HomeMy WebLinkAboutRoofing Application Standards-� ROOFING APPLICATION STANDARD (RAS) No.128
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STANDARD PROCEDURE FOR DETERMINING APPLICABLE WIND DESIGN
• PRESSURES FOR LOW SLOPE ROOF
1. Scope
1.1 This roofing application standard has
been developed to provide a responsive
method of complying with the require-
ments of Chapters 15 & 16 (High -Veloc-
ity Hurricane Zones) of the Florida
Building Code, Building. Compliance
with the requirements and procedures
herein specified, where the pressures
(Pass) have been determined based on Ta-
ble 1 or 2, of this standard, as applicable,
do not require additional signed and
sealed engineering design calculations.
All other calculations must be prepared,
signed and sealed by a professional engi-
neer or registered architect.
2. Definitions
2.1 For definitions of terms used in this appli-
cation standard, refer to ASTM D 1079
and the Florida Building Code, Building.
3. Applicability
3.1 This application standard applies to:
a. exposure C and D category build-
ings; and
b. building heights of Jess than or
equal to 40 feet; and
C. roof incline (pitch) is not greater
than V, in.:12 in.
d. risk category II buildings.
3.2 Using Table 1 or 2 below, as applicable,
determine the minimum design pressure
for each respective roof area, which corre-
sponds to the applicable roof height
range.
3.3 Referencing the selected Roof Assembly
Product Approval, check that the listed
maximum allowable design pressure for
the particular approved system meets or
exceeds those listed in Table 1 or Table 2
above, as applicable.
:TABLE 1 — RIS�K CCATEGORYkII�EXPOSWRE CA EGORY` _
EIL&rPdl
MINIMUM DESIGN IND UPL�FTPRESSURES IN PSF-FOR ].)], PERIMETER fPasd(2)]
AND CORNER [Pesd(3)] AREAS O ROOFq F„OR EX S E C"!BUILDINGS
Roof mean
P.d(1) (Field)
P.d(2) (Perimeter)
Pnd(3) (Corners)
height (below)
•20", x.�
-
_ -428' _ - - -
7VT- —�
'�-71.7.. —
-108:0�
25
-44.8
-75.1
-113.0
30
-46.4
-77.8
-117.2
35
-48.1
-80.6
-121.3
40
-49.4
-82.9
-124.7
t Calculated in accordance with ASCE 7.
2 P.d = 0.6Putt
FLORIDA BUILDING CODE — TEST PROTOCOLS FOR HVHZ, 5th EDITION (2014)
(RAS)128.1