So last we saw this building, it was getting the thatch treatment.  I got to the top of the roof and decided to once again try using the Black Lava texture.  As you can see below when its put down it has this white pasty look when put down initially.
 Side look of the building.
 I also found this GW building in my closet, thought it would be a good time to put the kit together.  The pic below shows the cured black lava where you just see the black specs.  You can supplement that texture with a bit of ballast or sand, which the lighter granular material you see.
Below is the fresh black lava with the ballast.
Below is the cured black lava and ballast.
 And while I was at it, some goats for my terrain.
I am looking for some oxen and cows in 25-28mm scale.....