Evidence of a Roof Leak

Posted by in Roof, Water Sources | April 11, 2016

What caused damage to the drywall on this ceiling (Figure 1)?

Figure 1  Water damage to drywall ceiling.

Figure 1 Water damage to drywall ceiling.

The damage is not due to a one time leakage.  It is just too severe for a one time ice dam.

Climbing into the attic above the kitchen we found severe discoloration and delamination of the roof deck.

Figure 2 Roof deck severely discolored and delaminated.

Figure 2 Roof deck severely discolored and delaminated.

Note that the damage extends downward from the chimney.  The lesser damage up slope is due to the protection afforded by the roofing paper.  However, once the roof runoff infiltrated under the roofing paper  it was able to infiltrate through the joint in the roof deck.

Roof leaks commonly evidence a path leading back to the source of the water entry.

Getting on the roof we found poor flashing where the roof meets the wall.

Figure 3 Poor flashing where roof meets wall.

Figure 3 Poor flashing where roof meets wall.

The cause is poor flashing.

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