Today we’re discussing traditional render finishes. Stucco, a terms used widely across North America, has its origins in Germany and Italy. For centuries cathedrals, churches and houses were rendered using mortar and lime finishes and although Stucco as a term is now used to describe all sorts of render, it is widely believed to have originated here.
This render uses lime as a filler. The advantages of lime are that it’s flexible and breathable making it ideally suited to buildings that experience movement.
Lime render is typically used on older buildings to retain the original characteristics of the property. It is particularly effective at removing moisture from porous stone or rubble by acting as a conduit for the water, which evaporates on the external surface.
Properties that have had lime render replaced with a cement render often experience damp as a result of the loss of the lime render.
There are a variety of ways that Lime render can be applied and these will be determined in part by the substrate and in part by the finish required.
Lime render is incredibly versatile, making it an all-rounder on a range of substrates. However, it is a lot more expensive than other methods.
Sand and Cement Renders
Sand and cement renders are made using Portland Cement making them incredibly hard and strong. However, this stiffness also leads to cracking.
Although certain additives can be added to provide some level of flexibility, the main application for sand and cement renders are for walls not exposed to driving wind and rain, and those that do not exceed ground level.
Sand and cement renders aren’t waterproof so are typically finished with an external paint to provide it with some protection.
The main advantage of sand and cement renders is that it is very cheap. For the right application, the money and time saved is very worthwhile.