."
And you think he saw trusses on a 71 year old home?
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OR… Create a second access of currently required dimensions near where the roofing issue is located, assuming that the original access is not close-by, based upon “can’t see the problem because can’t access the attic” .
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Trusses in a 1952 build is not unusal. I have seen trusses in century buildings.
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I owned a house built in the late 40s, it suffered from the same problem. 2x6 roof rafters. It wasn’t as bad as this and one of the primary causes was that a prior owner had removed half of one of the collar ties. The other half was attached to a small bathroom. These were old school collar ties that attached right at the top of the wall and ran clear across the interior space.
The field on the front of the house where this tie was cut sagged as the wall bowed out. This picture below is during the 2012 remodal and it was all fixed. We added a level, doubled the square footage of the house and tripled the volume. Fixing all the issues along the way. It was an old 750sq foot camp cabin built in the 40s. 5 years later tore the kitchen off too. All this old crap has to go :). You can watch the kitchen go below.
To the OP, tear it off and get it fixed or you’ll scare at least 2/3rds of the buyers off.
You could be correct, but I lack confidence in them being trusses and not rafters. It was sometime in the 1950’s that the metal truss plate was invented. It would be nice to have a picture of the problem area, however.
As long as it is sound. I would just note what I seen.
I concur Larry, but I am going off of the OP’s post.
*Note: A Detailed History of Components.
Since the invention of the 2x4 in the 1830s, there has been no greater single force for creating change and improvement in American construction than the building component manufacturing industry. The invention of the first metal truss connector plate in Florida in 1952 marked the beginning of the industry that in just over five decades has vastly changed home, apartment and commercial building construction. These changes benefit all who are involved in the construction chain – the building designer, the builder, and the residential or commercial building owner.
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