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IF THIS PLAN IS NOT QN 22x34 PAPER, IT HAS BEEN SCALED ACCORDINGLY
<br /> Code References: �.
<br /> ey �
<br /> R802.10 Wood Trusses: � � � ��,°N' � , •
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<br /> wa LL, o� u,
<br /> R802.20.2 Design; � G] a Q Q �
<br /> Waod trusses s hall be d esi gned in accordance with a c c e p t e d e n gi neerin g prac tice,The desi gn a n d � a.S o y � X ' �
<br /> rnanufactur�of ineta�-plate-connected wood trusses shail comply with ANSI/TPI 1.The truss design � � � m� '-'-
<br /> drawings shall be prepared by a registe�ed professional where required by the statutes of the � b o � �
<br /> iurisdiction in which the project is to be constructed in accQrdance with Section R106.1. � � ¢ �� �
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<br /> 1 R802.10.2.1 Applicability limits: � Q �
<br /> 52.1 The provisions of this se�Eion shall cantro!the design of truss roof framing when snow controis for �
<br /> ����\ buildings not greaker than 6Q feet(18,288mm)in length perpendicular to*he joist, rafter or truss span, ����...Q�; .�
<br /> /� ��,.,\ ��� not greater than 36 feet(20,973mm} in width parallel to the joist,rafter or truss span,not mare than �����'�a� �
<br /> / �''�� �'��� ��� three staries abave grade plane in height,and ro�f slopes not smaller than 3:12(25 percent slope)ar
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<br /> � �`��, �'� ��� greater than 12:12{1Q0 percent sl4pe).Truss roof framing constructed in accordance with the
<br /> \��` ��\�� � provisions of ihis seetion shall be limited to sites subjected to a maximum design wind speed of 110
<br /> miles per hour(49 rn/s),Exposure A,B or C and a maximum ground snow load of 70 psf(3352Pa). For
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<br /> \ .�� consistent loading of all truss rypes, rvof snow load is to be computed as:0.7 Pg.
<br /> �� R802.20.3 Bracing:
<br /> "• Trusses shall be braced to prevent rotation and provide lateral stability in accordance with the
<br /> 2 � requirements specified in the construction documerrts for the building and an the individual truss design =
<br /> S2."I � drawings. In the a�sence of sp�cific bracing requirements,trusses shalf be braced in accordance with
<br /> � � accepted industry practice such as the SBCA Building Camponenf 5afety lnformation(BCS!}Guide ro
<br /> � k Good Practice for Nandling, lnstalling& Bracing of Meta!Plate Connected Woad Trusses.
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<br /> 0o R802.1Q.4 Alterations to trusses: �
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<br /> � �X15�1�1�,�. ��?C�£ Truss members shail not be cut, notched,drilled,spiiced or otherwise altered in any way withou#the
<br /> . approva!of a registered design professional.ACterations resulting in the addition of load{e.g.,HVAC
<br /> equipment,water heater)that exceeds the design laad far the truss shall not be permitted without
<br /> vet'ificati�n that the truss is capable of supporting such additiona!loading.
<br /> R8U2.11 Rc�o#Tie-Down; �
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<br /> R802.11.1 Uplift resistance:
<br /> ._ Roof assemolies shall have uplift resistance in accordance with Sections R802.11.3.2 and R802.11.1.3.
<br /> 3 2x8 Ledger �
<br /> Where the upiift force does nat exceed 2A0 pounds, rafters and trusses spaced not more than 24 inches
<br /> 52.1 (610mm)on center shafl be permitted to be attached to their supporting waJl assemblies in accord�nce
<br /> with Table R602.3(1).
<br /> Where the basic wind speed does not exceed 90mph,the wind exposure categary is 8,the roaf pitch is
<br /> 5:12 or greater,and the roof span is 32 feet(975�mm) or less, rafters and trusses spaced not more than
<br /> P�I 0 p o s e d F I o o r F ra m i n q P I a n z4 inches(510mm}on center sha11 be permitted to be attached to tneir supporting wall assemblies in
<br /> accordance with 7able R602.3(1).
<br /> Scale: 1/4��=��-Q° R8d2.11.1.1 Truss uptift resistance:
<br /> Trusses shall be attached to supporting waN assemblies by connections capable of resisting uplift forces
<br /> as specified on the truss design drawings. Uplift forces shall be permitted to be determined as specified
<br /> by Table R8Q2.11,if applicable,or as determined by accepted engineering practice.
<br /> R802.11.1.2 Rafter uplift resistance:
<br /> R805 Roof Ventilation: Indivi�ual rafters shalf be attached tp supp�rting wall assemblies by connections capable of resisting �
<br /> uplift forces as determined by Table R802.11 or as determined by accepted engineering practice.
<br /> Connectians for beams used in a roof s stem shall be desi �ed in accordance with acce ted en ineerin �
<br /> R806.1 Ventilation required: Y g p g g a�
<br /> Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of practice. �,
<br /> roof rafters sha(I have cross�entifation for each separate space by ventilaiing vpenings protected - `�'
<br /> against the entrance of rain or snow.Ventilation openings shall have a least dimension of 1/16-inch Section R$03, Roof Sheath'tng Q
<br /> �
<br /> (1.6mm}minimum and%-irtch(6.4mm)maximum.Ventilatian openings having a least dimension{arger �
<br /> than%-inch (6.4mm)shall be provided with corrosion-resistant wire cloth screening,hardware cloth or R803.1 lumber sheathing; �
<br /> � similar materia!with openings having a least dimension of 1(16-inch(1.6mm)minimum and%-inch Allowable spans for lumber used as roof sheathing shal!conform to Table 8d3.2.Spaced lumber O
<br /> (6.4mm� maximum.Openings in roof framing members shal(confarm to the requirements of Section sheathing for wood shingle and shake roofing shall conform to the requirements of Secti�ns R905.7 and
<br /> R802.7. Required ventilation openings shall open directly to the outside air. ��"'
<br /> R905.8.Spaced lumber sheathing is not alfowed in Seismic Oesign Categary D�. (a
<br /> $ �0' 4" L
<br /> 806.2 Minimum vent area:
<br /> The minimum net free ventilating area shall be 1/150 of the area of the vented space. 53.1 SW6 Notch top chord for outriggers RSo3.2 Wood structura!panel sheathing: �
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<br /> ExteptiQn:The minimum net free venti{atian area shail be 1/300 of the vented space provided one or _ . _ _, ,�..�,��� . _ _ .. .,�_�� R8�3.2.1 ldentification and grade: �
<br /> more of the folloa�ing conditions are met: Wood structural panels shaR confarm ta DOC PS 1, DOC PS 2,CSA 0437 or CSA 0325,and shaU be 0� ny
<br /> identified for grade,bond classification and performance category by a grade mark or certificate of fl
<br /> 1.) tn Climate Zones 6,7 �nd 8,Class I or Il vapor retarder is instafled on the warm-in-winter side of the � , _ a. . � __ , .,. - ��: ,. - , _ , 7 inspectian issued by an approved agency.Wood structural panels shall comply with the grades specified Q • � �
<br /> 53.1 �n�'ab�e R5Q3.2.3 (1). •� � � �
<br /> ceiling. �
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<br /> 2.j Not less than 40 percent and not rnore than 50 percent of the required ventilating area is provided R8f13.2.1.1�xposure durability: � � � m
<br /> by ventilators located in the upper portion of the attic or rafter space.Upper ventilatars shail be located � ��=� " ��y �' "`�-W-
<br /> not more than 3-feet(914mm}below the ridge or highest point of the space, measured vertically,with rv� Waad structural panels,when designed to be permanently exposed in outdoor applications, shalf be o# Q a � ,�
<br /> the balance of the required ventilation provided by eave or cornice vents.Where the location of wal!or �� �n exterior exposure durability.Wood structural panel roof sheathing exposed to the underside shall be � � �
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<br /> roof framing members conflicts with the instaHation of upper ventifators, installativn rrtore th�n 3-feet � -- � - � - - � permitCed tp be of interior type bonded with exterior glue,identified as Exposure 1. � � �
<br /> (914mm)b�elow the ridge or highest point of the space shall be permitted. o � „ ���' � o U � � �
<br /> �� � ' Premanufactured trusses @ 24 o.c. f ', � �� R803.z.�.2 Fire-retardant-treated piywood: � �'�- °J
<br /> R806.3 Vent and insuiation clearance: --m - The allowab(e unit stresses#or fire-retardant-ireated plywood, inc4uding faste�er values,shall be � >
<br /> W he ret e av e o�cp r n i c e v en ts a�re ins ta l le d, insu la tion s h a l l no t b i nc k t he free f low o f�r. No t less t ha n a A aCh ne ' wi � developed from an approved meth�d of investigation that considers the effects of anticipated '- "-'
<br /> 1-inch 25mm s ace shafl be rovided between the insulation and the roof sheathin and at the t t W t r u 5 5 t o e x l s t l n t h tem perature and humidit y to which the fire-retardar�t-trea t ed pi ywood will be sub jected,the t y p e o f v
<br /> (o c a t i o n o f t h e v e n t. g treatment and redr in rocess.TMe fire-retardant-treated 1 wood shall be raded b an a
<br /> (2) 16d common nails @ 9"o.c. fulf �- � � T
<br /> -� y g p p y g y pproved
<br /> R806.4 Installation and weather protection: length of top chords, typlCal. agency. �
<br /> Ver�t'tiators shaii be installed in accordance with manufacturer's instructions.Instaflation of ventilators in � Q
<br /> .-...�..,�,u-r,.»..- .�.,M....�r.��..� M
<br /> roof system"s shall be in accordance with the requirements of Section R903. Instaltation of ventilators in - � F - �=�m�--R ._ �, m--� ,� �a, ..,��.�. u� ��,.�,,��� R803.2.2 Ailowabfe spans: � p
<br /> a wall systems sha{I be in accordance with the requirements ot Section R703.1. ---'-�- -��- 7he maximum allowable spans for wood structurai panei roof sheathing shal! not exceed the values set % o
<br /> forth in Table R503.2.1.1(I), or APA E3Q. � �
<br /> R805.511nvented attic and unvented enclosed rafter assembiies: � c„
<br /> Unvented attics and unvented enclosed roof framing assemblies created by ceilings that are applied o
<br /> directly to the underside of the roof framing members and structural roof sheathing applied directiy to R803.2.3 Instaitation:
<br /> the top of the roof framing members/rafters,shall be permitted where all the following conditions are Wc�ad structural panel used as roof sheathing shalf be installed with joints staggered or not staggered in z
<br /> met: accordance with Table R602.3(1),APA E30 for wood roof framing or with Table R804.3 for cald-formed �,
<br /> steel roof framing. �
<br /> 2.) The unvented attic space is completely within the bui(ding thermal envelope. °-
<br /> 2.) IUo interior Cfass I vapor retarders are installed on the ceiling si�1e(attic floor)of the unvented attic P ro p o s e d Ro o f F ra rn i n q P I a n
<br /> as5embly or on the ceiling side of the unvented enclosed roof framing assembly. ���� ��
<br /> Scale: 1/4��=��-Q�� Pfon Title
<br /> 3.) Where wood shingles or shakes are used,a minimum%-inch (6.4mm)vented airspace separates the Proposed
<br /> shingles or shakes and the roofing underiayment above the structural sheathing. Framing Plans
<br /> 4.) In Climate Zones 5,6,7 and 8,any air-impermeable insulation sha11 be a Class II vapor retarder,r�r _
<br /> shall have a Class II vapor retarder coating or covering in direct contact with the underside of the _
<br /> insulation.
<br /> 5.) Insulation sha{I be located in accordance with the following:
<br /> Drawn
<br /> 5.1.) ftem 5.1.1, 5.1.2,5.1.,3 or 5.1.4 shall be met,depending on the air permeability of the insulation Douglas Almond
<br /> directly under the structural roof sheathing. oare
<br /> 5.1.1.)Where only pir-impermeab/e rnsularion is provided,it shall be applied in direct contact 07/10/2017
<br /> with the underside af the structural roof shea#hing.
<br /> 5.1.2.) Where otr,permeable insulation is provided inside the building thermal envelope, it shail � P�an Revisions
<br /> be instalied in accordance with Section 5.1.�n addition to the air-permeable insularion insta�led O _
<br /> directly below the structural sheathing, rigid board or sheet insulation shall be installed directly O _
<br /> above the structural roof sheathing in accordance with the R-values in Table R806.5 far
<br /> condensation controL � "
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<br /> 5.1.�,)Wher�bc�#h air-imp�rmQ�rble and air-p�rm�abl�insu(ation are pravidQd,th�ar'r- O _
<br /> impermeable insu/ation shal}be applied in direct contact with the underside of the structural O _
<br /> roof sheathing in accordance with Item 5.1.1 and shall be in accordance with the R-values in
<br /> Table R806.5 for Condensation contral.The air-permeab/e insu/ation shall be installed directfy P LA N 0 '
<br /> under the air-impermeable insulation. -
<br /> NORTH
<br /> 5.1.4.)Alternatively,sufficient rigid baard or she�t insulation shafl be installed directly above the P�aNs ExnMiNeR APPRova,�:
<br /> structural roof sheathing to maintain the monthly average temperature of the underside of the
<br /> structural roof sheathing above 45°F(7°C). For cafculation purposes,an interior air temperature sneet:
<br /> of 68°F(2Q`Cj is assumed and the exterior air temperature is assumed to be the monthly
<br /> average outside air temperature of the three coldest manths.
<br /> 5.2.} Where preformed insulation board is used as the air-impermeable insulation layer, it sha11 be A 7
<br /> sealed at the perimetgr of each individual sheet interior surface to form a continuous layer.
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