CSA B651-12 pdf free download

CSA B651-12 pdf free download.Accessible design for the built environment.
5.3.1 Handrail grip
Handrails shall
(a) resist a force of at least 1.3 kN applied in any direction;
(b) have a graspable cross-section that is either
(i) circular with an outside diameter of 30 to 40 mm (see Figure 23); or
(ii) elliptical with an outside perimeter between 100 and 125 mm, with the largest cross-sectional dimension not more than 45 mm (see Figure 23);
(c) be free of any sharp or abrasive elements;
(d) have a continuous gripping surface, without interruption by newel posts or other construction elements or obstructions that interrupt a hand hold;
(e) have a clear space between the handrail and the wall, and underneath the handrail, as follows:
(i) between 35 and 45 mm wide for a smooth wall surface; and
(ii) between 45 and 60 mm wide for a rough wall surface; and (f) be colour-contrasted with the surrounding wall surface.
Commentary:
(1) Handrails are important features. They should be graspable and provide a firm and comfortable grip for the hand to slide along the rail without obstruction.
(2) A circular section with a diameter not more than 40 mm is the preferred shape so that the thumb and fingers can lock around the handrail. Wide or deep handrails that allow only a pinched grip should not be used unless a proper hand-size grasping area is provided (see Figure 24).
(3) The maximum clearance allowed between the rail and
wall is to provide for adequate gripping room, but also prevents injuries to arms slipping through the opening.
(4) The handrail and clearance should not protrude more than 100 mm from the wall.
5.3.2 Recessed handrail
A recess containing a handrail shall extend at least 450 mm above the top of the rail (see Figure 25).
5.4.3 Tactile attention indicator surfaces at stairs
5.4.3.1 General
A tactile attention indicator surface shall
(a) comply with Clauses 4.3.5.2 and 4.3.5.3;
(b) be located at the top of stairs;
(c) extend the full width of the stairs; and
(d) have a length between 600 and 650 mm, commencing one tread depth from the edge of the stair [see Figures 5(b) and 26(b)].
Commentary:
(1) A tactile attention indicator surface that is detectable underfoot or by a long white cane is necessary to caution people that they are approaching the onset of descending stairs.
(2) See Clause 3 for the definition of a tactile walking surface.
5.4.3.2 Location
A tactile attention indicator surface shall be provided
(a) at stairs that are not enclosed;
(b) at each landing incorporating an entrance into a stair system;
(c) where the regular stairway pattern is broken; and
(d) where the run of a landing with no continuous handrail is greater than 2100 mm.CSA B651-12 pdf free download.