Finished Plaster

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes11 min read

What Is Finished Plaster?

After Successfully Raising walls, Plaster Finishing is done to decorate walls or cover their uneven surfaces to achieve a smooth and aesthetic finish.

Plastering is basically the process where the coarse surfaces of constructed walls or ceilings are covered with mortar finishes to achieve a smooth and elegant finish.

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Plaster Finishes

In this article, we will be discussing various types of plaster finishings and their properties.


Types of Plastering Finishes

Following are the 10 Types Finished Plaster,

  1. Pebble Dash Plaster Finish
  2. Scrapped Plaster Finish
  3. Textured Plaster Finish
  4. Stucco Plaster Finish
  5. Exposed Aggregate Plaster Finish
  6. Waterproof Plaster Finish
  7. Smooth Coat Finish
  8. Sand Faced Finish
  9. Rough Cast Finish or Spatter Dash Finish
  10. Depeter Finish

Read More: Vitrified Tiles – Pros & Cons of Vitrified Tiles


1. Pebble Dash Plaster Finish

It is a Plaster Finish in which small pebbles or crushed stones of suitable size (generally varying from 10 to 20 mm) are thrown onto a freshly applied final coat of mortar and left exposed.

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Pebble Dash Plaster

The mortar for the final coat is usually made by mixing cement and coarse sand in the mix proportion of 1:3 and is placed in about 1 mm thickness.

The pebbles used for dashing should be well washed and thrown wet onto the final coat. The pebbles may be tightly tapped into the mortar with a wooden float or with the flat of the trowel.

This finish of plaster possesses all the advantages of the roughcast finish and is recommended in similar conditions. Pebbledash plaster finish is mostly used for covering exterior walls and provide an aesthetic appearance to the structure.


2. Scrapped Plaster Finish

In many homes to create a good blend of smooth and rough surfaces, a scrapped plaster finish is created. It is a plaster in which the final coat, after being leveled and allowed to stiffen for a few hours, is scrapped with a steel straight edge old saw blade or other such tools to remove the surface skin.

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Scrapped Plaster Finish

Various types of scrapped finished can be obtained by using different types of tools in different manners.

In this type of plaster finish, the final layer is usually 6 to 12 mm thick of which about 3 mm is removed in the scrapping process. The scrapping is done after the setting of the final coat has taken place.

In the process of scrapping, the surface skin of the mortar is removed to expose aggregate and the texture obtained depends upon the grading aggregates used in the final coat. This type of plaster finish is less liable to crack than the plain finish.


3. Textured Plaster Finish

A textured plaster finish can be typically found on boundary walls or part of a feature wall to create a textured interior décor installation.

A textured plaster finish is created by making use of stucco plastering, finished with a rough surface but often smoothed over to create repetitive patterns.

For textured finish mix of sand, cement, lime, and water used blended with various additives such as fibers and synthetics acrylics, and even coloring pigments.

In this finish, ornamental finish or textured surfaces are produced by working with various tools on the freshly applied final coat. This type of finish possesses all the advantages of the rough finish.


4. Stucco Plaster Finish

Stucco plaster finish belongs to a type of plaster that provides a superior finish. This type of plaster can be applied for inside as well as outside surfaces.

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Stucco Plaster

It is usually placed in three coats which make the entire thickness of the plaster roughly 25mm.

The first coat is known as scratch coat; the second one is a finer coat of brown coat and the third is known as a white coat or finishing coat.


5. Exposed Aggregate Plaster Finish

White and colored marble chips shall be of 6 mm to 12 mm size shall be used which obtained from crushing hard marble stone.

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Exposed Aggregate Plaster Wall

Exposed aggregate finish plaster shall be 20 mm thick. The procedure of application shall be the same as for the sand-faced finish. Mix proportion should be 1 cement: 1 marble chip and the pebbles to be used shall be well washed and drained.

The admixture shall be thrown wet onto the undercoat while it is still plastic using a strong whipping motion at right angles to the face of the wall. Loose mortar on the top surface shall be cleaned or removed by washing / brushing with a water jet.


6. Waterproof Plaster Finish

Cement waterproof compound of approved make and manufacture shall be used for plastering. These compounds shall conform to IS:2645.

Use of admixture consists calcium chloride shall not be permitted. The material should be brought to the project site in its original packing.

The compound shall be well mixed with dry cement in the proportion of 3% by weight or as recommended by the manufacture.

Care shall be taken while mixing, to see that waterproofing material gets well and integrally mixed with cement and does not run out separately on the addition of water.

Read More: Construction Drawings | Types of Construction Drawing Used In Building Construction


7. Smooth Coat Finish

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Smooth Coat Finish

This type of plaster finishing is smooth in nature with leveled surface. The proportion of 1:3 is used for cement and fine sand for making mortar used in finishing.

The application of mortar to the wall is done using wooden float.


8. Sand Faced Finish

Application of Sand Faced Finish is done in two coats. The ratio of cement sand is kept 1:4 in mortar for the first layer with 12mm thickness.

Initially, the first layer is applied and then cured for seven days, which is followed by the second layer with a thickness of 8mm.

As per requirement, the ratio is kept at 1:1 for cement sand mix. Use of sponge is done after when the layer is wet to add the required characteristics.


9. Rough Cast Finish or Spatter Dash Finish

Rough Cast Finishing requires a Cement Sand Aggregate ratio of 1:1:3 for finishing work, having a coarse aggregate size of 3mm to 12 mm.

Mortar is applied by throwing it on the prepared plaster surface and then the surface is roughly finished using wooden float. Rough Cast Finish possesses the properties of being waterproof, durable, and resistant to cracking and crazing.


10. Depeter Finish

Depeter Finish is a kind of final finish coat of plaster and has a thickness of around 12mm to ensure effectiveness.

After mortar application, the pieces of gravel flint are pressed as per requirement directly with hands on the surface. Gravel plinth could be used in different colors and shapes to give a colorful appearance to the wall.


Wall Plaster Material

To meet some specific requirements of finished surfaces such as durability, better appearance, fireproofing property, heat insulation, etc. special materials are mixed with mortar.

The followings are the wall plastering materials,

  1. Acoustic Plaster
  2. Asbestos Marble Plaster
  3. Barium Plaster
  4. Granite Silicone Plaster
  5. Plaster of Paris or Gypsum Plaster
  6. Keene’s Cement Plaster

1. Acoustic Plaster

Special materials such as gypsum are added in mortar mix for finishing coat such as coat undergoes a chemical reaction and produces gas bubbles and due to the bubbles tiny openings are assembled in the coat and it appears like a honeycomb.

These fine honeycomb openings absorb sound. Thus, such plaster is preferable and useful in interior walls of auditorium halls.


2. Asbestos Marble Plaster

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Asbestos Marble Paster

For a better surfacing of finishing coat, mortar is made with the asbestos cement & finely crushed marble and applied as a finishing coat.


3. Barium Plaster

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Barium Plaster

To safeguard the persons operating in X-ray rooms from radioactivity, a finishing coat is applied with mortar made of cement, sand, and barium soleplate.


4. Granite Silicone Plaster

It is a plaster finish achieved by mixing granite and silicon with mortar. This type of plaster finish is utilized for a superior type of construction.

It is anelastic in nature and quick in the setting. This plaster eliminates cracks on the surface


5. Plaster of Paris or Gypsum Plaster

What Is Finishes Plaster | 10 Types of Plastering Finishes | Exterior & Interior Plaster Finishes
Plaster Of Paris

Gypsum is heated at 160° to 170° C to obtain plaster of Paris. The plaster of Paris solidifies with 3 to 4 minutes after adding water.

Suitable retarders are mixed with mortar to increase its setting time. Plaster of Paris is generally used in combination with lime for ornamental work and repairing cracks.

Gypsum plaster has fire resistance, lightweight. It does not shrink while setting. It has a sound-insulating property.

Read More: What is Gypsum Plaster- Types, Use, Pros & Cons


6. Keene’s Cement Plaster

Keene’s cement plaster is obtained by calculation of plaster of Paris with alum.

This is very stiff and hardens in a few days taking a white glass-like polish. It is useful for decorative work.


FAQs

What Is Plaster?

Plaster can be defined as a building material used for protective or decorative purposes for wall coating and ceilings. Plaster wall finishes have the ability to last longer than ordinary paint jobs or wallpapers.

What is Rough Cast Plaster?

Rough Cast Plaster is also known as Spatter Dash Plaster requires a Cement Sand Aggregate ratio of 1:1:3 for finishing work, having a coarse aggregate size of 3 mm to 12 mm.
In it, Mortar is applied by throwing it on the prepared plaster surface, and then the surface is roughly finished using wooden float. Rough Cast Finish possesses the properties of being waterproof, durable, and resistant to cracking and crazing.

Finished Plaster

Finish Plaster can be explained as the mill-mixed gauging (lime) plaster that requires only a specific amount of water to achieve high quality with easy troweling characteristics. It has been designed for the finishing of conventional and veneer plaster interior surfaces.

Types of Plaster Wall Finishes

Different Types of Plaster Finishings are listed below,
1. Pebble Dash Plaster Finish
2. Scrapped Plaster Finish
3. Textured Plaster Finish
4. Stucco Plaster Finish
5. Exposed Aggregate Plaster Finish
6. Waterproof Plaster Finish
7. Smooth Coat Finish
8. Sand Faced Finish
9. Rough Cast Finish or Spatter Dash Finish
 10. Depeter Finish

Types of Plaster?

Various Plastering types are,
1. Acoustic Plaster
2. Asbestos Marble Plaster
3. Barium Plaster
4. Granite Silicone Plaster
5. Plaster of Paris or Gypsum Plaster
6. Keene’s  Cement Plaster

Rough Plaster

Rough Cast Plaster is done by mixing cement, sand, and gravel in a specific proportion and is applied over a freshly plastered surface. The first coat of plaster consists of a 12 mm thick layer and a top layer with thickness of 12 mm in a cement mortar ratio 1:3.

Wall Plastering Materials

The following are various wall plaster materials,
1. Acoustic Plaster
2. Asbestos Marble Plaster
3. Barium Plaster
4. Granite Silicone Plaster
5. Plaster of Paris or Gypsum Plaster
6. Keene’s  Cement Plaster

Types of Plaster Finishes for Walls

The following are different wall plaster finishes,
1. Pebble Dash Plaster Finish
2. Scrapped Plaster Finish
3. Textured Plaster Finish
4. Stucco Plaster Finish
5. Exposed Aggregate Plaster Finish
6. Waterproof Plaster Finish
7. Smooth Coat Finish
8. Sand Faced Finish
9. Rough Cast Finish or Spatter Dash Finish
 10. Depeter Finish


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