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Timber Resin Splice (TRS)

A Timber Resin Splice (TRS) is a Rotafix patented solution for repairing, by replacement, damaged and under specified timber members.  New sections of timber can be species and moisture matched and joined using our innovative design approach and specially designed Resiwood materials.

Resiwood Timber resin splice repairs have been used in many UK and International historic buildings where there is a requirement to retain as much of the original material and features of the building as possible.  Our low disturbance technique is a cost effective way of breathing new life into original features.


  • Maintains as much as possible of the original timber
  • Flexible options according to the access you have to effect the repair
  • Our epoxy adhesive materials are designed specifically to be compatible with wood
  • Low disturbance to building fabric
  • Cost effective solution compared to complete removal and replacement
  • Upgrades the strength and performance of the original wood

The diagram below shows typical examples of Timber Resin Splice Units.




Timber Resin Splice repairs can be used in the following applications:-

  •  Joists
  •  Lintels
  • Tie beams
  • Bressumers
  • Wall plates
  • Posts
  • Glulam Beams


Rotafix has the capability to provide machined and fully prepared TRS units that have the bonded in rods in place ready to be fitted. To meet your design we can machine slots and drill the holes into any material that you would require.

We manufacture and supply the Resiwood adhesives, rods, plates, and supply the tools you require to ensure the success of your design.

It is imperative that all damaged and decayed wood is removed from the parent timber. The cause of the damage, be that infestation, moisture ingress or inadequate design, needs to be established and rectified prior to the installation of the replacement TRS to ensure a long term effective repair.

Rotafix recommend boron based products for both eradicative and preservative treatments to timber.

TRS units are all tailor made to suit your design.

Standard sections of timber are shown below. For softwood we recommend C24 Planed All Round Timber. Other section sizes are available by bonding together pieces of standard sized timber.

         Width mm             Height mm       
47 100
47 150
47 200
47 250
47 300
75 225
75 250
75 300
100 150
100 250
100 300
150 300

 Rotafix will endeavour  to make the TRS as close as possible to your size, however there is a standard tolerance on manufactured timber.The tolerance on the dimensions of the TRS units are+3mm - 1mm.


Rotafix have developed and implemented solutions that have been independently tested, with a broad range of construction materials. Architects, structural engineers and contractors need to determine the most suitable of the Rotafix range of materials available.

Rotafix are able to supply TRS units in the following materials to suit your needs.

  • Graded softwood
  • Hardwood
  • KERTO, VERSA-LAM (Paralam)
  • Laminar Veneered Lumber (LVL)
  • Cross Laminated Timber (CLT)
  • Accoya
  • Glue laminated graded softwood


Graded softwood such as C24 is commonly used for TRS units. Graded timbers are selected purely to ensure that the quality and strength of the timber are not compromised by knots or grain patterns.


Rotafix resiwood adhesives perform excellently in hardwood. The small particle size of the adhesives gives excellent penetration of the 2 part thixotropic unfilled adhesives such as Rotafix Structural Adhesive (RSA).


KERTO/ VERSA-LAM is a laminated timber made up of 3mm rotary sliced sheets bonded together to give a dimensionally stable and predictable engineered product designed specifically for structural members.

KERTO / VERSA-LAM can be laminated to provide section sizes as required. Rotafix have the in-house capability to laminate the KERTO / VERSA-LAM to meet your requirements.


Accoya is an Engineered Wood Product (EWP). Accoya is dimensionally stable, machines well and is extremely durable for outside applications. Accoya accepts paint and stains well. It is guaranteed for fifty years above the ground and twenty five years in the ground.


GLULAM or Glue Laminated Timber can be used for the manufacture of TRS units. Depending on individual laminate size it is often possible to miss out a laminate or laminates to accommodate a rod side slot. GLULAM is becoming increasingly popular for large architectural spans.


The following materials can be used to bond the principal and secondary adherent. All of the following materials are available from Rotafix: 

  • Carbon Fibre Reinforced Plastic  (CFRP) plates, W50mm x T2mm, up to 5m in length
  • Glass Fibre Reinforced Plastic (GFRP) plates, W100mm x T4mm, up to 5m in length
  • Glass Fibre Reinforced Plastic (GFRP) rods,  5, 6, 8, 10, 12, 16, 20mm up to 2.5m in length
  • Stainless Steel Rebar
  • Stainless Steel Threaded Bar
  •  Small diameter rod bundles can be used where you need to be able (remove) to bend the reinforcing material to be able to insert into the drilled timbers.

The choice of the material to be used is very much dependent on the access available and the performance you are looking to achieve. All the Rotafix adhesives have been tested for compatibility with each of the above materials.


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Welcome to Rotafix Ltd | Timber Resin Splice

Rotafix Ltd, Rotafix House, Hennoyadd Road, Abercraf, Swansea, UNITED KINGDOM, SA9 1UR
Phone: +44 (0)1639 730481 Email: sales@rotafix.co.uk

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