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a <br /> STAIR HANDRAIL REQUIREMENTS STAIR FOOTING REQUIREMENTS IR403] <br /> All stairs with 4 or more risers shall have a handrail on Where the stairway meets grade, attach the stringers to <br /> at least one side (see Figure 32A) [R3I 1.7.8]. The the stair guard posts as shown in Figure 34. Posts shall <br /> handrail height measured vertically from the sloped bear on footings. All footings shall bear on solid ground <br /> plane adjoining the tread nosing shall be not less than 34 and shall be placed at least 12 inches below the <br /> inches and not more than 38 inches(see Figure 30) undisturbed ground surface or below the frost line, <br /> (R31 1.7.8.1). Handrails shall be graspable and shall be whichever is deeper(see Figure 34). Stringers shall bear <br /> composed of decay-resistant and/or corrosion resistant on a 2x4 bearing block attached to the post as shown. <br /> material. Handrails shall be Type 1,Type II,or provide Stringers shall not bear on new or existing concrete pads <br /> equivalent graspability(see Figure 32B).Type I shall or patios that are not founded below this depth. When <br /> have a perimeter dimension of at least 4" and not greater guards are not required (see GUARD <br /> than 6-'/".Type II rails with a perimeter greater than REQUIREMENTS),posts may terminate below the <br /> 6-1A" shall provide a graspable finger recess area on both bottom tread elevation. Bolts are only required if a guard <br /> sides of the profile [R31 1.7.8.3]. All shapes shall have a post is required. <br /> smooth surface with no sharp corners. Handrails shall STAIR LIGHTING RF,QUIREMEN'I'S II2303.71 <br /> run continuously from a point directly over the lowest <br /> riser to a point directly over the highest riser and shall Stairways shall have a light source located at the top <br /> return to the guard at each end (see Figure 33). Handrails landing such that all stairs and landings are illuminated. <br /> may be interrupted by guard posts at a turn in the stair The light switch shall be operated from inside the house. <br /> [R31 1.7.8.2]. However,motion detected or timed switches are <br /> acceptable. <br /> Figure 32A. Handrail Mounting Examples. <br /> Figure 33. Miscellaneous Stair Requirements. <br /> _ L .. -- J — — <br /> N D ii <br /> Fasten handrails per manufacturer recommendations t = o <br /> — N cio CD j"min.—.-- y__ -p r0 C <br /> 14.E min, — j- c En7- _ <br /> L Y C <br /> -- • 1."min. I <br /> handrail --:-1- <br /> handrail shall <br /> -- -2x blocking return at each <br /> 11.ruin.---.—I I--- 1z'min. I I-- Stair rise=7 3/4"max end <br /> Stair run= 10"min <br /> 34'•38'to nosing <br /> of stairs,typical 36"mi idth <br /> __ -" 0. <br /> a ____________ <br /> `.----------------- — -------- --------- <br /> cmiisirhandrail hardwarepostI1Riser face must not <br /> 1 " pass 4"sphere when <br /> MOUNTED TO GUARD MOUNTED TO WALL L 1 ; more than 3 risers <br /> — <br /> Figure 32B. Handrail Grip Size. Figure 34. Stair Footing Detail. <br /> 1,1"-2r cut post at bottom tread— (2)Y2"diameter through-bolts <br /> 14 elevation when no stair with washers required only <br /> guard is required if guard is required;otherwise <br /> 1e'" 2" X use(2)#8 wood screws a3-Y� <br /> 2a"max. —"` �Q long or(2)16d threaded nails <br /> E x <br /> 160 .., " ^`°1 E — —i Attach 2x4 bearing block using <br /> min. stair o (8)#8 wood screws a3-'/�long <br /> _ stringer ' or(8)16d threaded nails <br /> 4x4- - --r <br /> NONCIRCULAR CIRCULAR RECESSED post <br /> ER311.7.7,3 Type I] ER311.7.7.3 Type II] 6" E <br /> Perimeter:4"-64' Perimeter:>64" minimum <br /> scd,ri" frost depth <br /> 10"x10"square or-- <br /> 12"dia.footing <br /> Page 11 <br />