Otherwise additional support – such as steel or timber beams – should be introduced which in turn will be required to be adequately supported and provided with fire resistance.
Fel arall dylid darparu cynhaliaeth ychwanegol – megis trawstiau o ddur neu bren – y bydd angen iddynt hwythau yn eu tro gael eu cynnal yn ddigonol a chael y gallu i wrthsefyll tân.