Concrete inFocus - Spring 2017 - 23

Floor and Roof Systems

Initial Cost and Long-Term Value

There are many options for floor systems that integrate well with
ICF wall systems. ICF walls are simply concrete bearing walls, so any
floor system that is used for other types of bearing wall construction
can be used in combination with ICF wall systems. These include traditionally formed reinforced concrete slabs, ICF slabs, precast hollowcore plank, concrete on metal deck combined with steel joists or cold
formed joists. Wood framing systems for floor construction can also
be adapted for connection to ICF walls using embedded ledger bolts.

ICF construction can help contain construction
costs because of the inherent efficiencies of the
installed assembly that serves nine functions:
1. Concrete form (that stays in place)
2. Thermal barrier
3. Air barrier
4. Moisture barrier
5. Fire barrier
6. Sound barrier
7. Substrate for running utilities
8. Substrate for attaching finish materials
9. Reinforced concrete structure

ICF Floor and Roof Systems
There are several manufacturers of ICF floor and roof systems that
have similar configurations. Just like ICF wall systems, ICF decks
combine EPS insulation with reinforced concrete to form a strong
and energy efficient floor or roof system. Ideal for use in both commercial and residential construction, ICF floors combine the strength,
security and reliability of reinforced concrete with energy efficiency,
fast construction and comfort. Many of the ICF wall system manufacturers carry a version of ICF floor and roof system that interfaces
well with their wall system.
Each of the EPS panels (up to about 30 feet long), are supported
and reinforced with integral cold formed steel beams or channels
molded into the EPS along the length of each panel. The result is a
joist and deck forming system that provides the maximum strength
of a reinforced concrete deck with minimal materials and labor. The
bottom side of each panel is typically flat but the top side has channels
along the length of the panel that provide a void for reinforcement
and concrete to be placed. The resultant concrete system is similar to
a typical concrete joist system with joists spaced at about 24 inches
on center and a slab in between the joists from 2 to 6 inches thick.
The ICF floors and roofs can span up to about 30 feet, depending on the depth of each joist. The joist system is designed like any
other concrete joist system with bending reinforcement placed in the
bottom of the joists, shear reinforcement placed in the webs and top
steel placed for shrinkage and crack control. Although ICF floors are
usually designed as simply supported one-way slab systems spanning

between ICF walls, they could be designed as multispan floors with
intermediate supports by adding top bending steel.
The EPS material, reinforcing steel and concrete are the same as
those used for ICF walls. The bottom surface of the ICF floor or
roof is finished with gypsum board by screwing into the embedded
metal channels. The top surface is a smooth concrete surface ready
for any finish material such as carpet, wood or tile. When used for a
roof structure any appropriate roofing system can be used, including
membranes, inverted roof insulation or even vegetated roof assemblies.

Precast Hollow-Core Plank
Another popular floor system, especially for multifamily construction, is precast hollow-core plank. Typically, ICF walls are installed
one story at a time (including concrete) and then precast planks are
placed on top of the walls, bearing directly on the concrete. Sometimes
a concrete topping is placed on the plank or a thin leveling layer is used
to even out the floor to accommodate any finish. For some buildings,
the ceiling is simply painted or parged with plaster and painted to
conceal the joints between planks. There are dozens of hollow-core
plank manufacturers around the U.S. and Canada that can supply
product for ICF projects and several have developed special details
specifically for ICF construction.

Concrete on Metal Deck, Steel Joists
and Cold Formed Joists
Concrete on metal deck combined with steel joists
or cold formed joists are another option for ICF wall
systems. There are numerous steel joist and cold formed
joist manufacturers that have designed systems specifically to integrate with ICF walls. Some provide a steel
bar joist system with concrete on metal deck along with
other concrete deck systems. Others make a cold formed
joist and concrete deck system for ICF walls. These systems
offer the advantage of having space for mechanical and electrical
within the ceiling cavity. For multifamily residential, the mechanical
and electrical are often limited to the kitchen and bath areas so having space in the ceiling cavity is not as critical. For other occupancy
types, however, having open ceiling space may be a distinct advantage.
Typical ICF wall to floor/roof connection detail. Image courtesy of Quad-Lock®.
concrete INFOCUS

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23



Table of Contents for the Digital Edition of Concrete inFocus - Spring 2017

From the President’s Desk
Corporate Suite Column
Enviroscene Column
Strong and Efficient: Insulating Concrete Forms for Multifamily Residential Construction
Cut the Cost of Workers’ Compensation Insurance in the Concrete Industry
Engineering: Specifications for Concrete Construction
Predicting the Potential for Plastic Shrinkage Cracks
2017 Product Preview
Index of Advertisers
Concrete inFocus - Spring 2017 - belly1
Concrete inFocus - Spring 2017 - belly2
Concrete inFocus - Spring 2017 - cover1
Concrete inFocus - Spring 2017 - cover2
Concrete inFocus - Spring 2017 - 3
Concrete inFocus - Spring 2017 - 4
Concrete inFocus - Spring 2017 - 5
Concrete inFocus - Spring 2017 - 6
Concrete inFocus - Spring 2017 - 7
Concrete inFocus - Spring 2017 - 8
Concrete inFocus - Spring 2017 - 9
Concrete inFocus - Spring 2017 - 10
Concrete inFocus - Spring 2017 - From the President’s Desk
Concrete inFocus - Spring 2017 - 12
Concrete inFocus - Spring 2017 - Corporate Suite Column
Concrete inFocus - Spring 2017 - 14
Concrete inFocus - Spring 2017 - 15
Concrete inFocus - Spring 2017 - Enviroscene Column
Concrete inFocus - Spring 2017 - 17
Concrete inFocus - Spring 2017 - Strong and Efficient: Insulating Concrete Forms for Multifamily Residential Construction
Concrete inFocus - Spring 2017 - 19
Concrete inFocus - Spring 2017 - 20
Concrete inFocus - Spring 2017 - 21
Concrete inFocus - Spring 2017 - 22
Concrete inFocus - Spring 2017 - 23
Concrete inFocus - Spring 2017 - 24
Concrete inFocus - Spring 2017 - 25
Concrete inFocus - Spring 2017 - 26
Concrete inFocus - Spring 2017 - 27
Concrete inFocus - Spring 2017 - 28
Concrete inFocus - Spring 2017 - 29
Concrete inFocus - Spring 2017 - 30
Concrete inFocus - Spring 2017 - Cut the Cost of Workers’ Compensation Insurance in the Concrete Industry
Concrete inFocus - Spring 2017 - 32
Concrete inFocus - Spring 2017 - 33
Concrete inFocus - Spring 2017 - 34
Concrete inFocus - Spring 2017 - 35
Concrete inFocus - Spring 2017 - 36
Concrete inFocus - Spring 2017 - Engineering: Specifications for Concrete Construction
Concrete inFocus - Spring 2017 - 38
Concrete inFocus - Spring 2017 - 39
Concrete inFocus - Spring 2017 - 40
Concrete inFocus - Spring 2017 - Predicting the Potential for Plastic Shrinkage Cracks
Concrete inFocus - Spring 2017 - 42
Concrete inFocus - Spring 2017 - 43
Concrete inFocus - Spring 2017 - 44
Concrete inFocus - Spring 2017 - 45
Concrete inFocus - Spring 2017 - 2017 Product Preview
Concrete inFocus - Spring 2017 - 47
Concrete inFocus - Spring 2017 - 48
Concrete inFocus - Spring 2017 - 49
Concrete inFocus - Spring 2017 - 50
Concrete inFocus - Spring 2017 - 51
Concrete inFocus - Spring 2017 - 52
Concrete inFocus - Spring 2017 - 53
Concrete inFocus - Spring 2017 - Index of Advertisers
Concrete inFocus - Spring 2017 - cover3
Concrete inFocus - Spring 2017 - cover4
Concrete inFocus - Spring 2017 - divider1
Concrete inFocus - Spring 2017 - divider2
Concrete inFocus - Spring 2017 - 57
Concrete inFocus - Spring 2017 - 58
Concrete inFocus - Spring 2017 - 59
Concrete inFocus - Spring 2017 - 60
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