ESR-4725 — Boxabl Structural Insulated Panels
Complete technical specifications from the ICC-ES evaluation of Boxabl's proprietary SIP panel system. This data drives every foundation design we engineer.
Panel Description
Factory-laminated sandwich panels consisting of one steel facing and one magnesium oxide panel facing with an expanded polystyrene (EPS) foam core.
Wall Panel Thickness
6 inch (152.4 mm)
Roof & Floor Panel Thickness
7.5 inch (190.5 mm)
Properties Evaluated
Code Compliance
Panel Materials
EPS Foam Core
ASTM C578, Type I — flame-spread index ≤25, smoke-developed index ≤450 (ASTM E84)
Steel Exterior Facing
50 ksi (345 MPa) 24 ga. (0.73 mm) Steel with G60 galvanization coating and primer paint, 57" wide
MgO Interior Facing
0.236-inch (6 mm) thick magnesium oxide (MgO) board, 48" wide — ICC-ES AC386 compliant
Adhesive
Type II, Class 2 — ICC-ES AC05 compliant
Transverse Load Capacity (psf)
| Panel Configuration | L/180 | L/240 | L/360 |
|---|---|---|---|
| Floor/Roof Panel, Positive Wind | 31.3 | 31.3 | 31.3 |
| Floor/Roof Panel, Negative Wind | 86.7 | 86.7 | 63.5 |
| Wall Panel, Positive Wind | 38.3 | 38.3 | 38.3 |
| Wall Panel, Negative Wind | 36.6 | 36.6 | 36.6 |
Axial Load Capacity
2,200 plf (113.875-inch wall height)
Shearwall (Seismic A-C)
349 plf (1:1 h:w aspect ratio)
Shearwall (Seismic D-F)
127 plf (1:1 h:w aspect ratio)
Seismic Design Factors
Categories A, B, C
Categories D through F
Fire Safety & Weather Resistance
Interior Finish / Thermal Barrier
Class A per ASTM E84 — meets IBC 2603.9, no additional thermal barrier required per IBC 2603.4
Weather Resistive Barrier
Meets IBC Section 1402.2 Exception 2 — no additional weather protection required
Why This Matters for Your Foundation
The SIP panel system's load ratings, seismic design factors, and connection details directly influence how we engineer your foundation. Our PE-stamped plans account for these manufacturer specifications to ensure your foundation properly supports the Boxabl structure under all applicable loading conditions.