My basement was waterproofed with Oldroyd Xv 4 years ago. The pump failed , went unnoticed and a serious flood ensued. There is now green mould over everything and about a foot up the walls. Will a new installation be necessary or can it be fixed?
You are best advised to contact the firm who installed this cavity drainage membrane system in the first place, because the flooding may have caused damage to the seals, particularly at the wall to floor junction, in which case it could well need to be renewed.
The presence of mould confirms the continued presence of a high degree of moisture so it needs investigation.
It is also worth noting that a dual pump installation is always preferable (together with an alarm system) to guard against pump failure because, as you now appreciate, the consequences are serious.