Hail Damaged Roof Replacement: Part 9 – Porch Roof and Stucco Counter Flashing

This project is continued from Hail Damage Roof Replacement – Part 8.

The new porch roof details are illustrated with the stucco apron/headwall flashing and counter flashing installation steps. A section of rotted soffit and fascia board are also replaced.

Low Slope Front Porch Roof Installation

The roofing crew has finished installing the new roof on the back and right sides of the house and are now working on the front. GAF StormGuard® leak barrier (ice and water shield) is installed in the roof valleys, then the GAF Shingle-Mate® roofing felt is stapled to the roof deck.

Low Slope Porch New Roof Installation

The low slope (3/12 pitch) porch roof is covered with a layer of GAF Shingle-Mate fiberglass reinforced roofing felt (equivalent to 30 lb felt).

GAF Shingle-Mate® Roofing Felt on the Low Slope Porch Roof

Then the GAF StormGuard ice and water shield is installed on the low slope roof. Low pitch roofs shed water more slowly than steep roof and are more prone to water working under the shingles due to wind blown rain and ice dams. The peel & stick ice water shield forms a waterproof membrane that seals around roofing nails and overlapping sections to keep the roof deck dry. My roofing contractor would only provide a 2 year warranty on the low pitch porch roof for these reasons.

GAF StormGuard® being Installed on Low Slope Roof

The next photo is low pitch porch roof with a layer of gray ice and water shield. Notice how the GAF StormGuard ice and water shield is laid up the stucco walls on both sides.

Low Pitch Porch Roof Covered with Ice and Water Shield

Another view of the ice and water shield:

New Roof with GAF StormGuard (Ice and Water Shield)

Porch Roof and Stucco Counter Flashing

Roof-to-Wall Apron Flashing Installation

Long sections of galvanized Apron Flashing (also known as Headwall Flashing) with a 110 degree angle are installed where the porch roof meets the stucco wall. The 10 foot long sections of apron flashing with are spray painted “frost gray” with roof flashing paint to better blend with the roof.

Apron Flashing (Headwall Flashing) and Roof Flashing Spray Paint

The apron flashing lays on top of the shingles to shed water and will be covered by counter flashing:

Roof to Wall Apron Flashing (Headwall Flashing) Installation

A piece of straight flashing extends past the outside corner to make a kickout, followed by two pieces of black step flashing.

Roof Apron / Headwall Flashing at the Stucco Wall

Sections of black counter flashing are fastened to the roof with hammer drive anchors (nail drive anchors). The counter flashing lip and joints are caulked with BASF SONOLASTIC NP1 for a watertight seal against the stucco wall. The hammer drive anchors are also sealed with NP1. Notice the attention to detail where the kickout section of counter flashing (black metal tab) is bent over the gray corner flashing to keep the two pieces from spreading.

Stucco Wall Counter Flashing Sealed with BASF SONOLASTIC NP1

Another view of the wall corner counter flashing and apron flashing. The nail heads in the gray apron flashing are sealed with NP1 (yellow square).

Stucco Wall Corner Flashing and Apron Flashing

Complete view of the porch roof and stucco wall counter flashing, apron flashing and corner treatment:

New Roof: Stucco Wall Counter Flashing and Apron (Headwall) Flashing

Stucco Wall Counter Flashing and Kickout Flashing

A section of galvanized roll flashing is cut, folded and bent to make a rain diverter kickout where the roof ends at the stucco wall.

Kickout Flashing Made On Site from Galvanized Roll Flashing

Bottom view showing how the roll flashing is folded to make a kickout rain diverter. Galvanized steel flashing must be used because aluminum will crack and leak when bent this way.

Bottom View of Galvanized Roof Kickout Flashing

The kickout flashing is installed followed by black step flashing interleaved with the shingles. Notice how the gray GAF Stormguard ice and water shield runs up the stucco wall behind the flashing.

Roof Counter Flashing with Kickout Flashing at Stucco Wall

Closeup detail of the galvanized kickout flashing to direct the water away from the stucco wall and into the gutter. If you look closely, the kickout flashing goes over the starter shingle that’s just peeking out to the left of the kickout flashing.

Stucco Wall: Roof Rain Diverter Kickout Flashing Detail

The black counter flashing is fastened to the stucco wall with hammer drive anchors (masonry fasteners). The counter flashing is painted at the factory and covered by a plastic film to protect against scratches. Note how the counter flashing is cut to fit over the kickout flashing at the roof end.

Stucco Wall Counter Flashing Installation Detail

The lip of the counter flashing, masonry anchor heads and kickout flashing slot are sealed with BASF SONOLASTIC NP1:

Roof and Stucco Wall Counter Flashing Sealed with SONOLASTIC NP1

Rotted Soffit and Fascia Board Repair

The wood fascia board and plywood soffit were rotted where the wood contacted the roof and wicked up water. The roofers installed a piece of rain diverter flashing behind the fascia board to direct water away from the soffit, but the wood fell apart due to the rot.

Rotted Soffit and Fascia Board

While the roofing crew was busy elsewhere, I removed the gutter, rotted fascia board and soffit. It was badly deteriorated where it contacted the roof. Water stains inside the soffit extend to the soffit vent:

Rotted Wood Fascia Board and Soffit Plywood

I installed a new section of 1″ x 8″ AZEK PVC plastic trim board (available at Home Depot), new section of soffit plywood and soffit vent. AZEK PVC trim board is rot- and insect proof. The job involved lots of cussing because the plywood soffit was stapled to the 2×4 lookouts through the crown molding, making it difficult to remove. I reinstalled the fascia and soffit with wood screws. The gutter was reattached with gutter spikes, pop rivets and the seams sealed with gutter sealant. The soffit joints were sealed with exterior silicone caulk.

Rotted Fascia Board and Soffit Repair

The roofing crew later sealed the soffit-to-roof joint with white colored SONOLASTIC NP1 caulk (yellow arrow). I added the gutter extension to direct the rain water well away from the house.

Rotted Soffit and Fascia Board Repair with AZEK PVC Trim Board

I painted the soffit and fascia with Sherwin Williams Duration® exterior latex paint. The soffit was now better than new!

This series is continued in Hail Damage Roof Replacement – Part 10.

Thanks for reading,

Bob Jackson

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4 Responses to Hail Damaged Roof Replacement: Part 9 – Porch Roof and Stucco Counter Flashing

  1. Joe Thompson November 24, 2014 at 6:49 pm #

    Since stucco is porous and is required to have a “drainage” plane behind it’s surface, where does the drainage plane discharge to? In your details you have flashing adhered to the face of the stucco. Water within the stucco system will have no where to go.

  2. dan September 13, 2016 at 12:33 am #

    Is the kickout flashing galvanized steel and all drip edges aluminum? My roofer is quoting “install CertainTeed Winter Guard to all eave areas and valleys, also including aluminum drip edge on eaves. (2 rows from eave). Thanks for the in depth roof replacement articles.

    • Bob Jackson September 13, 2016 at 7:55 am #

      Kickout flashing is galvanized sheet metal (steel). Sheet metal is ductile, easy to bend and form by hand without breaking.

      Drip edge flashing is aluminum and available in several colors.

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