What Is Sunk Slab, How It Is Constructed, Its advantages And Disadvantages

Sunken Slab

sunken slabs are used in the toilets, bathrooms and washing area, it casted at a certain depth of (200 - 300mm depending on the design) below the normal floor level. The floor level of the sunk/ depressed slab is generally kept below the normal floor slab level so that water will not spill out over into the regular floor while washing etc. It can be provided in kitchens/utility portion also.

The purpose of having a sunken slab is to conceal all the pipes below the floor.

 Since the pipes that carry water are concealed below the floor, Hence extra care to be taken  while constructing a sunken slab; otherwise, dampness or water leakage may happen in the future.
This kind of construction require well trained or experienced workers to tackle all aspects very well by considering future visions related to the maintenance of those areas.

How Sunken Slab Constructed

• The concrete of the R.C.C. (floor and sunken slab) should mixed with a waterproofing material to get a denser, watertight concrete.
• Then cement and waterproofing material should be diluted in water and splashed onto the RCC sunken slab. Over that a layer of plaster should be provided using a mortar plasticizer with the cement mortar.
• Brick laying of walls and plastering (prior to tiling) of the walls and floor should be done with cement mortar mixed with a mortar plasticizer.
• Tile fixing for the floor and walls tiles should be done with non-shrink, waterproof tile adhesives to make the tiled area waterproof.
• Sanitary pipe joints should be sealed with sealants specially manufactured for Sealing Sanitary joints firmly so that no water can leak through

 

 

Advantages:

All plumbing pipes are concealed inside the slab

No Need special plumbing fixtures to reduce noise during usage of bathroom

Disadvantages:

The decrease in the height of the slab
Slab, waterproofing and brick bat takes more time to construct as compared to Sunken Slab
Need experience or skilled labor to construct

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