All manufacturers are able to offer a comprehensive range of protective and decorative topcoats to protect the Intumescent basecoat from corrosion attack and are available in a wide range of RAL and BS4800 colours. All structures have a Corrosion building classification depending on the environments they are as follows:
C1: Very low corrosion risk, warm dry interior such as offices, schools & hospitals etc,
C2: Low corrosion risk, steelwork exposed to moisture such as vehicle depots, sports halls etc
C3: Medium corrosion risk, steelwork exposed to moisture and pollution such as Breweries, swimming pools
Within a Category 1 environment a topcoat will not be required unless the Intumescent will be visible and the client requires a decorative/coloured finish.