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Interpretation #7095

Original Request

  • Date: October 24, 2012
  • Requested By: Jerry Peck
  • Requester E-Mail: jerrypeck@cfl.rr.com
  • Code Version: 2010
  • Code: RESIDENT
  • Code Description: Residential
  • Chapter: 9
  • Section: R905.2.8.5
  • Topic: Drip Edge

  • Question: Is it the intent of section R905.2.8.5 Drip Edge, to include or exclude gable/rake drip edge from this sentence: "If installed over the underlayment, there shall be a minimum 4 inch (51 mm) width of roof cement installed over the drip edge flange."

Answer on 10/24/2012 at 9:07 AM

The base code assumes that all metal
drip edge along the roof gables, rakes
and the eaves are applied over the
underlayment. See IRC or IBC Code
Commentaries. The manufacturer�s instructions or product
approval will provide the necessary
guidance for the drip edge metal at the
gables/rakes, as the referenced section
does not address the issue.

Commentary:

The intent of requiring a 4-inch width of roof cement over the drip edge flange, if the drip edge is installed over the underlayment, is a Florida Specific requirement. This requirement is not limited to any specific drip edge location. The reason for adding this Florida Specific requirement in the code was to provide an enhanced sealing of the roof shingles and improved wind resistance at a vulnerable location on the roof in Hurricane-Prone Regions. The eave drip edge and gable/rake drip edge are both located in the same higher turbulence wind zones on a roof (Zone 2 & Zone 3) and therefore require the same level of enhanced protection.