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<br />Roof Sheathing <br />o Spaced lumber sheathing not allowed in SDC D. <br />o Wood structural panels must have grade stamp F41 <br />.0 Spans for first # of grade stamp assume edge support F41 <br /> <br />[803.1] <br />[803.2.1] <br />_ [T503.2.1.H1)] <br /> <br />sheathing: <br />Roof/Floor <br /> <br />'NER.QA397 PRp.l0B <br /> <br />~--_J <br /> <br />, 0 ~ ~ ~ ~. ~. ~. ~ ~ ~ ~. ~ ~ ~ ~ ~ ~ .~ ~ ~ ~ ~ ~. ~. ~ ~ ~ ~ ~ ~ ~ <br />f'l'~~~~'~~~~:;U~~~--~'\) u u u u -~-~-~--U~-U;;~~~~~ <br /> <br />, . ':,: - ~:_~9~:f;~:~:nr"~;~~~~~~~~~~~!~.~~,~~~~~l;~' ~~= <br /> <br />Roof systems are categorized by their fire rating, class A, S, C, and nonrated. <br />Local or state laws may specify certain minimum ratings, so it is important to <br />check with the local jurisdiction when selecting a roofing or re-roofing system. <br />Other local factors include the need for ice barriers and wind or hi;lil-resistant <br />materials. The IRC provides specific prescriptive rules for roof installations, and <br />more detailed instructions are often specified by the manufacturer or the ASTM <br />standards or the N RCA recommendations. <br /> <br />Roof Surfaces-General <br />o Class A, S, or C req'd per local laws or if <3ft of PL [902.1] <br />o Slate, tile & metal considered Class A fire-resistant [902.1] <br />o Fire-retardant treated wood roofs req test agency label each bundle _ [902.2] <br />o Follow approved manufacturer's installation instructions_ [903.1,904.1] <br />o Flashing req'd at all penetrations & intersections [903.2.1] <br />o Penetrations >30in wide in sloped roofs req cricket F46,47, 71 [905.2.8.3]48 <br />o Drains at each low point of roof unless designed to run over edges _ [903.4] <br />o Overflow drains req'd w/ inlet 2in above low point of roof [903.4.1] <br />o Overflow drains not allowed to be connected to roof drain lines _ [903.4.1] <br />o Hail exposure must be determined prior to material selection [903.5] <br />o Roofing materials must bear identification & test agency labels _ [904.4] <br />Asphalt Shingles <br />o Min slope-2:12 (double underlayment if <4:12) <br />-f/I5 0 Fasteners min 3/4in into sheathing (or through if sheathing <br />~<3j4in) F43 <br />~ 0 Min 4 fasteners per strip shingle (3ft wide) F42 <br />-=USpecial fastening AMI on steep slopes (>20:12) or <br />in high wind areas [905.2.6] <br />o Ice-dam barrier req'd to 24in horiz inside building exterior wall_ [905.2.7.1]49 <br />o Drip flashing below underlayment, rake flashing above <br />underlayment F45 [905.2.8.1] <br />o Closed valleys req min 36in wide valley lining underlayment_[905.2.B.2] <br /> <br />[905.2.2] <br /> <br />[905.2.5] <br />[905.2.6] <br /> <br />Asphalt Shingle Nail Zone <br /> <br />J~ <br /> <br />(ID <br /> <br />Staples must be n <br />fastened horizontally <br /> <br /> <br />II <br />r~ ]'" - <br /> <br />~ <br /> <br />I~ <br /> <br />J <br />If <br /> <br />Nails <br />1in. <br />inset <br />from <br />ends <br /> <br />Staples or nails centered between keyline & tar strip <br /> <br />5/16in. . Asphalt shingles <br /> <br />::~~:~t ~::~~: :;~,:,,:;:,::::;.~;~,:~'''~~'''~'?,,"r:, <br />, + _ . . 1/2in. y , \ <br />1I4in. min.---- ---. ----.---.-- \ . <br />-+- 3/4In. min. Decking <br /> <br />~'"C,=" <br /> <br /> <br />Underdriven 0 d' Crooked <br />ver riven <br /> <br />Clay & Concrete Tile <br />o Clay/concrete tile min slope-211z:12, double underlayment if sA:12 [905.3.: <br />o Double underlayment if slope <4:12 [905.3.3: <br />(Note: Manufacturer's requirements are more stringent, requiring BUR or other membrane <br />systems on roofs below 3: 1 2 slope) <br />o Tile must comply with ASTM standards [905.3.4,! <br />o Tile application AMI & must be appropriate for climate, roof slope, <br />underlayment system & type of tile [905.3.' <br />o Valley flashing min 11 in from center line F44 [905.3.1 <br /> <br />(Note: The Tile Roofing Institute publishes installation manuals for cold & snow regions, <br />moderate climate regions & Florida) <br /> <br /> <br /> <br /> <br />Cricket <br />flashing <br /> <br />ROOF FRAMING TRUSSES ROOFING <br />