Stockpile & treat (bund method)

The bund method is a hybrid Japanese knotweed removal technique that combines physical excavation with herbicide treatment. It is most suitable for large, phased development sites where construction-critical areas must be cleared quickly and there is sufficient space for temporary stockpiling.

What is stockpile & treat?

Stockpile & treat is used where knotweed-infested soils lie within areas that need to be built on early in the programme. The method involves:

Excavating soils containing viable rhizome from construction-critical zones
Moving these soils to a designated non-critical area
Laying out the stockpile, ideally in layers no deeper than 500 mm
Encouraging regrowth from the rhizome, which is then treated with herbicides

Throughout the process, strict controls are put in place to prevent the movement or spread of knotweed material to otherwise clean areas of the site.

How effective is the stockpile & treat method?

Stockpile & treat can be a highly economical option, but it has specific suitability requirements.

It is ideal for large development sites with ample space for the stockpile
The treated material should remain on site unless it is consigned off site as potentially knotweed infested
If the stockpile is made deeper to save space, herbicide treatment is prolonged and may require more than two growing seasons

For sites without the necessary space or where faster remediation is required, alternative methods such as Xtract™ may be a better fit.

Insurance-backed guarantees

A 5 or 10 year insurance-backed guarantee, underwritten by an AA- rated insurer, can be provided on completion of the works. These guarantees are widely accepted by banks, building societies and other lenders.

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