Building Regulations Approved Document C revised edition

3 Building Regulations Approved Document C (revised edition) 

The Building Regulations Approved Document C was revised in 2004. One of the key changes was that the old trigger levels for methane and carbon dioxide were removed (1% and 1.5% v/v, respectively). The guidance now requires a risk-based approach to the assessment of groimd gas. The key points are listed below  

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