In the construction world, every material plays an important role. Mortar is a basic material that is widely used in masonry and finishing works. There are so many types of mortars used in the construction industry. But commonly used mortars are Jointing mortar & Plastering mortar - they may look similar, but they serve different purposes in the construction process. Let us understand the difference between Jointing mortar and Plastering Mortar through this blog.
Jointing mortar is mainly used to bond masonry units together - be it AAC Blocks, traditional bricks, or cement bricks. It is a structural adhesive that ensures a solid and stable connection between the building units.
The main goal is to bond the bricks or blocks together tightly to create a strong and unified wall structure.
It is applied in a thin layer, usually 3 to 5 mm thick, across the joints in masonry units.
Usually made from a combination of cement, graded fine sand, polymers, and additives. These ingredients help with better workability, water retention, and bonding strength.
Jointing mortar is formulated to have high tensile and compressive strength, so it is suitable for load-bearing walls.
There are various ready-mix varieties present in the market that are specifically designed for specific types of blocks, primarily AAC blocks, which are easy to handle and rapid setting.
Plastering mortar is a final finishing product material used to cover and protect masonry surfaces. The mortar provides a smooth, level surface, an even base for paint, texture, or other wall finishes, as well as protection against external conditions like moisture and dust.
It is used to provide a smooth and hard surface finish on both interior and exterior walls and ceilings.
It will be used in applying thicker layers than jointing mortar, generally between 6 mm to 20 mm, depending on the wall surface and finish needed.
Usually, it’s a mixture of cement (or lime), sand, and water. In some cases, Bonding agents and waterproofing agents can be added according to the application to improve performance.
It finishes off the surface, even, smooth, and ready for painting or papering. It also covers up defects in blockwork or brickwork.
It will act as a barrier to moisture, thereby improving the durability and appealing of the structure.
| Feature | Jointing Mortar | Plastering Mortar |
|---|---|---|
| Primary Function | Binds masonry units like bricks or blocks | Provides a smooth, protective surface finish |
| Application Area | Between individual blocks or bricks | Over the wall and ceiling surfaces |
| Layer Thickness | 3–5 mm | 6–20 mm |
| Composition | Cement, fine sand, polymers, and additives | Cement/lime, fine sand, water, optional additives |
| Strength | High compressive and bonding strength | Moderate strength for finishing, not structural |
| Finish Quality | Not meant for an aesthetic finish | Smooth, paint-ready surface |
Using the wrong kind of mortar can reduce the structural integrity and aesthetic value of a construction. Consider, If you are using a plastering mortar in place of jointing mortar could lead to weak bonding between blocks, resulting in cracks or failure over time. Applying jointing mortar as a plaster can create an uneven surface and reduce adhesion for paint or tiles.
By selecting the correct mortar based on its intended use, builders can ensure:
Jointing Mortars and Plastering Mortars are considered to be in the category of Masonry Mortars, but their function, composition, and applications are very different. Jointing Mortar plays a structural role, with efficiency of durability and alignment of masonry units. Plastering mortar is all about aesthetics, a smooth look, and surface protection
In the construction world, with materials like AAC blocks, choosing the right mortar isn’t just a matter of preference - it’s a necessity. By understanding the differences, you can ensure that every stage of your project is executed with the right tools and techniques. Reach out to us for More Info.
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