Roof Ridge Sag

Water damage although roofs are designed for optimal water drainage flooding or heavy rainstorms over time can cause damage to the structure of the roof.

Roof ridge sag.

Some roofs sag because of decay to the inside beams and sheathing. 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. He advised the insured that immediate temporary structural reinforcements should be inserted under the cracked ridge board to relieve the load on the broken ridge board and rafters. 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 most common cause of sag at the roof ridge is loss of triangulation due to failure of the bottom leg of the triangle which makes the peak of the roof sag and top of the walls spread outward in the area of failure. On initial review of the garage roof interior our expert immediately saw the cause of the garage roof bowing. Installing new rafters directly alongside the weak or damaged ones is often enough to correct this problem. The ridge board was cracked and sagging.