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<br /> IF THIS PLAN IS NOT ON 22x34 PAPER, IT HAS BEEN SCALED ACCORDINGLY
<br /> Code References: � .� �
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<br /> Attic area venting calculation: �
<br /> R806 Root VenLllation:
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<br /> R806.1 Ventilation required; � w � > Q o
<br /> Total N E W Attic Area i n sqft: 1,712.00 / 150 Enclosed attics and enciosed rafter spaces formed where ceitings are applied directly to the und+erside of (� � �, s 3 m
<br /> roof rafters shall have crou ver�tilation for each separote space by ventitating openings protected � �j � �� 'ux_'
<br /> Required Area of Venting: 1643.52 Sqlil against the e�trance of rain or snow.Ventilation openings shall have a least dimension ot 1/16-inch � � m ,N
<br /> (2.6mm)minimum and Y.-inch{6.4mm)maximum.Ventilation openings having a least dimension larger � � o � °O
<br /> than'k-inch(6.4mm)shall be provided with corrosion•resistant wire cloth screening,hardware cioth or � � o o s o
<br /> R2 W(6.75sqin/If�: 7�.5 ft 482.625 Sqlrl similar material with openings having a least dimension of 1/16-inch(1.6mm)minimum and h-inch � ,� o �o o ,,;
<br /> RS400 (18.75sqin) 46 ea 862.5 SqICI (6.4mm)maximum.Openings in roaf framing mernbers shall conform to the requirements of Sedion � ; v, N ,
<br /> R802.7.Required ventilation openings shall open directty to the outside air. � ¢ �
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<br /> 806.2 Minimum vent area: f N
<br /> Total Proposed Venting Area: 1345.12 5 Sqln Tne minimum net free ventilating area shal!be 1/150 of the area of the vented space. � _��!� �
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<br /> Exceptinn.The minimum net free ventilation area shail be 1/300 0#the vented space provided one or
<br /> more of the following cond'+tions are met:
<br /> The above calculations are based upon Cor-A-Vent�
<br /> 1.} In Climate Zones 6,7 and 8,Gass I or tl vapor retarder is insialled on tfie wa�m-in-winter side of the
<br /> products and specifications. �e���ng. �
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<br /> 2.} Not less than 40 percent artd not more than SO percent of the required ventilating area is provided Z �
<br /> by ventilators located in the upper portion of the attic or rafter space.Upper ventitators shall be located �
<br /> not more than 3-feet(914mm)below the ridge or highest point of the space,measured vertically,w'rth �
<br /> �
<br /> the balance of the required ventilation provided by eave or cornice vents.Where the Iocation of wall or .�
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<br /> roof freming members conflicts with the instaNation of upper ventiiators,installation more than 3-feet �-' °'rn,D N �
<br /> (914mmj below the ridge or highest point of the space shall be permitted. � � o� ;
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<br /> R806.3 Vent and insulation ctearance; �(� *' Q�� E "
<br /> Where eave or cornice vents are installed,insulation sha11 nat block the free flow of air.Not less than a `/ `� L 16��
<br /> C o�N C
<br /> 1-inch(25mm)space shall be provided between the insulation and the roof sheathing and at the p v-o��
<br /> �� location of the vent. v � 3��
<br /> , D R805.41nstaltation and weather protection, � �� �
<br /> ��• 5 �y�-'�- L^�� � Ventilators shall be installed in accordance with manufacturets instructions.Installation of ventilators in � `
<br /> _ _ __ _ ______ `_______ _ � roof systems shall be in atwrdance with the requirements of Section R903.Installation of�e�tilators in ... E
<br /> � a wall systems sha11 be in accordance with the requirements of Settion R703.1. � ;
<br /> I �'� R806.5 Urnented attit and urnented enclosed rafte�assembHes: � #
<br /> So�FyT J�T � i Unvented attia and unvented endosed roof framing assernblies created by ceilings that are applied
<br /> r--------------------- ---------------------
<br /> ---------------------------------------------------------------------- directl totheundersideoftheroofframin membersandstructuralroofsheathin applieddirectl to
<br /> {---- rt---------� Y 6 B Y
<br /> � �-----------------------'i----------------------- ----------------------------------------------------------------------- --------� I ; thetopoftheroofframingmembers/rafters,shallbepermittedwhereallthefoAowingconditionsare
<br /> � � I ! � � ' met
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<br /> I I � � � I 1.} The unvented attic space is compdetely within the burlding therrna!envebpe.
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<br /> � _i ` � � i � , 2J No interior Class 1 vapor retarders are installed on the ceiling side(aitic floor)of the unvented aitic
<br /> I ��, � � ' assembly or on the ceiling side of the unvented enclosed roof framing assembly.
<br /> i � ; � k e��` ; � �
<br /> � � � � c� �a � i � I 3.) Where wood shingles or shakes are used,a minimum'/.-inch(6Amm)vented airspace separates the
<br /> ( F 3 � � � shingles or shakes and the roofing underlayment abave the structurai sheathing.
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<br /> � � j � i � A.J In Climate Zones 5,6,7 and 8,any air-r'mpermeab/e insufatron shall be a qass It vapor retarder,or
<br /> � � I I I � j shall have a Class Q vapor retarder coati�g or covering in direct contact with the underside of the
<br /> � � � � � � insulation.
<br /> I � I � � !
<br /> i � I � j � I S.J Insulation shall be located in accordance with the foltowing:
<br /> I I � � � ,
<br /> � I � � I ' S.1.) ltem 5.1.1,5.1.2,5.1.3 or 5.1.4 shaU be met,depending an the air permeability of the insulation
<br /> � � � � � � directly under the structural roof sheathing.
<br /> � � I I I � I'
<br /> � I � I � j I 5.1.1.)Where only air-impermeabfe insulotron is provided,it shall be applied in direct contact
<br /> ; � j � i '� with the underside of the structural roof sheathing.
<br /> I � ' ( I I ' �
<br /> � � � � 5.1.2.)Where air-permeab�e insufation is provided inside the building thermal envelope,it sha11
<br /> A � � j '�'j i � I I, be installed in accordance with Section 5.1.In addition to the air-permeabre insulation installed "
<br /> j � I '�f� i i � , directly below the structural sheathing,rigid board or sheet insulazion sha11 be installed direcily �
<br /> ii i _ _ - - - _ _ _ _� - - I i i , above the strudural roo#sheathing in accordance with the R-values in Table R806S for �
<br /> �! I condensation control, w
<br /> �- - � I � 4--
<br /> I —j-I � i j , 5.1.3.)Where both air-impermeable and air-permeable insulation are provided,the air- �
<br /> ; I � � � � � impermeable insulotion shall be applied in direct contact with the underside of the structural �'
<br /> ' � j � 1 roof sheathing in accordance with Item 5.1.1 and shall be In accordance with the R-values in v
<br /> i I � Ridgeline i I !, Table R$06.5 for condensation controL The air-permeable insu/o[ron shaN be instalied directly �
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<br /> � � � �,,,� �,�a�. ��,� � � % A under the air-impermeable insulation. O
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<br /> i � I � j � 5.2,4.j Alternatively,su�cient rigid board or sheet insulation shall be installed directiy above the ',�
<br /> i � i I � � structural raof sheathing to maintain the monthfy average temperature of the underside of the �
<br /> _ � � i I structural roof sheathing above 45"F{�"C).For calculation purposes,an interior air temperature �
<br /> i � j - - - - - - - - - - - - - - - - - - - - - � - —j-1— - � -t—J af 68"F(20'C)is assumed and the exterior air temperature is assumed to be the monthly �
<br /> i �i � e J � average outside air temperature ot the three coldest months. .�
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<br /> ; 11i I \Q\ I �-----------------------------------------------------------------------------r---------� ; 5.2.) Wherepreformedinsulationboardisusedastheair-impermeableinsulationlayer,itsfiallbe Q �
<br /> I � I �\
<br /> ! �� I I j I sealed af the perimeter of each individual sheet interior surface to form a continuous layer. N �
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<br /> � h� � � i I ' R807 Attic Access: � �
<br /> i �� j j � � i 8uildings with combustib}e ceiling or roof construction shall have an atiic access opening to ottic areas � � m
<br /> � � I I � � that have a vertical height of 30-inches(752mm)or greater over an area of noi less than 30-square feet � � �
<br /> �� � � � i (2.8 m2J.The vertical height shall be measured from the top of the ce3iling framing members to the C �
<br /> � I � � � � underside of the roof framing members. � � �
<br /> ! j � I � 1 � Q C
<br /> i I � � I � � � The rough-framed opening shall be not less than 22-inches by 3D-inches(559mm by 762mm)and shall Q p
<br /> I � � � i I be located in a halfway or other readily accessible location.W here located in a wall,ihe opening shall be � �
<br /> i � � � � �� not less than 22-inches wide by 30-inches high(559mm wide by 762mm high).Where the access is � � �
<br /> � I I � � W lotated in a ceiling,minimum uno6stcucted headroom in the ottk space shall be 30-inches(762mmj at V O �
<br /> � � � � � 1 \�¢' �i 7 y some point above the access measured verticaliy from the 6ottom of ceiling framing members.See � N v�
<br /> jI i q�� i � \��� '�' �_ � i Section M1305.1.3 for access requirements where mechanica!equipment is located in attics. � O �
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<br /> �}�-- L------------------------i-----------------� I '►n
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<br /> Plan itle
<br /> 'k— ` — I � v New Upper Roof
<br /> � Proposed Plan
<br /> ro c o
<br /> 08-001-06
<br /> Drawn '
<br /> D. ALMOND �
<br /> Dote -
<br /> 06/06/2018
<br /> Plan Revisions
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<br /> PLAN 8 - �
<br /> NORTH 80 -
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<br /> Approval(s):
<br /> Sheet:
<br /> Pro osed New U er Roof Plan �- F �v��c i,- /� � . 5
<br /> _ �� , � �
<br /> SCALE: 1/4,�_�,_��� Fl��'l��i�� ���? �'��r1/I�T
<br /> or.• —
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