HomeMy WebLinkAboutAPPROVED A-1.21FLAT ROOF DRAINAGE CALCULATIONS
HIGH FLAT ROOF AT ENTRY STRUCTURE
HORIZONATLLY PROJECTED FLAT ROOF AREA (square feet)
240.25 SQ. FT.
COMBINED ROOF AREA (square feet)
240.25 SQ. FT.
COMBINED ROOF AREA (square feet)
240.25 SQ. FT.
Rainfall Rate (inches per hour)
4.5 INCHES
VOLUME OF ACCUMULATED RAINFALL PER HOUR:
90.1 CU. FT. = 674 GAL. PER HR
TOTAL GALLONS PER MINUTE
11.25 GPM
NUMBER OF 2!/," X 2-y2" MIN. DRAIN LEADERS PROVIDED: (1)
11.25 GPM / 1 = 11.25 GPM PER LEADER
(2 %2" X 2 %2" VERTICAL LEADERS = 54 GPM CAPACITY)
LOW FLAT ROOF AT MAIN STRUCTURE
HORIZONATLLY PROJECTED FLAT ROOF AREA (square feet)
2,379 SQ. FT.
%2 AREA OF CONTRIBUTING VERTICAL PARAPET (square feet)
177.5 SQ. FT.
COMBINED ROOF AREA (square feet)
2,556.5 SQ. FT.
COMBINED ROOF AREA (square feet)
2,556.5 SQ. FT.
Rainfall Rate (inches per hour)
4.5 INCHES
VOLUME OF ACCUMULATED RAINFALL PER HOUR:
958.7 CU. FT. = 7,172 GAL. PER HR
VOLUME OF ACCUMULATED RAINFALL PER MIN:
120 GPM
CONTRIBUTING HIGH ROOF AREA (GPM)
11.25 GPM
TOTAL GALLONS PER MINUTE
131.25 GPM
NUMBER OF 2x4 MIN. DRAIN LEADERS PROVIDED: (4) 131.25
GPM / 4 = 33 GPM PER LEADER
(2x4 VERTICAL LEADERS = 92 GPM CAPACITY)
ROOFING SPECIFICATIONS & NOTES
PRE -FABRICATED MECHANICAL CURB SYSTEM (OPTIONAL COMPONENT) :
GUTTER & RAIN LEADER SYSTEMS:
FIRESTONE INSULATED METAL CURB SYSTEM - ATTACHMENT PER MANUFACTURERS & NOA
DECORATIVE GUTTER SYSTEMS BY OWNER. RAIN LEADERS TO DISCHARGE TO CONCRETE SPLASH
REQUIREMENTS. (OR APPROVED EQUAL)
BLOCKS ON EXISTING CONCRETE PAVEMENT AND SHEET FLOW TO EXISTING STORMDRAINAGE SYSTEM
ROOF PENETRATION FLASHING:
TPO ROOF ASSEMBLY - BY GAF:
FIRESTONE TPO UltraPly CUSTOM ACCESSORIES (OR APPROVED EQUAL)
EverGuard TPO Single Ply Roofing Systems over Wood Decks: "NOA - 20-0518.02"
CAP FLASHING & EAVE DRIP EDGE FLASHING
CONTINUOUS PRE -FINISHED GALVALUME CAP FLASHING, WALL COUNTER FLASHING AND EAVE DRIP
1�
EDGE FLASHING - PRE -FINISHED TO MATCH METAL ROOF COLOR MANUFACTURER TO BE
DETERMINED
"A&
ROOFING LEGEND
SYMBOL
DESCRIPTION
TPO SINGLE PLY MEMBRANE ROOFING SYSTEM:
FLAT ROOFING SYSTEMS TO BE: "GAF EVERGUARD" TPO SINGLE PLY ROOFING
SYSTEM MECHANICALLY FASTENED ROOFING SYSTEM (OR APPROVED EQUAL)
OVER NEW SPECIFIED RIGID INSULATION - SEE STRUCTURAL DRAWINGS FOR DECK
ATTACHMENT. FASTENING PER MANUFACTURERS NOA REQUIREMENTS.
D PARAPET WALL
'O EXISTING
NALL BELOW
Brent
Wood
Digitally signed by
Brent Wood
DN: cn=Brent Wood,
o=Brent A. Wood
Architecture, LLC, ou,
email=brent@bawoo
darch.com, c=US
Date: 2021.03.29
16:50:50-04'00'
ROOF PLAN
SCALE: 1/4" = V-0" A-1.21
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