Page 143 - GRIHA Manual Volume IV - Introduction to National Rating System
P. 143
134 Griha Manual: Volume 4
Buildings
1. Ramps with gradients: Where ramps with gradients are necessary or desired, they shall conform to the following requirements
a. A ramp when provided should not have a slope greater than 1 in 20 or maximum of 1 in 12 for short distance up to 9000
mm.
b. A ramp shall have handrails on at least one side, and preferably two sides, that are 900 mm high, measured from the
surface of the ramp, that are smooth, and that extend 300 mm beyond the top and bottom of the ramp. Where major trafic
is predominantly children, the handrails should be placed 760 mm high.
c. A ramp shall have a surface that is non-slip surface and if length is 3500 mm, the minimum width shall be 1500 mm.
d. A ramp shall have a level platform at the top which is at least 1800 mm long, if a door swings out onto the platform or
towards the ramp. This platform shall extend at least 300 mm beyond each side of the doorway.
e. Each ramp shall have at least 1800 mm of straight clearance at the bottom.
f. Ramps shall have level platforms at 10 m to 12 m intervals for purposes of rest and safety, and shall have platforms of
minimum 1.5 m length wherever they turn.
g. For visually impaired people, ramps may be colour contrasted with landing.
h. To minimize rise to wheelchair users, ramps should be equipped with kurbs approximately 50 mm high at exposed sides.
2. Entrances
a. At least one primary entrance to each building shall be usable by individuals in wheelchairs and shall be indicated by a
sign.
b. At least one entrance usable by individuals in wheelchairs shall be on a level that would make the elevators accessible.
3. Door and doorways
a. Door width: To enable wheelchair users to pass through doors, the minimum
clear width should be 900 mm and shall be operable by a single effort.
b. Wheelchair maneuvering space: To enable wheelchair users to approach doors
maneuvering space is needed as shown in Figure 1. A corridor should have a
width of at least 1200 mm to allow a 90° turn to be made through a door. In
narrow spaces sliding doors may be preferable.
c. Thresholds: Raised thresholds should be avoided, but where this is not possible,
their height should not exceed 25 mm. Rubber thresholds are advantageous for
wheelchair users.
d. Door identiication: To help people with impaired sight to see doors, the door and
frame should be in a colour which contrasts with the adjoining wall.
e. Door handles: Door handles and locks should be easy to manipulate. To facilitate
the closing of a door by wheelchair users (for example, a water-closet Note: Depending on the free space beside
the opening side (450 or 550 mm), the
compartment), the door should have a horizontal handle approximately 800 mm depth of free space should be 1500 mm
from the loor. Self-closing doors should be equipped with an easy gripped or 1400 mm.
vertical pull-handle with a length of at least 300 mm, and with the lower end Figure 1 Maneuvering space
approximately 800 mm above loor. For many people and specially those with needed for wheelchair users to
impaired vision, it is helpful to notify whether doors are to be pulled or pushed. Approach doors
4. Windows
a. Windows should be designed to avoid glare which is especially a problem for
people with impaired vision.
b. Large glass areas close to circulation spaces should be marked a little below eye
-level with a coloured band or frame.
c. To enable wheelchair users to see through a window comfortably, the sill should
be not higher than 800 mm from the loor.
d. Windows should be easy to open and close. Their controls should be placed in
the zone 900–1200 mm from the loor. (See igure 2)
Figure 2 Position of sill and
window control
Buildings
1. Ramps with gradients: Where ramps with gradients are necessary or desired, they shall conform to the following requirements
a. A ramp when provided should not have a slope greater than 1 in 20 or maximum of 1 in 12 for short distance up to 9000
mm.
b. A ramp shall have handrails on at least one side, and preferably two sides, that are 900 mm high, measured from the
surface of the ramp, that are smooth, and that extend 300 mm beyond the top and bottom of the ramp. Where major trafic
is predominantly children, the handrails should be placed 760 mm high.
c. A ramp shall have a surface that is non-slip surface and if length is 3500 mm, the minimum width shall be 1500 mm.
d. A ramp shall have a level platform at the top which is at least 1800 mm long, if a door swings out onto the platform or
towards the ramp. This platform shall extend at least 300 mm beyond each side of the doorway.
e. Each ramp shall have at least 1800 mm of straight clearance at the bottom.
f. Ramps shall have level platforms at 10 m to 12 m intervals for purposes of rest and safety, and shall have platforms of
minimum 1.5 m length wherever they turn.
g. For visually impaired people, ramps may be colour contrasted with landing.
h. To minimize rise to wheelchair users, ramps should be equipped with kurbs approximately 50 mm high at exposed sides.
2. Entrances
a. At least one primary entrance to each building shall be usable by individuals in wheelchairs and shall be indicated by a
sign.
b. At least one entrance usable by individuals in wheelchairs shall be on a level that would make the elevators accessible.
3. Door and doorways
a. Door width: To enable wheelchair users to pass through doors, the minimum
clear width should be 900 mm and shall be operable by a single effort.
b. Wheelchair maneuvering space: To enable wheelchair users to approach doors
maneuvering space is needed as shown in Figure 1. A corridor should have a
width of at least 1200 mm to allow a 90° turn to be made through a door. In
narrow spaces sliding doors may be preferable.
c. Thresholds: Raised thresholds should be avoided, but where this is not possible,
their height should not exceed 25 mm. Rubber thresholds are advantageous for
wheelchair users.
d. Door identiication: To help people with impaired sight to see doors, the door and
frame should be in a colour which contrasts with the adjoining wall.
e. Door handles: Door handles and locks should be easy to manipulate. To facilitate
the closing of a door by wheelchair users (for example, a water-closet Note: Depending on the free space beside
the opening side (450 or 550 mm), the
compartment), the door should have a horizontal handle approximately 800 mm depth of free space should be 1500 mm
from the loor. Self-closing doors should be equipped with an easy gripped or 1400 mm.
vertical pull-handle with a length of at least 300 mm, and with the lower end Figure 1 Maneuvering space
approximately 800 mm above loor. For many people and specially those with needed for wheelchair users to
impaired vision, it is helpful to notify whether doors are to be pulled or pushed. Approach doors
4. Windows
a. Windows should be designed to avoid glare which is especially a problem for
people with impaired vision.
b. Large glass areas close to circulation spaces should be marked a little below eye
-level with a coloured band or frame.
c. To enable wheelchair users to see through a window comfortably, the sill should
be not higher than 800 mm from the loor.
d. Windows should be easy to open and close. Their controls should be placed in
the zone 900–1200 mm from the loor. (See igure 2)
Figure 2 Position of sill and
window control
