Breathable
Lime plaster will
allow moisture to easily pass through whereas cement will trap and
prevent moisture from escaping, leading to a greater problem -
gradually building and then ultimately forcing the damp to come out
elsewhere.
Flexible
Whilst cement based
plasters and renders are strong in compressive strength they lack
greatly in flexibility. Any movement can easily result in the very
strong cement based plaster cracking and if used externally will
allow the ingress of water and damp. Then the damp will be trapped
behind a non breathable render.
So while lime is not as hard, it's more flexible, so suited
for use in an older buildings.
In this room the ceiling was plasterboarded and skimmed using normal plaster. All the walls were plastered using Traditional Lime Render and Lime Finish Plaster.
