The requirements of an ideal materials for damp proofing are:
➤ It should be impervious.➤ It should be flexible.
➤ It should be easy to carry out leak proofing joints.
➤ It should be stable.
➤It should be durable. It’s life should be as much as the life of building itself.
➤ It should resist the load safely.
➤It should not contain sulphates, chloride and nitrates.
➤It should be cheap.
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