the devil is in the details edc1
TRANSCRIPT
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Credit earned on completion of this course will be reported to AIA CES for AIA members. To receive a Certificate of Completion you must complete and pass the 10 question quiz following this presentation with an 80% or higher, then a certificate of completion will be available for immediate download.
This course 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 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.
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Learning Objectives
Attendees will learn that long term roof system performance requires long term thinking when designing details incorporated into a metal roof system.
Attendees will be visually exposed to both correct and incorrect details and conditions that are best avoided when possible.
Attendees will learn how roof penetrations should be specified and installed to provide long term weathertightness.
Attendees will learn about dissimilar metals and how they affect a roof’s service life.
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Ridge Detail
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Ridge Detail
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Ridge Detail
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Two Basic Principles
Think Long Term (20 Years) • Don’t count on exposed sealant to be a long-term solution. • Use trim, fasteners and accessories that will last as long as the roof.
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Rusted Fasteners
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Rusted Valley Gutter
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Rusted Flashing
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Two Basic Principles
Think 20 Years Down The Road The Harder You Make Something, The Less Chance It
Will Be Done Right
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Penetrations • Roof Curbs
Where Do Metal Roofs Leak?
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Roof Curbs
Use curbs made from aluminum or stainless steel Use under/over curbs Require a minimum of 12” between the panel end
and the diverter on the upslope end and 6” between the curb sides and panel seams
Use rib-to-rib curbs Require roof contractor to supply and install curbs,
not the HVAC contractor.
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Roof Curb
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Roof Curb
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Roof Curb
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Roof Curb
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Roof Curb
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Roof Curb
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Penetrations • Roof Curbs • Pipes/Structural Members
Where Do Metal Roofs Leak?
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Pipe/Structural Penetrations
Do not use residential pipe jacks Do not penetrate the panel seam Do not block the flow of water Require the roofing contractor to install or supervise
all pipe and structural penetrations
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Incorrect Pipe Jack
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Incorrect Pipe Jack
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Incorrect Installation
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Correct Pipe Penetration
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Incorrect Installation
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Curb Base
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Correct Pipe Penetration
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Correct Pipe Penetration
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations By Other Trades
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Penetrations Details
Where Do Metal Roofs Leak?
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Details Valley
Use a vertical leg SSR when possible Use a valley trim that is wide enough to
handle the flow of water. At fixed eave valleys, use triple bead tape
sealer and place fasteners at a close enough spacing to prevent “fish mouthing”
Do not use offset cleat method on roofs with low pitches
Seal the ends of the panel seams Never use a starter “J”
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Incorrect Bevel Cutting
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Correct Bevel Cutting
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Vertical Rib Panel Installation
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Offset Cleat
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Trim Intersections
Seal properly between trim pieces Shingle trim where required Make attachments “in the high” when you can
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Valley Intersection At Upslope End Of Dormer
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Valley Intersection At Upslope End Of Dormer
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Valley Intersection At Upslope End Of Dormer
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Ridge/Hip/Hip Intersection
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Plan Review
Dead Valley
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Details Dead Valley
Create an endlap in the roof panel where the valley trim terminates
Try to lay out panels so a panel seam does not hit at the valley termination point
You may need to press break a special panel
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Dead Valley
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Dead Valley
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Dead Valley
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Dead Valley
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Dead Valley
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Dead Valley
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Plan Review
Eave
Offset
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Details Eave Offset
On short offsets, consider using gutter in lieu of rake trim
On long offsets, install a slip joint to allow for the differential in thermal movement
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Eave Offset
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Eave Offset
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Eave Offset
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Eave Offset
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Plan Review
Ridge
Ridge
Ridge Offset
Dutch Hip
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Details Ridge Offset
Where possible, fix the roof at the ridge and use a simple ridge flash
Install an EPDM membrane under the trim intersection at the ridge
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Ridge Offset
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Ridge Offset
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Details Parapet Walls
Allow for thermal movement Surface mount counter flashing is the least likely
method to stay watertight Build in redundancy at “less than perfect conditions” Use welded aluminum crickets and other
appurtances where needed
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Ridge/Parapet Intersection
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Ridge/Parapet Intersection
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High Eave/Parapet Intersection
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High Eave/Parapet Intersection
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Low Eave/Parapet Intersection
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Parapet Offset
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Parapet Offset
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Details Roof Transitions
Try to keep transitions outside the building envelope If this is not possible, seal the wall area with metal or
a waterproof membrane before installing the roof Use with caution in areas that experience heavy ice
and snow
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Roof Transition
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Roof Transition
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Other Areas Of Concern
Corrosion • Cutting Metal Panels
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Corrosion From Improper Cutting Of Panels
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Rust Debris From Cutting Panles On Roof
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Other Areas Of Concern
Corrosion • Cutting Metal Panels • Dissimilar Metals
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Lead Roof Jack
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Graphite On Roof
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Copper Lightning Cable
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Copper
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AC Condensate
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AC Condensate
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Treated Wood
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Treated Wood
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S-5! Clamps
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Other Areas Of Concern
Corrosion • Cutting Metal Panels • Dissimilar Metals
Underlayments
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Felt Underlayment
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Felt Underlayment
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Felt Underlayment
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Other Areas Of Concern
Corrosion • Cutting Metal Panels • Dissimilar Metals • Improper Repairs
Ice And Snow
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THANK YOU FOR YOUR ATTENDANCE
QUESTIONS?
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This concludes the American Institute of Architects Continuing Education Systems Program