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Tremco Roofing and Building Maintenance
J157
Roof Preservation:
A Sustainable Option
TRM029
Steven L. Hughes, AIA LEED AP –Architect
Michael Boudreau – Senior Field Advisor
18 March 2014

“RPM Building Solutions Group is a Registered Provider with The American Institute of
Architects Continuing Education Systems. Credit earned on completion of this
program will be reported to CES Records for AIA members. Certificates of Completion
for non-AIA members are available on request.
This program is registered with the AIA/CES for continuing professional education. As
such, it does not include content that may be deemed or construed to be an approval
or endorsement by the AIA of any material of construction or any method or manner of
handling, using, distributing, or dealing in any material or product. Questions related to
specific materials, methods, and services will be addressed at the conclusion of this
presentation.
AIA/CES

Learning Objectives:
At the end of the program, participants will be able to:
 Identify sustainable roof preservation materials and methods
when researching roof preservation solutions.
 Provide multiple surface treatment possibilities available for
roof restoration when writing roofing specifications.
 Discuss multiple types of roofing systems that can successfully
be preserved and restored during the evaluation of roof
systems.
 Understand the safety, economic and environmental benefits of
roofing preservation in comparison to roof replacement.

“ Capable of being continued with minimal
long-term effect on the environment.”
American Heritage Dictionary
preservation
“To keep in a sound state.”
New Webster’s Dictionary
TERMS

Roof Preservation: A Sustainable Option:
“ Keeping existing roofs in a sound and
waterproof state, capable of being
continued for years with minimal long term
effect on the environment.”

The Wasteful Truth
Millions and millions of square feet of
dry, sound, serviceable,
commercial/industrial/educational/healthcare
roofing is torn off,
and millions of tons of debris are dumped into
landfills every year that:
DOES NOT NEED TO BE REPLACED!

Instead of Preserving their roofs, why do
people replace their roofs?
 The roof leaks (for a variety of reasons)
 The roof is old (20 year assumed lifetime)
 Contractors tell them they need to be replaced
 Roof insulation is substandard
 Standard Policy at a specific age
 Funding is available: just do it
 Most people are NOT aware of their options

 Existing roofs have been being preserved
for well over 100 years with time-tested
preservation methods.
 Re-surfacing
 Re-saturants
 Has been traditionally limited to coal tar
and asphalt built-up roofing

What types of roofing systems lend themselves
to a “sustainable preservation” solution?

• Hot & Cold applied built-up roofing (BUR)?
YES!

• Modified (SBS or APP) Bitumen
Cold Adhesive, Hot or Torch Applied Systems
YES!

• Fully adhered single ply membranes
EPDM, PVC, TPO, Hypalon, etc.
YES!

• Metal roofing systems
YES!

• How about this roof system?
NO!

How can you determine what can be
preserved and what can not?
• By performing thorough, professional,
in-depth inspection using the best
diagnostic tools available…conducted by
very experienced & qualified personnel.

What diagnostic tools?
• Visual deck inspection

• Visual roof surface
inspection

• Moisture meter testing

• Roof core sampling & analysis

• Asbestos testing by qualified laboratories

• Membrane strength test required for BUR
200 lbf/in. min

• Infrared scanning & verification

• Adjacent masonry inspections

• Other roof-connected concerns

What are the GOALS of these inspections?
• Qualify the roof as a candidate for
Preservation
• Determine why the roof leaks to avoid same
problems in the future
• Select the appropriate, sustainable,
preservation option

If the inspection process green lights the roof for
preservation, how is it actually done?
• Different roof types require different preservation
systems and different application techniques
• Different approaches may be required for gravel-
surfaced BUR / granulated Modified Bitumen / fully
adhered single ply systems or metal roofing systems.

But, the preliminary preservation process
steps are usually the same for all systems:
Steps:
 Visual roof deck inspection
 Visual roof surface inspection
 Moisture meter testing (wet or dry insulation)
 Roof core sampling
 Infrared scanning & analysis
 Removal of wet insulation & damaged decking
 Replacement (infill & repair) of existing roofing in-
kind

Preliminary work has been completed…your
Sustainable Roof Preservation project can begin!
• Removal of wet insulation (perhaps damaged decking)
• Replacement (infill & repair) of existing roofing in-kind

Preparation of existing roof surface
• Vacuuming (wet) of gravel or granulated surfaces
• Mechanical sweeping of gravel surfaces
• Power washing of single ply surfaces
• Power washing of metal roofing surfaces

Pre-project preservation work
• Masonry repair
• Additional drain installation or repair
• Equipment removal or addition
• Base flashing height adjustment (curbs, windows, doors, walls)
• Existing penetration detail upgrades

• Replace flashings
• Reinforce seams
• Reinforce identified defects
• Correct Drainage Issues
• Prime surfaces as required
Repairing & Preparing
roof surface for preservation

Installation of a new
weathering surface
 Gravel surfaced BUR
New cold process
adhesive flood coat &
embedded aggregate

weathering surface
 Granule-surfaced Mod-Bit
Polyurethane
Acrylic
Fibrated aluminum

weathering surface
 Single Ply Membranes
EPDM, PVC, TPO, CSPE
Polyurethane
acrylic

weathering surface
 Metal Roofing
Acrylic
Fibrated aluminum
Kynar

Code Advantages of Roof Preservation
Re-roofing is considered repair or alteration as
defined by 2009 IBC Chapter 15 would fall under
one of the following categories:
Roof Replacement - removing existing and
replacing with new.
Roof Repair - renewal of any part of an existing
roof for maintenance
Roof Recovering - installing a new roof over an
existing roof system.
Other than Roof Repair, Re-roofing does not fall under the category of
"ordinary repairs", but would be considered alteration or new construction
depending on the extent of work. This means compliance with code for new
construction for issues such as Chapter 15 design, as well as compliance with
Energy Code for minimum insulation R-Value requirements.

Advantages of Sustainable Roof Preservation
• Sustainable roof preservation can be very economical
 Typically 33% to 50% of the cost of replacement
• Significantly reduced material quantity goes to local landfill
• Existing insulation $$$$ & R-Value are preserved (re-used in
the system)
• Inside operations continue with lessened construction
disturbance (faster project completion times = less time on
site = lower open roof risk)
• Contractor-friendly (compared to a full tear off)
• New weathering surface can be highly reflective
• Long term warranties are available
• State fund contributions vary by state and locale

This concludes The American Institute of Architects
Continuing Education Systems Course
Copyright Materials
This presentation is protected by US and International Copyright laws.
Reproduction, distribution, display and use of the presentation without
written permission of the speaker is prohibited.
© Tremco 2013
© 2013 Tremco

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Amity CT Regional High School Restoration

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