CurlingMan13
To answer the question, sometimes the crosswalk is brick, but the road is asphalt.  Or the crosswalk is concrete, and the road is asphalt.  Not super common, but I do see it regularly.

In this case, it would be asphalt.

Keep up the good work with StreetComplete!  (I remember adding these to the map. lol).  Hopefully I was able to provide some insight.