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  1. H

    Insulating between joists that are below DPC ?

    On replacing some of the joists on the ground floor of my old terraced house I noticed that some were sat on a bit of slate or DPC whilst others were just on the brick plinth. On closer inspection, the original tar/bitumen DPC for this room is located two bricks above the brick plinth the joists...
  2. H

    What is this on the underside of my floor?

    Anyone able to ID this white powdery stuff that looks like efflorescence on the underside of my chipboard floor? It's over a poorly vented suspended floor, and feels slightly damp to the touch. The topside is fine and shows no signs of damp but I'm not quite sure exactly what it is and what I...