Making and weathering a rolled roof

I had a small shed that I am building and decided to use it as a coal storage shed for the sand house. I’d like to show how I did the roof which is quick and simple. 

before the roof
 

Using masking tape for the roofing material 


Placing the tape from the bottom up and then a ridge cap on top. 
 

I paint the masking tape black.
  

Then using a lighter shade of black I paint tar lines on the seams. 
 

Last step is using weathering powders. For this I used White Ash, Sand, and Soot colored powders. 
 

finished product will look something like this. Now to work on the shed doors!!!!!