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Waterproofing roof with lightweight aggregates

LIGHTWEIGHT COOL ROOF INSULATION CUM WATERPROOFING
An alternative to Brickbats / Integral type Waterproofing over roof / terraces  






































Cool Roof / Terraces   by definition is the covering on the uppermost part of a building structure  but significance of cool roof is one that has been designed to reflect more solar radiations and absorb less heat than a standard roof
A cool roof protects the building and its contents from the rain / heat /earth quake effects of all climate  primarily in India against rains, heat ,cold, .  
The characteristics of a cool roof are dependent upon the purpose / climatic zones  of the building that it covers, the available roofing materials and the local traditions of construction and wider concepts of architects designs and practice and , may also be governed by local or national laws ( still yet to amend)
 The conclusion :  
Designing   for any cool roof specially for heat insulation  the fundamental is to create an air space/cavities within composites layers  resulting in  light weight , and that is reversed in water proofing  where the same cavities  has to be blocked.

Existing  insulation  techniques  using minerals like vermiculite / perlite / XPS polystyrene  etc.  in expanded form are very fluffy /feathery /light in physical appearance, and when mixed with cement/sand/lime etc., gives excellent insulation values which aids in energy conservations, are low  compressive strength but at the same time creates unnecessary dead load due to huge water absorption capacities i.e ranging from  70% -90% of its volume , carrying  very low vapor permeability values/moisture  (i.e to escape water in the form of vapor / unbreathable ) from that composites layer    ,
 since  it has to be  covered with HDPE/BITUMEN/CONCRETE PLASTER   etc., for protection against  water  entrapped from top layer

Traditionally  proven over deck  techniques   are with brickbat / integral / brick jelly / matka filling etc., since it is  applied  for insulation cum water proofing  having good compressive strength
Brickbat Coba type waterproofing using broken brick 

Intergral type or brick coba treatment 


But in recent years have failed due reasons like dead loads/quality available / expert applicator/ building heights  / labour crisis etc.,
 So concluding   , demand have arise for over deck design that shall comprise of light by weight  , waterproofing having sufficient compressive strength

Litagg range :
1.     nodullar-lightweight aggregates/pellets
2.     Sintagg –sintered flyash aggregates
lexca-light expanded clay aggregates  

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