Hi - I need to build a single block wall on top of an existing cavity wall for a first floor extension but can't find anything to 'seal' the cavity with prior to building .. can someone point me in the right direction?? Thanks!
..Thanks - yes that is more what I meant something to close (rather than seal) the cavity so I can build a single block wall on top of a cavity wall - I wasn't sure what they were actually called so I am sure that will help!
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