Roof Bowing In The Middle

They have issues for a wide variety of reason including damage from wind storms overloading from ice and snow leaks etc.

Roof bowing in the middle.

What causes a sagging roof line. Use your string line to determine how much the roof need to go up. There are different reasons and types of curling. That s why most of the ridge sagging occurs in the center of the roof page top photo.

One of the most common causes of roof issues are problems related to the rafters or trusses. Curling shingles also referred to as fishmouthing is when asphalt shingles have curled on the ends and appear to be bent or twisted. 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. 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.

Repairing a roof rafter in this condition is not a hard project but it can be difficult if there is not easy access. Roof lines should be arrow straight. Installing new rafters directly alongside the weak or damaged ones is often enough to correct this problem. This often occurs in the middle of the shingle tab.

It is more common than you might think for a concrete block foundation wall to bow inward and repairing the problem is a tall order even for an accomplished do it yourself homeowner. If your rafters are still sagging a bit and it is causing your roof to dish out a little in the center of the roof sides add a 2x4 that goes all the way across the rafters in the center of the length of the rafters. It might be something. As the wall tops are pushed outwards at their center either the entire wall leans over or as the wall is held up at the building corners gable ends the wall center may break and bend over as in my photo above.

Therefore giving them a good look is critical when addressing sagging bowed or wavy roofs. Undersized rafters also can cause sagging along the whole side or plane of a roof.