flashings fasteners & accessories
DESCRIPTION
TRANSCRIPT
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Flashings, Fasteners & Accessories
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Flashing Designs
Also Referred to as Trims Press/Folder Broke Strippable Film Applied Made Per Order in Shop Standard Shape, Custom Sizes 10’-0” Standard or up to 20’-0” Architectural “Box” Flashings Commercial Sculptured
Architectural / Residential / Commercial
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Press/Folder Broke Flashings
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Arch. / Res. Flashings
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Architectural Eave/Drip Edge
Note: Panel field hemmed.
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Architectural/Residential Gutter
Note: Post-hung gutter system.
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Architectural Valley
Note: Water diverter should equal panel rib height.
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Architectural Rake/Gable
Note: Rake/Gable flashings should be installed working from bottom to top of roof.
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Architectural Rake/Sidewall
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Architectural Ridge/Hip
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Vented Ridge
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Sculptured Commercial Flashings
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Commercial Gutters
Sculptured Post-Hung Gutter System
Box Pre-Hung Gutter System
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Flashing Packaging
Shrink Wrapped
Wood Crate
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Four questions to help determine the proper fastener:
1. What materials are being fastened?
2. What are the load requirements?
3. What are the service requirements?
4. What is the environment?
Fasteners/Screws
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• List each type of material (steel, wood, rigid insulation).
•List the thickness of each material. (Determines attachment thickness)
#1 What materials are being fastened?
Steel Purlin
Wood Decking Steel Decking
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Allow at least 3 threads to extend beyond all materials.(Screw will be at least 1/2” – 1” longer than attachment length.)
Attachment thickness + ½”
#1 What materials are being fastened?
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1. Uplift loadRelates to the pullout / tensile / pullover strength of the screw – washer.
2. Shear loadRelates to the shear strength / ductility of the screw.
ShearShear
TensileBending
Pullover
#2 What are the load requi rements?
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Is there...•Vibration?•Expansion & Contraction?•Prying on the Joint?
Identify conditions that can affect the screws performance.
#3 What are the service requirements?
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Determine...•Corrosion potential•Dissimilar metals
#4 What is the environment?
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1. CONCEALED FASTENER CONDITIONS
Fastener/Screw Applications
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2. EXPOSED FASTENER CONDITIONS
Fastener/Screw Applications
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To eliminate confusion and assure the proper fastener is used, specifications for tapping screws should be written to include:1. Thread diameter2. Threads per inch3. Screw Length4. Point Type5. Type of screw6. Drive size7. Head style8. Fastener material9. Finish / plating / corrosion resistance (salt spray)
Fastener/Screw Terminology
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Description: #12-14 x 1-1/4” DP2 Self-Drilling Screw. 5/16” Hex Washer Head. Undercut with EPDM Sealing Washer. Carbon Steel. Zinc Plated with 1,000hrs salt spray coating.
Head Style
Major Diameter
Threads Per Inch
Fastener Length
Point Type
#12 - 14 x 1-1/4” DP2 5/16” HWH
Major Diameter
Threads Per Inch
Fastener Length
Point Type
Head Style
Fastener/Screw Terminology
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2. “Fine” ThreadUse in thick metal
•Slower to install.
•Provides more thread engagement.
1. “Coarse” ThreadUse in thin metal and wood.
•“Steep” thread installs faster.
•“Steep” thread loosens more quickly.
Fastener Thread Types
TWO GENERAL TYPES OF THREADS
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Point Type Drilling ThicknessDP1 Thin (.018” - .090”)
DP2 Thin Medium (.035” - .140”)
DP3 Medium (.090” - .250”)
DP4 Medium/Heavy (.145” - .375”)
DP5 Heavy (.250” - .500”)A - DP1
Light Gauge(Thin Metal) B - DP5
Heavy Gauge
The thicker the material to be fastened, the larger the point “Type”.
Self Driller Point Types
B
A
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Flange Seal Head
Sealant MaterialsEPDM: Standard(Non conductive)
Neoprene: Petrochemical
• Optimal sealing performance when installed at an angle.
• Provides greater pullover strength.
• Nicer installed appearance.• Paint damage minimal.• More back-out resistance
Bonded Washers
Fastener/Screw Washer Types
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Material and Finish• 18-8 Stainless Steel (302, 304, 305, 316) - Passivated• 410 Stainless Steel – Passivated and Plated• 410 Stainless Steel – Passivated• Carbon Steel – Long-life Coated• Carbon Steel - Zinc Plated
Increased Corrosion Resistance
Zinc Plated
Fastener/Screw Corrosion
Long Life Coated Stainless Steel
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1/8” Pop RivetPop rivets are used to hold two pieces of sheet metal together, common at flashing laps, using a 2-Step method;
Step #1 - 1/8” Hole is Drilled Through both Pieces.
Step #2 - Insert Pop Rivet in Hole with Rivet Gun
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Standing Seam Panel Clips
1. Floating Clip:•Independent base and tab.•Used with panel lengths greater than 30’-0”.
TWO GENERAL TYPES OF CONCEALED CLIPS
2. Fixed Clip:•One solid piece.•Used with panel lengths less than 30’-0” or snap down panels.
Note: Base of floating clipshould be centered when installed.
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Thermal Expansion & ContractionDefinition: The natural characteristic of a length of metal to expand or contract relevant to a change in the metals temperature. Heat and sun expands/Cooling and shade contracts.
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SealantsTWO GENERAL FORMS OF SEALANT
1. Tube Sealant•Polyurethane based.•Average usage per tube of 25’-0”.
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Sealants
2. Roll/Tape Sealant•Double beaded butyl sealant•Roll lengths of 40’-0”.
TWO GENERAL FORMS OF SEALANT
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Roof Boots/Jacks
Note: Silicone boots used on high temp penetrations.