What You Specify Affects More Than the Barrier
Barrier systems specified late create predictable coordination issues. Anchors land near control joints. Field adjustments get made. The floor system is compromised before it's under load.
The problem isn't usually visible at handover. It shows up 12 to 18 months in, as cracked concrete around anchor points, loosening fixings, and repeated repairs in the same traffic zones.
The material you specify determines whether impact energy is absorbed by the barrier or transferred into the slab below. That decision is made at the design stage, not after installation