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EmailFlute Span Table for EPS Roof Insulation
December 31, 1899
| December 17, 1997 | |
| Subject: | FLUTE SPAN TABLE FOR EPS ROOF INSULATION |
| From: | JOE TOMASELLI, TECHNICAL CONSULTANT |
The minimum thickness of EPS Roof Insulation requied to span a given steel roof deck flute distance can be determined by multiplying the flute span distance by the constant shown below for the density of EPS to be utilized. The formula given assumes normally occurring roof traffic conditions during installation with proper staging. For loose laid and ballasted single-ply applications, temporary roof traffic boards (i.e., 5/8 in. plywood) are required.
| Nominal Density* | Constant (Multiplier) |
Steel Roof Deck Type |
Flute Span Distance |
| 1.00 PCF | 1.25 | Type A | Max 1.00 in. |
| 1.25 PCF | 1.15 | Type F | Max 1.75 in. |
| 1.50 PCF | 1.05 | Type B/BW | Max 2.50 in. |
Example:
A Type F steel deck has a flute span of 1.75 in., the necessary thickness of EPS @ 1.0 PCF density would be:
| Nominal EPS Density | Flute Span | Multiplier | Minimum EPS Thickness | ||
| 1.00 PCF | 1.75 in. | x | 1.25 | = | 2.2 in. |
This formula is for EPS alone (without cover board). When approved cover boards are used, the minimum EPS thickness can be 1 in. for all densities.
This formula is used for steel roof deck conditions where EPS thicknesses of 3 in. or less are required. These recommendations are intended to resist EPS fracture. Some minor deformation may occur in heavy traffic areas.
EPS Molders Association Home Page
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