Factors to Consider in Developing Conceptual Scopes of Repair for Common Low-Slope Roofing Assemblies

Chad Williams; Drew Jamison

doi:10.51501/jotnafe.v40i2.820

Authors

Chad Williams Member
Drew Jamison Valiant Technical Services

DOI:

https://doi.org/10.51501/jotnafe.v40i2.820

Keywords:

Forensic Engineering, Commercial Roofing, Repair Reccomendations, Replacement Reccomendations, Repairability, roofs, roofing, conceptual scope of repair, roof sections, built-up roofing, modified-bitumen built-up roofing, ethics, feasible, feasibility, life safety, low-slope, single-ply

Abstract

Forensic engineers are commonly asked to develop conceptual scopes of repair as part of their work. Many factors impact these recommendations, including building codes, construction feasibility, manufacturer assessment, and installation requirements. In addition, the conditions present on and within the existing roof surfaces can limit the repairability of a commercial roof assembly such that removal and replacement of the entire roof section is the appropriate or only feasible repair option. This paper will focus on common limitations to be considered when developing a conceptual scope of repair for common commercial roof systems, including single-ply membranes, built-up roofing, metal panel roofing, spray polyurethane foam roofing, and the application/maintenance of roof coatings. It will also discuss an assessment methodology that can assist in developing a broader understanding of the condition of the roof surfaces.

References

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 101.2 Scope, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018/chapter-1-scope-and-administration.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 114.1 Unlawful Acts, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018/chapter-1-scope-and-administration.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 1503.1 Weather Protection – General, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018/chapter-15-roof-assemblies-and-rooftop-structures.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 101.3 General - Intent, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-1-scope-and-administration.

INTERNATIONAL EXISTING BUILDING CODE (IEBC) | ICC DIGITAL CODES, Section 101.3 General - Intent, 2018. [Online.] Available: https://codes.iccsafe.org/content/IEBC2018P4/chapter-1-scope-and-administration.

National Society of Professional Engineers | Code of Ethics, Section I - Fundamental Canons, July 2019. [Online.] Available: https://www.nspe.org/resources/ethics/code-ethics.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 202 Definitions – Roof Coverings, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-2-definitions.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 202 Definitions – Roof Assembly, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-2-definitions.

National Roofing Contractors Association. “Glossary – ‘Roof Assembly’.” NRCA.net. Accessed: Feb. 16, 2023. [Online.] Available: https://nrca.net/technical/glossary.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 202 Definitions – Roof Repair, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-2-definitions.

INTERNATIONAL EXISTING BUILDING CODE (IEBC) | ICC DIGITAL CODES, Section 202 Definitions – Roof Repair, 2018. [Online.] Available: https://codes.iccsafe.org/content/IEBC2018P4/chapter-2-definitions.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 202 Definitions – Roof Replacement, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-2-definitions.

INTERNATIONAL EXISTING BUILDING CODE (IEBC) | ICC DIGITAL CODES, Section 202 Definitions – Roof Replacement, 2018. [Online.] Available: https://codes.iccsafe.org/content/IEBC2018P4/chapter-2-definitions.

FLORIDA BUILDING CODE, EXISTING BUILDING, 7TH EDITION | ICC DIGITAL CODES, Section 202 General Definitions – Roof Section, 2020. [Online.] Available: https://codes.iccsafe.org/content/FLEBC2020P1/chapter-2-definitions.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 1511.3.1.1 Exceptions, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-15-roof-assemblies-and-rooftop-structures.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 1511.3 Roof replacement, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-15-roof-assemblies-and-rooftop-structures.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 1511.3.1.1 Exceptions, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-15-roof-assemblies-and-rooftop-structures.

INTERNATIONAL EXISTING BUILDING CODE (IEBC) | ICC DIGITAL CODES, Section 705.1 – General, 2018. [Online.] Available: https://codes.iccsafe.org/content/IEBC2018P4/chapter-7-alterations-level-1.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 202 Definitions – Positive Roof Drainage, 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-2-definitions.

INTERNATIONAL EXISTING BUILDING CODE (IEBC) | ICC DIGITAL CODES, Section 101.3 Intent, 2018. [Online.] Available: https://codes.iccsafe.org/content/IEBC2018P4/chapter-1-scope-and-administration.

INTERNATIONAL EXISTING BUILDING CODE (IEBC) | ICC DIGITAL CODES, Section 701.2 Conformance, 2018. [Online.] Available: https://codes.iccsafe.org/content/IEBC2018P4/chapter-7-alterations-level-1.

S. M. Verhulst, and T. G. Ebisch, “Foreseeable Failure: Roof Collapses and Roof Drainage Deficiencies,” ASCE Forensic Engineering 2022. [Online.] Available: https://doi.org/10.1061/9780784484548.007.

GAF. “Chemical Resistance An “Engineered” Approach.” https://www.gaf.com/. Accessed: Mar. 4, 2023. [Online.] Available: https://www.gaf.com/en-us/document-library/documents/ productdocuments/commercialroofingsystemsdocuments/pvcdocuments/pvcmembranesdocuments/pvcfleecebackdocuments/everguardpvc50fleecebackmembranedocuments/Guide__Chemical_Resistance_Guide_for_TPOPVC.pdf.

K. B. Fester, “Chemical consideration,” Professional Roofing Magazine., vol. 47, issue 11, Nov. 1, 2017. [Online.] Available:https://www.professionalroofing.net/Articles/Chemical-considerations--11-01-2017/4127.

Asphalt Roofing Manufactures Association, “Technical Bulletin - Potential Effects of Contaminants on Modified Bitumen Sheet Materials.” www.asphaltroofing.org Apr. 20, 2020. Retrieved March 4, 2023, [Online.] Available: https://www.asphaltroofing.org/the-effects-of-greases-oils-and-chemicals-on-modified-bitumen-sheet-materials/.

INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES, Section 1511.3.1 Roof recover Paragraph 4. , 2018. [Online.] Available: https://codes.iccsafe.org/content/IBC2018P6/chapter-15-roof-assemblies-and-rooftop-structures.

M. S. Graham, “Coating concerns - Building Code Compliance for Roof Coatings is Limited.” Professional Roofing, p, 24–25, Mar. 2019. [Online.] Available: https://www.nrca.net/Technical/PDF?id=175908&k=25444.