Damp Proofing

We provide specialist damp proofing treatments in Truro and throughout Cornwall along with specialist re-plastering techniques to coincide with all chemical damp proof course installations. The treatment carries our own 20 year guarantee which can also be complemented with an independent 10 year insurance guarantee issued by Guarantee Protection Insurance Ltd GPI


Whether you require a specialist timber and damp report in Cornwall or damp proofing in truro, Padstow or Penzance or basement water proofing in Perranporth, Newquay, St Austell, Bodmin, Wadebridge, Falmouth, Helston, Launceston or Looe we can help please contact us for a hassle free no obligation inspection and quotation.

NEWSEAL are approved contractors for Permagard products a leading manufacturer of chemicals for the remedial treatments industry.

Chemical Damp Proof Course

This method is both odourless and very safe to use. all our damp-proof are installed as per specification laid out under the BS6576. Dampness causes the most rapid and severe degradation of building materials and decorations. It causes unsightly spoiling of decorations, disfiguring mould growth and deterioration of plasterwork. More importantly, it is responsible for the most destructive mechanism of structural deterioration dry rot (Serpula Lacrymans).


Replastering is an important part of curing dampness. Although injecting a chemical based damp-proof course will prevent any further damp rising, the damp already present has to dry out naturally. Hygroscopic salts taken up into the brick will have contaminated the existing wall-plaster, causing staining and watermarks on the wall surface. This must be taken off and replaced with new plaster that is mixed to the correct specification to prevent the salts that are still present in the brickwork, transferring over into the new plaster-work and causing the staining to re-occur.

Structural Waterproofing

Application is by means of two slurry coats painted onto the bare brickwork or a render base coat, this can then be plastered over and permanent decoration can then take place within a period of a few weeks. Alternatively a Newton Membrane System can be affixed to provide a permanent barrier.

Newseal Ltd

Newseal is a specialist timber and damp company based in Truro Cornwall dealing with woodworm, dry rot, rising damp, cavity wall tie replacement and structural repair