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__________ material is made of black polythene having a thickness of about. 50 mm to 1 mm.(a) Brick(b) Stone(c) Plastic sheet(d) Cement concreteI had been asked this question in a job interview.This key question is from Dampness in chapter Damp Proofing, Water Proofing and Termite Proofing of Construction & Building Materials

Answer» RIGHT choice is (c) Plastic sheet

Explanation: The plastic sheets are made of black polythene having a thickness of about 0.50 mm to 1 mm with usual width of wall and it is available in ROLL length of 30 metres. This TREATMENT is RELATIVELY cheap but it is not permanent.


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