AboutBruce A. Ryan II, RRO Expertise Commercial/Residential Roofing Waterproofing Building Envelope
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)
Question QUESTION: Can anyone tell me the long term performance differences, pros/cons of Modified Bitumen (MP) vs Dura-Last?
I'm looking to replace a 31 yr old flat roof that currently has asphalt and gravel. The roof is approx. 1250 ft2
MP quote was $7K, Dura-Last was $8K. MP quote would put double membrane near flashing while Dura-Last would put ply over the roof and replace the flashing.
Any comments would be greatly appreciated. Thanks
ANSWER: Dan,
The old roof should be removed regardless of the system you choose. I do not see a whole lot of price difference and from your description, I am struggling to see an advantage or disadvantage of either system.
I will ask you this though, how long do you want the new roof to last? If you want it to be there for another 31 years, replace the old roof with a new one that is exactly the same. You will be lucky to get 20 years from the Duro-last. You may also be dissatisfied with the aesthetics of the single ply roof, so that should be considered as well.
I hope that helps,
Bruce Ryan II, RRO
Professional Roof Consultants, Inc.
---------- FOLLOW-UP ----------
QUESTION: Hi Bruce. Thanks for your response.
I would like the roof to last as long as possible with minimal negative effects from exposure to a bitter northern winter.
I've been asking and everyone has their own opinion.
The duro-last quote states a 3/8" duro-board will be fastened to the underlying deck. 50 mil duro-last will be fastened the surface of the duro-board. Seams will be hot air welded, no flame. All flashings will be replaced.
The mod.bit quote uses 4 mm APP Esha membrane, reinforced to 8mm at flashings and protrusions. A flood coat of hot asphalt will be added to resaturate the roof felts on the original roof. Damaged areas will be replaced by cutting through deck and replacing with foam insulation. No flash replacement.
As I have no roofing experience, any help would be greatly appreciated. As you mentioned, the price difference is comparable. As mentioned, I am looking for something that can withstand ice and snow.
If you need more info, I can scan and e-mail you the line per line description in each quote
Regards
Dan
Answer The Mod Bit system will be more durable now and over the long term. My point was that if you did not have to replace the asphalt built-up roof system for 31 years, why question it?
send me the quotes and we will go from there. bruce.ryan@professionalroofconsultants.com
