ICF Suspended Concrete Floors & Roofs

Presentation by

Douglas Bennion

ICF Industry Partnership

• ICF manufacturers

• Ready-mixed Concrete

Industry

• More high-performance

concrete buildings

Insulating Concrete Formwork

ICF Products

3

ICF Floor & Roof Construction

4

ICF/Concrete Building Shell

Walls Floors

Roofs

5

© 2013 Quad-Lock Building Systems, Ltd

ICF Progress in the Market

6

How Does It Work?

…just like a floor joist!

7

A “Pan Form” for T-Beam Panel Construction

8

How Does It Work?

“One-way” Slab Design

9

• Resists shear and bending forces

• 40% lower mass reduces accelerated loads

• Long span capacity (30’ +)

T-Beam Evolution

10

COMPRESSION

NEUTRAL

TENSION

LEAVE AS IS

MINIMIZE THIS SECTION

ADD REBAR

COMPRESSION

NEUTRAL

TENSION

LEAVE AS IS

MINIMIZE THIS SECTION

ADD REBAR

COMPRESSION

NEUTRAL

TENSION

LEAVE AS IS

MINIMIZE THIS SECTION

ADD REBAR

COMPRESSION

NEUTRAL

TENSION

LEAVE AS IS

MINIMIZE THIS SECTION

ADD REBAR

Two Important Design Concepts:

“Two-way” versus “One-way” slab reinforcement Where is the load carried to?

“Flat-plate” design versus “Voided” slab Can we eliminate unnecessary materials?

Conventional Suspended Slab

• “Two-way reinforcement

• Carries loads to all edges

• Highest mass option

• Largest supporting

elements

“One-Way” Voided Elevated Slab

• “One-way” reinforcement

• Carries loads to two edges

only

• Lowest mass option

eliminates more concrete

• Reduces steel

consumption

• Requires smallest

supporting elements

Best overall efficiency in design

Increase Spans By:

14

• Adding supporting beams

• Increasing height of T-beams

• Post-tensioning

Typical Floor-to-Wall Connections

15

Multiple Family Occupancies

16

7.6 m (25‘) Single Span: 280mm (11“) QD + 64mm (2.5“) Slab

@ 50 psf LL

Concrete needed 14 cu.M

Top Reinforcement 6x6 WWM 130 kg

Bottom Reinforcement 2-19m @ 610 O.C. 1308 kg

Quad-Deck Z-Strips Spaced @ 305 O.C. 408 kg

1846 kg

7.6 m (25‘) Single Span: 203mm (8“) Conc. Slab

@ 50 psf LL

Concrete needed 28 cu.M

Top Reinforcement 13m @ 305 O.C. E/W 850 kg

Bottom Reinforcement 19m @ 305 O.C. E/W 1910 kg

2760 kg

Compare Concrete Slab vs. Quad-Deck

68,200 kg

34,100 kg

Elevated Slabs

Resist Storm Surge

Elevated SFR – Treasure Isle, LA

Elevated SFR – Treasure Isle, LA

Residence Building Facts:

• Post-Katrina rebuild

• ICF/ concrete “sandwich” (Floor – Walls – Roof)

• Compliant to IRC, ACI-318, & ASCE-24

• Seismic zone ‘A’

• Wind 130mph – Exposure C

• 20’-2” above MSL

• 13’-6” above grade

• BFE = 15’ above MSL

• Helical piers to 31’6” below grade

• Frangible parking slab

• Exceeds IECC 2012 insulation requirements

ICF Suspended Concrete Floors/Roofs

20

Questions?