To differentiate penetrating damp from rising damp, the surveyor should note:

A surveyor observes damp on a ground floor at 450mm height with clear white salt tide mark extending to
700mm. No external defects are visible. Calcium carbide test shows 24% moisture. The diagnosis is:

Under COSHH regulations, before using hazardous substances on site, the employer must:

When diagnosing penetrating damp, the surveyor should assess:

A surveyor encounters a property where the client reports "moisture everywhere" after recent heavy rainfall.
Upon inspection, moisture appears at multiple levels: ground floor shows tide marks at 400mm with salts (rising damp indicator); first floor shows scattered patches linked to a failed roof flashing (penetrating damp); and bathrooms show black mould on cold walls (condensation). The surveyor should: