Recomended damp proofing companies

[KarlosFandango]

I've got to have a damp proof layer put into an old building. It looks like the injection sort might be ideal but I need somewhere reputable to do it that can give 30 year gaurantees, and that hopefully won't go bust ten minutes after finishing the job.

As this is the fountain of all knowledge I'm sure some of you have can advise

[s crane]

paul smith 07759900646 colchester