The principal difference between plastering and rendering is very simple; plastering is done on interior surface areas whilst rendering is undertaken on exterior surfaces. More specifically, the key difference between plastering and rendering concerns the combination and materials to be used.
Composition of Material
The basic composition for both plaster and render is broadly quite similar – cement, sand, water and on occasion – lime. When rendering, a coarser, higher proportion of sand is the preferred choice. For plaster work finer sand would be used to ensure a smoother finish.
There exists are a wide variety of premixed renders which can be used on many different applications – some renders such as K Rend – have additives (polymers) which provide more enhanced water resistance and strength which is needed on exterior surfaces. Acrylic premixed renders offer a higher level of resistance to water as well as strength which again is important for exterior surfaces.
Modern day techniques and new skills int he plastering and rendering trade means that different types of finish can be achieved for both internal plastering and external rendering. Rendering will generally produce a coarser finish than interior plaster. Pebble dashing is also a type of rendering.