HomeMy WebLinkAboutA3.1 - Roof Plan V1aWRIDI 9-
APPROVED
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ROOF PLAN
ATTIC VENTILATION CALCS
A. VENTED ATTICS: PER IRC SEC. R806.2.1 THE MINIMUM NET VENT. AREA SHALL BE 1/150 OF
THE AREA OF THE VENTED SPACE.
EXCEPTION: THE MIN NEF FREE VENT AREA SHALL BE 1 /300 OF THE AREA OF THE VENTED
SPACE PROVIDED BOTH OF THE FOLLOWING ARE MET:
1. IN CLIMATE ZONES 14 & 16, A CLASS 1 OR 11 VAPOR RETARDER IS INSTALLED ON THE
WARN -IN -WINTER SIDE OF THE CEILING.
2. NOT LESS THAN 40% AND NOT MORE THAN 50% OF THE REQUIRED VENTILATING AREA IS
PROVIDED BY VENTILATORS LOCATED IN THE UPPER PORTION OF THE ATTIC OR RAFTER
SPACE. UPPER VENTILATORS SHALL BE LOCATED NOT MORE THAN 3 FT. BELOW THE RIDGE
OR HIGHEST POINT OF THE SPACE, MEASURED VERTICALLY. THE BALANCE OF THE
REQUIRED VENTILATION SHALL BE LOCATED IN THE BOTTOM ONE-THIRD OF THE ATTIC
SPACE. WHERE THE LOCATION OF WALL OR ROOF FRAMING MEMBERS CONFLICTS WITH
THE INSTALLATION OF UPPER VENTILATORS, INSTALLATION MORE THAN 3 FT. BELOW THE
RIDGE OF HIGHEST POINT OF THE SPACE SHALL BE PERMITTED.
SEE ELEVATION SHEETS FOR ATTIC AREA SQ.FT.
FLAT TILE ROOFS SHALL BE VENTILATED ACCORDING TO THE FOLLOWING:
ATTIC AREA
VENT RATIO 1 /300
(S.F.)
(FLAT TILE)
0 - 406
(2) VENTS - O'HAGIN STANDARD
(2 x 97.50 S.I. / 144 S.I. x 300 S.F.)
407 812
(4)VENTS- O'HAGIN STANDARD
(4 x 97.50 S.I. / 144 S.I. x 300 S.F.)
813 1218
(6)VENTS- O'HAGIN STANDARD
(6 x 97.50 S.I. / 144 S.I. x 300 S.F.)
1219 - 1625
(8) VENTS - O'HAGIN STANDARD
(8 x 97.50 S.I. / 144 S.I. x 300 S.F.)
1626-2031
(10)VENTS- O'HAGIN STANDARD
(10 x 97.50 S.I. / 144 S.I. x 300 S.F.)
ATTIC AREA
VENT RATIO 1/150
(S.F.)
(FLAT TILE)
0 - 203
(2) VENTS - O'HAGIN STANDARD
(2 x 97.50 S.I. / 144 S.I. x 150 S.F.)
204 - 406
(4) VENTS - O'HAGIN STANDARD
(4 x 97.50 S.I. / 144 S.I. x 150 S.F.)
407 - 609
(6) VENTS - O'HAGIN STANDARD
(6 x 97.50 S.I. / 144 S.I. x 150 S.F.)
NOTE: ALL VENTILATION CALCULATIONS ARE BASED ON VENTS WITH 97.50 SQ. IN. NET
FREE VENT AREA AS PROVIDED BY O'HAGIN PRODUCTS ('S" FILE)
NO ROOF PENETRATIONS IN SHADED AREA
PROVIDE 5/8" TYPE 'X' GYPSUM TO UNDER ( j
SIDE OF PLYWOOD ROOF SHEATHING. Ir/
-ALT. PROVIDE FIRE RATED PLYWOOD
ROOF SHEATING.
- SEE DETAIL SHEET FDA
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7/19/22
Revision Date:
9/15/2022
LICENSED
ARCHITECT
AR986950
KEVIN L. CROOK
STATE OFIDAHO
Project #:
22068
Sheet Name:
Roof Plan
Sheet #:
A3.1
0
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SCALE: 1/4" = 1'-0"
Filename: A3.l.tlwg