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Technical Details
The design is the same as that of a pit latrine, consisting of a superstructure, pit cover slab and a hole for defecation. In addition to this it consists of a ventilation pipe with a durable fly screen on the top.

Improvements over : Besides the drop hole with a lid, there is a hole for a vent pipe, which is covered with a fly screen to prevent in let of mosquitoes and flies.

Materials needed to make a brick VIP
1. Cement-5 Bags approx 
2. Sand- 2 cubic meters approx
3. Agg regate - 1 cubic meter approx
[materials used in construction, including sand, gravel, crushed stone, slag, or recycled crushed concrete]
4. Bricks- 1000 of 12.5X8X5cm
5. Reinforcements 2X8mmsteel bars
6. BRC 610 expanded wire mesh
7. GCIsheets, two 2.5mlong
8. Timber 5cmX5cmX12cm long
9. Binding strips 4mlong 
10. Building nails- 7.5 cms 1 kg
11. Roofing nails- 0.5 kg
12. Fly screen- 30cmX30cm

Dos and dont's
  1. The latrine should be at least 40 meters away from any water source
  2. The doorway of the VIP latrine should face the wind.
  3. The latrine should be down wind from the house
  4. The pit should be well above the ground water level
  5. The pit should be dug at least 3 meters deep; walls should be straight. The deeper the pit is, the longer it will last

A dual pit model is also possible for both VIP and Pour-flush toilet, where pits are used alternatively

click here to enlarge image

Further Readings:
How to Construct a Brick VIP Latrine,A step by step manual for training Public Health Technicians. Edited by Nicholas Greenacre. African Medical and Research Foundation and Kenya Water for Health Organisation.
 [C.eldoc1/d70d/how-to-construct-VIP-latrine.pdf]
Pit Latrines.  http://www.training.gpa.unep.org/content.html?id=207&ln=6
[C.eldoc1/d70d/undp1_060913zzz5B.html]
 



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