Timber treatment


Rot is a fungus that attacks timber in buildings. It grows best in dark and poorly ventilated areas; sub floors, behind panelling or possibly in loft spaces. As a result it can be difficult to detect before it is already established and done damage to structural timbers.

Dry Rot is the most serious form of timber decay and can spread rapidly if not treated. The first evidence of a dry rot outbreak may be a mushroom-like fruiting body or fine grey-white hyphae strands spreading over the wood, which can appear overnight.

Other dry rot symptoms include cracking or shrinking of the timber; it becomes dry and brittle, may darken in colour and will crumble at your touch. Dry rot can spread across timber and masonry and will even spread through thick walls to find timber to attack.

Wet Rot will remain localised to the source of damp but can still cause major structural damage. There are different types of wet rot but normally wet rot will occur when there is a high level of moisture, damp or humidity in a property.


The first and most important solution to rot is to resolve the excess moisture issue. JCJ Damp Proofing will first determine why the affected timbers are becoming wet. This could be a result of:

- Rising Damp
- Condensation
- Timber in contact with a damp wall
- Roof or pipe leaks
- Poor ventilation

Once the damp is resolved we will replace the defective timbers and undertake repairs, where necessary, to retained sections, including structural and decorative timber. All retained timber is treated using the latest fungicidal formulations to prevent further infection.

Where necessary, adjacent masonry is irrigated and its surface sprayed with one of our water-based biocides. This timber preservative treatment is generally surface-sprayed, but can also be applied by brush, injection, gel or paste forms.

Beetle Infestation


There are a number of different beetles that can infest a property, these are commonly known as woodworm. They attack different types of timber and need different conditions to breed.

However, it does not matter which type of beetle attacks your property they all have the same life cycle: a female beetle will lay eggs in a piece of timber, this larvae will bore through your timber and potentially cause vast amounts of damage and weaken timbers, this is considerably more of an issue to structural timbers. Once the larvae grows into a beetle it will bore its way out, leaving ‘fight holes’ and look for more timber to attack.


Some woodworm species like damp conditions and in these cases JCJ Damp Proofing will look to resolve the excess moisture issue. These issues will be very similar to the ones that can result in rot.

Once these issues are resolved we will look to apply an insecticidal formula to the affected timber. This will kill the beetle when they exit the timber and stop the beetle from finding other timber and continuing the life cycle.

Download our Timber Treatment factsheet