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EXCERPTS OF THE 2012 International Residential Code: Part 111 CHAPTER S � 9 C �� r'f ��IVE
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<br /> SECTION RS01 CHAPTER 9
<br /> C'iENERAL ROOF ASSEMBLIES Preciszon � Grace
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<br /> RSO I. I APPLICATION. �508 Audu6on Park Dr SE
<br /> THE PROVISIONS OF THIS CHAPTER SHALL CONTROL THE DESIGN AND CONSTRUCTION OF THE R903. I GENERAL Sammamish, WA 98075
<br /> ROOF-CEILING SYSTEM FOR ALL BUILDINGS. ROOF DECKS SHALL BE COVERED WITH APPROVED ROOF COVERINGS SECIIRED TO THE
<br /> BUILDING OR STRLICTURE IN ACCORDANCE WITH THE PROVISIONS OF THIS CHAPTER. ROOF
<br /> RSO I.2 REQLIIREMENTS. ASSEMBLIES SHALL BE DESIGNED AND INSTALLED IN ACCORDANCE WITH THIS CODE AND 206-619-3995
<br /> ROOF AND CEILING CONSTRUCTION SHALL BE CAPABLE OF ACCOMMODATING ALL LOADS THE APPROVED MANLIFACTURER'S INSTALLATION INSTRIICTIONS SIICH THAT THE ROOF 2eclectic7@gmail.com
<br /> IMPOSED ACCORDING TO SECTION R301 AND OF TRANSMITTING THE RESULTING LOADS TO ASSEMBIY SHALL SERVE TO PROTECT THE BUILDING OR STRUCTIIRE. Skype:eclecacseven �
<br /> THE SLIPPORTING STRIICTIIRAL ELEMENTS.
<br /> RS01.3 ROOF DRAINAGE.
<br /> IN AREAS WHERE EXPANSIVE OR COLLAPSIBLE SOILS ARE KNOWN 70 EXIST,ALI. DWELLINGS �
<br /> SHALL HAVE A CONTROLLED METHOD OF WATER DISPOSAL FROM ROOFS THAT WILL COLLECT R903.2 FLASHING. �
<br /> AND DISCHARGE ROOF DRAINAGE TO THE GROUND SURFACE AT LEAST 5 FEET(15�4 MM) FLASHINGS SHALL BE INSTALLED IN A MANNER THAT PREVENTS MOISTURE FROM ENTERING O
<br /> FROM FOIiNDATION WALLS OR TO AN APPROVED DRAINAGE SYSTEM. THE WALL AND ROOF THROUGH JOINTS IN COPINGS, THROLIGH MOISTLIRE PERMEABLE v
<br /> MATERIALS AND AT INTERSECTIONS WITH PARAPET WALLS AND OTHER PENETRATIONS �
<br /> THROUGH THE ROOF PLANE. �
<br /> CHAPTER 8 � '"
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<br /> ROOF-CEILING CONSTRUCTION R903.�. I LOCATIONS. �
<br /> FLASHINGS SHALL BE INSTALLED AT WALL AND ROOF INTERSECTIONS, WHEREVER �
<br /> THERE IS A CHANGE IN ROOF SLOPE OR DIRECTION AND AROUND ROOF .
<br /> RSOE. I VENTILATION REQUIRED. OPENINGS. WHERE FLASHING IS OF METAL, THE METAL SHALL BE CORROSION �i
<br /> ENCLOSED ATfICS AND ENCLOSED RAFTER SPACES FORMED WHERE CEILINGS ARE APPLIED RESIS7ANT WITH A THICKNESS OF NOT LESS THAN 0.019 INCH(0.5 MM) (NO. 26 � �
<br /> DIRECTLY TO THE UNDERSIDE OF ROOF RAFTERS SHALL HAVE CROSS VENTILATION FOR GALVANIZED SHEE�. � � _
<br /> EACH SEPARATE SPACE BY VENTILATING OPENINGS PROTECTED AGAlNST THE ENTRANCE OF � �
<br /> RAIN OR SNOW. VENTILATING OPENINGS SHALL BE PROVIDED WITH CORROSION-RESISTANT R903.3 COPING. � � �
<br /> WIRE MESH, WITH I/8 INCH(3.2 MM) MINIMUM TO /4 INCH(6 MM) MAXIMUM OPENINGS � _
<br /> PARAPET WALLS SHALL BE PROPERLY COPED WITH NONCOMBUSTIBLE, WEATHERPROOF �'V �
<br /> MATERIALS OF A WIDTH NO LESS THAN THE THICKNESS OF THE PARAPET WALL. � � Q �
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<br /> R806.2 MINIMUM AREA. � �
<br /> THE TOTAL NET FREE VENTILATIN6 AREA SHALL NOT BE LESS THAN I TO I 50 OF THE AREA R903.4 ROOF DRAINAGE.
<br /> OF THE SPACE VENTILATED EXCEPT THAT THE TOTAL AREA IS PERMITTED TO BE REDUCED IINLESS ROOFS ARE SLOPED TO DRAfN OVER ROOF EDGES, ROOF DRAINS SHALL BE •O
<br /> TO I TO 300, PROVIDED AT LEAST 50 PERCENT AND NOT MORE THAN SO PERCENT OF THE INSTALLED AT EACH LOW POINT OF THE ROOF. WHERE REQUIRED FOR ROOF DRAINAGE, � � M
<br /> REQL11RED VENTILATING AREA IS PROVIDED BY VENTILATORS LOCATED IN THE UPPER SCUPPERS SHALL BE PLACED LEVEL WITH THE ROOF SURFACE IN A WALL OR PAIZAPET. THE � � k
<br /> PORTION OF THE SPACE TO BE VENTILATED AT LEAST 3 FEET(914 MM)ABOVE EAVE OR SCLIPPER SHALL BE LOCATED AS DETERMINED BY THE ROOF SLOPE AND CONTRIBLITING � � �
<br /> CORNICE VENTS WITH THE BALANCE OF THE REQLIIRED VENTILATION PROVIDED BY EAVE ROOF AREA. � rv
<br /> OR CORNICE VENTS.AS AN ALTERNATIVE, THE NET FREE CROSS-VENTILATION AREA MAY BE � �
<br /> REDLICED TO I TO 300 WHEN A VAPOR BARRIER HAVING A TRANSMISSION RATF NOT � -�
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<br /> EXCEFDING I PERM (57.4 MG/S • M2PA) IS INSTALLED ON THE WARM SIDE OF THE CEILING. R9O3.4. I OVERFLOW DRAINS AND SCUPPERS. (�l
<br /> WHERE ROOF DRAINS ARE REQUIRED, OVERFLOW DRAINS HAVING THE SAME SIZE �� ,
<br /> AS 7HE ROOF DR,41NS SHALL BE INSTALLED WITH THE INLET FLOW LINE LOCATED 2 �
<br /> INCHES(5 I MM)ABOVE THE LOW POINT OF THE ROOF, OR OVERFLOW SCLIPPERS O
<br /> HAVING THREE TIMES THE SIZE OF THE ROOF DRAINS AND HAVING A MINIMLIM
<br /> R806.3 VENT CLEARANCE. OPENING HEIGHT OF 4 INCHES(102 MM)SHALL BE INSTALLED IN THE ADJACENT �
<br /> WHERE EAVE OR CORNICE VENTS ARE INSTALLED, INSULATION SHALL NOT BLOCK THE FREE PARAPET WALLS WITH THE INLET FLOW LOCATED� INCHES(51 MM)ABOVE THE �
<br /> FLOW OF AIR.A MINIMLIM OF A 1-INCH (25 MM)SPACE SHALL BE PROVIDED BETWEEN THE LOW POINT OF THE ROOF SERVED. THE lNSTALLATION AND SIZING OF OVERFLOW �
<br /> INSLILATION AND THE ROOF SHEATHING AND AT THE LOCATION OF THE VENT. DRAINS, LEADERS AND CONDUCTORS SHALL COMPLY WITH 7HE INTERNATIONAL
<br /> PLUMBING CODE. �
<br /> OVERFLOW DRAINS SHALL DISCHARGE TO AN APPROVED LOCATION AND SHALL �
<br /> NOT BE CONNECTED TO ROOF DRAIN LINES. w
<br /> R807. I ATTIC ACCESS. '
<br /> IN BLIILDINGS WITH COMBUSTIBLE CE►L►NG OR ROOF CONSTRLICTION, AN ATTIC ACCESS Project Site:
<br /> OPENING SHALL BE PROVIDED TO ATTIC AREAS THAT EXCEED 30 SQUARE FEET(2.8 M2) 45 I S Seahurst Ave.
<br /> AND HAVE A VERTICAL HEIGHT OF 30 INCHES(762 MM) OR GREATER. THE ROUGH-FRAMED Everett, WA
<br /> OPENING SHAL� NOT BE LESS THAN 22 INCHES BY 301NCHES(559 MM BY 762 MM)AND
<br /> SHALL BE LOCATED IN A HALLWAY OR OTHER READILY ACCESSIBLE LOCATION. A 30-INCH Building Department:
<br /> (76� MM)MINIMIIM UNOBSTRUCTED HEADROOM 1N THE ATTIC SPACE SHALL BE PROVIDED City of Everett
<br /> AT SOME POINT ABOVE THE ACCESS OPENING. SEE SECTION M 1305.I.3 FOR ACCESS
<br /> REQUIREMENTS WHERE MECHANICAL EQLIIPMENT IS LOCATED IN ATTICS. Building Code:
<br /> I.R.C. 201�
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<br /> R808. I COMBUSTIBLE INSULATION.
<br /> LL BE E A TED A I I � E
<br /> COMBUSTIBLE INSLILATION SHA S P RA M N MIIM OF 3 INCHES 76 MM FROM
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<br /> RECESSED LIGHTING FIXTURES, FAN MOTORS AND OTHER HEAT-PRODl1CING DEVICES.
<br /> EXCEPTION: WHEN HEAT-PRODUCING DEVICES ARE LISTED FOR LESSER CLEARANCES, ��;� 5�>
<br /> COMBl1STiBLE INSIILATION COMPLYING WITH THE LISTIN6 REQLI(REMENTS SHALL BE S
<br /> ,�� � � � •� SEPARATED IN ACCORDANCE WITH THE CONDITIONS STIPUI.ATED IN THE LISTING.
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<br /> � RECESSED LIGHTING FIXTIiRES INSTALLED IN 7HE BLIILDIN6 THERMAL ENVELOPE SHAL�MEET Pro'ect Com ass
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<br /> ���`` � ' � � ` � R�806.4 COl'V bl�"�ONED ATT1E���SSEMBLIES. � �� aranjo
<br /> IINVENTED CONDITIONED ATTIC ASSEMBLIES(SPACES BETWEEN THE CEILING JOISTS OF THE January 5, �016
<br /> TOP STORY AND 7HE ROOF RAFTERS)ARE PERMITTED LINDER THE FOLLOWING CONDITIONS:
<br /> 1. NO INTERIOR VAPOR RETARDERS ARE INSTALLED ON THE CEILING SIDE(ATTIC Drafter: Vernon
<br /> FLOOR OF THE UNVEN7ED ATTIC ASSEMBLY.
<br /> June I5, 2016
<br /> )
<br /> ', 2. AN AIR-IMPERMEABLE WSULATION IS APPLIED IN DIRECT CONTACT TO THE Design Issued
<br /> UNDERSIDE/INTERIOR OF THE STRUCTIiRAL ROOF DECK. "AIR-IMPERMEABLE"SHALL BE July 30, 2015
<br /> DEFINED BYASTM E�83.
<br /> EXCEPTION: IN ZONES�B AND 3B, INSULATION IS NOT REQUIRED TO BE AIR IMPERMEABLE. Bid Release
<br /> 3. IN THE WARM HUMID LOCATIONS AS DEFINED IN SECTION N I 101.2.I: July 3 I, 20I 5
<br /> 3.I. FOR ASPHALT ROOFING SHINGLES:A I-PERM 5.7 ' I 0-f I KG/S x M2 x PA OR
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<br /> LESS VAPOR RETARDER DETERMINED USING PROCEDURE B OF ASTM E 96 IS PIACED TO
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<br /> �' THE EXTERIOR OF THE STRUCTIiRAL ROOF DECK; THAT IS, JL1ST ABOVE 7HE ROOF
<br /> STRL1GTl1RAL SHEATHING.
<br /> 3.2. FOR WOOD SHINGLES AND SHAKES:A MINIMLIM CONTINUOLIS %-INCH(6 MM) Revision - I
<br /> VENTED AIR SPACE SEPARATES THE SHIN6LES/SHAKES AND THE ROOFIN6 FELT PLACED OVER
<br /> THE STRLICTLIRAL SHEATHING.
<br /> 4. IN ZONES 3 THROUGH 8 AS DEFINED IN SECTION N I 101.�, SLIFFICIENT Project Number
<br /> INSU(.ATION IS INSTA�LED TD MAINTAIN THE MONTHLYAVERAGE TEMPERATLIRE OF THE
<br /> CONDENSING SURFACE ABOVE 45°F(7°C). THE CONDENS►NG SURFACE IS DEFINED AS EITHER 1 1 51 5
<br /> THE STRIiCTLIRAL ROOF DECK OR THE INTERIOR SLIRFACE OF AN AIR-IMPERMEABI.E
<br /> WSUCATION APPLIED IN DIRECT CONTACT WITH THE UNDERSIDE/INTERIOR OF THE All R;ghrs Reser�ed. .
<br /> All contents within this sheet is
<br /> STRUCTIIRAL ROOF DECK. "A1R-IMPERMEABLE"IS QUANTITATIVELY DEFINED BY ASTM E 283. rhe sole property o£Creauve
<br /> FOR CALCULATION PLIRPOSES,AN WTERIOR TEMPERATLIRE OF 68°F(20°C) IS ASSUMED. THE Com£ort.Reproduction by any
<br /> EXTERIOR TEMPERATLIRE IS ASSLIMED TO BE THE MONTHLY AVERAGE OUTSIDE means eirher in whole or in parr
<br /> ' ! reyuires written permission by
<br /> i TEMPERATLIRE. Creau�e Comfort.
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