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4.1.7 Acceasible Buildings Historic Preservation
Table 2 Allowable Ramp Dimensions for Construction in Existing Sites
Buildings, and Facilities
EXCEPTION: In instances of ateration work where provision of a standard stall (Fig. 301a) is structually impracticable or where plumbing code requirements prevent combining existing stalls 10 provide space an aternate stall (Fig. 30b)) may be provided in lieu of the standard stall
In Assembly areas.
(1) in alterations where it is structually impractic able to disperse seating throughout the assembly area seating may be located in collected areas as structurally leasible. Seating shall adjoin an access. ble route that also serves as a means of emergency ogress.
(*) in alterations where it is structurally imprac. licable lo atter all performing areas to be on an accessible route, then at least one of each dype shall be made accessible
(5) Housing (Reserved.
A slope steeper than 1:8 not wlowed.
4.1.7 Accessible Buildings. Historic Preservation
(b) Stairs. Full etension of stair handails shall not be required in alterations where such extensions would be hazardous ar impossible due to plan configuration
(1) If a safety door edge is provided in existing automatic elevators, then the automatic door reopen. ing devices may be omided (see 4.10.6).
() Where existing shalt or structural elements prohibit strict compliance with 4.10.9, then the minimun Moor area dimensions may be reduced by the minimum amount necessary. but in no case shall they be less than 48 in by 48 in (1220 mm by 1220 mm.
(a) As a general rule, the accessibility provisions of part 4 shall be applied to "qualified" historic buildings and facilities. "Qualified" buildings or facilities are those buildings and facilities that are eligible for listing in the National Register of Historia Places, or such properties designated as historic under a state of the appropriate stale or local government body. Comments of the Advisory Council on Historic Preservation shall be obtained when required by Section 106 of the National Historic Preservation Act of 1966, as amended 16 U.S.C. 470 and 36 CFR Part 800. before any alteration to a qualified historic building.
(b) The Advisory Council shall determine, on a case.by.case basis, whether provisions required by part 4 for accessible routes (exterior and interior). ramps, envances, toilets, parking, and displays and signage would threaten or destroy the historic significance of the building or facility
(c) If the Advisory Council determines that any of the accessibility requirements for features listed in 4.1.711) would threaten or destroy the historic significance of a building or faciláy, then the special application provisions of 4.1.7(2) for that lea. ture may be utilized The special application pro visions listed under 4.1.7(2) may only be utilized following a written determination by the Advisory Council that application of a requirement contained in part 4 would threaten or destroy the historic integrity of a qualified building or facility.
(i) Where existing elements prohibit strict com. pliance with the clearance requirements of 4.135, a projection of 5/8 in (16 mm maximum will be per. mited for the latch sick door stop.
() if existing tresholds measure 3/4 in (19 mm high or less and are beveled or modified to provide a beveled edge on each side, then they may be retained
(e) Toilet rooms. Where alterations to existing lacinies make strict compliance with 4.22 and 423 structually impractkable, tire addition of one "uniser" toilet per floor containing one water closet complying with 4.16 and one lavatory complying
# the side reach is over an obstruction the reach and clearances shall be as shown in Fig. 6(c).
4.3 Accessible Route
4.3.1° General all walks, halls, corridors, aisles, and other spaces that are part of an accessible route shall comply with 4.3. 4.3.2 Location
(see Fig44b) and (c)). Clear Noor or ground space for wheelchairs may be part of the knee space required under somme objects. 4.24.2 Relationship of Maneuvering Clearance to Wheelchal Spaces One full unobstructed side of the clear Moor a ground space for a wheelchair shall adjoin a overlap an accessible route or adjoin another wheelchair clew noor space. W a clear floor space is located in an alcove or otherwise confined on all or part of three sides, additional maneuvering clearances shall be provided as shown in Fig. 41d) and (e). 184.108.40.206 Surfaces for Wheelchair Space Clear floor or ground spaces for wheelchairs shall comply with 4.5. 4.2.5 Forward Reach. If the clear foor space only allows forward approach to an object the maximum high forward reach allowed shall be 48 in (1220 mm) (see Fig. 5(a)). The minimum low forward reach is 15 in 380 mm. N the high forward reach is over an obstruction, resch and clearances shall be as shown in Fig. 5(b). 4.2.6* Side Resch I the clear foor space allows parallel approach by a person in a whecichair, the madimum high side reach allowed shall be 54 in (1370 mm) and the low side reach shall be no less than 9 in (230 mm) above the floor (Fig 6(a) and (b)).
(1) At least one accessible route within the boundary of the site shall be provided from public transportation stops, accessible parking and accessible passenger loading ones, and public streets or sidewaltos to the accessible building entrance they sve.
(2) At least one accessible route shall connect accessible buildings, facilities, elements, and spaces that are on the name site.
(3) At least one accessible route shall connect accessible building or facility entances with all access ible spaces and elements and with all accessible dwelt ing units within the building or facility.
(4) An accessible route shall connect at least one accessible entrance of arch accessible dwelling unit with those exterior and interior spaces and facilities that serve the accessible dwelling unik