Hail Damaged Roof Replacement: Part 8 – Dead Valley and Stucco Wall Flashing

Dead valleys are a frequent source for roof leaks and special attention is needed when installing the new roof. Stucco walls require new step flashing and counter flashing. Kickout flashing is installed at the corners and roof end to direct water away from the wall. This project is continued from Hail Damaged Roof Replacement – Part 7.

Roof Dead Valley Installation

Dead valleys can be a problem for leaks because it tends to hold water and/or become clogged with leaves and other debris. Extra care is needed when installing the new roof to make the dead valley water tight.

Roof Dead Valley at Stucco Wall

Roof Dead Valley Ice and Water Shield

GAF StormGuard® leak barrier (ice and water shield) is installed in the dead valley and run several inches up the stucco wall. The low slope porch roof is also covered with StormGuard applied over the roofing felt.

New Roof Installation: Dead Valley and Porch Roof with Ice & Water Shield

Stucco Wall Kickout and Step Flashing

In the next photo, a large section of kickout flashing is cut and formed from a roll of coil flashing to direct water away from the wall at the end of the roof. The kickout flashing is essentially a piece of step flashing installed over the starter strip shingle. The exposed flashing is spray painted gray for appearances.

Also notice the roof felt is set underneath the old step flashing along the stucco wall. The old step flashing can’t be removed without damaging the stucco, so it is left in place.

Kickout Flashing Installation at Stucco Wall

Sections of black factory-painted step flashing are interleaved with the shingles in the normal way:

Roof Step Flashing Installation at Stucco Wall

Roof Corner Flashing

The corner flashing is composed of several layers of step flashing, coil flashing, ice and water shield and kickout flashing as illustrated in the next set of photos.

The last piece of black step flashing is installed over the shingle at the wall corner:

Roof Corner Flashing Detail: Ice & Water Shield over Step Flashing

Next, a piece of step flashing for the corner is made from a roll of galvanized metal flashing. The corner flashing is cut to shape with tin snips, folded and bent to wrap around the corner of the wall and lay on the dead valley. Galvanized flashing must be used here because aluminum flashing will crack when bent and folded, inviting a leak.

Corner Step Flashing Custom Made from Coil Flashing

The ice and water shield is laid over the corner step flashing. The ice and water shield is very sticky and will seal itself to the galvanized corner flashing with the daytime heating.

Rof Dead Valley and Wall Corner Flashing Detail

A piece of kickout flashing is made from roll flashing to divert water away from the wall at the corner and installed at the dead valley. The exposed area is spray painted with gray roofing paint to blend in with the roof.

Roof Dead Valley and Corner Kickout Flashing

Another view of the corner kickout flashing. I now have two kickouts along the stucco wall: at the corner and bottom of the roof.

Stucco Wall Corner Kickout Flashing Detail

Dead Valley Step Flashing & Apron Flashing

Additional sections of galvanized roll flashing are cut to size to install the gray painted step flashing and apron (or headwall) flashing in the dead valley. The apron flashing is the piece in the center of the dead valley that lays on top of the shingles. A roll of GAF StormGuard ice and water shield is in the foreground.

Roof Dead Valley and Wall Corner Flashing Details: Step and Apron Flashing

Stucco Wall Counter Flashing

Factory painted black counter flashing is installed over the step flashing. The counter flashing is mechanically fastened to the stucco wall with hammer drive anchors (a.k.a. “nail drive anchors”). The hammer drive anchor heads are sealed with BASF SONOLASTIC NP1.

Roof Dead Valley and Stucco Wall Counter Flashing

Detail of the stucco wall counter flashing and kickout at the wall corner. The top of the counter flashing has a lip that extends away from the wall so it can be filled with a high quality long lasting sealant such as NP1 to form a watertight seal against the stucco.

Stucco Wall Counter Flashing Sealed with BASF SONOLASTIC NP1

Another view of the stucco counter flashing and dead valley:

Roof Counter Flashing on Stucco Wall

Closeup of the stucco wall counter flashing, two kickouts and transition to the porch roof. The counter flashing was cut to fit over the lower kickout flashing, then the joint sealed with SONOLASTIC NP1. The counter flashing covers the apron flashing (headwall flashing) on the porch roof – I’ll describe this in more detail in a following article.

Stucco Wall Counter Flashing, Kickouts and Porch Roof Transition Details

Photo of the new roof showing the stucco wall counter flashing, dead valley and transition to the porch roof. Two other details are:

  1. I replaced the rotted soffit and fascia board on the left where it meets the roof.
    See the next installment of this series (coming soon) for the details of that job.
  2. I added a gutter downspout extension to carry the water further away from the wall.

New Roof Counter Flashing along the Stucco Wall

This series is continued in Hail Damage Roof Replacement – Part 9.

Take care,

Bob Jackson

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