A variety of gripping shapes may be acceptable but must meet requirements for the gripping surface. The handgrips must allow a minimum of 1-1/2” space between the handrail and the guardrail or wall. Handrail ends must be returned and terminated at rail posts. The top edge of the handrail must be placed between 34” and 38” above the nosing of the stair treads. Handrails are required for stairs in many applications and must meet standards as specified by R311.5.6.3 in the IRC code.
The sweep space between the deck surface and the bottom rail must be less than 4".
To achieve this, you should check to make sure you meet the post spacing requirements for the type of posts you are using and how they are attached to the deck. There is also a safety factor required by the code, so testing loads are higher for manufactured railing systems. force anywhere along the top of the rail. The guardrails must be strong enough to withstand a concentrated 200 lb. In the case of guardrails for stairs, there is an exception that allows up to a 6” diameter sphere through the triangle opening formed by the stair riser, stairtread and bottom rail. A variety of styles are allowed as long as the interior sections of the rail don’t possess any openings large enough to pass a 4” diameter sphere through.
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