Roofing/Covering Tar

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Expert: Bruce A. Ryan II, RRO - 10/21/2009


Question
Hi.
I have an old metal roof that has been patched many time.
I want to put elastomeric coat over the metal but understand that tar will seep through it. On the patched areas of tar, can I use a "metal" tape (the kind you use on metal ducts) to completely cover the tar? Will this keep the tar from seeping through the plastic coating?
If not, can you suggest what I can put over the tar before the plastic coating?
Thanking you so much.
Michele

Answer
Michele,

I would suggest using a metal roof coating such as Karnak 50 that is compatible with asphalt products.  If coal tar based wet patch has been used on your roof, then any coating is going to have problems.  You must remove it, clean.

Otherwise, consider replacing or recovering your metal roof.

Bruce Ryan II, RRO
Professional Roof Consultants, Inc.

Roofing

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Bruce A. Ryan II, RRO

Expertise

I offer solid knowlege of all types of Commercial and Residential Roofing, Waterproofing, and, Building Envelope systems. Experience ranges across low slope and steep slope roof systems. I am also well versed in matters regarding condensation and ventilation. I enjoy donating some of my time and knowledge to the betterment of others.

Experience

Bruce Ryan has 13 years of roofing, waterproofing, and building envelope consulting experience with PRC, with 5 years of commercial roofing experience prior to joining the firm. He became Vice President of the company in 1998. Bruce Ryan plays a key role in the development of practical, long-term roofing and waterproofing solutions, along with implementation of on-site forensic studies. Bruce also has a high level of experience with regard to the impacts of roofing materials and construction for demanding clients with heavily occupied structures.

Organizations
Oregon Construction Contractors Board Construction Specifiers Institute National Roofing Contractors Association The Institute of Roofing, Waterproofing, & Building Envelope Professionals Oregon Board of Investigators Installation Masters

Education/Credentials
University of Maryland BS Business & Administration Registered Roof Observer - RCI Private Investigator Certified EIFS inspector - Northwest Wall and Ceiling Bureau Certified InstallationMaster™ - The Installation Masters™ Training and Certification Program (developed by American Architectural Manufacturers Association)

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