There are many different types of wood boring insects but the most common of all is the furniture beetle, which is easily identified and treated. However, there are varieties of beetle that eat timbers from the inside and these will cause structural damage and will be more difficult to identify and treat. You should employ a specialist contractor that have been trained to identify tell-tale signs of this type of insect attack. Many contractors may apply Sovereign Sovaq FLX Insecticidal Fluid saturation or Sovereign Deepkill Paste. These works usually carry a thirty-year guarantee.