iWe think there may be a crack in the 1st flr ext wall as there is damp patches on interior wall ,right hand side of window? is it a good idea to seal the crack in exterior wall with silicone masonary sealer to prevent dampness coming through to the inetrior wall?Have used interior damp sealer but new paint still comes off. please advise as we've had so many diff answers from diff people. Thanks
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