Plastering is a crucial step in construction that enhances the durability and aesthetics of walls. Using the correct grey cement and achieving the correct plaster ratio ensures a smooth, strong, and long-lasting finish. Whether operating on interior or exterior walls, mastering the plastering process can significantly impact the quality of your structure. 

This guide will discuss the importance of grey cement, the ideal plaster ratio, and essential plastering tips for a flawless finish. 

Why grey cement is ideal for plastering? 

Grey cement is widely used for plastering because of its superior bonding strength, durability, and affordability. It provides a uniform surface, making it ideal for both painting and tiling. Additionally, it enhances resistance against moisture and cracks, ensuring long-term stability. 

The ideal plaster ratio for different applications 

The right plaster ratio varies based on the type of surface and the desired finish. Here are some common plaster mix ratios: 

Internal Wall Plastering 

Ratio: 1:6 (1 part cement, six parts sand) 

Thickness: 12–15mm 

Purpose: Provides a smooth and even surface for painting or wallpapering. 

External wall plastering 

Ratio: 1:4 (1 part cement, four parts sand) 

Thickness: 15–20mm 

Purpose: Enhances weather resistance and protects walls from rain and heat. 

Ceiling plastering 

Ratio: 1:4 (1 part cement, four parts sand) 

Thickness: 6–8mm 

Purpose: Creates a seamless and lightweight surface for false ceilings or direct painting. 

Rough plastering (for Brickwork) 

Ratio: 1:5 (1 part cement, five parts sand) 

Thickness: 15mm 

Purpose: Used as a base coat before applying a smooth finish layer. 

Waterproof plastering 

Ratio: 1:3 (1 part cement, three parts sand) + Waterproofing additives 

Thickness: 12–15mm 

Purpose: Provides additional moisture resistance, ideal for bathrooms and basements. 

Step-by-step guide to perfect plastering 

Surface preparation 

Clean the wall to remove dust, grease, and loose particles. Dampen the surface to prevent water absorption from the plaster mix. 

Mixing the plaster 

Use grey cementv with fine sand in the correct plaster ratio. Add water gradually to achieve a smooth, lump-free consistency. Mix thoroughly to ensure uniformity. 

Application of plaster 

Apply the first coat using a trowel, pressing firmly for proper adhesion. Level the surface using a straight edge or wooden float. For a smoother finish, apply a second thin coat after the first one dries. 

Curing the plastered surface 

Keep the plaster damp for at least seven days to prevent cracks. Lightly spray water 2-3 times a day to ensure proper curing. 

These were some steps and the guide to perfect plastering. 

Conclusion 

Achieving a flawless plastering finish requires using high-quality grey cement and the right plaster ratio for different applications. Proper preparation, application, and curing are key to strong, durable, and aesthetically pleasing walls. By following these steps, you can enhance the longevity and beauty of your construction project.