Damp Proofing

Durwood Building Services Ltd are a approved contractor for Biokill Crown the UK’s largest manufacturer and supplier to the Building and Construction industry of Damp proofing Chemicals, Timber Preservatives, and Waterproofing Products. This gives us access to technical consultation on both product and practise from the leaders in the industry.


As a approved contractor issuing our 30 Year Protection Guarantee Scheme we have fulfilled the conditions and attained the standard required for acceptance as a Biokil Crown Approved Contractor. This standard is based on working to BS6576 for the diagnosis and installation of a damp-proof course and BWPDA code of practice for remedial timber infestation diagnosis and treatment.

Rising Damp

Rising damp is ground water that rises up through stone and brick walls by capillary flow this is generally caused by either no damp proof course or the existing damp proof course has failed. Rising damp can usually be identified by a damp tide mark up to 1 meter in height. Rising damp can be treated by injecting a chemical damp proof course into brick or stone.

Penetrating Damp

Penetrating damp is usually caused by leaking rainwater goods such as guttering and down pipes or where the external ground is higher than the damp course.


This is the most common form of damp which can often lead to mould growth due to water that has condensed on cold surfaces.

The main causes of condensation are:

  1. To much water vapour.
  2. Inadequate heating.
  3. Inadequate ventilation.
  4. Poor insulation leading to cold spots.


Wood Boring Insects

The most common of all is the Common Furniture Beetle also known as Woodworm this can be indentified by its boring holes which are circular 1-2 mm diameter. Treatment for infestation is to spray all infected timber with a organic – solvent insecticide

Wet Rot

Most common of all wet rots are the (brown rots) also known as cellar fungus. The cause of wet rot is when timber becomes saturated with water which causes the wood to darken and crack both along and across the grain. Treatment for wet rot is to cut out structurally unsound timber and replace with new treated timber then treat the area with a wood preservative and insure adequate isolation from damp walls.


Dry Rot

Dry Rot refers to wood decay by the fungus “Serpula Lacryrmans” it is very difficult to detect in the early stages as it nearly always develops out of sight beneath floorboards, plaster and paneling etc. The successful remedial treatment of dry rot can require elaborate and sometimes expensive control measures.