Design Criteria

The City of Arvada design criteria is as follows

• Frost Depth = 36 inches
• Roof Snow Load = 30 PSF
• Ground Snow Load = 25 PSF
• Rainfall (for roof drain sizing) = 2.4" per hour
• Seismic Design Catagory: B
• Winter Design Temp: 1 degree F.   (-17 degrees C)
• Summer Design Temp: 95 degrees F ( 20.77 degrees C)
• Termite: Slight to Moderate
• Flood Hazzards: NFIP-November 20 1972/FIRM-June 17 2003
• Air Freezing Index: 500-1000
• Mean Annual Temp: 50.5
• Decay: None to Slight
• Weathering - Severe
• Moderate Hail Exposure 1 layer roofing for Asphalt.
• Ice Barrier required

Wind Speed:

• East of Sheridan Blvd: 90 Mph/Exposure B
• West Sheridan Blvd. to Wadsworth Blvd: 100 Mph/Exposure B
• West Wadsworth Blvd. to Indiana St: 110 Mph/Exposure B
• West of Indiana St to Highway 93: 110 Mph/Exposure C 
• West of Highway 93 120 Mph/Exposure C

Energy

• Climate Zone 5
• Interior Design 72 Degrees F(22 C) maximum heating
• Interior Design 75 Degrees F(25 C) minimum cooling

Insulation

• Roof    

                  Attic: R-30

                  Insulation above deck: R-20

•  Walls

                  Wood: R-13

                  Mass: R-7.6

                  Metal Building: R-13 + R-13

                  Metal Frame: R-13 + R-3.8 Cont. Ins.