Technical Data

To make the lives of designers and engineers easier we are providing the structural data for our Structural Insulated Panels.

Faord Panel's NTA code listing report number FRD031609-25

Click Here for Full Code Listing

The data below can be applied according to the rules laid out by the NTA in the SIP Engineering Design Guide. If you have any questions about how to apply the data to your project please contact us. Our technical department has years of experience working with SIPs and adapting the data to the different structural properties of our other types of panels. The Structural data below reflects that assessment of Structural Insulated SIPs with EPS cores by NTA.

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Foard Panel Inc. Standard Submittal Sheets

Structural Panel pdf
Drywall Clad pdf
T&G Clad pdf
Nailbase pdf

Foard Panel Inc. Warranty

Sample Warranty, contact us for project specific version pdf

Click Here to learn more about NTA third party certifications.

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R-Values

One of the greatest benefits of SIP construction is the decreased thermal bridging when compared to conventional stick framed walls. The R-value given on insulation materials is a center of cavity number it tells you how good the insulation is, however in most structures the studs are placed 16″ on center and windows are double framed.

R-Values of Standard SIP Sizes

Panel Thickness EPS NEO XPS PIR
Foam only 1" R-3.8 R-4.5 R-5 R-5.7
4.5" R-15 R-18 R-20 R-22
6.5" R-23 R-27 R-30 R-34
8.25" R-30 R-35 R-38 R-43
10.25" R-37 R-44 R-48 R-55
12.25" R-45 R-53 R-58 R-66
15" R-55 R-65 - -
16" R-59 R-70 - -
17" R-63 R-74 - -
19" R-71 R-83 - -
25" R-93 R-110 - -

Around 18%-35% of the conventional wall doesn’t have any insulation, just wood (or worse, metal studs) as thermal bridging. SIPs in comparison have about 5%-20% thermal bridging mostly around windows and doors. SIPs can give you better performance from thinner wall profiles.

R-Value Comparison Table
Foard Panel SIP vs. Conventional Stick Built

Wall Thickness Fiberglass Cellulose EPS SIP NEO SIP XPS SIP PIR SIP
4.5" Center of Cavity R-11 R-13 R-15 R-17 R-19 R-22
Whole Wall R-9 R-9 R-13 R-15 R-16 R-18
6.5" Center of Cavity R-17 R-20 R-23 R-26 R-29 R-34
Whole Wall R-13 R-14 R-20 R-22 R-24 R-27
8.25" Center of Cavity R-23 R-26 R-30 R-34 R-38 R-43
Whole Wall R-17 R-18 R-25 R-28 R-31 R-35
10.25" Center of Cavity R-29 R-33 R-37 R-43 R-48 R-55
Whole Wall R-21 R-23 R-32 R-36 R-38 R-43
12.25" Center of Cavity R-35 R-40 R-45 R-52 R-58 R-66
Whole Wall R-26 R-28 R-38 R-43 R-46 R-52


Basic Properties of EPS SIP From our NTA Code Listing

Properties Units Weak-Axis Bending Strong-Axis Bending
Allowable Tensile Stress Ft (psi) 245 495
Allowable Compressive Stress Fc (psi) 340 580
Elastic Modulus (Bending) Eb (psi) 738900 658800
Shear Modulus G (psi) 207 405
Allowable Core Shear Stress Fv (psi) 4.5 5.0
Core Compressive Modulus Ec (psi) 360 360
Reference Depth ho (in.) 4.625 4.625
Shear Depth Factor Exponent m 0.084 0.086

 

Section Properties of EPS SIP From NTA Code Listing

Properties Units 4.625" 6.50" 8.25" 10.25" 12.25"
Core Thickness c (in.) 3.75 5.625 7.375 9.375 11.375
Dead Weight Wd (psf) 3.2 3.3 3.5 3.6 3.8
Facing Area Af (in.2/ft) 10.5 10.5 10.5 10.5 10.5
Shear Area Av (in.2/ft) 50.3 72.8 93.8 117.8 141.8
Moment of Inertia I (in.4/ft) 46.0 96.5 160.2 252.7 366.3
Section Modulus S (in.3/ft) 19.9 29.7 38.8 49.3 59.8
Radius of Gyration r (in.) 2.09 3.03 3.91
Centroid-to-Facing Yc (in.) 2.31 3.25 4.13

 

Allowable Transverse Loads(psf) for EPS SIP with Surface Splines from NTA Code Listing

Panel Length (ft) 8'WAB 8' 10' 12' 14' 16' 18' 20'
Thickness Deflection Limits
4.5" L/180 50.8 68.8 45.1 30.8 21.7
L/240 40.9 51.6 33.8 23.1 16.3
L/360 27.3 34.4 22.5 15.4
6.5" L/180 73.8 80.6 62.0 50.4 39.6 29.4 22.4
L/240 64.7 80.6 57.9 40.9 29.7 22.1 16.8
L/360 43.1 56.6 38.6 27.3 19.8 14.7
8.25" L/180 81.4 88.5 67.4 54.4 45.6 39.3 34.1 26.7
L/240 81.4 88.5 67.4 54.4 43.9 33.2 25.6 20.0
L/360 58.3 78.4 54.8 39.6 29.3 22.1 17.1 13.4
10.25" L/180 89.9 97.3 73.1 58.6 48.8 41.9 36.7 32.6
L/240 89.9 97.3 73.1 58.6 48.8 41.9 36.7 29.2
L/360 75.9 97.3 73.1 54.6 41.1 31.5 24.6 19.5
12.25" L/180 98.6 106.4 78.8 62.5 51.9 44.3 38.7 34.3
L/240 98.6 106.4 78.8 62.5 51.9 44.3 38.7 34.3
L/360 93.6 106.4 78.8 62.5 51.9 41.7 32.9 26.3

 

Allowable Axial Loads(plf) for EPS SIP from NTA Code Listing

Lateral Bracing(ft) 8'WAB 8' 10' 12' 14' 16' 18' 20'
4.5" 2320 3630 3260 2810
6.5" 2470 4070 3890 3660 3390 3090 2790
8.25" 2530 4240 4130 4000 3830 3640 3430 3190