I would think damp problems depends which part of the UK you live in. In my area most of the town is built on marsh land . so a high water table has always been there. Also I taking note over the years the different kind of bricks used in building the homes . Some are just a soft red glaze with 8 half inch holes cast in the brick when fired other have 3 big 2" holes some bricks are so hard almost like a steer foot brick. So let say you drill the bricks with the holes in them as soon has the fluid starts to pour in it just floods the brick and you waste fluid the hard brick well you could be there all day trying to inject a brick. If anything salt is the problem in my area and very often not treated for.
And then we go onto the rendering side of dpc , Who the feck said it;s ok to render at 3-1 s+c all your doing is trapping moisture in the brick work, creeps up the wall until blows out on the old lime rendering or even just blows the render off the wall seen this so many times. Also have to say guilty of this myself in the past. The rentokill copper strip well thats for another time.
if u luk on dryzone website theres a price list which includes the app gun
