Blue board is a heavy-duty 7.5 mm sheet that is mostly used for external wall cladding for residential properties that are being renovated or extended. It’s designed to be rendered with an acrylic-based render that’s applied in thin coats, giving the property a beautiful rendered appearance without requiring any masonry work. Blue board is made from the same type of material as dry wall, although the paper that’s applied to it is different. As the name suggests, the paper that’s applied before blue board rendering is blue. Blue board rendering is a preferred choice of builders, as this material is lightweight, quick to install, easily accessible and provides a smooth finish or textured coloured render finish.