This Online Learning Seminar is
available through a professional
courtesy provided by:
Walkable Roof Deck Membranes
Duradek Ltd.
1722 Iron St.
North Kansas City, MO 64116
Tel: 816 421-5830
Fax: 816-421-2924
Toll-Free: 800-338-3568
8288 - 129th Street
Surrey, B.C. V3W 0A6
Tel: (604) 591-5594
Fax: (604) 591-3100
Toll-Free: 800-338-3568
Email: [email protected]
Web: www.duradek.com
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©2005 Duradek Ltd. The material contained in this course was researched, assembled, and
produced by Duradek Ltd. and remains their property. Questions or concerns about the content of
this course should be directed to the program instructor.
©2005
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Slide 1 of 80
• About the Instructor
• About the Sponsor
• Seminar Discussion Forum
Walkable Roof Deck Membranes
Walkable Roof Deck Membranes
Presented By:
John Ogilvie
Duradek Ltd.
1722 Iron St., North Kansas City, MO, USA 64116
8288- 129th Street , Surrey, B.C., Canada V3W 0A6
Description:
Provides an overview of walkable roof deck membranes and
roofing systems, including a discussion of the key principles
of deck design, design considerations, and how to install and
specify roof deck membrane systems.
AIA/CES Info:
Provider No. J624 – Course No. AEC046; LUs – 1.5
MCE Info:
Contact your respective governmental licensing and
regulatory agency. This program qualifies for HSW credit.
Expiration date:
June 30, 2006
This program is registered with 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 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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Slide 2 of 80
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Walkable Roof Deck Membranes
How to use this Online Learning Course
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To view this course, use the Previous and Next buttons at the bottom of each
slide or the up and down arrow keys on your keyboard.
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To exit the course at any time, press the ESC key on your keyboard. This will
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Some slides may contain additional instructor comments. To view them, doubleclick on the
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•
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 remember or 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 course.
•
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 80
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Walkable Roof Deck Membranes
Learning Objectives
Upon completing this course, you will have a better understanding of:
•
Types of walkable roof decks, various waterproofing options, and their common
problems.
•
The characteristics, advantages, and applications of walkable roof deck and
outdoor flooring systems.
•
Important design concepts and considerations for walkable roof decks, balconies
and walkways.
•
Walkable roof deck and outdoor flooring system installation considerations,
common details and key issues related to specifying waterproof PVC-based roof
deck and flooring membranes.
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Slide 4 of 80
• About the Instructor
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• Seminar Discussion Forum
Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
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Slide 5 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Introduction
•
Pedestrian decks are surfaces that are
subjected to pedestrian traffic.
•
Pedestrian decks can be constructed
with a wood or concrete substrate
and can be waterproofed using a
variety of different materials.
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Slide 6 of 80
• About the Instructor
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Waterproofing Systems
•
Waterproofing systems for wood or
concrete decks are typically classified
as protected membrane assemblies or
exposed membrane assemblies.
•
In protected assemblies, the waterproof membrane is protected by
another surface, such as concrete
pavers, tiles, or outdoor carpet.
•
In exposed assemblies, the waterproof membrane, either a liquidapplied coating or a PVC membrane,
is exposed to the elements.
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Slide 7 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Applications
Roof Decks
Balconies
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Slide 8 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Applications, cont'd…
Patios
Sun Decks
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Slide 9 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Applications, cont'd…
Ramps
Walkways
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Slide 10 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Common Problems
Traditional methods of waterproofing
decks result in several common problems:
•
Leaks and Puddles
•
Rotting Wood
•
Delaminating Coatings
•
Deteriorating Concrete
•
Unsightly Appearance
Over time, these problems necessitate
costly maintenance and expensive repairs.
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Slide 11 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Problems With Liquid Coatings
•
Concrete substrates tend to shift
in response to daily temperature
fluctuations, leading to unsightly
and potentially dangerous cracks.
•
This constant movement puts
enormous stress on epoxy, urethane
and acrylic liquid-applied coatings.
•
Pinholes, blisters, or surface cracks
often result, allowing moisture to
penetrate the membrane and cause
further deterioration of the concrete.
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Slide 12 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Problems With PVC Membrane
•
Membrane is exposed to
environmental and mechanical
damage.
•
Aesthetics and waterproofness of
roof decks are dependent on skilled
installers.
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Slide 13 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Problems With Outdoor Carpet Overlay
•
Installed on it's own, outdoor carpet
is not waterproof. In fact, outdoor
carpet tends to hold water and dry
very slowly.
•
Without a waterproof membrane,
it will allow water to penetrate the
concrete or wood substrate below,
causing it to rot and deteriorate.
•
In addition, outdoor carpet fibers
tend to deteriorate rapidly when
exposed to the sun and often require
frequent replacement as a result.
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Slide 14 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Problems With Wood Overlay
•
Although wood decks can provide
a unique aesthetic appeal, even
treated wood will deteriorate when
exposed to the elements.
•
Over time, exposure to moisture will
cause wood decking to split, warp,
twist, shrink, splinter, crack, and rot.
•
In addition, wood decks are highly
combustible and can be slippery
when wet. They require constant
maintenance, as well as regular repainting or re-staining.
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Slide 15 of 80
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Walkable Roof Deck Membranes
Pedestrian Roof Deck Basics
Problems With Paver Overlay
•
It is difficult to maintain, repair or
replace waterproofing membrane
under the pavers.
•
Drainage is critical to waterproof
membrane performance.
•
Structure has to be designed to
accept additional system weight and
clearance requirements.
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Slide 16 of 80
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Walkable Roof Deck Membranes
Pedestrian Deck Basics
Problems With Concrete Buildings
•
Sound pedestrian roof deck
waterproofing principles apply
equally to hi-rise buildings with
concrete or steel structure as it does
to wood-frame construction.
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Slide 17 of 80
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Walkable Roof Deck Membranes
Walkable Membrane
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Slide 18 of 80
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Walkable Roof Deck Membranes
Walkable Membrane
Introduction
•
Waterproof outdoor roof deck and
flooring systems consist of premanufactured PVC sheet membranes
that are applied to wood or concrete
deck surfaces.
•
In contrast to other waterproofing
systems, PVC membranes are able to
move with the subsurface, without
cracking, bulging, or blistering.
•
Simply put, waterproof PVC flooring
systems successfully bridge the cracks
that often cause other waterproofing
products to fail.
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Slide 19 of 80
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Walkable Roof Deck Membranes
Walkable Membrane
Characteristics
•
Back-Gluing Surface / Front-Wear Surface
Waterproof PVC membranes are premanufactured and can be fabricreinforced to provide added stability
and multi-directional strength.
•
PVC membranes are available in
different widths (54" to 72") and
thicknesses (32 mils to 60 mils).
•
48 mil (1.2mm) membranes minimum
thickness are required for roof
applications or higher-traffic areas.
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©2005
PVC
Woven
Polyester
Non-Woven
Polyester
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Slide 20 of 80
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Walkable Roof Deck Membranes
Walkable Membrane
Patterns, Colors, and Textures
PVC membranes are available in wide variety of patterns, colors, and textures.
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Slide 21 of 80
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Walkable Roof Deck Membranes
Walkable Membrane
What to Look For in a Membrane
There are several characteristics to look
for when selecting a PVC membrane:
•
Fabric-Reinforcement
•
Slip-Resistant Texture
•
Mildew Inhibitors
•
UV and Heat Stabilizers
•
Fire Retardant
•
Chemical Resistant
•
Building Code Approvals
These characteristics ensure high quality,
durability, and long-term performance.
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Slide 22 of 80
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Walkable Roof Deck Membranes
Walkable Membrane
Advantages
•
Durability: Even when exposed to heavy traffic and severe weather conditions,
PVC membranes will outlast "painted" surfaces by years. PVC membranes will
not peel, chip, delaminate or crack, even on high-use walkways.
•
Safety: In contrast to wood or concrete surfaces, which can become slippery
when wet, PVC membranes are available in a range of textured surfaces that
offer varying degrees of slip-resistance as required.
•
Installation: PVC membranes can be installed quickly and easily in any weather
conditions, even over existing coatings. Because PVC membranes are ready for
immediate use, they result in fewer tenant disruptions and lengthy closures.
•
Maintenance: Whereas coated systems often require regular recoating and
maintenance, PVC membranes require only regular cleaning to remove any dirt
or chemicals from the deck surface.
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Slide 23 of 80
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Walkable Roof Deck Membranes
Design Considerations
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Slide 24 of 80
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Walkable Roof Deck Membranes
Design Considerations
Introduction
When waterproofing a walkable roof
deck, there are a number of important
principles to consider:
•
•
•
•
•
•
Deflection
Drainage
Drying
Durability
Detailing
Deconstruction
Each plays a key role in the performance
of the deck and waterproofing system.
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Slide 25 of 80
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Walkable Roof Deck Membranes
Design Considerations
Deflection
•
Deflection refers to a deck's ability to
control surface water and is affected
by a number of factors, including
slope, drip edges, and diverters.
•
In multi-story buildings where decks
or balconies are stacked, the structure
below will benefit from the overhang
provided by the balcony above.
•
If a deck is designed correctly, water
will flow away from the building into
a gutter system or over a drip edge
away from the exterior wall system.
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Slide 26 of 80
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Walkable Roof Deck Membranes
Design Considerations
Slope
•
A proper deck slope of 1/4" in 12
will help reduce the possibility of
ponding water, even with building
shrinkage or settlement.
•
False fascia detail can be used to hide
gutter, fascia, railing mounts and
deck slope.
•
Given the proper slope, a simple
drip edge detail is typically the most
expedient way of removing surface
water from the deck surface.
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Slide 27 of 80
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Walkable Roof Deck Membranes
Design Considerations
Diverters
•
Once the deck has been designed
with the proper slope, it is critical
that water be deflected away from
deck transitions at adjoining walls.
•
Even a rain-screen wall system would
have difficulty handling the volume
of water flowing from a deck surface
that is not diverted properly.
•
Simple pre-manufactured diverters
can be installed on the deck surface
and waterproofed to easily deflect
water away from any critical areas.
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Slide 28 of 80
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Walkable Roof Deck Membranes
Design Considerations
Diverters, cont'd…
These images show two simple, but effective cricket and flap water diverters.
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Slide 29 of 80
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Walkable Roof Deck Membranes
Design Considerations
Diverters, cont'd…
Severe structural damage can occur when water is not properly diverted.
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Slide 30 of 80
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Walkable Roof Deck Membranes
Design Considerations
Drainage
•
Drainage refers to the ability of the
building assembly to redirect any
liquid water that enters the system
and allow it to drain to the outside.
•
Drainage depends on the proper
sequencing of moisture barriers and
detailing of wall openings and posts.
•
Proper wrapping of rough door
opening jambs and sloping of door
sill framing members will help deflect
any trapped moisture to the outside.
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Slide 31 of 80
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Walkable Roof Deck Membranes
Design Considerations
Flashing
•
Flashing is a critical component of
the deck waterproofing system and
must be correctly integrated with
the PVC waterproofing membrane.
•
Flashing may be used to tie a new
PVC membrane into the existing wall
membrane and wall cladding.
•
Alternately, the PVC membrane can
be brought up the existing wall and
covered with metal reglet flashing or
through-wall flashing as required.
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Slide 32 of 80
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Walkable Roof Deck Membranes
Design Considerations
Flashing, cont'd…
•
Curbs or knee walls greater than 3"
in height or higher than any wall
opening result in a "trapped" deck
system that requires special drainage.
•
With trapped decks, it is important
to ensure that the top plate of the
curb or knee wall slopes back toward
the deck surface (at about 1 in 6).
•
In addition, the membrane should
extend to the line of the outside drip
edge, which should extend well out
from the building wall surface.
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Slide 33 of 80
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Walkable Roof Deck Membranes
Design Considerations
Flashing Cont'd…
Incorrect detailing of flashing elements will lead to leaks and water damage.
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Slide 34 of 80
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Walkable Roof Deck Membranes
Design Considerations
Sequencing
•
Proper sequencing of moisture
barriers is critical. A peel and stick
capping membrane should overlap
two layers of building paper, which
in turn overlay the PVC membrane.
•
Installing the PVC membrane after the
wall assembly has been completed will
almost always lead to failure.
•
It is also recommended that the PVC
waterproofing membrane extend a
minimum of 6" up the vertical surface,
behind the building paper.
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Slide 35 of 80
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Walkable Roof Deck Membranes
Design Considerations
Sequencing, cont'd…
•
Posts are another deck element
where proper construction and
sequencing of moisture barriers
is essential.
•
To waterproof posts, they must be
covered with a moisture barrier and
then finished with siding.
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Slide 36 of 80
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Walkable Roof Deck Membranes
Design Considerations
Sequencing, cont’d…
•
For applications where the
dramatic effect of a rough hewn
wood post is required, special
consideration must be made for
post attachment.
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Slide 37 of 80
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Walkable Roof Deck Membranes
Design Considerations
Sequencing, cont’d….
•
Curbs, knee walls, posts, and wall
openings must be constructed and
detailed properly to ensure the
performance of the membrane.
•
Whether modifying an existing door
opening or constructing a new door
opening, the sill should be sloped
toward the deck surface.
•
In addition, the waterproof
membrane should continue into and
waterproof the rough door opening
saddle in order to deflect any
moisture intrusion.
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Slide 38 of 80
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Walkable Roof Deck Membranes
Design Considerations
Sequencing, cont'd…
•
Improper sequencing of building
components can lead to severe
moisture intrusion.
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Slide 39 of 80
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Walkable Roof Deck Membranes
Design Considerations
Drainage
•
Building authorities may require
overflow drains or scupper boxes on
trapped decks to provide a path for
water to drain from the deck.
•
ABS-shower drains are typically not
suitable for any roof deck or multifamily building applications.
•
Only PVC-coated drains or drains
with a positive clamping system are
suitable to allow water to drain into
the building's storm water system.
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Slide 40 of 80
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Walkable Roof Deck Membranes
Design Considerations
Drainage, cont'd…
•
With PVC-coated overflow devices,
the PVC decking membrane can be
welded directly to the PVC-coated
surface, with no caulking required.
•
Drains and scuppers should be sloped
toward the outside and scuppers
should be let into the deck surface
so as not to allow ponding to occur.
•
In general, scuppers are very difficult
to detail in such as way as to make
them truly impervious to wind, rain,
snow, and structural deflection.
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Slide 41 of 80
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Walkable Roof Deck Membranes
Design Considerations
Drainage, cont'd…
These images illustrate poor drainage on a trapped deck.
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Slide 42 of 80
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Walkable Roof Deck Membranes
Design Considerations
Drying
•
Drying refers to any features of the
building assembly that speed the
drying of materials that have been
exposed to moisture.
•
Drying can be aided by the use of
a rain screen wall assembly or by
the venting of trapped air spaces.
•
Venting of the air space underneath
decks, balconies, and walkways with
a closed soffit or ceiling is especially
important for adequate drying.
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Slide 43 of 80
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Walkable Roof Deck Membranes
Design Considerations
Ventilation
•
If the underside of a roof deck,
balcony, or walkway has a closed
soffit or ceiling, venting is required in
order to reduce moisture buildup.
•
To be effective, the vent area should
be greater than or equal to 1/150 of
the insulated ceiling area.
•
It is important to provide equal
venting at both ends of the joist runs
or to install purlins above the joists in
order to allow for cross ventilation.
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Slide 44 of 80
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Walkable Roof Deck Membranes
Design Considerations
Ventilation, cont'd…
•
Some manufacturers offer deck
ventilation systems that allow for
venting of the roof space joist runs
in new and retrofit construction.
•
These deck ventilation systems work
by allowing air from the roof space
to circulate up and through a
perforated mesh flashing detail.
•
These systems can be installed
without altering the elevation of
the deck, door openings, railings,
or through-wall flashing details.
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Slide 45 of 80
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Walkable Roof Deck Membranes
Design Considerations
Ventilation, cont'd…
Insufficient ventilation of the deck space can lead to mold, mildew, and rot.
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Slide 46 of 80
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Walkable Roof Deck Membranes
Design Considerations
Durability
•
Durability refers to assemblies and
materials that are tolerant of foot
traffic, moisture, mildew, chemicals,
and environmental conditions.
•
The durability of the assembly will
be affected by the selected
waterproofing membrane.
•
Durability will also be affected by the
overall maintenance of the
membrane.
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Slide 47 of 80
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Walkable Roof Deck Membranes
Design Considerations
Durability, cont’d…
•
The quality of the ingredients can
vary the price of a similar looking
membrane by 25% …. and the life
expectancy by 75%.
•
Photos show accelerated testing
samples of two different materials
with 700 MJ/m² UV = 2.4 years of
Florida sun exposure.
•
Testing samples shown have test
strips on left side (exposed) and
control strips on right side
(unexposed).
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Slide 48 of 80
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Walkable Roof Deck Membranes
Design Considerations
Durability, cont’d…
Model Building codes dictate the
requirements for roof and walking deck
membranes.
Roof Covering Classification
When deemed required, roof
membranes are tested in accordance
with nationally recognized standards,
i.e. ASTM E-108 (International Codes),
ULC-S107 (NBC), for Class “A”, “B” or
“C” Fire Endurance Rating.
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Slide 49 of 80
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Walkable Roof Deck Membranes
Design Considerations
Durability, cont’d…
Material Standards
PVC Roof and Walking Deck Membranes
must conform to the same material
standards as PVC Roofing and
Waterproofing Membranes. CAN/CGSB–
37.54 is a recognized standard by both
the International Codes and NBC. This
standard acts as a basis for evaluating
PVC membranes used on decking that is
subject to pedestrian traffic.
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Slide 50 of 80
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Walkable Roof Deck Membranes
Design Considerations
Durability, cont’d…
Suitability
Alternative material, material, or type or method of construction can be accepted as
long as they demonstrate compliance with the performance features of the
applicable code. In the United States, ICC Evaluation Service evaluates Roof and
Walking Deck Membranes in accordance with the ICC-ES interim Criteria for Walking
decks (AC39), dated March 2000. In Canada, PVC Sheet-Applied Waterproof Decking
Membranes must comply with CMHC’s CCMC technical guide Masterformat number
07543, dated 2000-10-10.
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Slide 51 of 80
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Walkable Roof Deck Membranes
Design Considerations
Durability, cont’d…
Quality Control
Products shall be manufactured under an approved
quality control program with inspections by an
inspection agency accredited by the International
Accreditation Service (IAS).
Please remember the word MEMBRANE. You will be required
to enter it in order to proceed with the online examination.
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Slide 52 of 80
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Walkable Roof Deck Membranes
Design Considerations
Compatibility
•
It is important to ensure that
all components of the
waterproofing system are
compatible and will not
adversely affect performance.
•
This includes the membrane,
along with any tapes, sealants,
adhesives, drains, scupper
boxes, flashings, or perimeter
fastening devices.
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Slide 53 of 80
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• Seminar Discussion Forum
Walkable Roof Deck Membranes
Design Considerations
Maintenance
•
Waterproof PVC roof deck and
flooring systems are highly durable
and easy to maintain with periodic
washing to remove surface dirt.
•
Rougher membranes may require
washing with a scrub brush and mild
detergent or pressure washing.
•
Regular inspection of caulking and
immediate attention to any lose
seaming will ensure that the PVC
membrane lasts for years to come.
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Slide 54 of 80
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Walkable Roof Deck Membranes
Design Considerations
Detailing
•
Detailing refers to the workmanship
involved in installing materials and
assemblies such that they are watertight and aesthetically appealing.
•
A good or bad detail can often mean
the difference between a good and a
bad installation.
•
The use of pre-manufactured flashing
details for outside corners, posts, and
railing attachments can help ensure a
neat and waterproof detail.
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Walkable Roof Deck Membranes
Design Considerations
Detailing, cont’d…
•
Good workmanship and proper
detailing are critical to the longterm performance of a waterproof
outdoor flooring system.
•
Waterproofing systems should
always be installed by manufacturerapproved and/or trained technicians.
•
PVC membranes can be hot-air
welded to provide a completely
water-proof seam, making them
well suited to fine detailing.
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Walkable Roof Deck Membranes
Design Considerations
Detailing, cont'd…
Poor workmanship and improper detailing results in poor deck performance.
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Walkable Roof Deck Membranes
Design Considerations
Detailing, cont'd…
Manufacturers typically offer a wide range of pre-manufactured flashing details.
Post Collar
Flashing Detail
Raised Railing Post
Flashing Detail
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Outside Corner
Flashing Detail
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Walkable Roof Deck Membranes
Design Considerations
Detailing, cont’d…
Various details can be used to reduce the possibility of water intrusion
at railing post connections.
Raised Railing Post Detail
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Raised Curb Detail
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Walkable Roof Deck Membranes
Design Considerations
Detailing, cont’d…
Fascia Mounted Railing
Fascia Mounted Railing with Trim Board
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Walkable Roof Deck Membranes
Design Considerations
Deconstruction
•
Deconstruction refers to the use of
waterproofing solutions that offer
long-term life expectancy as well as
ease of replacement.
•
Deconstruction is a relatively new
concern that has become increasingly
important for "green" construction.
•
Demountable flashing systems are
one way to reduce the amount of
deconstruction required to repair or
replace a waterproofing membrane.
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Walkable Roof Deck Membranes
Design Considerations
Deconstruction, cont'd…
•
In terms of durability, today's
waterproof PVC membranes can be
expected to last for 10 to 15 years
with proper care and cleaning.
•
As for ease of replacement, one way
to significantly reduce the amount
of deconstruction required is to use
demountable flashing systems.
•
These systems are easy to remove
and allow the PVC membrane to be
repaired or replaced quickly and
easily with minimum destruction.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Examination
•
Verify that deck is secure, well supported, clean, smooth, free of depressions,
waves and projections, properly sloped to drains, valleys, or eaves.
•
Verify that surfaces and site conditions are ready to receive work and conform to
membrane manufacturer’s requirements and local building code standards.
•
Notify the consultant of any conditions that would prevent satisfactory
completion of work. Do not proceed until unsatisfactory conditions are
corrected.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Surface Preparation
•
Wood Decks: Fill joints, knot holes,
voids and low areas with filler and
sand smooth.
•
Wood Decks: For Class “A” approved
application, cover plywood with
cementitous board meeting
requirement.
•
Concrete Decks: Fill surface
imperfections and variations with
leveling compound. Test for and
remove surface contamination
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Surface Preparation, cont'd...
•
When installing a waterproof PVC membrane over an existing system that has
failed, the deck must be thoroughly inspected for rot, weakness of plywood,
delamination of plywood, loose panels, or spalling concrete that may be hidden
under the existing waterproofing membrane.
•
Installers should inspect all surfaces to receive PVC membranes to ensure that
conditions are satisfactory and that deck construction meets local building code
standards as required.
•
To ensure adequate adhesion, installers should glue a small test patch of the PVC
membrane (about 2 ft2) to the existing surface. If there are any concerns about
the ability of the membrane to bond to the existing surface, the coating must be
removed and the deck resurfaced with a suitable underlay.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Installation
•
Install in accordance with
manufacturer’s instructions,
applicable codes, and CGSB-37-GP55M.
•
Adhere membrane to substrate.
•
Install membrane with minimum
number of seams possible. Overlap
seams ¾” (19mm) to shed water.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Seaming
•
Seaming, the process of fusing two
sheets of PVC membrane together, is
the most critical element of a PVC
waterproofing system.
•
Adjacent membranes should overlap
by a minimum of 3/4" to allow for a
strong hot-air welded seam.
•
It is important to remember that
proper fusing cannot take place if
the back of the overlapping piece
of PVC has been glued.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Seaming, cont'd…
•
Seam strength and integrity should
be checked every few feet. If the
seam comes apart, the welding is
incomplete and must be redone.
•
Extreme care must be used when
welding a PVC membrane where the
seam runs into a 90° corner and
vertically up a wall or over an edge.
•
All wall and corner seaming must be
carefully inspected for pinholes. A
strip of PVC may be welded to the
seam for added security.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Protection
•
On projects where the deck is to be
used as a staging area for other
trades, protective panels are to be
applied over finished membrane.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Common Details: Metal and PVC
1.
The inside back corner and outside
front corner of the PVC membrane
are folded and welded, not cut.
2.
Galvanized flashing with a PVC clip
holds the PVC membrane in place.
3.
A roof-quality drain with clamping
ring holds the PVC membrane in
place and provides drainage.
4.
Colored metal flashing installed over
the PVC membrane completes the
waterproofing of the deck curb.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Common Details: PVC-Coated Metal
1.
The PVC membrane is heat-welded
to a PVC-coated flashing which
provides a drip edge at the outside
perimeter of the deck surface.
2.
The PVC membrane is heat-welded
to a PVC-coated scupper box, which
provides drainage.
3.
The PVC membrane is heat-welded
to a PVC-coated overflow drain,
which also provides drainage for
trapped or curbed decks.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Common Details: "L" Trim
1. A metal "L" trim is used to secure
the PVC membrane to both the
outside and inside edges of the deck,
balcony, or walkway surface.
2. To meet building codes, the PVC
membrane should be extended up
the wall by a minimum of 6".
3. In order to ensure a waterproof
installation, the PVC membrane is
overlapped by the building paper
and exterior finish.
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Walkable Roof Deck Membranes
Roof Deck Membrane Installation
Common Details: Fully Wrapped
1. The PVC membrane is fully-wrapped
over the fascia at the exterior edge
of the deck surface.
2. The PVC membrane is secured to the
inside edge with an inverted "L" trim
and sealant (gumstop).
3. Butyl tape is applied at the inside
edge to provide a secondary sealant.
4. A metal "L" trim can also be used
to secure the PVC membrane to the
bottom of the fascia.
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Walkable Roof Deck Membranes
Specifying Roof Deck Systems
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Walkable Roof Deck Membranes
Specifying Roof Deck Systems
Part 1: General
•
Installation and seaming plans, showing joints, termination details, and material
interfaces should be submitted, along with two labeled samples (8-1/2" x 11") of
the specified PVC membrane showing finish, pattern, color, and backing.
•
Manufacturer to have 25 years experience with products in use. Installers to be
trained and approved by manufacturer.
•
A pre-installation meeting involving the client's representative, manufacturer's
representative, contractor, and installer should be held at least one week prior
to the start of installation to discuss pedestrian deck waterproofing practices, as
well as any precautions applicable to the specific project.
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Walkable Roof Deck Membranes
Specifying Roof Deck Systems
Part 2: Products
•
PVC membranes should be stored in a sheltered place with no direct contact
with the ground.
•
It is important to specify a polyester-reinforced PVC membrane with ultra-violet
resistance for fully-adhered installation with heat-welded seams and perimeter
attachment. Always specify overall sheet thickness, as well as width and color.
•
All perimeter fasteners and PVC-coated metal scuppers, overflow drains, roof
drains, and trim should be provided by the membrane manufacturer. Whenever
possible, the color of the perimeter fasteners should be coordinated with the
membrane. Flashings are typically manufactured and installed by other parties.
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Walkable Roof Deck Membranes
Specifying Roof Deck Systems
Part 2: Products, cont’d…
•
Model building codes are designed to ensure that buildings are structurally
sound, safe from fire, free from health hazards and accessible.
•
Walkable roof deck membrane requirements include:
• Provide class A, B or C fire protection classification. (1)
• Conform to CAN/CGSB – 37.54 polyvinyl chloride roofing and waterproofing
membrane.
• Suitability of product as a walkable roof membrane. (2)
• Product listed by accredited quality control provider.
(1) Conform to ASTM E-108 (United States)
(2) ICC evaluation services (United States)
Conform to ULC-S107 (Canada)
COMC (Canada)
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Walkable Roof Deck Membranes
Specifying Roof Deck Systems
Part 3: Execution
•
Prior to installation, an examination should be conducted to verify that the
existing deck is secure and solid in accordance with local code structural
requirements, and that the surface is clean and smooth, free of depressions,
waves and projections, and properly sloped to drains, valleys, and eaves.
•
Any joints, voids, or low areas of a wood deck should be filled and sanded
smooth. Any surface imperfections or variations on a concrete deck should be
filled with leveling compound and the surface cleaned of any contaminants.
•
Waterproof PVC membranes should not be installed when temperatures are
below 25°F or above 98°F, or when winds are gusting over 30 mph. The PVC
membrane should be installed with the minimum number of seams possible.
All seams should overlap 3/4" and be heat-welded.
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Walkable Roof Deck Membranes
Conclusion of This Program
•
AEC Daily Corporation is a Registered provider with the
AIA Continuing Education System. 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.
©2005 Duradek Ltd. The material
contained in this course was researched,
assembled, and produced by Duradek
Ltd. and remains their property.
Questions or concerns about this course
should be directed to the instructor.
In Memory of
Michael J. Moran
1964 - 2005
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