§ 3129.07 Wind Loads on Signs, Tank Towers and Chimneys

   BOCA Section 915.0 entitled “Wind Loads on Signs, Tank Towers and Chimneys” is hereby amended to read as follows:

   Section 915.0 Wind Loads on Signs, Tank Towers and Chimneys.

   (a)   Signs in which the projected area exposed to wind consists of seventy percent (70%) or more of the gross area as determined by the over-all dimensions shall be classed as solid signs; those in which the projected exposed area is derived from open letters, figures, strips, and structural framing members, the aggregate total area of which is less than seventy percent (70%) of the gross area determined by the over-all dimensions, shall be classed as open signs.

   (b)   Signs, other than ground signs fifty (50) feet or less in height, shall be designed and constructed to withstand the horizontal pressures given in the following table applied to the net projected exposed area of all parts of the signs including structural framing, allowing for wind from any direction:

Table WS
Design Wind Pressures for Signs Other than Ground Signs 50 Feet or less in Height

Height from Ground to Top of Sign (Ft.)	Wind Pressure (Lbs. per Sq. Ft.)
	Solid Signs (All Types)	Open Signs (All Types)
Less than 50	25	35
50 to 99	30	42
100 to 199	35	49
200 to 299	38	53
300 to 399	40	56
400 to 499	42	58
500 to 599	43	60
600 to 799	44	61
800 to 999	45	63
1000 to 1199	46	65
1200 to 1399	48	67
1400 to 1599	49	68
1600 and over	50	70

 

   (c)   Solid Ground Signs. Solid ground signs less than fifty (50) feet in height shall be designed and constructed to withstand a wind pressure of not less than twenty (20) pounds per square foot.

   (d)   Open Ground Signs. Open ground signs less than fifty (50) feet in height shall be designed and constructed to withstand a wind pressure of not less than thirty (30) pounds per square foot.