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??...

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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!