Installation Guide

Page

Unirac Code-Compliant Installation Manual

SunFrame

1411 Broadway Boulevard NE

Albuquerque NM 87102-1545 USA

Miles per hour

(meters per second)

Figure 1. Basic Wind Speeds. Adapted and

applicable to ASCE 7-05. Values are nominal

design 3-second gust wind speeds at 33 feet

above ground for Exposure Category C.

10 3 3 3 3 3 4 4 4 4 4 4 4 5 6 7 8 12 16 20

15 3 3 3 3 3 4 5 6 6 6 6 6 6 6 7 8 12 16 20

20 3 3 3 3 3 4 5 6 7 8 8 8 8 8 8 8 12 16 20

25 3 3 3 3 3 4 5 6 7 8 9 10 10 10 10 10 12 16 20

30 3 3 3 3 3 4 5 6 7 8 9 10 12 12 12 12 12 16 20

35 3 3 3 3 3 4 5 6 7 8 9 10 12.5 14 14 14 14 16 20

40 3 3 3 3 3 4 5 6 7 8 9 10 12.5 15 16 16 16 16 20

45 3 3 3 3 3 4 5 6 7 8 9 10 12.5 15 17.5 18 18 18 20

50 3 3 3 3 3 4 5 6 7 8 9 10 12.5 15 17.5 20 20 20 20

60 3 3 3 3 3 4 5 6 7 8 9 10 12.5 15 17.5 20 24 24 24

Roof Least Horizontal Dimension (ft)

Height (ft)

10 15 20 25 30 40 50 60 70 80 90 100 125 150 175 200 300 400 500

Table 1. Determine Roof/Wall Zone, length (a) according to building width and height

a = 10 percent of the least horizontal dimension or 0.4h, whichever is smaller, but not less than either 4% of the least horizontal

dimension or 3 ft of the building.

Source: ASCE/SEI 7-05, Minimum Design Loads for Buildings and Other Structures, Chapter 6, Figure 6-3, p. 41.

Step 3: Determine Roof/Wall Zone:

The Design Wind Load will vary based on where the

installation is located on a roof. Arrays may be located in more

than one roof zone.

Using Table 1, determine the Roof Zone Setback Length, a (ft),

according to the width and height of the building on which

you are installing the pv system.