chapter  7
Masonry separating walls
Pages 8

Frogged brick s wer e lai d 'fro g down' , potentiall y reducing wal l densit y (possibl e impairmen t o f sound insulation) . Ref: Building Regulations AD E: Wall types 1, 2 and 3.

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Areas o f wall wit h reduce d mas s (e.g mixe d type s of block s or bricks used). Ref: BRE Report 238, Appendix C.