Name of old underfelting ??

[smashngrab]

Anyone remember the name of an old felting. It was like paper to look at with string strengthening. Did it Begin with a C or S ? It was very thin.


Just been looking at whats left of some on a old ex council house.

 

[SurreyRoofingEstimator]

Sisalcraft building paper if I recall correctly, seem to have a ref 420 in my mind for some reason, I know it came in various grades (must be about 15 years since I last came across it)