From the 2006 IRC.
- Table R301.5
- - MINIMUM UNIFORMLY DISTRIBUTED LIVE LOADS (in pounds per square foot)
- - - USE -Guardrails and handrails(d) . . . . . . LIVE LOAD - 200(i)
- - - USE - Guardrail in-fill components(f) . . . . LIVE LOAD - 50(i)

d. A single concentrated load applied in any direction at any point along the top.
f. Guard in-fill components (all those except the handrail), balusters and panel fillers shall be designed to withstand a horizontally applied normal load of 50 pounds on an area equal to 1 square foot. This load need not be assumed to act concurrently with any other live load requirement.
i. Glazing used in handrail assemblies and guards shall be designed with a safety factor of 4. The safety factor shall be applied to each of the concentrated loads applied to the top of the rail, and to the load on the in-fill components. These loads shall be determined independent of one another, and loads are assumed not to occur with any other live load.

I suspect those brads would not suffice.

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Jerry Peck, Construction / Litigation Consultant
Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )