We've just had our garage converted and our builders have laid a screed floor. Unfortunately soon after it was laid it started crumbling and holes were appearing in places, as electricians and plasters came in to do their work and walked all over it, they did put black sns plastic sheeting down to protect it though, but it obviously didn't hold up too well. The builders solution to remedy the problem was to lay latex over the top of the screed. This has solved the problem however white/grey circles/rings have appeared all over it which appear to be spreading (see photo) and I am wondering why? We have also noticed mould is appearing at the base of the skirting board (see photo).
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