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Why choose engineered timber

As a company we are constantly reviewing our environmental policy, so we took the decision to use engineered timber as a result of much discussion and investigation. As a result we now use engineered timber for most of our Redwood windows.

A sustainable solution made from renewable products. The wood effectively locks carbon into the building structure rather than releasing it into the atmospherw. This is a feature that is recognised in international climate agreements for carbon accounting.  Engineered timber  is more sustainable and environmentally friendly than solid timber, as it creates 25% less waste.

Finger jointing Technology

Finger jointed timbers uses the best, fault free pieces of wood where defects are removed. The fault free sections are laminated together to make a much stronger, better quality piece of wood which can be up to 6 m long.

Finger jointing technology is recognised as the most stable method to produce very long wood components, removing knots and shakes which would otherwise lower the strength of the timber. By using finger joints, it is possible to join short pieces of wood into one much longer, stronger better quality, stable timber.

Several cuts of wood which are glued, pressed and laminated together in a pattern of alternating wood grains, and  finger-jointed together. This alternating grain ensures that engineered timber is always pulling against itself, reducing the warping and bowing associated with solid timber. This results in a product that will last a lifetime and offers more stability than solid timber. In the past we would have had to source pieces of redwood timber appropriate to the size of the frame, which is wasteful, as the offcuts have no purpose.

The Benefits of engineered timber in a Nutshell

  • Dimensional Stability
  • Uniform performance and appearance
  • Less handling
  • Reduced waste
  • Durability
  • SBD tested
  • FSC® & PEFC Certified

Timber products are classed as carbon-negative since they remove carbon from the atmosphere and can always be recycled. Even when the unit has come to the end of its life it can be broken down and used again.

A recent study, “Carbon, Fossil Fuel, and Biodiversity Mitigation with Wood and Forests,” stated that using wood as a building-material substitute could save “14 to 31 percent of global CO2 emissions and 12 to 19 percent of global FF [fossil fuel] consumption by using 34 to 100 percent of the world’s sustainable wood growth.”

Here at AJ&D Chapelhow we  purchase timber only from sources that hold either the  FSC® or PEFC™ chain of custody certification schemes.

To find out more about engineered timber visit


To find out more about the wood we use take a look at our Guide to Wood page