Roof Ridge Sag

Installing new rafters directly alongside the weak or damaged ones is often enough to correct this problem.

Roof ridge sag.

On initial review of the garage roof interior our expert immediately saw the cause of the garage roof bowing. Decay can occur over time due to a number of reasons including leaks in the roof or leaks from guttering or downpipes wet rot or even insect attacks such as termites damaging the ends of the bearings. When you have undersized rafters or inadequate storm bracing snow or ice resting on your roof may cause it 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.

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. Some roofs sag because of decay to the inside beams and sheathing. The ridge board was cracked and sagging. 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.