DAMP PROOF COURSE

DAMP PROOF COURSE 

MATERIALS USED AS DPC 

• FLEXIBLE : bitumen 

• SEMI RIGID : mastic asphalt 
• Min lap distance between bituminous felt sheet : 100 

• STONES : high dense stones are used eg. Granite, slates 

• BRICKS : water absorption should not be greater than 4.5 % 

• PLASTIC SHEETS : 0.5 - 1 mm thick polyethene sheets are used 

• Flat roof is affected more due to dampness 


METHODS OF DAMP PROOFING 

• Finishing mortar : 1 : 4 
• Creating a concrete layer 1:6:12 (costly) (combination of concrete layer and terrazzo also used) 
• Damp proofing compounds ( 2 - 10 N for 1 bag cement) 

FOUNDATION DAMP PROOFING 

1. Air drain / water drain 
• Air cavity is provided 

2. Termite attacks 
• White ants cause damage to building str

Sub terrain termites  
• Ground nesting termites 
• Damages building structure
 • Methods to prevent damage : 
• Soil treatment ( mixing DDT , BHC with soil ) 
• Structural barrier 

Non sub terrain termites
• Wood nesting termites 
• Damages furniture


PREVIOUS YEAR REPEATED QUESTIONS BASED ON DPC


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