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"Preserving the past for our future"


Wood Boring Insects

All wood boring insects are known under the generic term woodworm.  By far the most common of all insects that attack seasoned timber is the Common Furniture Beetle  (Anobium punctatum).  Among other less common insects are the House Longhorn Beetle, the Death Watch Beetle and the Wood Boring Weevil.  The following schedule describes the various stages in the eradication of the effects of insect attack.

Roof Void Timber Disinfestation Treatment

  1. Lift floorboards where necessary.
  2. Brush down all timber surfaces as necessary and remove debris from void as required to facilitate treatment.  Lift roof insulation material before treatment and leave on site.
  3. Cover water tanks with polythene sheeting as necessary.  Protect exposed junction boxes and ends of electrical conduits.
  4. Spray all accessible timbers with Permethrin insecticidal fluid.
  5. Clear away and leave site tidy.

Floor Timber Disinfestation Treatment

  1. The client to remove, in advance, all furniture, floor coverings, goods and chattels.  Floor coverings should not be replaced until floor surfaces are dry.
  2. Lift floorboards as necessary to give access to the underside of boards, joists and floor framing timbers. Replacement of any damaged boards will be the client’s responsibility.
  3. Clear out between the joists as necessary.  Protect exposed junction boxes and ends of electrical conduits.
  4. Spray all accessible timber with Permethrin insecticidal fluid.
  5. Relay floorboards and treat top surface of boards.
  6. Clear away and leave site tidy.

Staircase Timber Disinfestation Treatment

  1. Client to remove, in advance, all stair coverings.  These should not be replaced until surfaces are dry.
  2. Where access to the underside is restricted by a soffit, a small hole will be drilled in the riser to facilitate treatment, and a top surface treatment applied.  Holes will be left open for ventilation.


The use of Permethrin based insecticidal fluid has been cleared under the UK Governments Pesticide Safety Precaution Scheme.  Permethrin has been shown to be safer and more effective; it also has the advantage of having a very low odour, and being non-staining.  A major advantage is that its use permits the newly introduced re-entry time to treated areas after only 1 HOUR.

Wood Rotting Fungi

Fungal decay of timber in buildings is classified either as Wet or Dry Rot.  The two fungi commonly causing Wet Rot are Coniophora puteana and Fibroporia vaillantii.  The term Dry Rot refers to decay caused by the true Dry Rot fungus, Serpula lacrymans.  It is extremely important to distinguish between the two types of decay, since they require quite different treatments.  Both Dry/Wet Rot require complete removal of the infected timber and its replacement, with new timber treated with preservative.  However, in the case of Dry Rot it is essential that the full extent of the outbreak, in the masonry and plaster is also identified, and treated accordingly.  This can only be done by the removal of plaster and subsequent irrigation of the whole area.

Dry Rot Treatment

  1. Cut away all defective timbers within a radius of one metre from the last visible signs of attack of Dry Rot, and burn on site.
  2. Hack off wallplaster or renderings one metre beyond the last visible signs of Mycellium, and remove all Mycellium growth from the wall surface.
  3. Protect exposed junction boxes and ends of electrical conduits.
  4. Drill holes in exposed masonry areas, and inject a fungicidal fluid to thoroughly saturate the masonry.
  5. Pre-treat all timbers before reinstatement and isolate from masonry and/or oversite.
  6. Re-plaster in accordance with our standard specification.
  7. Eradicate the source of moisture contamination and provide adequate ventilation.
  8. Clear away and leave site tidy.

Wet Rot Treatment

  1. Cut away all defective timber.
  2. Eradicate the source of moisture and provide adequate ventilation.
  3. Reinstate with pre-treated timbers and isolate from masonry and oversite.
  4. Spray area with fungicidal fluid.
  5. Clear away and leave site tidy.

Important Notes

  1. Dry Rot treatment work may necessitate the use of percussion drills which may cause some vibration.  The client is requested to ensure that any items of value which may be dislodged, displaced or damaged are removed from the area.  Whilst every care is taken during the works, we cannot be responsible for any unavoidable damage.
  2. Bodied mayonnaise type emulsion preservative will be used as considered necessary.
  3. All floor coverings, furniture, fittings and other obstructions, must be removed prior to the arrival of our technicians.  Where areas for treatment are obstructed or inaccessible due to the failure of the client to carry out such removal, we will, where considered practical, and entirely at our own discretion, facilitate such access as necessary.  In such cases we cannot accept any liability or responsibility for damage, howsoever caused.  We reserve the right to charge, as an extra for such additional works the rate applicable at the time.  Our technicians are instructed to contact our office prior to any commencement of such extra works.
  4. We reserve the right to alter the provisions of this specification in such respects as may be found necessary during the course of the works.



Our timber treatments are subject to a 10-year guarantee on final completion of the contract, in accordance with our standard terms and conditions.

Timber Disinfestation Treatment

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