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The use of inappropriate modern materials in traditionally constructed buildings can cause more serious problems than they are intended to solve. Repairs should generally be carried out on a like-for-like basis using materials and techniques that match those originally used. This will help to ensure that the old and new are compatible in terms of their performance and appearance. The only exception is where there is a fundamental design fault. For example, the valley gutters of historic buildings are often lined with pieces of lead that are too long to comply with current building practices. Lead is subject to thermal movement, and in overly long pieces this can lead to tears that will allow water to penetrate the roof.
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