1101 E MARINE VIEW DR 2019-02-07

Section R311.7 Stairways Designer: R311.7.1 Width: R311.7.8 Handrails: Stairways shall not be less than 36 inches (914mm) in clear width at all points above the permitted Handrails shall be provided on at least one side of each continuous run of treads or flight with four ¢ n handrail height and below the required headroom height. Handrails shall not project more than 4.5 or more risers. U w U inches (114mm) on either side of the stairway and the minimum clear width of the stairway at and t a Q a below the handrail height, including treads and landings, shall not be less than 31-1/2 inches (787mm) R311.7.8.1 Height: o �3 where a handrail is installed on one side and 27 inches (698mm) where handrails are provided on Handrail .height, measured vertically from the sloped plane adjoining the tread nosing, or finish surface m N g both sides. of ramp slope, shall be not less than 34 inches (864mm) and not more than 38 inches (965mm). Exception: The width of spiral stairways shall be in accordance with Section R311.7.10.1. 1015.4 Opening Limitations: o 0 Required guards shall not have openings that allow passage of a sphere 4 inches 102mm in diameter 4 R311.7.2 Headroom: q 9P 9 P ( ) The minimum headroom in all parts of the stairway shall not be less than 6 feet 8 inches (2032mm) from the walking surface to the required guard height. measured vertically from the sloped line adjoining the tread nosing or from the floor surface of the Exceptions: 4� landing or platform on that portion of the stairway. 1. From a height of 36 inches (914mm) to 42 inches (1067mm), guards shall not have openings that Exception: Where the nosings of treads at the left side of a flight extend under the edge of a floor allow passage of a sphere 4 3/8 inches (111mm) in diameter. opening through which of a floor opening through which the stair passes, the floor opening shall be 2. The triangular openings at the open sides of a stair, formed by the riser, tread and bottom rail Jurisdiction: allowed to project horizontally into the req'd headroom a maximum of 4-3/4 inches (121mm). shall not allow passage of a sphere 6 inches (152mm) in diameter. R311.7.3 Vertical Rise: DECK RAILINGS ARE TO BE DESIGNED TO RESIST 200 lbs PLF FORCE ANYWHERE ALONG ITS A flight of stairs shall not have a vertical rise larger than 12 feet (3658mm) between floor levels OVERALL LENGTH. or landings. (X R311.7.4 Walkline: 3200 cedar Street Everett, WA. 98201 The walkline across winder treads shall be concentric to the curved direction of travel through the (425) 257-8810 turn and located 12 inches (305mm) from the side where the winders are narrower. The 12—inch (305mm) dimensions shall be measured from the point of the clear stair width at the walking surface Section R507 Decks Project: of the winder. If winders are adjacent within the flight, the point of the widest clear stair width of R507.1 Decks: N the adjacent winders shall be used. Where supported by attachment to an exterior wall, decks shall be positively anchored to the U R311.7.5 Stair Treads and Risers: primary structure and designed for both vertical and lateral loads. Such attachment shall not Stair treads and risers shall meet the requirements of this section. For the purposes of this section be accomplished by the use of toenails or nails subject to withdrawal. Where positive connection N o0 all dimensions and dimensioned surfaces shall be exclusive of carpets, rugs or runners. to the primary building structure cannot be verified during inspection, decks shall be self— i R311.7.5.1 Risers: supporting. For decks with cantilevered framing members, shall be designed and constructed to Q o t The maximum riser height shall be 7 3/4 inches (196mm). The riser shall be measured vertically resist uplift resulting from the full live load specified in Table R301.5 acting on the cantilevered D between leading edges of the adjacent treads. The greatest riser height within any flight of stairs portion of the deck. F_ > shall not exceed the smallest by more than 3/8 inch (9.5mm). Risers shall be vertical or sloped R507.2 Deck ledger connection to bandjoist: m from the underside of the nosing of the tread above at an angle not more than 30 degrees (0.51rod) For decks supporting a total design load of 50 pounds per square foot (2394 Pa) [40 pounds U •� 17, � from the vertical. Open risers are permitted provided that the opening between treads does not per square foot (1915 Pa) live load plus 10 pounds per square foot (479 Pa) dead load], the a permit the passage of a 4—inch—diameter (102mm) sphere. connection between a deck ledger of pressure—preservative—treated Souther Pine, Incised pressure— Exception: The opening between adjacent treads is not limited on stairs with a total rise of 30 inches preservative—treated Hem—Fir or approved decay—resistant species, and a 2—inch (51mm) n w CL (762mm) or less. nominal lumber band joist bearing on a sill plate or wall plate shall be constructed with 1/2— w a R311.7.5.2 Treads: inch (12.7mm) lag screws or bolts with washers in accordance with Table 507.2. Lag screws, The minimum tread depth shall be 10 inches (254mm). The tread depth shall be measured horizontally bolts and washers shall be hot—dipped galvanized or stainless steel. between the vertical planes of the foremost projection of adjacent treads and at o right angle to R507.2.1 Placement of lag screws or bolts in deck ledgers and band joists: w the tread's leading edge. The greatest tread depth within any flight of stairs shall not exceed the The lag screws or bolts in deck ledgers and band joists shall be placed in accordance with Table o smallest by more than 3/8 inch (9.5mm). R507.2.1 and Figures R507.2.1(1) and R507.2.1(2). o R311.7.5.2.1 Winder Treads: R507.2.2 Alternate deck ledger connections: Winder treads shall have a minimum tread depth of 10 inches (254mm) measured between the vertical Deck ledger connections not conforming to Table R507.2 shall be designed in accordance with planes of the foremost projection of adjacent treads at the intersections with the walkline. Winder accepted engineering practice. Girders supporting deck joists shall not be supported on deck Title: z treads shall have a minimum tread depth of 6 inches (152mm) at any point within the clear width ledgers or band joists. Deck ledgers shall not be supported on stone or masonry veneer. IRC2012 inches (152mm) at any point within the clear width of the stair. Within any flight of stairs, the largest R507.2.3 Deck lateral load connection: Codes S_ winder tread depth at the walkline shall not exceed the smallest winder tread by more than 3/8 inch The lateral load connection required by Section R507.1 shall be permitted to be in accordance _ (9.5mm). Consistently shaped winders at the walkline shall be allowed within the some flight of stairs with Figure R507.2.3. Where the lateral load connection is provided in accordance with Figure Q as rectangular treads and do not have to be within 3/8 inch (9.5mm) of the rectangular tread depth. 507.2.3, hold—down tension devices shall be installed in not less than two locations per deck, Drawn: R311.7.5.3 Nosings: and each device shall have an allowable stress design capacity of not less than 1500 pounds D. Almond z The radius of curvature at he nosing shall be no greater than 9/16 inch (14mm). A nosing not less (6672 N). Dote: /2016 than 3/4 inch (19mm) but not more than 1 1/4 inches (32mm) shall be provided on stairways with R507.2.3 Wood/plastic composites: solid risers. The greatest nosing projection shall not exceed the smallest nosing projection by more Wood/plastic composites used in exterior deck boards, stair treads, handrails and guardrail tf6 than 3/8 inch (9.5mm) between two stories, including the nosing at the level of floors and landings. systems shall bear a label indicating the required performance levels and demonstrating compliance Pion: Beveling of nosing's shall not exceed 1/2 inch (12.7mm). with the provisions of ASTM D 7032. Exception: A nosing is not required where the tread depth is o minimum of 11 inches (279mm). R507.3.1 Installation of wood/plastic composites: O Wood/plastic composites shall be installed in accordance with the manufacturer's instructions.