In certain circumstances replastering of walls following chemical d.p.c. insertion is not feasible, e.g. friable
wall surfaces, uneven wall profiles etc. Where dry lining is to be carried out this should be in accordance with
the manufacturers' recommendations. Care should be taken to ensure that gypsum adhesives are not used
in 'dot and dab' applications directly onto the wall surface. Timber used as battens must be pre-treated and
all cut ends re-treated on site. Ventilation should be provided behind the system until the walls have dried out
to reduce the possibility of condensation within the void.
Where high levels of salt contamination are present, or suspected, or where walls are persistently damp due
to the presence of high concentrations of hygroscopic salts further preparation may be required. In such
cases reinstatement can proceed in conjunction with a ventilated dry lining system based on a high density
polyethylene (HDPE) membrane which provides a vapour impermeable surface suitable for conventional
plastering and/or dry lining techniques. If doubt exists as to the extent or nature of the salt contamination, we
should be consulted.
