Roughcast
/ˈrʌfkæst/
Definition 1 of 2
Pro Tip 1/3Construction Term
Used mainly in building and architecture contexts to describe external wall textures. 
The architect specified roughcast for the building's facade.
Pro Tip 2/3Visual Texture
Roughcast suggests a visually and tactilely uneven, pebbly surface, not smooth. 
The roughcast texture on the cottage gave it a traditional appearance.
Pro Tip 3/3Rustic Implication
This term often conveys a rustic or less refined finish compared to smooth plaster. 
They preferred the charm of a roughcast finish to modern, sleek materials.