Comment on Damp Proofing a Basement by Adding a Damp Proof Membrane (DPM) by JJM.
We recently had the managing agents of our building throw a quote of £12k for basement damp proofing with a local company (one of the most established in the town) in East Sussex. The building also had to DPC as it was built in the early 1800s. The damp proof company completely over-blew the spec. We, the leaseholders, employed an independent damp proof specialising surveyor. He said half of the works were completely unnecessary, and the other half were inappropriate. We saved £7,000 on the damp proofing, which goes to show that one shouldn’t always trust a specification drawn up by a ‘reputable’ damp proofing firm. Get an independent surveyor who specialises in remedial works of this type (there are only about 12 or so in the whole of the UK) to draw up a spec and then get the quotes based on that. Their is an obvious conflict of interests if those specifying the works also do the job.