Hi, the divan needs to be away from the wall to allow ventilation, ideal temperature and ventilation should be obtained throughout the house, ventilation in key in areas like the bathroom and kitchen, very unlikely this is a failed DPC/DPM issue.
Dear Megan Your divan is not the cause of the mould but the damp that has penetrated your wall. Most probable causes OF the damp is the lack of DPC (damp proof course) or DPM (damp proof membrane) or parts of both damaged. Other causes may be your external ground level less than 150mm below your DPC level or a pipe leak...etc There are companies that provide chemical injections, liquid DPMs and offer warranties for their work. We are using CEDARECARE on regular basis and recommend them.
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