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Q. Ideally I would like to build a brick wall (6-8 courses) with the
timber section of the shed above that. In doing this (or even thinking
this) am I exposing myself to flak from the regs police?

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I'm not sure about the brick wall aspect. Certainly check that - it
rings slight warning bells.

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This 'dwarf wall' base construction used to be the common construction of
greenhouses so it's probably O.K. , but still worth checking.

Cic.