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Interpretation #7374

Original Request

  • Date: July 19, 2014
  • Requested By: John A. Jones, PE, CBO
  • Requester E-Mail: jjones@dartengineering.com
  • Code Version: 2010
  • Code: BUILDING
  • Code Description: Building
  • Chapter: 15
  • Section: 1502.1
  • Topic: Roof Tie-In terminology

  • Question: The definition of "roof section" discusses "the roof area required for a proper tie-off with an existing system". Is it the intent of this to mean a "roof tie-in", such as where a shingle roof terminates onto a low slope roof at the back of a house over a patio? This detail is typically referred to as a tie-in, not a tie- off.

Answer on 07/19/2014 at 4:56 PM

Yes. The same referenced Roof Section definition in chapter
15 using the term tie-off can be found in the 1994 South

Florida Building Code and has been in the Florida Building

Code since the 2001 version. The answer to the question is
that the roofing terms "tie-off" and "tie-in" are
synonymous. Either term would be appropriate for use in the
Roof Section definition when joining a new roof system to
an existing roof system. The term "tie-off" used in the
code is intended to mean the same as tie-in.

Commentary:

If considering a change from the upper to the lower roof section that would be a tie-off. If considering a change from a lower to upper roof section, that would be a tie-in. There is really no difference in the terms as applied to determine if the area is a roof section.