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ROOF DECKSROOF DECKS
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ROOF DECKS
Objectives:
• Functions of Roof Decks
• Types of Decks
• Slopes and Drainage
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Deck Function
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FUNCTIONAs part of the roof assembly the deck should
be designed to provide:
Structural support
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Structural Support
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Structural SupportA deck transfers the weight of live and dead loads
to supporting framing members.
• Joist
• Purlins
• Subpurlins
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Example of a PURLIN
Sub Purlin
What’s wrong with this picture?
Purlin
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Structural Support
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FUNCTIONDimensional Stability
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Expansion Joint on a Road.
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Dimensional StabilityDecks must Accommodate Building Movement
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FUNCTIONFire Resistance
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FUNCTIONAttachment
Show Ballooned EPDM
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ATTACHMENTDid this deck stand up to the high winds?
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SLOPE & DRAINAGE
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SLOPE & DRAINAGESlope is provided by:
Sloping the structural framing
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SLOPE & DRAINAGE
Slope is provided by:
Sloping the structural
framing
Tapered insulation
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SLOPE & DRAINAGESlope is provided by:
Sloping the structural framing
Tapered insulation
Insulating fills
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Expanded Polystyrene (EPS)
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SLOPE & DRAINAGE
Slope is provided by:
Sloping the structural
framing
Tapered insulation
Insulating fills
Combinations of the
above
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SLOPE & DRAINAGE
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DEFLECTION
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DECK DEFLECTION
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BUILDING & ROOF MOVEMENTS
Video Welcome to Canam1
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EXPANSION JOINTS
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EXPANSION JOINTSWhat should be considered in the design and
placement of expansion joints?
• The building's thermal movement characteristics
• The structural supports and roof deck
• The roof system selected
• The climatic conditions
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EXPANSION JOINTSWhere should we install expansion joints?
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AREA DIVIDERSAlso called ‘Control Joints’ or ‘Relief Joints’What’s the difference between an expansion joint and
area divider?
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DECK TYPESThe most common types are:
• Cementitious wood-fiber deck panels
• Lightweight insulating concrete and fills
• Poured gypsum concrete
• Precast gypsum panel
• Steel
• Structural concrete (cast-in-place, post-tensioned and precast/prestressed)
• Thermosetting insulating fills
• Wood-plank and structural wood-panel decks
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STRUCTURAL CONCRETE• The three general types of structural concrete
roof decks are:– Cast-in-place - Concretes that are cast on a job-site
over form material and are reinforced with steel bar and/or wire mesh embedded in a deck.
– Post-tensioned - Reinforcement cables or tendons are tensioned after the concrete has been cast and taken a set.
– Precast/prestressed - Cast at a manufacturing facility and transported to a job site.
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STRUCTURAL CONCRETE DECKS
Cast in place concrete roof decks
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POST TENSIONED CONCRETE
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PRE-STRESSED CONCRETE
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PRECAST/PRE-STRESSED CONCRETE
3. WHEN THE STRANDS ARE CUT, THE CONCRETE GOES INTO COMPRESSION AND THE BEAMTAKES ON A CAMBER ENABLING THE MEMBER TO ACCOMMODATE GREATER LOADING.
2. CONCRETE IS CAST AROUND THE STRETCHED STRANDS AND CURED.
THE CONCRETE BONDS TO THE STRANDS.
1. THE FIRST STEP IN PRETENSIONING IS TO STRETCH THE STEEL PRESTRESSING STRANDS TIGHTLY ACROSS THE CASTING BED.
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PRESTRESSED CONCRETE DECK UNITS
SOLID SLAB
HOLLOW CORE SLAB
DOUBLE TEE SINGLE TEE
Mr. T
Wake up fool & listen to the instructor!
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Lightweight Insulating Concrete
Expanded Polystyrene (EPS)
Expanded Polystyrene (EPS)
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Lightweight Insulating Concrete
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PRECAST CONCRETE
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PRECAST CONCRETE
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DECK TYPESCementitious wood-fiber deck panels
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Cementitious Wood-Fiber Deck Panels
• Lightweight insulating concrete & fills
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DECK TYPES
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WOOD-PLANK DECKS
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TONGUE & GROOVE
Tongue
Groove
Bead
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WOOD-PLANK DECKS
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PLYWOOD & ORIENTED STRAND BOARD (OSB) DECKS
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WOOD DECKS
MoldFire
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STEEL DECKS
Show: N.J Roofers Falls 40’
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STEEL DECKS
Flange
Rib
Flange
Rib
Flute
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STEEL DECKS
RibDepth
Rib
Rib Width
Web
Rib Spacing Flute
DimensionFlange
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STEEL DECKS
30”
3/8” Minimum
Approximately6”
1 ½”Nominal
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STEEL DECK
30”
1 ¾”
½” Minimum
6”
1 ½” Nominal
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STEEL DECKS
30”
6”
1 ½” Nominal
1 ¾” Minimum
2 ½”
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STEEL DECKS
1 ½”Minimum
Approximately8”
3”
Nominal
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STEEL DECK REPAIRS
Attach plate to deck (4 Fasteners Minimum)
Metal deck panels with multiply openings may require supplemental framing designed by an engineer
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WOOD NAILERS & CURBS
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Thank You