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DDA Handrails: Top, Middle and Bottom Rail Diagram
Top, middle & bottom rail DDA diagram
This diagram illustrates building a DDA handrail that has a top, middle and bottom rail. A bottom rail is required when there is no curb on a ramp. Please investigate the drawing below to learn how the different fittings for each assembly go together.
A) Standard Upright: The 62-8 base flange is for mounting to level surfaces. The 518-7 connects to 10-848 and 10-840C fitting.
B) Ramp upright: The 67-8 base flange is for mounting to angled surfaces. The angle is fixed by tightening the set screws. The railings are attached in the same manner as the Standard Upright. The bottom rails are connected with 89-8 on mids and 86-8 on ends.
C) Wall mount: The 570-7 is connected to the wall or wood posts using 1/4" screws or bolts. The 570-7 is attached to the railing with No. 12 self-drilling screws or pop rivets.
D) D Returns: D returns are constructed with 520-7s and 514-7. The 520-7s are connected vertically with a small piece of pipe. This assembly is then joined to the top and midrail with 514-7s.
E) Adjustable angles: In order to accomplish angles with a smooth surface, use the 554-7 and 514-7s. These are frequently used at the top and bottom of ramps and stairs.
F) Wall returns: The 565-7 wall return flange is connected to the wall and then connected to the pipe with a 514-7.
