Comparison of metal deck topped with either regular concrete or 110 pcf lightweight concrete vs. EICRS
The concrete systems provide high shear resistance, fire rating, but at a considerably greater weight.
EICRS provides required insulation value Fire Rating and less weight - only 8 psf.
Comparison
 |
|
|
| |
EICRS |
Concrete on Steel Deck |
| Weight |
8 psf |
35-45 psf |
|
| Insulation |
Included in system |
Needs ISO board or batt insulation |
|
Below deck
fireproofing |
Not required per UL P921 |
Not required - i.e., UL - D916 |
|
| Est. cost R-19 |
|
| Concrete Topping |
$3.00 - |
$4.50 sq. ft. |
| Insulation |
$1.00 - |
$1.50 |
| |
|
| |
$4.00 - |
$6.00 sq. ft. |
|
|
The difference in cost more than compensates for the heavier gauge steel that may be required.
Remember - with B deck EICRS can stiffen deck and provide high shear values (ICBO 3081). Conclusion - High insulation value, comparable fire rating and low weight will provide an overall savings.
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