This Online Learning Seminar is
available through a professional
courtesy provided by:
Single-Ply Commercial Roofing
GenFlex Roofing Systems
1722 Indian Wood Circle
Maumee, OH 43537
Tel: 419-891-4402
Fax: 419-891-4437
Toll-Free: 1-800-443-4272
Email: [email protected]
Web: www.genflex.com
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© 2004 GenFlex Roofing Systems. The material contained in this course was researched, assembled,
and produced by GenFlex Roofing Systems a business of OMNOVA Solutions Inc. and it remains the
property of OMNOVA Solutions Inc. Questions or concerns about the content of this course should be
directed to the program instructor.
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Slide 1 of 47
• About the Instructor
• About the Sponsor
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Single-Ply Commercial Roofing
Single-Ply Commercial Roofing
Presented By:
Jim Burkett
GenFlex Roofing Systems
1722 Indian Wood Circle
Maumee, OH 43537
Description:
Provides an overview of single-ply products available in
the commercial roofing market, including advantages and
disadvantages of different roofing types, generic application
techniques, types of insulation, and construction details.
AIA/CES Info:
Provider No. J624 – Course No. AEC019; LUs – 1.00
MCE Info:
Contact your respective governmental licensing & regulatory
agency. This program qualifies for HSW credit.
Expiration date:
July 31, 2005
This program is registered with AIA/CES for continuing professional registration. As such, it does not include content that may be deemed
or construed to be an approval or endorsement by the AIA or AEC Daily Corporation of any material or 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 should be directed to the program instructor.
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©2004
Slide 2 of 47
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Single-Ply Commercial Roofing
How to use this Online Learning Course
•
Read and review the material contained in this seminar.
•
Some slides may contain additional Instructor comments. To view these
comments, double-click on the
icon. Then, click on the comment window to
scroll through the text.
•
To view this presentation, use the previous/next keys on each slide or the up and
down arrow keys on your keyboard.
•
Within this course is a code word that you will be required to enter in order to
proceed with the online examination. Please be sure to write down this code
word so that you have it available for the test.
•
To receive a certificate indicating course completion, refer to the instructions at
the end of the seminar.
•
For additional information and post-seminar assistance, click on any of the logos
and icons within a page or any of the links at the top of each page.
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Slide 3 of 47
• About the Instructor
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Single-Ply Commercial Roofing
Learning Objectives
Upon completing this course, you will have a better understanding of:
•
Current and future market trends in low-slope commercial roofing products
•
Various single-ply products available in today’s commercial roofing market
•
EPDM roofing membranes, their features, benefits and installation details
•
PVC & Thermoplastic membranes, their advantages and installation details
•
Types of insulation commonly used in low-slope roofing applications
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Slide 4 of 47
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Commercial Low-Slope Roofing Market
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Slide 5 of 47
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Single-Ply Commercial Roofing
Commercial Low Slope Roofing Market
The commercial low slope roofing market
can be broken down into two segments:
•
Asphalt Market: The asphalt market is
made up of hot or cold asphalt, or
modified asphalt products, including:
•
•
•
EPDM
25%
Modified Bitumen (Mod. Bit.)
Built-up Roofing (BUR)
Single-Ply Market: The single-ply market
consists of polymer-based products in two
general categories:
•
•
BUR
23%
Mod. Bit.
32%
Figure 1: This graph shows the 2003
market share of different types of
commercial low slope roofing systems
by square feet.
Thermoset (EPDM)
Thermoplastic (PVC & TPO)
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T-Plastics
20%
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Slide 6 of 47
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Single-Ply Commercial Roofing
Commercial Low Slope Roofing Market
22%
Market influences have helped single-ply
products increase their market share:
•
•
•
Cost & Performance
Single-ply systems require less labor and provide
excellent long-term performance. They also can
be safer to install than asphalt systems, e.g., no
open flames.
Energy Efficiency
Reflective thermoplastic white roofs, or cool
roofs result in lower energy costs and often
qualify for government rebates and incentives.
7%
4%
2%
Bur
EPDM
Mod.
Bit.
PVC
TPO
Figure 2: This graph shows the market
growth in square feet of various types
of asphalt and single-ply roofing
systems from 2002 to 2003.
Environmental Concerns
Single-ply systems eliminate asphalt fumes and
reduce emissions of volatile organic compounds
(VOCs).
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7%
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Slide 7 of 47
• About the Instructor
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Single-Ply Commercial Roofing
Commercial Low Slope Roofing Market
Within the single-ply market, EPDM has
experienced a decline in market share, while
the market for thermoplastics has grown.
1200
1000
EPDM
• Market share is being lost to thermoplastics
• Black EPDM lacks high reflectivity
• Installed costs are now higher (MAS)
800
Thermoplastics
• Provide lower installed costs than EPDM
• Reflective membranes (White/Tan/Grey)
• White membrane is EnergyStar® compliant
• Product growth has created “momentum”
• Possesses market “momentum”
0
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600
400
200
1995
1997
T-Plastic
1999
2001
2003
EPDM
Figure 3: This graph shows the market
trends for single ply in square feet.
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Slide 8 of 47
• About the Instructor
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Single-Ply Commercial Roofing
Commercial Low Slope Roofing Market
Excellent performance, lower installed
costs, and environmental considerations
are expected to continue to support the
growth of thermoplastics over all other
types of commercial low slope roofing
systems.
T-Plastics
24%
EPDM
24%
BUR
18%
Mod. Bit.
34%
This graph shows the estimated market
share of various commercial low slope
roofing systems in 2007 by square feet.
Please remember the word BALLAST. You will be required to enter it in order to proceed
with the online examination.
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Slide 9 of 47
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Single-Ply Commercial Roofing
Single-Ply Commercial Roofing
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Slide 10 of 47
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Single-Ply Commercial Roofing
Single-Ply Commercial Roofing
Single-ply commercial roofing can be broken down into two general categories:
Thermoset (EPDM)
Thermoset roofing, such as EPDM, consists of rubber membranes that have been permanently
cured or hardened using a process of vulcanization where the rubber is exposed to heat, steam
and pressure. Seams are typically assembled using tapes or adhesives. Standards are covered by
ASTM D4637-03 “Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane”.
Thermoplastic (PVC, PVC Blends, TPO)
Thermoplastic systems, such as PVC or TPO, consist of membranes made from plastics (e.g. vinyl,
olefin) that repeatedly soften when heated and harden when cooled. Seams and membranes can
be heat welded at any time during the service life of the product. Standards are covered by
ASTM D4434-96 “Standard Specification for Poly (Vinyl Chloride) Sheet Roofing” and ASTM
D6878-03 “Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing”.
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Slide 11 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
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Slide 12 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
Introduction
•
EPDM (Ethylene Propylene Diene Monomer) roofing systems are designed for durability and
can withstand extreme environmental exposure. The majority of EPDM membranes are
black and provide excellent resistance to ultraviolet and heat degradation.
•
EPDM membranes can be installed either ballasted, fully adhered, or mechanically attached,
and are suitable for both new construction and re-roofing. EPDM is a high performance
membrane that is resistant to tears, impacts, punctures and normal roof traffic.
•
EPDM is available in rolls up to 50‘ wide x 100‘ feet long, in 45 mil or 60 mil thicknesses,
standard or reinforced. In the field, EPDM panels are spliced together using either two sided
adhesive tapes or liquid splice adhesives.
•
Over the past several decades, roofing contractors have increased their knowledge of EPDM
and the key installation elements required for long-term installations.
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Slide 13 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
History
There have been many advances made in EPDM
technology since it was first introduced in the 1960s.
Membrane Type
Year
Standard Unreinforced
1960s
Standard Fire Retardant
1983
Reinforced
1986
Seam Tapes
1987
Reinforced Fire Retardant
1994
Source: NRCA Low Slope Material Guide
Today, both cured and uncured EPDM flashings and
pre-molded EPDM accessories are readily available.
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Slide 14 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
System Types & Trends
EPDM trends have changed substantially over the past several decades due to the introduction
of new types of membranes (e.g. reinforced, fire retardant) and lower installed costs.
System Type
1980
1997
2003
Ballasted
90%
50%
40%
Fully Adhered
5%
30%
42%
Mechanically Attached
5%
20%
18%
100%
90%
80%
0%
10%
20%
Unreinforced
Reinforced
In the early 1980s, when EPDM was new, ballasted systems were by far the most common and
only un-reinforced membranes were available. Today, reinforced membranes are becoming
more common, along with fully adhered and mechanically attached systems.
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Slide 15 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
Ballasted Systems
This system is preferred for installations where speed and
economy are prime considerations. Both the insulation
(Isocyanurate or Extruded Polystyrene) and membrane can
be loose laid with the membrane fastened only at the
perimeter. EPDM membranes are typically available in
45 mil or 65 mil thickness, non-reinforced or reinforced.
Advantages
• Large 50’ x 200’ panels speed installation, lower costs
• Layer of ballast protects membrane from elements
Disadvantages
• Only suitable for substrates capable of supporting
a minimum dead load of 10 lbs of ballast/sq. ft.
• Ballast makes it difficult to find source of leaks
Previous
©2004
Ballasted EPDM roofing systems
comprise 40% of all EPDM roofs.
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Slide 16 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
Fully Adhered Systems
Fully adhered systems install with a continuous, even
surface and require no mechanical penetration of the
membrane. Membranes are available in 16’-8” panels and
should be 60 mil, standard or reinforced. Solvent/water
based or contact adhesives are applied to both the
substrate and the membrane.
Advantages
•
Best EPDM system, excellent performance in high
winds, seams experience less peel and shear forces
•
Exposed membrane makes it easier to find leaks
•
Lightweight system adds minimal weight to deck
Fully adhered EPDM systems
comprise 42% of all EPDM roofs.
Disadvantages
•
Slightly more expensive than ballasted system
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Slide 17 of 47
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• Seminar Discussion Forum
Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
Mechanically Attached Systems
Mechanically anchored or attached systems utilize
fasteners and plates, or polymer or metal bars installed
through the membrane and into the deck. Bar-in-Seam
systems place the fastening devices within the seam area
in order to create a non-penetrating membrane system.
Bar Anchor Tape systems utilize fastening devices that
screw through the field of the membrane and are covered
with self adhering cover tapes. EPDM membranes are
available in 6’6” or 7’6” panels, standard or reinforced.
Advantages
•
Exposed membrane makes it easier to find source
of leaks and repair membrane as necessary
•
Moderate cost as compared to ballasted systems
•
Lightweight system adds minimal weight to deck
Previous
©2004
Mechanically attached EPDM systems
comprise 18% of all EPDM roofs.
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Slide 18 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
Seam Techniques
Primer
(Red)
Butyl Tape
(Grey)
Ballasted & Fully Adhered
For ballasted and fully adhered EPDM systems,
seams will consist of overlapped areas in which
primer and seam tape products are used
to splice or hold the panels together. Properly
installed EPDM seams are as strong as the
membrane itself.
Mechanically Attached
Mechanically attached systems utilize a nonpenetrating seaming method, where fasteners
and plates are contained within the seam area.
Uplift pressures place the seam in a shear mode
that is very strong. System performance depends
on the strength of the fastener. Failures usually
occur between the fastener and the metal deck, not
within the membrane.
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Seam in Shear Mode
Uplift
Pressure
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Slide 19 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
Features & Benefits
•
Weather Resistance
EPDM is very resistant to external weathering due to
its chemical makeup and cross-linked structure.
•
Stress Resistance
EPDM membranes can expand and contract in
response to building movement or thermal changes.
•
Heat Aging Resistance
EPDM’s chemical makeup and cross-linked structure
give it increased resistance to heat aging.
•
Thermal Resistance
EPDM has outstanding flexibility at low temperatures
(-58°F), yet is very stable at temperatures above 200°F.
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Slide 20 of 47
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Single-Ply Commercial Roofing
EPDM Single-Ply Membranes
What makes EPDM roofs perform?
•
Improved Products & Accessories
EPDM membranes are inherently resistant to weathering and do not require additives in
order to enhance performance. Modern butyl splice adhesives and tapes perform better
than earlier neoprene products. Flashings and perimeters also have improved from earlier
wood nailers to metal anchored and RPS strips.
•
Crew Training & Inspection Techniques
In many cases, roofing crews must take part in mandatory training offered by various
corporate training centers. Many manufacturers also offer in-field training programs.
•
Increased Contractor Knowledge & Commitment
After more than 30 years in the marketplace, there is broad contractor knowledge of EPDM
systems and applications. Today, there is increased contractor partnership and commitment
with incentives based on quality of installation and long-term roof performance.
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Slide 21 of 47
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Single-Ply Commercial Roofing
EPDM Roofing – Seam Tape Detail
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Slide 22 of 47
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Single-Ply Commercial Roofing
EPDM Roofing – Mechanically Attached Seam Detail
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Slide 23 of 47
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Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
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©2004
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Slide 24 of 47
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Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Introduction
•
Hot air welded thermoplastic roofing membranes are the fastest growing segment of the low-slope roofing
market. Thermoplastic roofing systems are designed for durability and can withstand extreme
environmental exposure with excellent resistance to extreme environmental exposure including UV and
heat degradation.
•
PVC (Poly Vinyl Chloride) membranes possess inherent fire resistant characteristics, heat-welded seams and
historical performance. PVC membranes consist of a variety of polymers and modifiers, however most PVC
membranes utilize a plasticizer based PVC formulation.
•
TPO (Thermoplastic Polyolefin) membranes provide the proven weather resistance of rubber (derived from
its high ethylene propylene rubber content) and the superior performance of heat-welded seams.
•
Membranes are available in 6’, 8’, 10’ and 12’ widths, in white, tan, grey or custom colors. Nominal
thicknesses are 45 mil or 60 mil, standard or reinforced. Standard, reinforced, or self-adhering TPO flashings
and pre-molded, self-adhering TPO accessories are readily available.
•
White Thermoplastic “Cool Roofs” can reduce energy consumption and problems associated with urban
heat islands, such as heat buildup, smog and air pollution. Cool roofs deliver high solar reflectivity (65 or
higher) and high emissivity (80% or higher) which reduces electrical demand and improves building
comfort.
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Slide 25 of 47
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
History
Developed in Europe, the first PVC membranes were
thin and unreinforced. When these membranes were
used in the U.S. in the 1970s, their performance was
poor and resulted in a “shattering” phenomenon.
Membrane Type
Year
PVC membranes (Europe)
1960s
PVC membranes (U.S.)
1970s
PVC Reinforced, blends, thicker
1980s
TPO membranes
1990s
PVC membrane performance improved dramatically
in the mid-1980s, with the introduction of thicker,
reinforced PVC blends. Thermoplastics are the latest
innovation in PVC membranes.
Previous
©2004
Heat welding equipment is used to fuse
seams together on a white TPO “Cool Roof”.
Next
Slide 26 of 47
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Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Terminology
•
PVC (Polyvinyl Chloride): A blend of PVC and a liquid plasticizer.
•
TPA (Thermoplastic Alloy): A blend of PVC and a solid plasticizer.
•
EIP (Ethylene Interpolymer): A specific blend of PVC, Ethylene & Elvaloy.
•
NBP (Acrylonitrile Butadiene Polymer Blend): A specific blend of PVC & Nitrile Rubber.
•
CPA (Copolymer Alloy): A specific blend of PVC and Acrylic Resin.
•
TPO (Thermoplastic Polyolefin): A blend of Polypropylene and Ethylene Propylene.
Don’t be confused—all of these membranes are PVC based, except TPO.
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Slide 27 of 47
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• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
System Types & Trends
Thermoplastic trends have remained relatively
constant over the past 20 years. Mechanically
attached systems tend to be the most common
due to the traditionally narrow 6’ widths.
100
TPO Membrane Widths
80
6'
8'
10'
12'
60
System Type
1980
1997
2001
Ballasted
0%
0%
2%
Fully Adhered
5%
9%
15%
95%
91%
83%
Mechanically Attached
With the development of 8’, 10’ and 12’
panels, fully adhered systems are becoming
more popular due to the lower installed costs
associated with the use of wider panels.
Previous
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40
20
0
1997
1998
1999
2000
Figure 4: This graph shows the increased
use of wider TPO panels (8’, 10’, 12”) over
the past several years.
Next
Slide 28 of 47
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• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Reflectivity & Emissivity
Reflectivity refers to a membrane’s ability to
reflect solar energy. Membranes with high
reflectivity will reflect more solar energy than
they absorb, resulting in a reduction in interior
heat gain. Periodic cleaning may be required
to maintain reflectivity.
Exterior
Heat Gain
(Emissivity)
Emissivity refers to a membrane’s ability to
reradiate heat energy. Membranes with high
emissivity will radiate away most of the solar
energy they absorb.
Interior
Heat Gain
TPO membranes are available in white, tan and
grey, which are all relatively reflective. Custom
colors are also available, however they require
longer delivery cycles and added costs.
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Solar Energy
Reflected
(Reflectivity)
White
80%
Interior
Heat Gain
Tan
40%
Grey
50%
Next
Slide 29 of 47
• About the Instructor
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• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Ballasted Systems
This system is preferred for installations where speed and
economy are prime considerations. Both the insulation
and the membrane can be loose laid with the membrane
fastened only at the perimeter. The weight of the ballast
holds the membrane in place, making it effective in high
wind situations.
Advantages
• Heat-welding provides significant seam strength
• Lowest installed cost, suitable for re-roof applications
Disadvantages
• Ballasted surface is not very reflective (only 25%)
• Ballast makes it difficult to find source of leaks
Previous
©2004
Ballasted TPO roofing systems
comprise only 2% of all TPO roofs as of 2003.
Next
Slide 30 of 47
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Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Fully Adhered Systems
Fully adhered systems install with a continuous, even
surface and require no mechanical penetration of the
membrane. TPO membranes can be adhered to the
insulation below using solvent or water-based adhesives,
or new self-adhering products. Fully adhered systems
are economical to install, and are suitable for recover or
re-roof applications.
Advantages
•
Heat welding provides significant seam strength
•
Lightweight system adds minimal weight to deck
•
Light colored membranes offer high reflectivity &
emissivity
•
Excellent performance under high wind conditions
•
Exposed membrane makes repairs quicker and easier
Previous
©2004
Fully adhered TPO systems
comprise 15% of all TPO roofs as of 2003.
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Slide 31 of 47
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Self-Adhering Systems
Self-Adhering membranes are the latest advancement in
fully adhered TPO technology and are responsible for the
recent market growth of fully adhered TPO systems.
Because the adhesive is factory-applied, these systems are
much easier and safer to install, and result in reduced fumes
and VOCs. Seams can be taped or heat-welded for added
durability.
Advantages
•
Heat welding provides significant seam strength
•
Lightweight system adds minimal weight to deck
•
Light colored membranes offer high reflectivity &
emissivity
•
Contractor friendly, with fewer products & less labor
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Slide 32 of 47
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Mechanically Attached Systems
Mechanically anchored or attached systems utilize
fasteners and plates, or polymer or metal bars installed
through the membrane and into the deck. Bar-in-Seam
systems place the fastening devices within the seam area
in order to create a non-penetrating membrane system.
Mechanically attached systems are the most commonly
installed type of thermoplastic roof.
Advantages
•
Heat welding provides significant seam strength
•
Lightweight system adds minimal weight to deck
•
Light colored membranes offer high reflectivity &
emissivity
•
Excellent performance under high wind conditions
Previous
©2004
Mechanically attached TPO systems
comprise 83% of all TPO roofs as of 2003.
Next
Slide 33 of 47
• About the Instructor
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• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Heat-Welded Seams
Because thermoplastic membranes can be heat
welded, seams can be assembled relatively quickly
with approved heat welding equipment.
Heat
Welded
Seam
Screw &
Plate
For single heat-welded seams, fasteners and plates
are installed through the membrane assembly and
into the deck. Adjacent panels of membrane are
overlapped by approximately 1-1/2” to 2” and then
heat welded.
Seam in Peel Mode
When the membrane is exposed to uplift pressures,
the seam area will be placed in a peel mode. This
peeling action requires the seams joining the two
membranes to be very strong. System performance
will depend on seam strength.
Previous
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Uplift
Pressure
Next
Slide 34 of 47
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• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Roofing – Mechanically Attached Seam Detail
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©2004
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Slide 35 of 47
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Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Heat-Welding Equipment
Seams in thermoplastic membrane systems can be
heat-welded using two types of equipment. A hand
welder is typically used to weld small seam areas
and flashing details. This type of unit is lightweight
and easy to handle.
Automatic welders or walker welders are larger,
heavier units used to weld long continuous seam
areas. They are designed for speed and accuracy.
Some units are capable of producing dual heatwelded seams.
Note: Test welds should be conducted frequently
using membrane scraps to confirm that the
welding equipment is properly set up.
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Slide 36 of 47
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
Features & Benefits
•
Weather Resistance
Membranes are very resistant to external weathering
as a result of their chemical makeup and reflective
surfaces.
•
Stress Resistance
Membranes can expand and contract in response to
building movement or thermal changes.
•
Aesthetics
Membranes are available in reflective white, tan, and
grey, in addition to a variety of custom colors.
•
Performance
Membranes and systems provide excellent
performance, with warranties of up to 20 years
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Slide 37 of 47
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Single-Ply Membranes
What makes PVC & TPO roofs increasing popular?
•
Lower Installed Costs
PVC and TPO membranes are now available in panels up to 12’ wide. Wider panels mean
fewer seams, less labor and ultimately lower installed costs. The use of high-tech heat
welding equipment also means that seams are quicker and safer to assemble.
•
Environmental Issues
White thermoplastic cool roofs can result in dramatic energy savings by reflecting solar
energy and reducing interior heat gains. New self-adhering fully adhered systems are also
eco-friendly because factory-applied adhesives reduce VOC emissions and fumes at the job
site.
•
Increased Contractor Knowledge & Acceptance
Roofing contractors have excellent knowledge of PVC and TPO systems, equipment and
applications. Today’s PVC and TPO membranes are stronger and thicker than ever before,
and are being widely used by companies across the country.
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• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Single-Ply Commercial Roofing
Thermoplastic Roofing - Base Flashing Detail
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Single-Ply Commercial Roofing
Thermoplastic Roofing – Fully Adhered Seam Detail
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Single-Ply Commercial Roofing
Commercial Roofing Insulation
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Single-Ply Commercial Roofing
Commercial Roofing Insulation
Insulation Types & Applications
There are several types of insulation that are commonly used in low slope roofing applications.
As shown, wood fiberboard can be used with both single-ply and asphalt roofing systems.
Insulation Product
Single-Ply
BUR
Mod. Bit.
Polyisocyanurate
Y
N
N
Extruded Polystyrene
Y
N
N
Expanded Polystyrene
Y
N
N
Wood Fiberboard
Y
Y
Y
Perlite
N
Y
Y
Perlite, on the other hand, can only be used in conjunction with asphalt systems. Although a
number of insulation materials, including polystyrene and wood fiberboard, can be used with
single-ply systems, the most common is Polyisocyanurate (ISO).
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Single-Ply Commercial Roofing
Commercial Roofing Insulation
Installation
Roof decking can be nailable (i.e. wood, gypsum,
etc.) or non-nailable (i.e. metal, concrete). Metal
decking represents about 65% of all low slope
roofing applications. A typical application directly
over a metal deck would include the following steps:
1.
2.
3.
Top Flute Penetration
(New Construction)
Loose lay the insulation over the deck.
Fasten the insulation to the deck with an
approved fastener & plate.
Install single-ply membrane system directly
over the insulation in accordance with
manufacturer requirements.
Penetration
Deck Type
Metal
Note: FM requires the fastener to penetrate the top
flute of the metal deck and also penetrate the deck
a min. depth.
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Depth
3/4"
Concrete
1"
Wood (3/4" Min.)
1"
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Commercial Roofing Insulation
Attachment
Insulation boards should be staggered, tightly fitted
and fastened to the acceptable deck. Fasteners and
plates shall be fastened to an approved substrate as
per manufacturers recommendations.
Typical Fastening Patterns
Mechanically Fastened Systems – 5 per board (4’ x 8’)
Fully Adhered Systems – 16 per board (4’ x 8’)
Ballasted Systems – Loose Laid (No Fasteners)
Note: The use of “stand-up tools” can speed up the
installation of fasteners and plates.
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Single-Ply Commercial Roofing
Commercial Roofing Insulation
Points to Remember
•
Polyisocyanurate insulation should not be
torched or mopped directly without a cover
board or base sheet.
•
Extruded or expanded polystyrene insulation
will require cover boards for fully adhered
singly-ply systems and hot asphalt or torch
systems.
•
Perlite insulation requires a cover board under
single-ply roofing systems.
•
NRCA recommends a cover board over
Polyisocyanurate for fully adhered single-ply
systems to address installation issues. Most
manufacturers do not require a cover board.
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Single-Ply Commercial Roofing
In Conclusion
White Thermoplastic Roofing System
The growth of thermoplastics is expected to continue over
all other types of commercial low slope roofing systems.
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Conclusion of This Program
•
AEC Daily Corporation is a Registered provider with the
AIA Continuing Education Systems. Credit earned upon
completion of this program will be reported to CES
Records for AIA members.
•
If you desire AIA/CES, CSI and/or state licensing
continuing education credits, please click on the button
below to commence your online examination. Upon
successful (80% or better) completion of the exam,
please print your Certificate of Completion.
•
For additional knowledge and post-seminar assistance,
please visit the Seminar Discussion Forum (click on the
link above and bookmark it in your browser).
•
If you have colleagues that might benefit from this
seminar, please let them know. Feel free to revisit the
AEC Daily web site to download additional programs
from the Online Learning Center.
©2004 GenFlex Roofing Systems. The
material contained in this course was
researched, assembled, and produced by
GenFlex Roofing Systems, a business of
OMNOVA Solutions Inc. and remains the
property of OMNOVA Solutions Inc.
Questions or concerns about this course
should be directed to the instructor.
Click Here To Take The Test
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