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Transcript of Metal Deck 101crsmca.starchapter.com/images/downloads/Training/metaldeck101_012020.pdfMetal Deck is...
Metal Deck 101:
Metal Deck
Replacement
January 15, 2020
Presented by: Michael Polizzi
A.C.T. Metal Deck Supply
• What Is Metal Deck?• Commercial Roofers & Metal Deck• Types, Gauge, Finish & Quantity• Corrosion Protection & Proper Handling• Matching Obsolete or “Extinct” Metal Decks• Specialty Decks• Metal Deck for Concrete• Accessories• Fastening• Submittals and Specifications• 33 ksi vs. 80 ksi steel• What Metal Deck Is NOT• Questions and Discussion
• Quiz…
Overview
Metal Deck is a Structural Product
It is Not an Architectural Finished Product
(Most often not intended to be exposed with finished paint)
Steel Bar Joist, Beams or Purlins
Roofing System On Top of Metal Deck
How & Why Is Metal Deck Used
In The Roofing Industry??...
What I Need To Know:
• Type• Gauge• Finish• Quantity
Square Footage
Type Of Deck
Know Your Dimensions:
Flute (low)
Rib (high)
Depth
• Depth of Deck• Rib to Rib • Top & Bottom
of Flute
‘B’ Deck ProfileWide Rib Deck (WR)
‘F’ Deck ProfileIntermediate Deck (IR)
(Fits inside B Deck)
‘A’ Deck ProfileNarrow Rib Deck (NR)(Fits Inside F & B Deck)
‘N’ Deck ProfileDeep Rib Deck
Gauge
Roof Deck Starts at 22 Gauge*
Common Finishes
• Prime Painted–Gray –Gray w/ White
Bottom• Galvanized
–G60–G90
• Galvanized & Factory Applied Primer
• Stainless Steel
“Prime paints by nature are impermanent and provisional. Prime paint alone will only protect the
steel for a short period of time under ordinary exterior atmospheric conditions. If appearance of the finished deck is important, the Designer should
consider a field applied finished paint. Finish painting and its compatibility with the prime paint
is not the responsibility of the deck supplier.”
- sdi Roof Deck Design Manual
“A galvanized finish consists of a layer of zinc on top of a thin layer of zinc iron alloy. A zinc coating
offers corrosion resistance (relative to the base of the steel) due to its self-sacrificial characteristics. Zinc is a anodic to steel, which causes moisture,
chlorides, and sulfides to attack and oxidize the zinc before the steel. Secondarily, the zinc coating
provides a barrier between the steel substrate and the environment.”
- sdi Roof Deck Design Manual 2016
“Site Storage: Steel deck shall be stored off the ground with
one end elevated to provide drainage, and shall be protected from the elements with a waterproof covering, ventilated to avoid condensation.” - sdi Design Manual
SDI White Paper SDCP: “A Rational Approach to Steel Deck Corrosion Protection”
Items sited:
• Fewer protective lubricants: OSHA• Recommend not delivering until ready to install• Freeze-thaw cycles• Regional/seasonal/damp conditions• Presence of corrosive materials incl. road salt
Rust Staining
Quantity
• Total square footage needed (squares = 10’x10’)
• Size of areas to cover
• Square foot price – account for unknown or potential areas
• Exact cut list
* Joist spacing is often helpful information
Matching Existing:Know Your Dimensions!
The Culprit – Circa 1967 and Earlier
The Culprit – Circa 1967
“F” Fits Into “B” “A” Fits Into Both “F” & “B”
Interlocking vs. Nesting Sidelaps
• West Coast / Seismic deck is interlocking
• Some old profiles from Eastern U.S.
• Must confirm exact profile when nesting Specialty decks
AcousticCellular
Long-Span
Dovetail
Specialty Decks
Metal Deck for Lightweight Concrete
Roof Systems“Form Deck”
Metal Deck for Lightweight Concrete Roof Systems“Form Deck”
If Matching Existing:You Must Measure The Rib to Rib Dimensions –
MANY VERSIONS
Vented Form Deck(Drain Moisture)
Composite Floor Decks
Metal Deck Accessories
Rubber Closure
Sump Pan
Side Lap Screw
Weld Washer
Joist Screw
Acoustic Insulation Batts
Fastening SystemsPins
Welds
Typical Fastening Patterns
Typical Fastening Patterns
36/4 = 12” Fastening = Every Other Rib
36/7 = 6” Fastening = Every Rib
Example: 6’0 SpanSidelaps at 24” = Two Sidelaps = W/2
Speak The Same Language…
Interlocking vs. Nesting Sidelaps
• West Coast / Seismic deck is interlocking
• Button Punch Tool or Crimper used for sidelaps
Load Tables/Data Sheets
Primary product submittal
Metal Deck SpecificationsDivision 5 - 5300
33 Vs. 80 KSI Steel…• Consult an experienced, licensed
design professional• The affect of wind uplift design
guidelines related to:• Roof System Selection• Fastener Row Spacing• Direction of rows• Metal Deck
• 33 ksi vs. 80 ksi (33 ksi is SDI minimum requirement)
• Gauge of deck• Buildings are not being designed
with D5 & D7 together• Reroofing/ unable to verify
existing steel yield strength• Consult an experienced, licensed
design professional
• Orange
• A Metal Building
• A Standing Seam Roof
• Finished Paint with Warranty
• An Architectural Panel
Metal Deck Is Not…(An Architectural Panel)
Similar Well-Known Architectural Panels
Similar Well-KnownArchitectural Panels
Primary Profiles
Questions?
Comments?
• Metal Deck is a Structural Product
• Type, Gauge, Finish & Quantity
• A, F, B & N – Form Decks 9/16”, 1”, 1-5/16”, 1 ½”
• “F Deck” fits in “B Deck” “A Deck” fits in both “F” & “B Deck”
• Know Your Dimensions!
• Galvanized or PRIME Painted – Protect it
• Fastening: With What and Where Exactly
• Metal Deck is NOT an Architectural Panel
Review
Great Job!
1. Is metal deck a structural or architectural panel? ____________________
2. Name the three most common types of metal roof deck ___________________________________
3. What are the two primary finishes for metal deck? ___________________ __________________
4. Name one architectural panel ______________________________
5. Which deck profile fits in which other two profiles –by name? __________________________________6. Explain 36/4 w/2
____________________________________7. What four things are needed to order metal deck?
_____________ _____________ _______________ ___________
Michael Polizzi
A.C.T. Metal Deck Supply
800-894-7741
www.metaldecksupply.com
Know Your Dimensions!