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CRCA Education Series

Self-Adhering Membrane Roofing Systems for Low Slope Roofs

CRCA is a Registered Provider with the American Institute of Architects Continuing Education Systems. Credit earned upon completion of this program will be reported to CES records for all AIA members. Certificates of Completion for non-AIA members are available upon requests. This program is registered with AIA/CES for continuing professional education. As such, it does not included 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 product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

Learning Objectives

· After completing this course, you will be able to:

­ State the definition of a low slope roof ­ Describe some of the historical and technical developments in self-adhering roofing systems ­ Describe the components of a self-adhering roofing assembly ­ Describe one or more key technical developments of self-adhered roofing systems ­ Describe the principle factors that need to be considered in the design of a self-adhering roofing system ­ Describe the key considerations needed for the successful installation of a self-adhering roofing system

Low Slope Roofing Overview

· Low Slope Roofs

­ These roofs have a slope of 3" per foot or less, according to the National Roofing Contractors Association (NRCA) ­ The minimum slope for a roof, as mandated by building codes, is 1/4" per foot ­ Depending upon a structure's individual design, more slope may be required to assure adequate drainage and prevent "ponding water"

Low Slope Roofing Overview

Roofing Demand by Building Type

Other 6%

$

Institutional 19%

Office & Commercial 53% Industrial 22%

Source: The Freedonia Group, Inc. 2006

Low Slope Roofing Overview

Roofing Demand by Application

$

New Construction 20.7% $1.4 Billion

Reroofing 79.3% $5.4 Billion

Source: The Freedonia Group, Inc. 2006

Low Slope Roofing Overview

Annual Number of Modified Bitumen Squares Shipped

Numbers in (000's)

SBS 2001 2002 2003 2004 2005 2006 6,455 6,762 7,445 8,044 8,335 8,133

APP 6,857 6,371 7,022 7,157 7,614 6,656

SelfAdhering 394 690 758 718 941 1,007

Self-Adhering Underlayment 6,982 8,789 12,084 15,059 16,835 17,274

Note: Data from Asphalt Roofing Manufacturers Association - Summary of Asphalt Roofing Industry Shipments for All Reporting Companies; No information on Self-Adhering shipments prior to 2000.

Low Slope Roofing Overview

· Low Slope Roofing Advancements

­ The past 20 to 30 years have seen significant technological developments ­ These developments are the result of the industry's ongoing research ­ Many roof system choices are available for low slope bituminous roof applications ­ Self-adhering modified bitumen systems (or SAMBs) are one of the most recent roof system developments

Self-Adhering Roofing Systems Overview

· Beginnings of Self-Adhering Roofing

­ Waterproofing ­ 1960's ­ Roofing - Europe - mid 1970's ­ More recent introduction of higher quality (better tackiness) in Europe in the early 1990s

Carlisle

Grace

Polyguard

Firestone

Technical Developments in SelfAdhering Roofing Systems

· Trends in the MB Self-Adhering Roofing Systems Industry

­ Beginnings of self-adhering application ­ Early usage ­ Eave edge, valley underlayment ­ Exposed residential add-ons and low-slope applications ­ ­ Porches, "Florida" rooms, carports, breezeways, etc.

Self-Adhering Roofing Systems Overview

· Entry Into U.S. Market

­ Late 1970's ­ Early 1980's ­ ­Self Adhered SBS / Polyethylene & Foil Sheets ­ 40-50mil ­ Early 1990's ­ ­SBS / fiberglass, polyester reinforced, granular surfaced sheets ­ Future....

Self-Adhering Roofing Systems Overview

· Self Adhered Modified Bitumen Roofing Membrane

­ 1960's-70s technological advances in asphalt sciences originating in Europe led to the development of modifiers · APP (atactic polypropylene) · SBS (styrene-butadiene-styrene) ­ When added to unblown (unoxidized) asphalt, these impart either plastic (APP) or rubber (SBS) characteristics ­ These additives provide enhanced performance characteristics to traditional asphalt ­ 2007 - Combination Hybrids - Proprietary Blends ­ New Adhesives

Self-Adhering Roofing Systems Overview

· Self Adhered TPO · Hot melt pressure-sensitive adhesive

­ 100% solids

­ Double-sided release liner ­ Rolled, not broomed

· Thicknesses

­ 45 & 60-mil

· Sheet sizes

­ 5 and 10-foot widths ­ 50 and 100-foot lengths

Carlisle

Self-Adhering Roofing Systems Overview

· Self Adhered TPO

· Seaming

­ Heat-welded

Self-Adhering Roofing Systems Overview

· Self Adhered TPO

· Temperatures

­ Install @ 50F+

· Substrates

­ Insulations, Plywood, OSB, Gypsum

· Detailing

­ Same details and accessories standard TPO ­ End laps - welded reinforced TPO overlays ­ Angle changes - membrane secured with fasteners and plates

Self-Adhering Roofing Systems Overview

· Developments in U.S. Usage

­ Self-adhering systems primary uses - application method restrictions:

· Risk of fire · Environmental concerns · Smell · Lack of equipment access

­ Specifically....

· Roofing and re-roofing - historical structures · Other combustible (wood) deck structures · Healthcare and educational facilities

Technical Developments in SelfAdhering Roofing Systems

· Self-Adhering Roofing Systems Characteristics

­ Environmentally Friendly ­ ­ ­ ­ ­

· No asphalt fumes or unpleasant odor during application

Ease of Application Less Mess Speed Good for Poor Access Jobs Color Complement Ability

· With steep slope roof

· Systems Can Be Used Over Many Types of Decks

­ Nailable (wood, etc.) ­ Non-nailable (concrete, steel decks, etc.) ­ Over Insulation

Technical Developments in SelfAdhering Roofing Systems

· Self-Adhering Roofing Systems Characteristics

­ No Torch or Hot Asphalt Needed

· Improved Safety · Reduced Insurance Exposure

­ Cleanliness ­ Minimal Tools and Equipment Needed ­ Durability

EPDM Roofing Association

Self-Adhering Roofing Systems Overview

· Low Slope Self-Adhering Roofing Systems Requirements

­ ­ ­ ­ ­ ­ Waterproof Meet structural load requirements Resistant to fire and wind uplift Provide UV deflection Compatible with insulation where applicable Provide a suitable surface for necessary routine foot traffic to access rooftop equipment

· All components of the low slope self-adhering roof assembly must be compatible with one another · Necessity for future repair and recovering possibilities in the design of a roof should be taken into consideration

· Temperature Limitations ­ 50F+ · Clean, dry, no dust...

Self-Adhering Roofing Systems Overview

· Components of Low Slope Self-Adhering Roof Systems

­ The three basic components of a low slope self-adhering assembly are: · Roof deck · Insulation · Roof membrane

Use of Layered Self-Adhering Roofing Systems

· 1, 2-Ply and 3-Ply Systems Based on Roof Needs

TPO ­ 1-Ply System MB's - 2-Ply System

· Comprised of a base sheet and cap sheet · For use on small, residential projects

Base Cap Mid Ply

­ MB's - 3-Ply System

· Comprised of base sheet, mid-ply membrane and cap sheet · For use on large, commercial projects

· Surface Film Adherence

­ A surface film on top of the base sheet or mid-ply membrane designed to improve adherence and durability

Self-Adhering Roofing Systems Overview

· Installation Guidelines- Low Slope Self-Adhering Roof Systems

­ Roof membrane layout always begin at the low point of the roof ­ MB's - Self Adhered Seams ­ TPO's - Heat Welded Seams ­ All membrane plies are installed with overlapping side and endlaps. Sidelaps of the various plies are offset ­ MB's - T-Laps Sealed, ­ TPO's ­ T-Laps, End Laps Covered. ­ While every aspect of the low slope self-adhering roof specification and the quality of the installation is important, flashing and termination details are critical

Technical Developments in SelfAdhering Roofing Systems

· Self-Adhering MB Roofing Systems Characteristics

­ Newest Technology ­ Latest in asphalt technology ­ Offers substantial waterproofing ­ Carriers: fiberglass, polyester mats - stable ­ Dedicated primers and mastics to complete installation ­ Weathering grade compound top side - adhesive asphalt bottom layer

· Different from 1980's versions

Three-Layer Self-Adhering Roofing Systems

· Overview of Self-Adhering Systems Installation

­ Application recommended above 45-50°F (10°C) ­ Low-side, shingle fashion ­ Cleanliness

· Dispose of tear-off film · Dust

­ End lap preparation

· Adhesive · Hot air gun, Welding, Patching

­ Roller (heavyweight) to press into place ­ T-Lap Sealing ­ End Lap Treatment

Three-Layer Self-Adhering Roofing Systems

· MB Installation Details

­ Rain Gutter ­ 2-Ply Installation

Three-Layer Self-Adhering Roofing Systems

· Installation Details

­ 3-Ply Installation

Three-Layer Self-Adhering Roofing Systems

· MB Installation Details (Cont)

­ Flashing Specifications

· Two main types: ­ Membrane (base flashing) ­ Metal (counter-flashing and cap flashing)

Polyglass

Three-Layer Self-Adhering Roofing Systems

· MB Installation Details (Cont)

­ Perimeter Detail

Three-Layer Self-Adhering Roofing Systems

· MB Installation Details

­ Shingle Transition

Self-Adhering Roofing Systems Code Information

· ASTM Standards

­ None yet for specific SBS/APP/TPO Self Adhered Low Slope sheets... ­ Work in progress to develop standards to address APP and SBS based selfadhesive membranes used in both steep-slope and low-slope applications ­ ASTM D1970, "Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection...for now

· International Code Council (ICC) Approvals

­ ICC-Evaluation Services ­ Reviewing... ­ Wind Uplift & Fire Ratings ­ Available ­ Check Classification Listings

Course Summary

· We have reviewed the following topics:

­ The definition of a low slope roof ­ Some of the historical and technical developments in self-adhering roofing systems ­ The components of a self-adhering roofing assembly ­ Key technical developments of self-adhering TPO and modified bitumen roofing systems ­ The principle factors that need to be considered in the design of a selfadhering roofing system ­ The key considerations needed for the successful installation of a selfadhering roofing system

Thank You for Your Participation

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CRCA Education Series

Self-Adhering Membrane Roofing Systems for Low Slope Roofs

Information

Microsoft PowerPoint - 2008 Tr Show Self Adhered Roofing Membranes Quimby

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