What Does a 10-Year Timber Pest Warranty Actually Cover?

What the Warranty Covers

The 10-year pest warranty provided by St. Xavier Timber on VPI-treated timber covers failure of the timber due to attack by termites and wood-boring insects in timber that has been correctly treated to the specified retention level and installed in appropriate conditions. In plain terms: if VPI-treated timber is attacked by insects within 10 years of treatment, and it was installed correctly, the warranty applies.

The warranty is backed by the treatment records for the batch. Every order of VPI-treated timber leaves St. Xavier Timber with documentation confirming the species, cross-section dimensions, pre-treatment moisture content, VPI cycle parameters, preservative concentration, and achieved retention level. These records form the basis of any warranty claim.

What the Warranty Does Not Cover

The warranty covers pest attack — not all forms of timber degradation. It does not cover mechanical damage, structural failure due to overload, decay caused by prolonged water contact (for which borate treatment is not designed), or any damage caused by improper installation or use.

The warranty also specifies the installation conditions under which it applies. Boron Borax treatment is designed for dry, interior, and sheltered above-ground applications. It is not suitable for ground contact, repeated water exposure, or marine applications. Timber installed in conditions outside this scope — embedded in wet soil, used as exterior decking subject to regular rain and ponding, or used in a marine structure — is not covered by the pest warranty, because the treatment chemistry was not designed for those conditions and the preservative will leach out over time.

• Covered: termite attack and wood-boring insect infestation within 10 years
• Not covered: fungal decay from prolonged water contact
• Not covered: damage from ground contact or repeated rain wash
• Not covered: mechanical damage, overload, or fire
• Condition: timber must have been installed in dry, sheltered, above-ground applications
• Condition: original treatment records must be retained as evidence

Why Documentation Is the Foundation of Any Warranty Claim

A warranty claim requires proof that the timber in question was actually treated to the specified standard. Without the treatment record, there is no basis for establishing what treatment was applied, at what retention level, or whether the treating facility was properly registered.

This is why retaining treatment records is essential — not just for warranty purposes, but as part of the building file. For any construction project, the treatment records for structural timber should be included in the handover documentation provided to the building owner. If the building is ever sold, renovated, or subject to an insurance claim involving timber damage, these records have direct value.

How to Make a Valid Claim

If timber treated by St. Xavier Timber shows signs of insect attack within the warranty period — exit holes, boring dust, mud tubes, or soft or hollow sections — the first step is to contact us with the original treatment record, the date of installation, and a description of the symptoms and location.

We will arrange an inspection to confirm the nature and cause of the damage. If the damage is consistent with insect attack on correctly installed VPI-treated timber — which is an unusual event given the nature of the treatment — we will work with you to establish the appropriate remedy. If the inspection reveals that the damage occurred due to conditions outside the warranty scope (water contact, ground installation, or similar), we will explain the findings and discuss what remedial options are available.

Using the Warranty as a Specification Tool

For architects and quantity surveyors, the availability of a documented pest warranty on VPI-treated timber is a useful specification and procurement tool. Requiring a 10-year pest warranty from the treatment provider as a contractual deliverable effectively mandates the use of a reputable, certified treatment facility — because only a facility operating to the required standard can issue a warranty it will actually honour.

Including a warranty requirement in the schedule of works also creates a clear audit trail: the warranty document identifies the treating facility, the treatment date, and the specification to which the timber was treated. This information is useful throughout the building's life, not just during the warranty period.