HomeMy WebLinkAboutX2020-1779 - Alternative Material & MethodsD
y
m
m 3
0
m �D
m
z mD
C99O
W
M G
o in
_N 0 z
\�\ o n
m 1
(( 11z
!1 ? O
3 co
o z
z
mcu
W
oN
OO
m0 o
N D
m �
m m
a
ar
-. pl
N
m
m
N �
OT m N
m N
3 n
n S.
W N N O ❑ ® ❑
tom a n N s G1TY O
v c a o n o m
o � 3 � o N 8 m om n � m � O' m Offm mAm mT,im uy76
d a cs m m a m aimc Amc A=1cFn�t<
m o A§ w P& N m y a �. AN N <=N < mm y
N a D g o -i o s 9 0 m m Do.1 30-� ymto-� y
' 3 0 5' 5' m M ^ v -Zi m O 00 T O FT\^. ,•°�' Y
O a (n m m tD m N m = A o0� o O A
c J 5 ID -i r O A ..NJV� `
a ° �• z �. v o o :n y �Q to m O m Do D Do A m i �'= .� G,.�a �°
N -n 3 m� ° 3 m N coo 'm mn 0-1 y-In0
d Z �' .'o ' j3 y z m'mG9
v NZ �C o f1 -�—i AD - Co—l7 �
3 p N N < 0 a O DC 1 a2O 1 n \1
3 °_ 8 to u 9 =^ 'm N n, N v r m a i m 3 0
O a Co d G `� ... m O� 0 3 O C—Z l 1
S' 8 m rn a y AO .<m—Z1 °<—' nm O O m ~
C a JD N — a a a 0 A m 6
03
is _ N
g < °' � ^o O' N r a r
< 0 < z 0
W 09 W O< y O
e o 0TmmZN .. m���
Ln. o fi $ s m Ro n �' E» 0 p ley yZ�
w CD
v q m s>Z r
ND ow
O a ? Tm OT O Wd b V
a
RR A a ❑❑❑COD 9.
!n a 0.� 0 o D J —Z� O
o R 3 8 o' 3m a m m ?1'00 � m Q`CD 0 cn ca
m tioo =�
CD 5' Co 3` a °: c. 0- 'o o
s o N �m y m -� o CD C w �y SniC 0)
u NSJ J O_ z d �.. K) "�y0 lsJ
O N w h
n o. '� g 2. o D o V', o n y d 8 w 0 4 m$ `O n o d O 1 ` J i� co l 1 %
ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMMODATIONS, COMMERCIAL BUILDINGS AND PUBLIC HOUSING
of 0.9 inch (22.9 mm) minimum and 0.92 inch (23.4
mm) maximum, a top diameter of 0.45 inch (11.4 mm)
minimum and 0.47 inch (11.9 mm) maximum, and a
height of 0.2 inch (5.1 mm).
11B-705.1.1.2 Dome spacing. Truncated domes in a
detectable warning surface shall have a center -to -center
spacing of 2.3 inches (58 mm) minimum and 2.4 inches
(6 t mm) maximum, and a base -to -base spacing of 0.65
inch (16.5 mm) minimum, measured between the most
adjacent domes on a square grid.
Exception: Where installed in a radial pattern, trun-
cated domes shall have a center -to -center spacing of
1.6 inches (41 mm) minimum to 2.4 inches (61 mm)
maximum.
top dameter of
045-047
11.4 mm-11.9mm
base tliameier of
09-092
229mm-234mm 0.2
(a) 5.1 mm
elevation
(enlargad)
2.3-2.4
57161
0.65 min2.3-2.4
16.5 O € 58-61
0 04
0 0 0 0
N)
plan
FIGURE 11B-705.1
SIZE AND SPACING OF TRUNCATED DOMES
11,B;705;1.1.3 C616rand contraef Detectable wanting
surfaces at transit boarding platform edges, bus stops,
hazardous vehicular areas, reflecting pools, and track
crossings shall comply with Section 1113-705.1.1:3.1.
Detectable warnings at other locations shall comply
with either Section IIB -705.1.1.3.1 or Section 1111-
705.1.1.3.2. The material used to provide visual con-
trast shall be an integral part of the surface.
IIB -705.1.1.3.1 Detectable warning surfaces shall
be yellow and approximate FS 33538 of Federal
Standard 595C.
1'2', Detectable warning surfaces shall
provide a70 -percent minimum visual contrast with
adjacent walking surfaces. Contrast in percent shall
be determined by:
Contrast percent= [(BI-B2)vVl ] x 100 where
B1 = light reflectance value (LRV) of the lighter
area and
B2 = light reflectance value (LRV) of the darker area.
Exception: Where the detectable warning sur-
face does not provide a 70 percent minimum can-
trast with adjacent walking suffaces, a 1 -inch (25
mm) wide minimum visually contrasting surface
shall separate the detectable warning from adja-
cent walking surfaces. The visually contrasting
surface shall contrast with both the detectable
warning and adjacent walking surfaces either
light -on -dark, or dark -on -light.
IIB -705.1.1.4 Resiliency. Detectable warning suffaces
shall differ from adjoining surfaces in resiliency or
sound -on -cane contact.
Exception: Detectable warning surfaces at curb
ramps, islands or cut -through medians shall not be
required to comply with Section IIB -705.1.1.4.
11B-705.1.2 Locations. Detectable warnings at the fol-
lowing locations shall comply with Section IIB -705.1.
JIB -705.1.2.1 Platform edges. Detectable warning
surfaces at platform boarding edges shall be 24 inches
(610 mm) wide and shall extend the full length of the
public use areas of the platform.
IIB -705.1.2.2 Curb ramps. Detectable warnings at
curb ramps shall extend 36 inches (914 mm) in the
direction of travel. Detectable warnings shall extend
the fedl width of the ramp rem less 2 inches (51 mm)
maximum on each side, excluding any flared sides.
Detectable warnings shall be located so the edge near-
est the curb is 6 inches (152 mm) minimum and 8
inches (203 mm) maximum from the line at the face of
the curb marking the transition between the curb and
the gutter, street or highway.
Exception: On parallel curb ramps, detectable
warnings shall be placed on the turning space at the
flush transition between the street and sidewalk.
Detectable warnings shall extend the full width of
the turning space at the flush transition between the
street and the sidewalk less 2 inches (51 mm) maxi-
mum on each side.
11B-705.1.2.3 Islands or cut -through medians. Detect-
able warnings at pedestrian islands or cut -through medi-
ans shall be 36 inches (914 mm) minimum in depth
extending the full width of the pedestrian path or cut -
through less 2 inches (51 min) maximum on each side,
placed at the edges of the pedestrian island or cut -through
median, and shall be separated by 24 inches (610 mm)
minimum of walking surface without detectable warnings.
Exception: Detectable warnings shall be 24 inches
(610 mm) minimum in depth at pedestrian islands or
cut -through medians that are less than 96 inches (2438
mm) in length in the direction of pedestrian travel.
IIB -705.1.2.4 Bus stops. When detectable warnings
are provided at bets stop boarding and alighting areas,
the detectable warnings shall extend the full width of
the boarding/alighting area and shall be 36 inches (914
mm) minimum in depth.
IIB -705.1.2.5 Hazardous vehicular areas. Detectable
warnings at hazardous vehicular areas shall be 36
inches (914 mm) in width.
IIB -705.1.2.6 Reflecting pools. When detectable
warnings are provided at reflecting pools, it shall be 24
2016 CALIFORNIA BUILDING CODE SUPPLEMENT—BLUE 601
EFFECTIVE JULY 1, 2D18
COLOR CONTRAST
CALCULATOR
HOME COLOR CONTRAST CALCULATOR
According to the ADAAG, the color and contrast of detectable warning materials must adhere to the following rule: 705.1.3 Contrast- Detectable Warning
Surfaces shall contrast visually with adjacent walking surfaces either light -on -dark, or dark -on -light.
This tool helps in establishing light -on -dark Or dark -on -light contrast differences, allowing the selection of a detectable ADA Tile color and a surrounding
concrete color while displaying a percentage of contrast based on the LRV scale. This percentage of contrast can assist the governing body in developing
the level of contrast that best meets the needs of the community.
What is LRV? Light Reflectance Value (LRV) is a universal value for'contrast'. It measures the proportion of useful light reflected by a colored object. It
represents a relative light and darkness value rather than an actual color, meaning dissimilar colors could have the same LRV. LRV is measured on a scale
of 0 to 100, 0 being an all absorbing black and 100 being an all reflecting white. Concrete
Color# LRV#
ADA Tile Color
Natural Colors
Federal Colors
Example
Using an LRV of 65 for concrete color 3(81), and the LRV
of 3 for the charcoal truncated domes (B2), contrast percent
is calculated as follows;
Concrete Color
ADA Tile Color
- Charcoal
Concrete Color
C°ncrc-t?3
Contrast percent = [(B1-B2)/B1] x 100
= [(65-3)/65] x 100 = 95
1
2
3
4
5
6
7
8
9
10
11
12
13