Page
7
SunFrame
Unirac Code-Compliant Installation Manual
R
1411 Broadway Boulevard NE
Albuquerque NM 87102-1545 USA
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Table 3. p
net30
(psf)
Roof Overhang
Source: ASCE/SEI 7-05, Minimum Design Loads for Buildings and Other Structures, Chapter 6, p. 44.
Roof 27 to 45 degr
ees
Roof 7 to 27 degr
ees
Roof 0 to 7 degr
ees
Basic Wind Speed, V (mph)
Effective
Wind Area
(sf)
Zone
Step 5: Determine the Topographic Factor,
K
zt
:
For the purposes of this code compliance document, the
Topographic Factor
,
K
zt
, is taken as equal to one (1), meaning,
the installation is on level ground (less than 10% slope) . If the
installation is not on level ground, please consult ASCE 7-05,
Section 6 .5 .7 and the local building authority to determine the
Topographic Factor
.
Step 6: Determine
Exposure Category (B, C, D):
Determine the
Exposure Category
by using the following
definitions for Surface Roughness Categories .
The
ASCE/SEI 7-05*
defines wind exposure categories as
follows:
S
urface
r
oughneSS
b
is urban and suburban areas,
wooded areas, or other terrain with numerous closely
spaced obstructions having the size of single family
dwellings .
S
urface
r
oughneSS
c
has open terrain with scat-
tered obstructions having heights generally less than
30 feet . This category includes flat open country,
grasslands, and all water surfaces in hurricane prone
regions .
S
urface
r
oughneSS
d
has flat, unobstructed areas
and water surfaces outside hurricane prone regions .
This category includes smooth mud flats, salt flats, and
unbroken ice .
Also see ASCE 7-05 pages 287-291 for further explanation and
explanatory photographs, and confirm your selection with the
local building authority .
