ACS Boron Timber Rods - Boron Woodworm & Dry Rot Treatment

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ACS Boron Timber Rods - Boron Woodworm & Dry Rot Treatment

ACS | Boron Wood Treatments

Boron Timber Rods are cylindrical implants composed entirely of anhydrous boric oxide. Boron Timber Rods contain the maximum level of borate preservative available in rod form. Boron Timber Rods are approved under the EU Biocides Products Directive, Authorisation Number UK-2013-0796. 

Available in a range of different sizes, 10 Rods Per Pack.


Boron Timber Rods

Boron Timber Rods are used as a wood preservative to control wood rotting fungi and wood boring beetles in new & existing structural and joinery timbers.

The preservative is mobilised when exposed to dampness (wood moisture content greater than 35% w/w).

Suitable for use in timbers already at risk of or showing signs of decay (see also Wykabor 10.1 and Wykabor 40.1) or as a preventative treatment in sound dry timbers which may be exposed to wetting in service (e.g. window, door frames).

Note: For full protection against wood boring beetles where the timbers may remain relatively dry in service, and / or protection against fungal decay due to surface wetting which does not mobilise the protective agent in Boron Timber Rods, a surface application of a suitable liquid preservative as an adjunct to rod installation is recommended.

Boron Timber Rods are approved for use as directed under The Control of Pesticide Regulations 1986. Read all precautions before use.

For Professional Use Only.

  Read our Guides on 'How to Treat Woodworm & Wood Boring Insects' and 'How to Identify & Treat Dry Rot and Wet Rot on Timbers'

Product Details:

Boron Timber Rods are supplied in 5 Sizes, 10 Rods per Pack.

  • (W) 8mm x (L) 24mm

  • (W) 8mm x (L) 48mm

  • (W) 8mm x (L) 65mm

  • (W) 12mm x (L) 50mm

  • (W) 12mm x (L) 100mm

Product Benefits:

  • Highly concentrated wood preservative implants

  • Convenient to handle.

  • Full cross-section protection in damp wood

  • Wide range of applications

Active Ingredients:

Boric Oxide 87.4% w/w

Disodium Tetraborate 9.81% w/w

Preservative Power: 1g Boron Timber Rod is equivalent to 1.69g Boric acid equivalents. (The toxicity of boron compounds to insects and fungi depend on the boron content, which is normally expressed in terms of equivalent amounts of boric acid). 


Health & Safety Recommendations:

Take the usual labour hygiene into account.

PPE should be worn during application. See our Safety & PPE Products.

Consult label and material safety data sheet for more information.


All bats are protected under the Wildlife and Countryside Act 1981. Before treating any structure used by bats, consult English Nature (etc).

Before deciding on an appropriate preservative treatment, carefully evaluate the structural integrity of timbers and/or replace those considered unsound (isolating from masonry where possible). Locate and rectify sources of moisture and improve ventilation as appropriate.

Following assessments by a qualified surveyor sound and / or slightly decayed timbers left in contact with masonry or soil below DPC level, or in other situations where there is a continuous source of moisture, may be treated with Boron Timber Rods (possibly together with other Boron Products). However, the full extent of eradication or protection cannot be predicted generally. Re-inspection at least every 5 years is therefore recommended under these circumstances.

Timbers treated with Boron Timber Rods may exhibit surface crystallisation of boric acid under certain circumstance and this should be taken account of when considering their use for the protection of internal (uncoated) decorative timbers.

Boron Timber Rods are compatible with all conventional wood primers and exterior wood coatings, and will have no adverse effects on paint adhesion.

Application Method:

Drill holes in the timbers to be treated approximately 1-2mm greater in diameter and at least 10mm longer than the rod to be used.

The hole should be drilled to a depth not more than 20mm from the rear of each section.

Once inserted (pushed firmly to the bottom of the hole) the rods are sealed in position with a suitable filler or plastic cap / timber dowling.

The number and configuration of the holes / rods will depend on the type and use of timber and the area considered at risk of wetting.

For window frames, in most situations, rods (of a suitable diameter/length) should be inserted at 100mm intervals along the grain (e.g. sills) and at 50mm across the grain.

In vertical elements the first rod should be placed no more than 50mm from any end grain / joints. Overall coverage of ca. 6-7kg Boron Timber Rods per m³ should be achieved in vulnerable areas.

In joists, a similar pattern is recommended but special care should be taken to ensure protection of concealed (built-in) sections in contact with masonry.

The first holes should be as close to the masonry as possible and drilled downwards at an angle to finish not more than 30mm from the joist end.

For fence posts drill a hole at 45° to the groundline to a depth at least equal to 110% of the post diameter (see diagram below) and insert a rod of appropriate size.

It may be considered advantageous to apply Boron Timber Rods in conjunction with Wykabor 40.1 in order to provide a ‘fast’ and ‘slow’ distribution of the preservative material into the surrounding timber (especially if some decay is already established or the wood moisture content at the time of treatment is below 35% w/w).


When desired, paint finishes can be applied to dry timbers surfaces without delay.

Data Sheets

Technical Data Sheet

Safety Data Sheet

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