Structural Loads are stresses to structure from external or internal forces. Also see Lexan Tech Data
 
• Dead loads are gravity loads that are constant throughout the structure's life. These include equipment such as fans, heaters and plants suspended from the frame.
• Live loads are temporary, such as snow loads and wind loads. 
• Snow loads determined by factors influencing snow & ice accumulation on the structure. Snow loads vary considerably by geographic location. Ask your local bldg. dept. for snow load in your area. ( 12 inches of light, fluffy snow or 2 to 4 inches of heavy, wet snow = about 5 lbs per sq. ft.)
• Wind loads can come from any direction but usually hit side walls at a perpendicular angle.
 
Figures are in lbs. per sq. ft.
 

Wind Speed
85 mph
90 mph
100 mph
120 mph
130 mph
140 mph
150 mph
160 mph

 
18
20
25
36
43
48
56
85
 
Wind speeds up to 90 mph: Screws with 3/4" sealing washers are to be set at corners of glazed areas and every 1 ft. on-center. Cap and Corner receive screws at ends of each Trim piece and every 1 ft. on center. In winds of 110 mph and over decrease distance between screws to every 10". In winds of 150 mph and over decrease distance between screws to every 8". For placement of screws in body sheet see Polycarb. Position & Attach.
 
Base & Cap: Quantity of screws to attach Base to frame and Cap to Base every 1 ft. are provided with order. For extreme high wind areas Email, prior to placing order, and indicate maximum expected wind speed so we can calculate screws required for your application.
 
• Combination loads are common. For example, a snowstorm may include high winds.
 
• Blocking, Purlin or Girt placement for wind and combination loads: If bldg. dept. says design for a 45 lb. snow load & 90 mph wind, snow will effect the roof with a 45 lb. load and wind will effect roof with 20 lb. load. To safely design your roof framing, take the 45 lb. snow load, add 20 lbs. for effect the wind may have on the roof. Design for a 65 lb. load.
 
 
Important Note: Above wind load figures provided by SABIC Innovative Plastics, the Lexan manufacturer.