Transcript Advantages of Cold Applied Roofing
Advantages of Cold Applied Roofing Systems
Name Position Title
DERBIGUM.
AIA/CES
DERBIGUM is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of the program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.
AIA/CES
This program is registered with the AIA/CES for continuing 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.
Learning Objectives
Upon completion of this program, participants will be able to:
Define Cold Applied Roofing Identify the key composition of Polymer Modified Cold Adhesives Recognize the types of Cold Applied Roof Systems and their advantages.
Understand the application methods Acknowledge the precautions when using Cold Applied Systems
What is Cold Applied Roofing?
Polymer-Modified Bitumen Membranes vs.
Cold Built Up Systems
Alternative to:
•Torch-applied systems with open flame •Hot asphalt applied systems with use of a hot kettle
Traditional Hot Applied System / Oxidized Asphalt Oxidized Asphalt Introduction of oxygen to flux Benefits Increases softening point Increases utility of asphalt Problems Decreases thermal fatigue cycle Increases brittleness and breakdowns
Cold Applied Roofing
•Employs polymer modified adhesive in conjunction with polymer-modified bitumen membranes •Can be used with either APP or SBS systems
Composition of Polymer-Modified Adhesives Asphalt Mineral Spirits Polymers Cellulose Fibers Fillers
Asphalt Cellulose Fibers Fillers
Base Asphalt Petroleum Asphalt is the base of Cold Applied Adhesives Characteristics Black Sticky Highly Viscous
Solvents vs. Mineral Spirits Solvents Hot solvents create quicker set Toluene Xylene Mineral Spirits Mineral spirits slower set Less damage to roofing membrane Higher Flashpoint = Safer Application
Polymers Types SBS APP IPP Benefits Encapsulates the light oils Increases the pliability of the bitumen
Cellulose Fibers Adds reinforcement to the adhesive Provides strength to the “ bonding layer ” of the cold modified system
Fillers Functional Increase Viscosity Adds Fire Retardant Improves UV Resistance/Weatherabilit y Thixotropy Non-Functional Add Bulk Reduces Product Cost
Thixotropy Thixotrophy is a fluid that becomes less viscous under shear Ketchup is Classic Example It is thick when sitting in a jar but when you shake the bottle it breaks down and flows more easily Advantages for Cold Adhesives that are Thixotropic: Easily Spreads or Sprays More Contact with Membrane Prevents Slippage of Membrane Won ’t Soak into Into Insulation/CoverBoard Holds Limestone in Suspension No Need to Stir Before Use
Thixotropy
Title/general heading 7 10 +4 6 10 +4 5 10 +4 4 10 +4 3 10 +4 2 10 +4 Thixotropy Thixotropic 1 10 +4 9 10 +3 8 10 +3 7 10 +3 6 10 +3 5 10 +3 1 10 -1 2 10 -1 5 10 -1 1 10 +0 2 10 +0 5 10 +0 1 10 +1 Shear rate 1/s 2 10 +1 5 10 +1 1 10 +2 Manual control Number of measurements 1 Measurement interval 2.000E+1 s Shear rate table Shear rate 1.000E-1 - 7.000E+2 1/s Delay time 1.500E+1 s Integration time 1.500E+1 s Operator Date 5/5/2014 Sample RR3 2 10 +2 5 10 +2 0 J:\2014 batches\1052 5/5/2014 Viscosity cb2 3/25/2014 Viscosity
Types of Polymer-Modified Adhesives Water-based Not good for roofing adhesion Dissolves when introduced to moisture Designed as an interior adhesive Solvent-based Withstands moisture Designed for exterior building envelope use
Types of Polymer-Modified Adhesives Solvent Solvent Solids High Solvent / Low Solid Toxic / High VOC Lower Softening Point Unable to walk on 55% Stays Behind Solids High Solid / Low Solvent Low VOC Higher Softening Point User/Environmentally Friendly 82% Stays Behind Meets SCAQMD and other OTC Requirements
Application Methods
5 Gallon Pails = squeegee 55 Gallon Drums = spray rig 350 Gallon Totes = spray rig
Application Methods
High Viscosity = Notched Squeegee Lower Viscosity = Spray Rig
Application Methods
Squeegee Method Uses 5 gallon pails Efficient for small areas Downside = landfill waste
Application Methods
55 gallon drums Easy to transport Landfill waste Option to line drum in order to upcycle/recycle 350 gallon totes Reusable Harder to transport
Climate / Temperature Considerations
Cold Adhesive must be applied at: A minimum of 65 o F for squeegee application 100 o F - 110 o F for spray application Achieved with use of mastic heater Cold weather recommendations: Hot Box on Roof, Stair Tower, Elevator Room
Application Considerations
Mastic Thickness Too thick Damages membrane Delays cure time Too thin Improper adhesion Normal Application Rate 1.5 – 2 gallons/sq. membrane to membrane 2 – 2.5 gallons/sq. membrane to substrate
Application Procedure
Relax Rolls Prior to Installation Prevents possible wrinkling Roofing Membranes Can Be Repositioned Prior to Adhesive Curing
Lap Welding Methods
•Only heat welding provides watertight application the same day −Electric hot air & roll −Torch & Roll
Lap Welding
Torch & Roller
Lap Welding
•
Electric Hot Air Welder
Lap Welding
Lap Welding
Finished Field Lap
Cure Time
Cure times vary dependent on: Ambient conditions Roof configurations and orientation Generally between 24 and 72 hours Watertight once laps are torched or heat welded
Considerations
Not all adhesives are interchangeable between APP & SBS Modified Bitumen membranes MUST have sand or liquid talc parting agent Polypropylene parting agent WILL prevent adhesion Polypropylene parting agent sheets are for TORCH USE ONLY!
Considerations
Membrane “ peel ” during cure time is more of concern than uplift Eliminate foot traffic on new membrane if a “ high solvent adhesive ” is used Damages membrane surface Displaces adhesive SBS more susceptible to surface damage than APP due to lower softening point
Considerations
• • • • Minimize odor from entering building Stage products downwind of the building, vents and air intakes Schedule work near air intakes when building in unoccupied Close or cover intakes only as needed Building Manager should communicate with building occupants
Benefits of Polymer-Modified Adhesives Health & Safety Accessibility Ease of Application Handling Protection Environmental
Benefits of Polymer-Modified Adhesives Health & Safety No Open Flame or Fire Risk No Kettle No Skin Burns Limited Fumes & Odor
Benefits of Polymer-Modified Adhesives Accessibility In tight constrained areas on Roof-top High-rise buildings
Benefits of Polymer-Modified Adhesives Ease of Application Increased Labor Productivity Smaller Crews Minimal Application Equipment Forgiving of Application Errors Clean Installation Year Round Application
Benefits of Polymer-Modified Adhesives Handling Transportation Storage Handling
Benefits of Polymer-Modified Adhesives Protection Redundant Ply ’s Watertight Added Thickness
Benefits of Polymer-Modified Adhesives Environmental Low VOC Meets SCAQMD UL/FM Approved
Drive for Cold Applied
• • • • • • • • • • • • Insurance Companies High Rise Buildings Low odor/no smoke No open flame Increased productivity LEED/RoofPoint EPA Clean Air Act Job site housekeeping Additional waterproofing layers User friendly Application Options Compatible with any size job
QUESTIONS
Thank You!
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