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20150259 Permit Pkg 07172015City of Yelm Community Development Department Building Division Phone: (360) 458 -8407 Fax: (360) 458 -3144 Applicant: Name: PHILIP PERRY Address: 16151 PALOUSE AVE SW YELM WA 98597 Property Information: Site Address: 1AlM PAI 01 M AVF SF Assessor Parcel No.: 32640000500 Subdivision: Contractor Information: Permit No.: 20150259 Issue Date: 7/17/2015 (Work must be completed within 180 days) Phone: 360- 458 -5429 Owner: PHILLIP PERRY Name: PHILIP PERRY Phone: Address: 16151 PALOUSE AVE SW YELM WA 98597 Contractor License No.: Expires: 0 /00 /0000 Project Information: Project: RESIDENTIAL ADDITION Description of Work: DECK EXTENSION AND STAIRS Sq. Ft. per floor: First Heat Type (Electric, Gas, Other): Second Third Garage Basement Fees: Item BUILDING Contractor PHILIP PERRY TOTAL FEES: Applicant's Affidavit: I certify that I have read and examined the information contained within the application and know the same to be true and correct. I also certify that the proposed structure is in conformity with all applicable City of Yelm regulations including those governing zoning and land subdivision, and in addition, all covenants, easements and restrictions of record. If applying as a contractor, I further certify that I am currently registered in the St a of ashington. Signature Date Firm Lot: Fees $ 160.46 $ 160.46 OFFICIAL USE ONLY # Sets of Prints: Final Inspection: Date: By: City of Yolm (36 ) 458-3244 REC #: 00201629 7/17/2015 4:47 PM OPER: CO TERM: 001 REF #: 8760 PAID BY: TRAN: 33.0000 BUILDING PERMITS 20150259 160.46CR PERRY, PHILIP 16151 PALOUSE AVE SE BLDG 160.46CR TENDERED: 160.46 CHECK APPLIED: 160.46- CHANGE: O.UU O R Is 0aC-DCf CITY OF YELM RESIDENTIAL BUILDING PERMIT APPLICATION FORM Project Address: I / >/ �� /vt�1C Aw 34 Parcel #: �r /Oycl CJ Subdivision: #i /% Lot #:_f Plan #: Zoning: d7 New Construction i ! Re -Model / Re -Roof / Addition Home Occupation Sign Plumbing Mechanical Mobile / Manufactured Home Placement XOther Project Description /Scope of Work: Oec-� e ,,c ki /d>7 'f _s4 Project Value: � "/, (wJ ) Building Area (sq. ft) 1 s` Floor 2nd Floor Garage Deck 3u,,' ` Basement Carport Patio 3UL, # Bedrooms_ # Bathrooms_ Heating: GAS /OTHER or ELECTRIC (Circle One) Are there any environmentally sensitive areas located on the parcel? If yes, a completed environmental checklist must accompany permit application. BUILDING OWNER NAME: l'r r�� t zrTy ADDRESS ��S / I N0 )ter S' EMAIL CITY STATE_L,(ZIP ELEPH NE 9gc �j_W MECHANICAL CONTRACTOR TELEPHONE ADDRESS EMAIL CITY STATE ZIP FAX CONTRACTOR'S LICENSE # EXP DATE CITY LICENSE # Copy of mitigation agreement with Yelm Community Schools, if applicable. I hereby certify that the above information is correct and that the construction on, and the occupancy and the use of the above described property will be in accordance with the laws, rules and regulations of the State of Washington and the City of Yelm. n c 91/3/0 Applicant's Signature Date Owner / Contractor / Owner's Agent / Contractor's Agent (Please circle one.) All permits are non - transferable and will expire if work authorized by such permit is not begun within 180 days of issuance, or if work is suspended or abandoned for a period of 180 days 105 Yelm Auenue West Yelm, WA 98597 www.ci.yelm.wa.us (360) 458 -3835 (360) 458 -3144 FAX Page 1 of I I Thurston County Map I AVE SE M Disclaimer: Thurston County makes every effort to ensure that this map is a true and accurate representation of the work of County government. However, the County and all related personnel make no warranty, expressed or implied, regarding the accuracy. completeness or convenience of any information disclosed on this map. Nor does the County accept liability for any damage or injury caused by the use of this map. To the fullest extent permissible pursuant to applicable law, Thurston County disclaims all warranties, express or implied, including, but not limited to, implied warranties of merchant ability, data fitness for a particular purpose, and non- infringements of proprietary rights. Under no circumstances. including, but not limited to, negligence, shall Thurston County be liable for any direct, indirect, incidental, special or consequential damages that result from the use of, or the inability to use; Thurston County materials. iLiurktt►a C 2015 - Thurston County GeoData Center *► k 929 Lakeridge Drive SVV, Suite 216, 2nd Floor Olympia, WA 98502 -6031 CrSE C;�y of `(elm, CD approved 238n LEGEND Moor Roads So Flood Zones Water Bodies http:// www. geodata .orglservleticom.esri.esrimap. Esrimap ?ServiceName= cadastralov &ClientV ersion =4.0 &Form = True... 7/13/2015 £ j AVE SE M Disclaimer: Thurston County makes every effort to ensure that this map is a true and accurate representation of the work of County government. However, the County and all related personnel make no warranty, expressed or implied, regarding the accuracy. completeness or convenience of any information disclosed on this map. Nor does the County accept liability for any damage or injury caused by the use of this map. To the fullest extent permissible pursuant to applicable law, Thurston County disclaims all warranties, express or implied, including, but not limited to, implied warranties of merchant ability, data fitness for a particular purpose, and non- infringements of proprietary rights. Under no circumstances. including, but not limited to, negligence, shall Thurston County be liable for any direct, indirect, incidental, special or consequential damages that result from the use of, or the inability to use; Thurston County materials. iLiurktt►a C 2015 - Thurston County GeoData Center *► k 929 Lakeridge Drive SVV, Suite 216, 2nd Floor Olympia, WA 98502 -6031 CrSE C;�y of `(elm, CD approved 238n LEGEND Moor Roads So Flood Zones Water Bodies http:// www. geodata .orglservleticom.esri.esrimap. Esrimap ?ServiceName= cadastralov &ClientV ersion =4.0 &Form = True... 7/13/2015 7- Sk I C I ) A it's ifs 7A rr ity of Yelm, C®® Approved r-7/1 I- / I �— y dye j ifs 7A rr ity of Yelm, C®® Approved r-7/1 I- / I �— y 7� a. WrIV7 i791 I �tiQ AI S 'ZI .-i e:.5 I- r1i ty of ',wf t--,% I m CDD- Approved 01% T.1 4 _I� Q IS Cit Ol Yelm, C D D Approved iX tv7 IN X7 m ON, 5 I-lk m LIN (No 't_ f 473 fx� FLOORS TABLE R507.2 FASTENER SPACING FOR A SOUTHERN PINE OR HEM -FIR DECK LEDGER AND A 2- INCH - NOMINAL SOLID -SAWN SPRUCE - PINE -FIR BAND JOIST`,', (Deck live load = 40 psf, deck dead load = 10 psf) JOIST SPAN 6' and less 6'1" to 8' 8'1" to 10' 10'1" to 12' 12'1"to 14' I 14'1" to 16' I 16'1" to 18' Connection details On- center spacing of fasteners°, e `/2 inch diameter lag screw with 15/32 inch maximum sheathing' 30 23 18 15 13 11 10 '/2 inch diameter bolt with `5/32 inch maximum sheathing 36 36 34 29 24 21 19 `/2 inch diameter bolt with 15/32 inch maximum sheathing and /2 inch stacked washers e 36 36 29 24 21 18 16 For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 1 pound per square foot = 0.0479 kPa. a. The tip of the lag screw shall fully extend beyond the inside face of the band joist. b. The maximum gap between the face of the ledger board and face of the wall sheathing shall be '/2 inch. c. Ledgers shall be flashed to prevent water from contacting the house band joist. d. Lag screws and bolts shall be staggered in accordance with Section R507.2.1. e. Deck ledger shall be minimum 2 x 8 pressure - preservative - treated No. 2 grade lumber, or other approved materials as established by standard engineering practice. f. When solid -sawn pressure - preservative- treated deck ledgers are attached to a minimum 1- inch -thick engineered wood product (structural composite lumber, laminated veneer lumber or wood structural panel band joist), the ledger attachment shall be designed in accordance with accepted engineering practice. g. A minimum 1 x 9`/2 Douglas Fir laminated veneer lumber rimboard shall be permitted in lieu of the 2 -inch nominal band joist. h. Wood structural panel sheathing, gypsum board sheathing or foam sheathing not exceeding 1 inch in thickness shall be permitted. The maximum distance between the face of the ledger board and the face of the band joist shall be I inch. TABLE 507.2.1 PLACEMENT OF LAG SCREWS AND BOLTS IN DECK LEDGERS AND BAND JOISTS MINIMUM END AND EDGE DISTANCES AND SPACING BETWEEN ROWS TOP EDGE BOTTOM EDGE ENDS ROW SPACING Ledger' 2 inches' 3/4 inch 2 inchesb 1% inches' Band Joist` 3/4 inch 2 inches 2 inches' 15/$ inchesb For SI: 1 inch = 25.4 mm. a. Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck ledger in accordance with Figure R507.2. l(1). b. Maximum 5 inches. c. For engineered rim joists, the manufacturer's recommendations shall govern. d. The minimum distance from bottom row of lag screws or bolts to the top edge of the ledger shall be in accordance with Figure R507.2.1(1). 5" 2" 1 For SI: I inch = 25.4 mm. LAG SCREW OR BOLT STAGGER FASTENERS IN 2 ROWS 5.5" MIN. FOR 2 X 8" 6.5" MIN. FOR 2X 10 © 7.5" MIN. FOR 2 X 12 3/4" MIN. FIGURE R507.2.1(1) PLACEMENT OF LAG SCREWS AND BOLTS IN LEDGERS 'DISTANCE SHALL BE PERMITTED TO BE REDUCED TO 4.5" IF LAG SCREWS ARE USED OR BOLT SPACING IS REDUCED TO THAT OF LAG SCREWS TO ATTACH 2 X 8 LEDGERS TO 2 X 8 BAND JOISTS. 2012 INTERNATIONAL RESIDENTIAL CODE® 147 =�Ot-lllcab ' Effective July 1, 2013 2" min. Floor jc WASHINGTON STATE AMENDMENTS 8507.2.2 Alternate deck ledger connections. Deck ledger connections not conforming to Table R507.2 shall be attached with approved fasteners having equivalent withdrawal capacity or be designed in accordance with accepted engineering practice. Girders supporting deck joists shall not be supported on deck ledgers or band joists. Deck ledgers shall not be supported on stone or masonry veneer. R507.2.3 Deck lateral load connections. The lateral load connection required by Section R507.1 shall be permitted to be in accordance with Figure R507.2.3. Where the lateral load connection is provided in accordance with Figure R507.2.3(1), hold -down tension devices shall be installed in not less than two locations per deck, and each device shall have an allowable stress design capacity of not less than 1500 pounds (6672 N). Exceptions: 1. Decks not more than 30 inches above grade at any point may be unattached. 2_ Where a new deck is being added to an existing structure, the lateral load connection required by Section R507.1 shall be permitted to be in accordance with Figure 8507.2.3(2). siding heathing Figure R507.2.3(2) lashing for +ater tightness Pecking )eck joists Table R502.3.1(2) kpproved joist hangers Pressure treated 2x ledger with fasteners per IRC Table R507.2 Holdown device min 750# capacity at 4 locations, evenly distributed along deck & 1 within 2' of each end of the ledger. Holdown devices shall fully engage deck joist. A fully threaded 318" diameter lag screw predrilled wlmin 3" penetration to top plate, studs, or header. (Insert Facing Page 146) area is not less than that of a quarter circle with a radius equal to the required landing width. Where the stairway has a straight run, the minimum depth in the direction of travel shall be not less than 36 inches (914 mm). Exception: A floor or landing is not required at the top of an interior flight of stairs, including stairs in an enclosed garage, provided a door does not swing over the stairs. R311.7.7 Stairway walking surface. The walking surface of treads and landings of stairways shall be sloped no steeper than one unit vertical in 48 inches horizontal (2- percent slope). R311.7.8 Handrails. Handrails shall be provided on at least one side of each continuous run of treads or flight with four or more risers. R311.7.8.1 Height. Handrail height, measured verti- cally from the sloped plane adjoining the tread nosing, or finish surface of ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm). Exceptions: 1. The use of a volute, turnout or starting easing shall be allowed over the lowest tread. 2. When handrail fittings or bendings are used to provide continuous transition between flights, transitions at winder treads, the transition from handrail to guardrail, or used at the start of a flight, the handrail height at the fittings or bendings shall be permitted to exceed the maximum height. R311.7.8.2 Continuity. Handrails for stairways shall be continuous for the full length of the flight, from a point directly above the top riser of the flight to a point directly above the lowest riser of the flight. Handrail ends shall be returned or shall terminate in newel posts or safety terminals. Handrails adjacent to a wall shall have a space of not less than 1' /2 inch (38 mm) between the wall and the handrails. Exceptions: 1. Handrails shall be permitted to be interrupted by a newel post at the turn. 2. The use of a volute, turnout, starting easing or starting newel shall be allowed over the lowest tread. 8311.7.83 Grip -size. All required handrails shall be of one of the following types or provide equivalent grasp - ability. 1. Type I. Handrails with a circular cross section shall have an outside diameter of at least 1'/4 inches (32 mm) and not greater than 2 inches (51 mm). If the handrail is not circular, it shall have a perimeter dimension of at least 4 inches (102 mm) and not greater than 6'/4 inches (160 mm) with a maximum cross section of dimension of 2'/4 inches (57 mm). Edges shall have a minimum radius of 0.01 inch (0.25 mm). BUILDING PLANNING 2. Type II. Handrails with a perimeter greater than 04 inches (160 mm) shall have a graspable fin- ger recess area on both sides of the profile. The finger recess shall begin within a distance of 3/4 inch (19 mm) measured vertically from the tallest portion of the profile and achieve a depth of at least ' /t6 inch (8 mm) within '/$ inch (22 mm) below the widest portion of the profile. This required depth shall continue for at least 3/8 inch (10 mm) to a level that is not less than 13/4 inches (45 mm) below the tallest portion of the profile. The minimum width of the handrail above the recess shall be l' /4 inches (32 mm) to a maximum of 23/4 inches (70 mm). Edges shall have a mini- mum radius of 0.01 inch (0.25 nun). R311.7.8.4 Exterior wood/plastic composite hand- rails. Wood/plastic composite handrails shall comply with the provisions of Section R507.3. R311.7.9 Illumination. All stairs shall be provided with illumination in accordance with Section R303.6. R311.7.10 Special stairways. Spiral stairways and bulk- head enclosure stairways shall comply with all require- ments of Section R311.7 except as specified below. R311.7.10.1 Spiral stairways. Spiral stairways are permitted, provided the minimum clear width at and below the handrail shall be 26 inches (660 mm) with each tread having a 71/2-inch (190 mm) minimum tread depth at 12 inches (914 mm) from the narrower edge. All treads shall be identical, and the rise shall be no more than 9' /2 inches (241 mm). A minimum headroom of 6 feet 6 inches (1982 mm) shall be provided. R311.7.10.2 Bulkhead enclosure stairways. Stair- ways serving bulkhead enclosures, not part of the required building egress, providing access from the out- side grade level to the basement shall be exempt from the requirements of Sections R311.3 and R311.7 where the maximum height from the basement finished floor level to grade adjacent to the stairway does not exceed 8 feet (2438 mm) and the grade level opening to the stairway is covered by a bulkhead enclosure with hinged doors or other approved means. R311.8 Ramps. R311.8.1 Maximum slope. Ramps shall have a maximum slope of 1 unit vertical in 12 units horizontal (8.3- percent slope). Exception: Where it is technically infeasible to comply because of site constraints, ramps may have a maxi- mum slope of one unit vertical in eight horizontal (12.5- percent slope). R311.8.2 Landings required. A minimum 3- foot -by -3- foot (914 mm by 914 mm) landing shall be provided: 1. At the top and bottom of ramps. 2. Where doors open onto ramps. 3. Where ramps change direction. 2012 INTERNATIONAL RESIDENTIAL CODE° 61 BUILDING PLANNING R311.8.3 Handrails required. Handrails shall be pro- vided on at least one side of all ramps exceeding a slope of one unit vertical in 12 units horizontal (8.33- percent slope). R311.8.3.1 Height. Handrail height, measured above the finished surface of the ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm). R311.8.3.2 Grip size. Handrails on ramps shall comply with Section R311.7.8.3. R311.8.3.3 Continuity. Handrails where required on ramps shall be continuous for the full length of the ramp. Handrail ends shall be returned or shall terminate in newel posts or safety terminals. Handrails adjacent to a wall shall have a space of not less than 1'/, inches (38 mm) between the wall and the handrails. SECTION R312 GUARDS AND WINDOW FALL PROTECTION R312.1 Guards. Guards shall be provided in accordance with Sections R312.1.1 through R312.1.4. R312.1.1 Where required. Guards shall be located along open -sided walking surfaces, including stairs, ramps and landings, that are located more than 30 inches (762 mm) measured vertically to the floor or grade below at any point within 36 inches (914 mm) horizontally to the edge of the open side. Insect screening shall not be considered as a guard. R312.1.2 Height. Required guards at open -sided walking surfaces, including stairs, porches, balconies or landings, shall be not less than 36 inches (914 mm) high measured vertically above the adjacent walking surface, adjacent fixed seating or the line connecting the leading edges of the treads. Exceptions: 1. Guards on the open sides of stairs shall have a height not less than 34 inches (864 mm) mea- sured vertically from a line connecting the lead- ing edges of the treads. 2. Where the top of the guard also serves as a hand- rail on the open sides of stairs, the top of the guard shall not be less than 34 inches (864 mm) and not more than 38 inches (965 mm) measured vertically from a line connecting the leading edges of the treads. 8312.1.3 Opening limitations. Required guards shall not have openings from the walking surface to the required guard height which allow passage of a sphere 4 inches (102 mm) in diameter. Exceptions: 1. The triangular openings at the open side of stair, formed by the riser, tread and bottom rail of a guard, shall not allow passage of a sphere 6 inches (153 mm) in diameter. 2. Guards on the open side of stairs shall not have openings which allow passage of a sphere 43/g inches (111 mm) in diameter. R312.1.4 Exterior woodplastic composite guards. Woodplastic composite guards shall comply with the pro- visions of Section R317.4. R312.2 Window fall protection. Window fall protection shall be provided in accordance with Sections R312.2.1 and R312.2.2. R312.2.1 Window sills. In dwelling units, where the opening of an operable window is located more than 72 inches (1829 mm) above the finished grade or surface below, the lowest part of the clear opening of the window shall be a minimum of 24 inches (610 mm) above the fininshed floor of the room in which the window is located. Operable sections of windows shall not permit openings that allow passage of a 4- inch - diameter (102 mm) sphere where such openings are located within 24 inches (610 mm) of the finished floor. Exceptions: 1. Windows whose openings will not allow a 4- inch- diameter (102 mm) sphere to pass through the opening when the opening is in its largest opened position. 2. Openings that are provided with window fall pre- vention devices that comply with ASTM F 2090. 3. Windows that are provided with window opening control devices that comply with Section R312.2.2. R312.2.2 Window opening control devices. Window opening control devices shall comply with ASTM F 2090. The window opening control device, after operation to release the control device allowing the window to fully open, shall not reduce the minimum net clear opening area of the window unit to less than the area required by Sec- tion R310.1.1. SECTION R313 AUTOMATIC FIRE SPRINKLER SYSTEMS R313.1 Townhouse automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed in townhouses. Exception: An automatic residential fire sprinkler system shall not be required when additions or alterations are made to existing townhouses that do not have an automatic residential fire sprinkler system installed. R313.1.1 Design and installation. Automatic residential fire sprinkler systems for townhouses shall be designed and installed in accordance with Section P2904. R313.2 One- and two - family dwellings automatic fire sys- tems. An automatic residential fire sprinkler system shall be installed in one- and two- family dwellings. Exception: An automatic residential fire sprinkler system shall not be required for additions or alterations to exist- 62 2012 INTERNATIONAL RESIDENTIAL CODE® BUILDING PLANNING the door, provided the door does not swing over the stairway. R311.3.3 Storm and screen doors. Storm and screen doors shall be permitted to swing over all exterior stairs and landings. R311.4 Vertical egress. Egress from habitable levels includ- ing habitable attics and basements not provided with an egress door in accordance with Section R311.2 shall be by a ramp in accordance with Section R311.8 or a stairway in accordance with Section R311.7. 8311.5 Construction. R311.5.1 Attachment. Exterior landings, decks, balco- nies, stairs and similar facilities shall be positively anchored to the primary structure to resist both vertical and lateral forces or shall be designed to be self- support- ing. Attachment shall not be accomplished by use of toe- nails or nails subject to withdrawal. R311.6 Hallways. The minimum width of a hallway shall be not less than 3 feet (914 mm). R311.7 Stairways. R311.7.1 Width. Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the per- mitted handrail height and below the required headroom height. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway and the minimum clear width of the stairway at and below the handrail height, including treads and landings, shall not be less than 31'/2 inches (787 mm) where a handrail is installed on one side and 27 inches (698 mm) where handrails are provided on both sides. Exception: The width of spiral stairways shall be in accordance with Section R311.7.10.1. R311.7.2 Headroom. The minimum headroom in all parts of the stairway shall not be less than 6 feet 8 inches (2032 mm) measured vertically from the sloped line adjoining the tread nosing or from the floor surface of the landing or platform on that portion of the stairway. Exception: Where the nosings of treads at the side of a flight extend under the edge of a floor opening through which the stair passes, the floor opening shall be allowed to project horizontally into the required head- room a maximum of 43/4 inches (121 mm). R311.7.3 Vertical rise. A flight of stairs shall not have a vertical rise larger than 12 feet (3658 mm) between floor levels or landings. R311.7.4 Walkline. The walkline across winder treads shall be concentric to the curved direction of travel through the turn and located 12 inches (305 mm) from the side where the winders are narrower. The 12 -inch (305 mm) dimension shall be measured from the widest point of the clear stair width at the walking surface of the winder. If winders are adjacent within the flight, the point of the widest clear stair width of the adjacent winders shall be used. R311.7.5 Stair treads and risers. Stair treads and risers shall meet the requirements of this section. For the pur- 60 poses of this section all dimensions and dimensioned sur- faces shall be exclusive of carpets, rugs or runners. R311.7.5.1 Risers. The maximum riser height shall be 73/4 inches (196 mm). The riser shall be measured verti- cally between leading edges of the adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/B inch (9.5 mm). Risers shall be vertical or sloped from the underside of the nosing of the tread above at an angle not more than 30 degrees (0.51 rad) from the vertical. Open risers are permitted provided that the opening between treads does not permit the passage of a 4- inch - diameter (102 mm) sphere. Exception: The opening between adjacent treads is not limited on stairs with a total rise of 30 inches (762 mm) or less. R311.7.5.2 Treads. The minimum tread depth shall be 10 inches (254 mm). The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge. The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). R311.7.5.2.1 Winder treads. Winder treads shall have a minimum tread depth of 10 inches (254 mm) measured between the vertical planes of the fore- most projection of adjacent treads at the intersec- tions with the walkline. Winder treads shall have a minimum tread depth of 6 inches (152 mm) at any point within the clear width of the stair. Within any flight of stairs, the largest winder tread depth at the walkline shall not exceed the smallest winder tread by more than 3/8 inch (9.5 mm). Consistently shaped winders at the walkline shall be allowed within the same flight of stairs as rectangular treads and do not have to be within 3/8 inch (9.5 mm) of the rectangu- lar tread depth. R311.7.5.3 Nosings. The radius of curvature at the nos- ing shall be no greater than 9/16 inch (14 mm). A nosing not less than 3/4 inch (19 mm) but not more than 11 /4 inches (32 mm) shall be provided on stairways with solid risers. The greatest nosing projection shall not exceed the smallest nosing projection by more than 3/B inch (9.5 mm) between two stories, including the nos- ing at the level of floors and landings. Beveling of nos- ings shall not exceed' /2 inch (12.7 mm). Exception: A nosing is not required where the tread depth is a minimum of 11 inches (279 mm). R311.7.5.4 Exterior wood/plastic composite stair treads. Wood/plastic composite stair treads shall com- ply with the provisions of Section R507.3. 8311.7.6 Landings for stairways. There shall be a floor or landing at the top and bottom of each stairway. The minimum width perpendicular to the direction of travel shall be no less than the width of the flight served. Land- ings of shapes other than square or rectangular shall be permitted provided the depth at the walk line and the total 2012 INTERNATIONAL RESIDENTIAL CODE®