Civil war Day 14 Oct 8 LSGD plastering and pointing

Front

A type of defect which forms a conical hole on the plastered surface is termed as

Back

Popping

Answer explanation

Popping occurs due to unsound materials like lime particles expanding and forming conical holes in plaster.

Front

Product of high grade gypsum which sets rapidly and produces excellent finish

Back

Thistle hardwall

Answer explanation

Thistle HardWall gypsum plaster: it is a quick-drying undercoat plaster, used for internal walls, with setting time about 2 hours.

Front

What is used to press mortar and spread it uniformly?

Back

Floats

Answer explanation

Floats are used to press and spread mortar evenly, ensuring a uniform plaster surface.

Front

When pearl ash is calcined with Plaster of Paris, ______ is obtained.

Back

Martin's cement plaster

Answer explanation

when pearl ash is calcined with Plaster of Paris, Martin’s Cement (or Martin’s plaster) is obtained.

Front

What is the purpose of the lath in plastering?

Back

To prevent cracks in the plastered surface.

Answer explanation

Lath provides a mechanical bond and prevents cracking in plaster surfaces.

Front

______________ surface is prepared when it is desired to give acoustical treatment to the hall or room.

Back

Acoustic Plaster

Answer explanation

Acoustic plaster uses porous materials to absorb sound and improve room acoustics.

Front

In plastering, the 1st coat is called ___________ and its thickness should be _______ mm.

Back

Rendering coat, 10-15 mm

Answer explanation

The rendering coat, the first plaster layer, is 10–15 mm thick and provides the base for later coats.

Front

Before plastering, the surface has to be

Back

Rough

Answer explanation

A rough surface ensures good adhesion of plaster to the wall background.

Front

What is the minimum thickness of load-bearing walls?

Back

200 mm

Answer explanation

Load-bearing walls must be at least 200 mm thick to ensure structural stability.

Front

In a lime-cement plaster, ratio 1:1:6 corresponds to:

Back

Cement:Lime:sand

Answer explanation

A 1:1:6 lime-cement plaster mix means 1 part cement, 1 part lime, and 6 parts sand for balanced strength and workability.