Technical Specifications - LeepCore™ Steel SIP

Summary

• Structural Insulated Panel (Steel SIP) ...
• Roll-formed geometric coated steel with foam core
• 24-inch wide panels
• Custom cut up to 12 feet in height (up to 30’ design under development)
• Peerless core/skin interface bond, unbroken in 10 years of testing
• E-72 load-bearing frameless tongue and groove construction
• High speed erection
• Tested to meet category 5 hurricane winds
• Lightweight, only 3 pounds per square foot
• 2.5" x 4" integral roll-formed channel
• Highest strength-to-weight-ratio of any structural building component
• R-25+ insulating value; no other vapor barrier or insulation required
  • Note also: 75% of thermal energy is lost through frame members. LeepCore load-bearing walls do not require frames, eliminating thermal bridges that are common to wood and metal frame construction.
• Full weather envelope thermal break
• Water impermeable (including waterproof polyurethane foam core)
• Termite, insect, rodent, pest, mold, mildew, and rot proof
• Fire, wind, earthquake, corrosion, acid, chemical resistant
• Design agnostic : deploy factory baked polyester coating with deep embossed stucco pattern, or can accept any cladding or finish
• Formaldehyde free
• Near zero maintenance
• High resiliency (bends but does not break – failure is not catastrophic – returns to form after loads are removed)
• Highly sound abating, with optional soundproof deployment

Cross-Section Diagram

Steel Skin

• G-40 Zinc Galvanized Coating (Zero Spangle)
• Free from Surface Blemishes
• ASTM - A653 - (LFQ) (Lock Forming Quality)
• Surface is a baked on Polyester System:
  • Top/Outside - 1 Mil (1/1000 inch) White Polyester Coat
    • .2 Mil Primer plus .8 Mil Regular
  • Bottom/Inside - 0.5 Mil White Polyester Coat
    • .2 Mil Primer plus .3 Mil Regular
• Skin Thickness: 0.019” +/- 0.0015”
• Split Widths:
  • Top: 30.87” +/- 0.0625
  • Bottom: 35.48” +/- 0.0625
• Deep Embossed to 0.034 +/- 0.0015 - Non Directional Stucco Pattern
• Quality Parameters:
  • Chamber: .0625 inches in 12 ft.
  • Edge Wave: 0.125 inches in 12 ft.
  • Oil Canning: None
  • Mill Edge: Painted and Free of Burrs

Foam Core

Class 1, two component, co-blown modified polyurethane foam system, as tested by UL 723 (ASTM E – 84 Tunnel Test), with the following characteristics:

• 4" Polyurethane Foam Core
• Thermal Conductivity (ASTM C 518). K Factor = 0.130 (avg.)
• Compressive Strength (ASTM D 1621) @ 2.2 lb./cu. ft.
  • Parallel to Rise - STR 10% 23.08 psi (avg.)
  • Perpendicular to Rise - STR 10% 20.62 psi (avg.)
• Dimensional Stability (ASTM D 2126) @ 28 days, avg. volume change:
  • 70 deg. C / 100% Humidity - 3.7%
  • 100 deg. C / Ambient - 1.8%
  • -30 deg. C / Ambient - 0.1%

Structural Performance

Composite structure capable of withstanding ultimate loads and deflections, as per ASTM E-72, as follows:

• Average Axial Load (wall)
  • Ultimate - 6,313 lb./linear foot of wall
• Average Transverse Load (wall)
  • Ultimate - 139 lb./sq. ft. (positive), 113 lb./sq. ft. (negative)
  • L/180 - 64 lb./sq. ft. (positive), 61 lb./sq. ft. (negative)
• Average Transverse Load (wall, negative direction)
  • Ultimate - 185 lb./sq. ft.
  • L/180 - 110 lb./sq. ft.
  • L/240 - 86 lb./sq. ft.
  • L/360 - 60 lb./sq. ft.
• Average Transverse Load (floor)
  • Ultimate - 395 lb./sq. ft.
  • L/180 - 202 lb./sq. ft.
  • L/240 - 160 lb/sq. ft.
  • L/360 - 105 lb./sq. ft.
• Average Racking Shear Load (In-plane)
  • Ultimate load (lbs.) - 9,033
  • Ultimate Load (lbs./linear ft.) - 1,506
  • Load at 1/8” net deflection (lbs.) - 5,349
  • Load at 1/8” net deflection (lbs./linear ft.) - 892
• Dade County Airborne Missile Test:
  • Test specification: 9 pound wood 2X4 "missile", shot at wall at 34 mph, must not penetrate wall.
  • Result: No penetration at 81 mph; far in excess of requirement.

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