When i bought my house the garage roof had a sag.
Warped roof trusses.
First look for cracked plaster and warped window and door frames.
When a roof shifts it can make windows and doors difficult to open and close.
This is rare with an engineered truss system but i do occasionally see some that have broken on occasion.
Warped truss member from what i have seen in the past the wood used to make trusses is high quality lumber no knots 4 corners clear smooth grain.
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Trusses offer close fabrication tolerances that benefit homes with complex roof framing configurations.
If you notice that there is a visible dip in your roof chances are you have a problem with one or several rafters and you may soon be facing more issues like water leaks bowed out walls or your roof caving in on you.
Roof trusses as well as most other framing components must be installed and blocked in order to prevent bowing.
One of the most common causes of roof issues are problems related to the rafters or trusses.
It is also very important to find out why the trusses bowed in the first place you may be correct in your analysis that the trusses should have been cross.
If a seasonal crack opens along a wall somewhere in the middle one or both truss ends are rising or the truss is arching.
This problem occurs occasionally with roof trusses.
Therefore giving them a good look is critical when addressing sagging bowed or wavy roofs.
In the photos shown the lumber looks like typical framing lumber.
Stabilizing a sagging roof with trusses joists.
Sagging rafters can lead to serious problems with the entire roofing system.
The first case is a foundation problem.
A bowed truss floor joist or beam looses a great deal of it s strength.
2 roof support broken the roof truss or rafter could be warped or literally broken.
For homes with a unique roof shape trusses are the best choice for supporting a roof.