It’s all about the basement.
This is a Local Authority owned building with a Basement structure that, historically, had been ‘tanked’ with a bituminous coating.
As is often the case mineral salts, which are carried ‘in solution’ have been trapped between the brick face and the bituminous coating and this has led to the spalling of the bricks and the coating is now peeling from the brickwork.
We were employed to provide a solution upon which competing contractors could provide a quotation on a like for like basis.
In this instance the options for treatment, bearing in mind the damage that the bituminous coating had caused, were limited and a, ‘Type C’ cavity drain membrane system was specified as this will provide a long term solution without, adversely, affecting the status quo of the structure.