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Home My WebLink AboutPLAN ANALYSIS APRIL 12, 2000 - 00-00014 - McDonalds,1 Pro ect Project Address: City of Rexburg Engineering 12 N Center Rexburg Idaho 83440 208-359-3020 Plan analysis �ril arm 11.Tumber -- McDonald Nc�?.Me: McDonaiUls 2nd East St. & Vallev River Occupancy: B,A3 Construction; V -N based on Building Code Date: D. Contractor - 0 Architect: Engineer. Report BY: Aril 12, 2000 Voight Const, Steven A. Ward Westech Engineering Joe La ird NOTE: The code items lisi:ec3 iD this report are not complet-e listing of all possible code requirements It is a giiide to selected q-ections of tl--,Le code- RePortsin created u ' g Plan Analyst software by b w Portions of the mater' ia 1 contained in ts program from the Uniform Building Code with t- I I ne permission International Conference of Building Officials. DIRECTION BOUNDARY �00 NORTH Property 12 -n. - EAST Public way - SOUTH Pubs a. C way WEST Property line Allowable area increased �- Sec. 505.1 SEPARATION4 41R�� REA !NCREASE 9.0 Feet 164.0 Feet E38.0 Feet 42.0 Feet intended to be a in the 1997 UBC. & a. (719) 599-5622 are reproduced of the FIRE PROTECTION 9.0 Feet 114,5 Feet 108.0 Feet 42.0 Feet jj--fj for open area on 3 s1des. 4k oJe r 0 eview �or 0 Project Id,: McDonald's Restaurant Address: 2nd East St, Valley R, iver Dr. 7-1 C L NAME OCC MAX FLR AREA ��r)uaoier Kitchen I Rest F-ooms I Vestibules 1 Restaurant 1 Unisex Rest Room I Janitor Closet I Dining /Play Room TOTAL FOR FLOOR BST ILDTNG TOTAL -- Sec. 504 and Table 5-B R m B B B B A3 ok OAC ok ok ok ok ok ok 345 1436 364 137 1054 60 21 1155 4571 4571 igo ALLOWED RATT O STATUS 12400 12400 12400 12400 12400 12400 124100 9455 114-96 11496 0.03 0-12 0,03 0.0-1 0.08 0-0 0-0 0.12 0.4 0.4 u'lI The actual height of th'I s b -ding ' I s 17. feet. The maximum height of the building is 40. fe.et - -- Table 5,_B EXTERIOR WALL FIRE RATINGS AND OPENING PROTECTION Table 5-A NORTH For Pearin�g Non-Bear-ing Occupancy wall Wall B 1 hour I .our hourI I hour EAST For Bearing Non -Bearing Occu-Qancy wall Wall B 0 hour 0 hour A3 0 hour 0 hour SOUTH For Bearing Non -Bearing Occupancy wa II Wall B C, hour 0 hour A3 C hour 0 hour WEST For Dearing Non -Bearing Occupancy Wall Wall B 0 hour 0 hour A3 0 hour 0 hour Opening Construction Parapet Protection Material Required 3/4 hour Any Yes 3/4 hour Any Yes Opening Cons +L--Iruc t ion Parapet Protection 1 Material Requ'red None Any No None Any No ,Opening Construction Parapet Protection Material Required None Any No None Any No Opening Construction Parapet Protection Material Required None Any No None Any No ok ok ok ok ok ok ok OR ok ok Code review Address: 2nd None �f� �lOUr YC 0� East St. -- No fire Pni A�?cin Valley River. rtc t i n 0 be Dr. real,lirements Page # 3 r openings. Protected with 3/4- 50% Of the -rem of the wall maximum. �OlnoLe & . 503 . .2 Maximum s1 'ngle windowi greater than 12 feet. -- Sec. ' Allowed -- Openings are not permitted OTHER ELEMENT Interior Bearing wall Interior n r it Structural Frame Exterior Strutt Frame Floor/Ceiling Assemhly Roof/Ceiling Assembly Stairs FOOTNOTE: BUILDING ELEMENTS MATERIAL Any Any Any Any Any Any Any hr fire assembles, -- 'fable 5-A 4i1 84 . F t . "11.3.8 L ll Table 5-A RATING 0 hr D hr 0 hr 0 hr Q hr 0 hr None with no dimension NOTES See foatnoi:e #1. _r_j_Le-menLs in an exterior wall located where openings are not permittecH or where protection o� openings is required, shall be protected against external f ire exposure as required for exterior bearing walls or the structural frame,j whichever is greater- -- Table 6 -AY footnote I a Cc.a,e F review 70-r: Protect I.: McDonaldts Address.- rd East SLI, Resta-urant Valley RiveDr. PENETRATIONS OF FTRERESISTIVE ASSEMBLI2S WALLS ASSEMBLIES Sec. 709. Through peinet-rations 0 2} penetrations shall Sec* 709-6-2 Pere trti 11 be installed as --___� �e Frotect�d Page tested in the rated assembly. vea PeD�Lratinn 11ZAve an F rating of not less than the required rating of the wall n tr L d + --Sec Exception: � hen trot � 1, rerrou,s or copper Pipes or steel conduits and the wall is concrete a r., the annular space shall he permitted to be grout or Mortar. The minim-umthickness is t he thickness required to maintain tiae fire rating- maximum sizeir . ivalent t 6 -inch diameter and the opening ' mum of 144 square inches., -- Sec. 709.6.1 Membrane penetrations: "QU'r�MeTltS drg tPQ OaMg ft?,4 L�roug� -- Sec. 7 x Exceptions: Steel electrical outlet boxes that do not excc--,ed _16 square Inches provided that the area of such openings does not exceed 100 square inches for any 100 squareto_tet -� � �1 ��.c-a _ nuxes on OPPOSIte sides of the al y shall be separated by a horizontal .i t o f not l ess than 24 ire tsprInklers with Metal escutcheon Noncombustible pet r t i p items shall combustible tribothsides Confirmedbe that � -it the fire -resistive integrity of wall is Maintained. -- . `1L Code review for: fI .: MAonaldrs Address: end past St. & Uran Valley River Dr. LIED SNDROOF/CEILING ASSEMBLIES 'through n t t i ons Throi rTIn t` t page " SSC r c,l 10115 0i iir- resistive horizontal enclosedbe fire-res'Exceptions: t 5 assemblies Seg -' 1 ntrot i items are i P e , tubes a vent Y y . flOor �4 a 5inu E� one t L�e annular space shall be permitted to be grout or mor The minimum thickness is the thickness required to maIntain ter, the fire rating, The maximum size of the penetrating items is equivalent to a 6 -inch diameter and the opening is a maximum f 144 square inches. 2o Electrical outlet boxes that have been tested for use in fire -assemblies. The SYStem shail have an F rating and a T rating of not less than one hour bat not less than the required rating ()f tHe pec. 710,2.3 t. r Floor penetrations contained located within C.avltY Of a wall do not require T Membrane Penetrations: --forthe penetrations. Sec. 710.3 Exceptions: 1. When penetratinga re steel, ferrous copper conduitsf electrical Outlet boxes, plPes, tubes and vents thrHugh concrete or ma,sonry and the annular space is Protected by an approvedpenetration protected to prevent the Ease passage products of combustion. Such exceed an aggregate arQa of 100 square inches rany squc-zre feet of cei Iing area in assemblies Ott penet�ations. 2. Electrical outlet boxes that have n tested for se in fire -assemblies. . Sprinklers with metal escutcheon L Page 4 6 Code review,zor: Project Td*,: McDonaldis Restaurant iress: InJ East St. & Valley pjv-r r. SMOKE and FIRE DAMpERS __ S Damr)ers shall JDe access Sec. 713.10 and 713.11 1 -iale fOr inspection and servicing: Penetrations through area separation walls. Penetrations through Occupancy separations. 2. Penetrations of the fire -resistive construction of horizontal ex -it walls or corridors serving as a means of egress. Exception: ope ' I fl nings for steel ducts penetrat ncf the required ire resistive construction of corridors are not requ.1red to haVQ 5,Mokc dafflPRrg whoa nch auc-�s are of not less than 0.019 -inch thickness (26 gage) and have no openings servIng the corridor. 3. Penet.-rat, ions of shaft encloslares- Exceptions: I. Duct penetrations by steel exhaust air subducts extend' Ing vertically upward at least 22 inches above the top of the opening in a vented shaf t where the airflow � s upward. 2- PenetratiOns of a fire -resistive floor forming the base of a shaf -I--- enclosure may he protected by f ire L dampers listed for installation in the horizontal Position. 3. Smoke dampers are riot required when shaf t is exhaust only, and' 4. Penetratior -is used for cOntinuously operating fans, s of the ceiling of fi or roof -ceiling assemblies. ire-res-Istive floor -ceiling Exception: Smoke dampers are not required. 5. Penetrations of an atrium enclosure element. Exception- ISmoke dampers are not required. Penetrations of exterior walls where protect, is required. 'On of openings Exception: Smoke dampers are not required. 7". Penetra�ions of area Of refuge. Exception: Ventilation SYStem designed tO suPPIY Outside a2 -r during an emergency. t 8. Smoke dampers are required in Smoke libarriers and or obbes. DRAFT STOPS: If there Is cOmhustiblnstruct' stops shallra be ' lon in the roof/ceiling assembly, draft exceed 3,000 1 -stalled so that the area Of concealed space does not square feet and so that the hori steps does not exceed 60 feet. --Sec i��ontal dimension between 10 702.3-1-2.2 Code review Project Id.: Address: 2nd for McDonald's East St. Restaurant Valley River ]Dr. OCCUPANCY SEPARATIONS s- Table - B- . r Page # 7 HEATING I 'ME 's SEPARATION FOR R u -A -N: A 1 hr. occupancy separation 'is required around rooms containing a boiler or central heating -- Sec. 302-5 unit greater than 400{ BTU I -nut - F OCCUPANCY is required around rooms containing a boiler or central heating unit r than Sec. * input, ADDITIONAL SEPARATIONS A refrigeration machinery room ahali be senar;�f,2,r� F,,, OL t uiiding as re CJUI red for an H7 horizontal Occupancy separation area of the machiriery room- Structural protected for the type of constructs on hour sel arati an i Q -v- F EXIT TOTAL NOTE; In, the REQUIREMENTS* Sema occupancy regardless of area_ limited t the actual upot elements shall be only. -- Sec. 2802 tiom an E occupant Table -LVt-U111_r_J NUMB MIN MIN PANIC HALLWAY/ occ EXITS WIDTH HDWR CORRTDOR SWING --------------------------------------- kitchen Rest Roams Vestibules Restaurant Unisex fest Room Janitor Closet Dining /Play Room ACI 7 I 7 ACI 77 154 1 2 1 2 2 . 1.4 0-8 . 14.0 0.2 0.0 1;4 30.8 Areas with r1 before the number of treated as an accessory for occupant _- Sec. 1.2...1r Exception N/A, SIA N/A N/A NIA N / A NIA N/A N/A iV/R NfR N/R. NiR Out N/R 11T/R Out Out Occupants area is being I. 4 areas wLere 2 exits are required, the minimum Separation is 1/2 ot maximum d-Lanal of the area When 2 exits are -required, to go in either direction separate epi t, except for Sec* 1004. 2,6 exits must from any point dead ends not arranged so that in a corridor or exceed' f eet 1 , Is Possible. hallway to a in length. it Code regi for: f roject Id.:McDonald's Restaurant Address: grid East St. & ValleyRiver Exit are required �r all areas where 2 or exits are Sec. _1003.2-8.21tion. No P0 I-nt to be more than 100 feet from an exit sig -1 Main exterior exit doors` 'OUsly and as exits need clear-1ire identifiable t be signedwhen approved. -- Sec. 1003.2.9,2, Door swing is based on Sec- 1003.3.1-5 except as noted. Exception Occupant load factor is teased on Tahle 10-A. Number of ex,ts is based on Table 10-A except as noted., Exit width is in des and based orl Sec. 1003-2.3 and Table 10-B Exit width is o be divided aPProxirnately -i - Sec. � . . equally exits, �Pllidth shown for all areaas is based on other egress componeiats- beaed on other egress corgi ��it � for ter f1 priest basements i s based Viable 10-B stairways. For the minimum width of door For the minimum width of hallways, see Sec. 1004.3-3.2 For the minimumTei .t f corridors, see . 1004.3-4.2 For the in' um width f stairways, see Sec., 1003-3.3.2 FOOTNOTES. 4) Panic haraware is based on Sec. 1007.2-5 see except, rri exit in A-3' es and churches, FLUSH AND SURFACE BOLTS Manually operated edge- or Mace -mounted flush bolts and surface bolts or any other type f device that may used to close or restrain the the door other than by operation of the locking shall not be used. n. automatic flush bolts are used , the door leaf havJj_ng tHe automatic flush bolt shall not have a door knob or hardware. Figs unlatching f ars l ruz r r thanf shall not LOCKS AND LATCHES: Regardless f the Occupant served, exit doors l be r thewithout the}� any speciai effort. -_ Sec. 1003-3.1-8 knowledge or Kew locking hardware may be u consists Of a single doorar it In exit Tu%Then the mai i t THIS DOOR 1 T REMAIN UNLOCKED i� there � i to' door(s) must i BUSINESS HOURS. When unlocked p r _. any latching i 40 Code rJLw Prot Id Address: 2nd for; McDonald East st. Restaurant Valley River Dr. gage LANDINGS AT DOORS 1) A floor or landing all be -Provided on each access When fO-r shall Inot be more than 112 inch lowrdisabilitiesrequred..tf� r landing er rl she threshold. When access is not required, she inaximum is I i h -- Sec. 1003.3-1.6 2) Landings sha- 1 have a wrdtjj not less than. the w'dtn of the ��,-tairway or width of C -_he j whichever 's the greater ., Where serves an aril l� d of 50 or more, doors inPosition shall not reduce the 111-7-nding dimension to 1.ss than one half it required _ - Sec. _1003.3-1.7 'on of exit travel 44 in . "GRAVEL DISTANCE: distance to an exit) THe maximum travel distance in this R ng is 200 feei- nclosure or ex Travel distance shall not be limited within an exit e Sec.1004.2.5.2.1 passageway, -- Sec. 10 t . z Page Code -L-eview for: Project I.: l!s Rest r nt Address-. n East St. & ValleyRiver Dr. BUILDING iE IETL 1 1 T- i s u i l in including each tenant shall be provided i th at least one entrance whichm lies with the accessihle route provisions of CARO/ANSI A117.1. At least 50 percent of all entrances shall be accessible. -- sect 1103.2.3 lblh n more that one exit 'is required from any accessible space, each access ible portion of the space shall be served by not less than two accessilale meansf egress. -- Sec. 1104.1-1 3) When n exit stairway is part of an access-il means of egress, the stairway l l have a clear width of not less than 48 inches between t handrails. The stai-_rway shall either incorporate n area of refuge Ci thin enlarged story -level landing r shall be accessed from n area of refuge. -- pec. 1104 t 1 F The area of refuge shall have in access to the stairway that serves it. -- Sec. 1104.2.1 4) Each area of refuge shall he sized to accommodate one wheelchair space t less than 30 inches by 48 inches for each 200 occupants, or portion thereof. -- Sec. 1104.2.3 5) if the area of refuge is not within the stairway, it shall be separated from the rest of the story by a smoke]carrier having t least a one- 'hour rae- 'h ur fire -resistance rating. Smoke barriers shad extend to the roof or floor deck above. Doors shall be smokes and draft control assemblies with a rating not less than 20 minutes. -- Seco 1104. .4 6) Two-way co=unications are required. -- Sec. 1104.2.5 7 Each area must be identified by a sign statire l E E REFUGE and the international symbol of accessibility. -- Sec. 110 4 . . 7 8) NOTE: Exit stairways in bull-.1dings protected throughout by ars approved automatic sprinkler system are NOT required to incorporate an area of refuge. -- Sec. 1104.1.2, Exception.. ROOFING 1} The 2 ) See REQUIREMENTS: roofing this buildl'ng is reqijired to section 1504 and ICBO research reports AUTOMATIC P I L . If openings are not is floor area more sprinkler system i min .i um dimension n opening in every 50 be Class C. -- Fable 1- for requirements. SYSTEMS: Prov-1cl: in each 50 feet of exterior wall or there than 75 feet from exterior opening, ars automatic required. -- Sec. 9,04.2-2 Note Openings seal l have f 30 inches. There mint be at least 20 sq.ft. of lineal feet of wall. STANDPIPE REQUIREMENTS: There is no requirement f r FOOTNOTES: standpipe. - - Table - Code review Project Id.: Address: rid for: T D rz 1 .' East St. Restaurant Valley River Dr_ ENT LAST All areas customarily occupied by til t Tori by means of open -able less than 1 f the total floor mechanically opera t ti is t i r� - of supplying a minimum of 15 tubi occupant. Sec. 1202.2 ,1 Page # 11 hu -mans shall be provided with natural xterior openings with an area of not area or shall be providedwith system. Such system shall be capable feet per minute of outside air per WALL AND CEILING FINISH: 1 Wall and ceilingfinish materials are required to compiy with Sec. B04-1 and Table 8-B. 2) Carpeting on the ceiling is required to have a Class I flame spread rating. -- Sec. 804 3) Textile wall coverings shall have Class I flame spread rating. and shall be protea wed by automatic sprinklers or meet the acce--Qtance criteria of U.B.C. Standard - - -- Sec 4) Toilet room floors shall have a smooth, hard nonabsorbent surface that extends upward onto the walls at least 5 ire -- Sec. 807.1.1 5) Walls within 2 feet of the front and sides of urinals and eater closets shall have a smooth, hard nonabsorbent surface. -- Sec. 807.1.2 INSULATION TION 1 TE 1 All insulation t r i al including facings are required flame -spread rat i f 25 or less and a maximum smoke -unless it 'is in a concealed space and the facing is in 2) Foam Plastic insulations are required to be protected. have density contact a of 450 with -_ Sec* 2602 ADDITIONAL REQUIREMENTS For 2 occupancy For A3 occupancy PLATFORM; 1 Permanent l t form shall he constructed of materials as required for the building tie of constriiction., -- Sec. 405.2 2) If the area under the platform is used for any purpose(including storage) other than equipment wiring or plumbing, then the floor construction shall be not less than 1 hour fire resistive. -- Sec. 405..2 Code review for: Project Id.: McDonald's Address: 2nd East St. Restaurant _ Valley River Dr. Floor -1st Occupancy -Din -Ing 'Shen GeatE are not fixed, be posted t '77 occupants in rear the main exit. /Play Hoorn the capacity of in a conspicuous - Sec. 1007.2.6 Page # 1 is area is r t place n approved Page # 13 Code review for - Prop ect Id.: McDonald's -F.estau-]fant Address = 2nd East St. River D -t - ACCESSIBLE FACILITIES: NOTE: Except as noted, section numbers listed below are fro -m Al A117.1 - 1992 IA. TEF FOUNTAINS AND WATER COOLERS: At least 50 percent of drinking foun-L-ains, but not less than one, provided on every floor shall be accessible. -- TJBC Sec- 1105.4.1 Accessible units must comply with the following: 1) SPOut is to be within 36 inches of the floor. -- Sec. 4.15.2-1 2) Spout arranged for parallel approach shall he located 3 inches maximum fl -c -ria the front eclge- Spouts of cantilevered units with knee and toe clearances shall be located 15 inches minimum from the vertical support and 5 inches maxim= from the front edge. -- Sec. 4.15.2.2 3) Spouts shall provide a flow of water 4 'Inches height m-ini-mum.. -- Sec. 4.15.2.3 4) Operable parts shall be localEl-ed at or near the front edge of the unit and shall comply with 4.25.4 -- Sec. 4.15.3 5) A cantilevered unit is required to extend 17 inches minimum from the vertical support. Clear knee space must provide a clear area of 8 inches in depth a'7-- 27 inches high and 11 inches at 9 inches minimum above the floor. -- sec. 4.15.4.1 6) Forward approach units shall comply with 4.2. Units in El-,Llcoves shall comply with 4.2.4.4. Units not having the necessary knee and toe clearance or clear space under them shall comply with and have a clear f l space thcatt allows a person in a wheelchair to make Parallel approach- -- Sec., 4.15.4.2 TOILET FAC ILITT ES: 1) A 60 inch diameter unobstructed turning space is required in the toilet room. -- Sec. 4.16.3, 4. 2.3 & Fig. B4.2.3 2) Water closet shall be mounted adjacent to a side wall or partition. The distance from the side wall or partits to the centerline of the water closet shall be 18 in. Sec. 4. 17.1 3.) When the accessible water closet is not in a stall: The clear floor space shall he 48 in minimum in front of the water closet and 42 in from the center line of the water closet on the side riot .djacent to the wall. -- Sec. 4.17 .2 & Fig. B4.17-2 4) When the accessible water closet is in a stall: The stall shall be 60 in wider minimum and 56 in deep minimum for wall hung water closets and 59 in deep minim ` um for floor mounted water closets. -- sec. 4.18-3.1 If' the door swings into the stall, the required depth shall he increased by 36 inches minimum} -- Sec. 4-18.3.2 & Fa -g- B4.18.3.1 5) The bars are to be 33 to 36 inches above the floor and shall be provided on the rear wall and on the side wall closest to t. ---he water c-oset- -- Sec. 4-24-2.2 & Figs. B4.17.3, B4.17.4 and B4.18.3.1 a) Side grab ]gar is required to start within 12 inches of the IDac k wall and extend to 54 inches from the back wall., (The minim -um lerigth of the bar is 42 in) pec. 4.17.4.1 Cocie review for: Project Id.: McDonal ' t urant Address: 2nd East St, & Valley River Dr. 7) JO 9) 10) 11} 12) Figs. 24.17.3 and B4.18.3.1 Page # 14 -e rear nar s-ftaii be 24 in ionloncr mini'milm ater closet. 'there I � ung minimum, transfer side. ana B4.18.3.1 space permats, the bar centered on shall hQ ii the ifl wa.t� e a it-iona ength provided the top or the seat on the water closet i s required to be 17 tO 19 inches above the floor. ` sec, 4.17 Accessible ril: 1l f the stall i � � �� with the rim t 17 inches imu above the floor. - clear area of 30 X 48 i ii �� imum is it in f root f the urinal. Privacy shields shall m e ten& beyond the front edge of the urinal rim, - n l they are 30 inches apart min' -- -Sec. 4.19.3 Accessible lavatories shall be mounted with the rim 34 inches maximum e the floor ars clearance of 29 inches from the floor t the bot torn of the front edge of the apron. -- - Sec. 4.20.2.1 Fi . B4.20-3.1 It shall ��. 17 inches minim-iim from the wall. space shall be 8 inches ire depth minimum at 27 ire ches minimum above the floor and 11 inches in depth minimum at 9 in minimumy above the floor- The dip of the overflow checking the clearances. -- Sec. 4.20-.3.1 clear floor space of 30 X 48 inches minim hal 1 be Provided in front of the lavatory n h l i extend 19 inches max' under the lavatory. Sec. 4.20.3.2 'dater supply and drain pipes under lavatories insulated or otherwise treated to protectagainst -- 1 The bOttom of mirror is required to be within the floor. - - Sec. 4.16.6 & Fig. B4.20.3. -'L 38 inches of Code review for: Page # 15 Project I. -McDonald's Ad -dress: 2nd, East Valley GLAZING REQUIREMENTS All glazing in hazardous1t- ' glazing material,, ons is required to I oe of safety Locations-. Sec. 2406.3 & 2406.4 1) Glazing 4-n- ingress and egress doors excePt jalousies. Glazing fixednslid' n panels f sliding dOOr assemblies and panels in swinging doors other than wardrobe doors. 3) Glazing i toren doors. 4) Glazing in X11 unframed swinging 5) Glazing in doors and enclosures steam rooms, bathtubs and showers- Glazing in . Portion building wail losing these compartments edge of the glazing 'is less than 60 nches above a and drain inlet_ face ) Glazing irl f'xed or operable panels adjacent nearest exposed a 24 -inch -arc of either vertical . ire arti l edge f the door In a to 3 bcttom exposed edge of the glazing is lession and where the walking surface. PCs 60 Inches above the 7) GlazingGlazi'ng in an incl-lul fixed locations described ila -1-teras 5 a-irid 6 above, than meets all of the following n ition : A. Exposed area of ar lil bane greater than 9 squarefeet. B. Exposed bottom edge less than 18 inches above the 'Floor. C. Exposed top edge greater than 36 inches above the floor. D. One or inore walking surfaces within 36 inches horizoritally of the plane f the glazing. 8) Glazing 'in railings regardless of height above a walking surface. Included are structural baluster panels and nonstructural in -fill panels. 9) Glazing in walls and fences used as the barrier for indoor and outdoor swimming Poolsand spas when the bottom edges i 60 inches above the pool side and t ' of the pool or spa water, s n 5 feet 10) Glazing i llenclosingis less thari stairway 1ria-0s or within 5 feet of then bottom and top of stairways wliere the bottom edge is less than 60 inches above the walking