Roof Ridge Sag

Some roofs sag because of decay to the inside beams and sheathing.

Roof ridge 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. The ridge board was cracked and sagging. 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. Installing new rafters directly alongside the weak or damaged ones is often enough to correct this problem.

On initial review of the garage roof interior our expert immediately saw the cause of the garage roof bowing. 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. 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. When you have undersized rafters or inadequate storm bracing snow or ice resting on your roof may cause it to sag.