Room Polyline Defaults?

[ACADuser]

The room area polyline comes with a hatch automatically, can you set the room area polyline to have one too?

I'm using the CAD layer to set the layer but I wish i could force a 12x12 grid hatch.

[ACADuser]

I have 67 rooms in this building.
What I did was set the CAD layer to Ceiling Grid Layer.
Select one room, then use Match properties to get all rooms selected.

Make a room polyline,
While all still selected set fill to grid.
This was very quick.