In the plastering of surfaces with three coats, the second coat of plaster applied is also known as _____.

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  1. under coat
  2. rendering coat
  3. setting coat
  4. floating coat

Answer (Detailed Solution Below)

Option 4 : floating coat
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Explanation:

  • Definition: The floating coat is the second coat of plaster applied during a three-coat plastering process.
  • Purpose: Its primary function is to level the surface and provide a smooth base for the final finishing coat.

  • Process: This coat is applied after the undercoat and is usually a bit more textured to help the final coat adhere properly. It is often smoothed out with a trowel, but it is not as fine as the finishing coat.

 Additional Information

Under Coat

  • Definition: The undercoat is the first coat of plaster applied directly to the wall surface.

  • Purpose: It provides a rough base for the subsequent coats and is usually thicker than the other coats.

  • Details: It is not typically smooth, and it helps bond the plaster to the wall surface.

Rendering Coat

  • Definition: The rendering coat is often used for external surfaces or rough walls that require a thick plastering layer.

  • Purpose: It serves to seal and smooth the surface before additional finishing. This coat can be considered a form of undercoat or base coat.

  • Details: It is a more general term for a plastering layer applied to rough surfaces, typically on the exterior.

Setting Coat

  • Definition: The setting coat is the third coat of plaster applied as the finishing coat.

  • Purpose: Its function is to create a smooth and fine finish.

  • Details: This is usually a finer mix and is used to ensure the plaster is smooth and even. It is applied after the floating coat to achieve a polished surface.

 

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