Construction

Thatch Roofing

 

Thatch roofing consists of full bamboos tied to Purlins with split bamboo frames on its top. Grass Poolas should be placed in 2 to 3 layers on bamboos frame as specified.

 Layout of Thatch Roofing

  • Bamboos should be placed at a distance of 12 inches and tied to Purlins with Moonj Ban. 
  • Split bamboos frame, 6 inches square should be laid on the top of bamboo rafter and tied with Moonj Ban.
  • Grass Poolas should be placed touching each other with their lengths parallel to the sides of the roof.
  • Grass poolas should be opened and spread such that the thickness at eaves is slightly more than 7.5 cm. 
  • It should then be roughly leveled.  
  • Second row of grass Poolas should be taken in hand, exactly the same way as lay already. 
  • Having laid grass Poolas in second and third layers they should be tied with Moonj Ban to the bamboos frame. 
  • Loose end grass should be cut to maintain a straight line.

My kind of thatched roof.....

(This picture is contributed by "S.Krishnan")

Raw Materials used for Thatch Roofing

  • Bamboos: Bamboos should have a diameter of 40 MM. They should be dipped in crude oil before use. Full bamboo placed 30 cm apart should be tied to ‘Purlins’ with tarred ‘Moonj Ban’. Split bamboo, ‘Jaffri’ 150 MM mesh should then be laid on the top of bamboo rafters and be tied with ‘Moonj Ban’.  
  • Grass Poola: ‘Grass Poola’ should be of best quality grass straw, well selected, fresh, clean, free from thorns, seeds etc. The straw should be laid in a pile of about one meter width and three meters length; each layer should be sprinkled with water to make the damp. The thick end of ‘Poola’ should be kept downwards and these be tied tightly to bamboo frame with ‘Tarred Moonj Ban’.

Grass Poola....A best quality grass straw.

(Thi picture is contributed by "S.Krishnan")

  • Moonj Ban: Moonj Ban is tarred string (Rope) made from local materials Moonj Grass. This rope is used to tie up the items where required. It is generally used in remote areas.  

Advantages of Thatch Roofing

  • Thatch Roofing is very useful for remote area of villages where temporary shelter for workman/animals is required.
  • It is very economical for construction site where temporary huts are required for labor for some time.
  • It can be built with local material by local labors. 
 

Disadvantages of thatch Roofing

  • Thatch Roofing is purely temporary structure. 
  • It is not much safe against disaster. 
  • It can easily destroy by wind pressure and catches fire quickly. 
     
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