PorterSIPs Structural Insulated Panels

Transverse Roof & Floor Panel Load Chart

Allowable Uniform Transverse Loads⁴

Panel Length (ft)	4-5/8-inch Thick SIP			6-1/2-inch Thick SIP
	Deflection Limit²			Deflection Limit²
	L/180	L/240	L/360	L/180	L/240	L/360
8 WAB³	50.8	44.6	29.7	75.8	71.0	47.3
8	76.4	57.3	38.2	104.8	94.0	62.7
10	50.4	37.8	25.2	80.6	64.5	43.0
12	34.6	26.0	17.3	61.0	45.8	30.5
14	24.6	18.4	12.3	44.5	33.4	22.3
16	--	--	--	33.2	24.9	16.6
18	--	--	--	25.3	19.0	12.7

Allowable Uniform Transverse Loads (continued)⁴

Panel Length (ft)	8-1/4-inch Thick SIP			10-1/4-inch Thick SIP			12-1/4-inch Thick SIP
	Deflection Limit²			Deflection Limit²			Deflection Limit²
	L/180	L/240	L/360	L/180	L/240	L/360	L/180	L/240	L/360
8 WAB³	99.1	96.2	64.1	125.9	125.4	83.6	139.6	139.6	103.2
8	115.4	115.4	86.5	127.4	127.4	114.3	139.6	139.6	139.6
10	87.9	87.9	60.8	95.7	95.7	82.0	103.4	103.4	103.4
12	70.9	66.2	44.1	76.6	76.6	60.6	82.1	82.1	77.8
14	59.5	49.2	32.8	63.9	63.9	45.9	68.1	68.1	59.7
16	49.8	37.4	24.9	54.8	53.0	35.3	58.1	58.1	46.6
18	38.5	28.9	19.2	48.0	41.5	27.7	50.7	50.7	36.9
20	30.2	22.7	15.1	40.7	33.0	22.0	45.0	44.3	29.6

¹ Table values assume a simply supported panel with 1.5-inches of continuous bearing on facing at supports (C_v = 1.0) with splines at bearing locations. Values do not include the dead weight of the panel. C_v=0.4 Shall be used where no bearing is provided.

² Deflection limit shall be selected by building designer based on the serviceability requirements of the structure and the requirements of adopted building code. Deflection values based on loads of short duration only and do not consider effects of creep.

³ Tabulated values are based on the strong-axis of the facing material oriented parallel to the span direction. WAB indicates weak-axis bending of the facing material (i.e. the facing material weak-axis is parallel to the span direction).

⁴Permanent loads, such as dead load, shall not exceed 0.50 times the tabulated load.