Pre- or post-construction termite treatment?

Subterranean termites reach a building from the soil beneath and around it. Every anti-termite treatment is therefore an attempt to put a continuous treated zone between the soil and the structure. The only real question is whether you are doing that before the building exists or afterwards.

Pre-construction: treating the ground before the pour

Pre-construction treatment applies termiticide to prepared ground in stages as the build progresses — to the excavated base before blinding, to the backfill placed against foundations, and to the final levelled surface immediately before the slab is cast.

The result is a continuous treated zone across the entire building footprint, including the parts that will be permanently inaccessible once the slab is down. Nothing achieved after construction matches that coverage, because nothing after construction can reach under the middle of the building.

Why it has to be staged

This is the part developers underestimate. It is not one visit. Each stage has to land in a specific window in the build programme, and the window between final levelling and pouring is the one that closes permanently.

• Stage one — the excavated and prepared base, before blinding
• Stage two — backfill against foundations and pile caps, as it is placed
• Stage three — the final levelled surface, immediately before the membrane goes down
• Plus individual treatment of every service penetration and expansion joint

Each stage produces a treatment record for the project file and handover pack, which is usually what the main contractor actually needs alongside the work itself.

Post-construction: treating a building already standing

Once the slab is cast, the ground beneath it can only be reached from above. Post-construction treatment drills holes at intervals along the external perimeter, internal wall bases and expansion joints, injects termiticide under pressure to form a treated zone, then seals and makes good the holes.

Where termites are already present, the treatment has a second half: direct treatment of the infested joinery, and removal of mud tubes so any recolonisation is visible. Doing the barrier without the timber, or the timber without the barrier, is why some treatments appear to work and then fail a few months later.

What it cannot do

It cannot produce the coverage a pre-pour treatment would have. The zone is created from the perimeter and the accessible internal lines, which approximates a full-footprint barrier without reproducing it. It also cannot repair damaged timber — treatment stops the colony, it does not rebuild joinery.

Side by side

If you are building

Specify it at design or early works stage, not when the ground is already levelled and the pour is booked for tomorrow. The work has to be coordinated with the main contractor so each stage lands in an existing window instead of creating a new one.

The documentation matters as much as the chemistry. Treatment records per stage go into the project file, and a client taking handover will increasingly ask for them. Our construction site services cover this alongside the rodent and mosquito programmes live sites usually need.

If you already own the property

Then the question is not which treatment but whether you need one yet. Start with an inspection, not a treatment quote. It establishes whether activity is current, what species, and how far damage extends, and the report is written either way.

If you are not sure what you are looking at, our guide to termite signs in Dubai villas covers mud tubes, hollow timber and how to tell termites from flying ants.

What to ask about the warranty

Any anti-termite treatment should come with a stated warranty period, in writing, on the quote before you accept it. The period varies with the method and the substrate, which is why it is quoted after an inspection.

• Is the warranty period written on the quote, not just mentioned?
• What does it actually cover — re-treatment, and under what conditions?
• Is a follow-up inspection included within the period?
• For pre-construction, is a record issued for every stage?