Modern wall coating with very high mechanical strength. Portland cement-based, seals masonry providing a rigid and waterproof barrier, ideal for plinths and demanding environments.
The alkali-resistant fibreglass mesh in the finish coat is essential: the strong hygrometric shrinkage of cement would cause plastic shrinkage cracking without surface reinforcement.
Introduced on a massive scale in 20th-century construction for its rapid setting and unequalled strength, cement render replaced lime as the standard coating for modern buildings, offering a rigid armour against impacts and weathering.
The mix is based on the use of Portland cement as the exclusive or predominant binder, combined with siliceous or calcareous sands and water-repellent additives. Unlike the slow carbonation of lime, cement hydration ensures rapid curing and compressive strengths (classes CS III or CS IV) that easily exceed 10 MPa. This makes it the ideal render for receiving heavy coverings bonded directly to its surface.
Cement's strength is also its architectural limit. The very high density of the matrix creates a barrier with low permeability to water vapour (high mu). While this is perfect for protecting plinths and basements from driving rain, it is lethal on historic masonry or porous brickwork: rising damp, blocked by the cement render, accumulates at the interface, causing hydraulic and saline stresses that lead to uncontrolled detachment of the finish.
European and international references applicable.
Cement plaster is not recommended on historical stone or solid-brick masonry: its low vapour permeability traps rising damp, generating hydraulic and salt stresses that cause plaster detachment.
Facade plinths in contact with pavement, resistant to water splashes and accidental impacts.
PRC.33 · Open the processInternal coating of cellars, garages and technical rooms where breathability is not required.
PRC.42 · Open the processIdeal bonding base for gluing ceramics, klinker tiles or reconstituted stone.
PRC.42 · Open the processCement block infill walls machine-plastered for high durability at low cost.
PRC.33 · Open the processThe Bastard Mortar was developed precisely to mitigate the extreme hardness of pure cement: adding a percentage of lime to the cement mix lowers the elastic modulus and improves on-site workability, while maintaining adequate resistance for modern construction.
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