Sagging rafters improperly constructed roof walls not appropriately built etc.
How to fix a sagging shed roof ridge.
The first photo below shows a roof with an area of ridge deflection viewed from the side that is barely noticeable followed by the same area sighted down the ridge line.
You ll need a steel l channel to get your rafter or truss back into shape.
If that s what you re dealing with regarding your home take these steps to ensure your rafter or truss gets fixed properly.
How to repair sagging roof.
In many cases you ll need to fix sagging trusses or rafters to repair your roof.
A sagging roof can mean any number of things.
This article series describes explains the directions of forces in roof structures illustrating downwards force horizontal thrust and the causes of rafter sags rafters that disconnect from the ridge or top plate and why a sagging roof pushes the building walls outwards at the wall top.
Wood shingle roofing requires entirely different sheathing than other types of roofing.
Another cause of ridge deflection is impact damage to rafters.
Sagging rafters can lead to serious problems with the entire roofing system.
Also take into consideration your new roofing material if necessary.
If you have just stepped outside your house and realized that your roof is no longer straight this could signal a problem.
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.
Use your string line to determine how much the roof need to go up.
How to fix sagging roof trusses or rafters.