The blockwork should be as accurate here as when above the DPC - otherwise blockwork above DPC will not be accurate - it figures.
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| The outer leaf is left one block down from the DPC and the cavity filled with a weak concrete mix to that level. Bitumonous paint will be applied before the blockwork is taken above DPC - this is further described at Block work to joist level |
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The photo to the left shows the preparation below slab to support chimney breast - a lot of blocks laid flat. |
