Closing external Gap between fibre wall & slab

We have compressed fiber sheet walls around a timber frame in our enclosed patio. there are small gaps between the outer wall's fibre sheet and where it joins the slab underneath
what is the best way to cover this gap?

1) Should I just fill it with sikaflex?

2) or can I add concrete around the area (extending around 1 feet from the wall across the structure) and make it slop away from the walls
not sure If I can concrete against the fibre sheet, I am thinking to cover the fibre wall approx 1inch high in concrete/cement (which will close the gap) and slope away



here is a picture
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