Hail Damaged Roof Replacement: Part 6 – Drip Edge Roof Flashing

Drip edge flashing is installed on the roof eaves and rakes to protect the fascia board, and to cover the “carpenter’s gap” between the roof deck and fascia to keep squirrels out of the attic. This project is continued from Hail Damaged Roof Replacement – Part 5.

Roof Drip Edge Flashing

5 x 2 inch drip edge flashing without a hem (i.e. no kickout) is installed along the roof eaves and nailed to the OSB roof deck. The drip edge hangs into to the gutter to protect the fascia board and roof deck from blowing rain and to better support the shingles.

Hail Damage Roof Repair: Eave Drip Edge Flashing into the Gutter

Roof Carpenter’s Gap

Carpenter’s Gap is the gap between roof deck and fascia board along the roof eaves. The carpenter’s gap on my home ranges from 3/4 inch to 1 inch. I’ve seen carpenter’s gaps as wide as 2 inches on some homes.

Carpenter’s Gap between the Roof Deck and Fascia Board

The carpenter’s gap is a big problem for the following reasons:

  1. Squirrels and rodents will either wiggle through the gap to nest in the attic insulation or gnaw a hole large enough to get in, particularly when the weather gets cold in the Fall and Winter. Without a drip edge, homeowner’s often hire a critter removal or gutter company to install a heavy metal mesh over the carpenter’s gap.
  2. The starter course shingles must hang over the roof edge by several inches such they droop over the carpenter’s gap into the gutter to keep out rain. This looks bad and causes the shingles to crack.
    By contrast, shingles are normally installed with a 1/4 inch to 3/4 inch overhang past the eave or drip edge.
  3. Leaves and debris are blown into the soffit and attic when using a leaf blower to clean out the gutters.

Roof Eave Drip Edge Flashing

The GAF Shingle-Mate® roofing felt is laid over the drip edge flashing along the eaves. (The red chalk lines are for laying the shingles.)

Hail Damaged Roof Replacement: Roof Felt on the Eave Drip Edge Flashing

A closeup of the roofing felt and how the drip edge flashing hangs into the gutter:

Hail Damage Roof Replacement: Roof Felt and Eave Drip Edge Flashing

Roof Rake Drip Edge Flashing

Drip edge flashing with a hem (or kickout) to direct water away from the fascia board is installed over the roofing felt along the roof rakes. Also notice the roof brackets are always set under the roofing felt (and shingles) so there are no holes in the roof covering. BTW – the “rake” is the sloped edge of a roof that runs from the eaves to the roof ridge.

Roof Rake Drip Edge Flashing

The drip edge flashing kickout (or hem) is clearly visible on the rakes of this roof gable. The kickout keeps water from dribbling down the fascia board.

Roof Drip Edge Flashing with Kickout (Hem) on the Roof Rakes

Closeup of the roof rake drip edge flashing and the GAF Pro-Start™ starter strip shingles:

Roof Rake Drip Edge Flashing and GAF Pro-Start Starter Shingles

Shingles going up the gable roof with details of the rake drip edge flashing and starter strip shingles. Notice the line of adhesive on the starter strip shingles to seal the shingles to resist wind blow-off.

Roof Gable Shingles, Starter Strip Shingle and Rake Drip Edge Flashing Installation

Eave and rake drip edge flashing details at the roof corner:

Roof Drip Edge Flashing – Eave and Rake Corner Detail

This hail damage roof replacement series is continued in Hail Damaged Roof Replacement – Part 7.

Take care,

Bob Jackson

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2 Responses to Hail Damaged Roof Replacement: Part 6 – Drip Edge Roof Flashing

  1. Daniel January 22, 2015 at 11:13 am #

    Love your website. This is what makes the internet so great. After reading this post I was curious as to the purpose of the carpenter’s gap was. I did some searching and didn’t find much. Do you have any ideas?


    • Bob Jackson January 22, 2015 at 12:44 pm #

      A small carpenter’s gap is normal due to different angles between the roof deck and fascia board while allowing room for expansion. IMHO the large gap on my home is lack of attention to detail – note how the fascia board doesn’t cover the entire rafter tail.

      The carpenter’s gap isn’t an issue if covered with drip edge flashing.

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