Ed_Zep wrote:

A plasterer has just finished a chemical DPC at my house and
replastered. One of the walls was really bad but it's all done now.

ouch. From your comments it sounds like you've been got.


This same wall, a few days later is still damp (he used Limelite
Renovation for both layers). I'm just wondering how long I should wait
until for this patch to dry out.

just forget about it. If its still damp in 6 months, the cause hasnt
been fixed. Brick walls take months to dry out. At this point theres no
knowing if the dpc man did anything that would make the wall dry out,
only time will tell. Often they remove soil and vegetation from the
outer side of the wall, which fixes the problem.


Is there any paint-on damp proofing that I could use to cure this
remaining problem?

Painting things on wont draw the water out. Quite the opposite, any
barrier only slows evaporation down.


He just said "give it a while". Hmmmm...

I did notice that the bricks were still damp before he replastered. It
happened to be the worst bit out of the lot, anyway. The bricks above
it had turned white from the treatment and seemed mostly dry. The ones
lower down are the ones still wet.

Is it worth gently heating the room to see if I can find out whether
the treatment's worked?

I see no connection between the 2.


Supposing it didn't work is it possible to drill into the wall and
reapply some more of the DPC chemical without having to knock off the
plaster?

sure, but entirely pointless. A DPC has nothing to do with damp
problems in almost all cases.


NT