A ridge that droops in the middle forming that unintentional western design feature likely is due to undersized rafters and or missing or inadequate internal bracing rafter or collar ties.
Roof sagging in middle.
Additionally if your roofer has used material that is much heavier than your previous roof it can sag for the same reason.
Two or more roofs on one structure spell trouble.
In a stick frame non truss sloped roof these issues usually cause the roof ridge to sag in the middle giving it a swayback look but can also cause one side of the roof to sag.
The first step is to always check the beams so that you can determine their condition.
If you find an infestation of.
When the roof framing is assembled two ceiling rafters are often joined together to create a longer span.
A sagging roof can come in one of a few classic forms each with its own cause.
The home may not be designed to support the weight of this extra roofing material and it will sag.
Non foundational reasons for a sagging roof.
Once you have your wood in place you need to lay.