Co2 Douglas Fir ® about

About American/British Douglas Fir.

American and British Douglas Fir Suppliers

British Douglas Fir - Pseudotsuga menziesii

Douglas Fir was introduced to the UK in 1827 by Scottish botanist David Douglas. It is widely planted for both timber and ornamental reasons, and thrives in western areas of the UK, Please note British Douglas Fir traditionally has more knots and is softer compared to its American cousin.

Heart wood is light reddish brown when dry although quite pink when fresh sawn with contrasting creamy white colouration. There is a strong contrast in colour between early and late growth which gives prominent growth rings resulting in strong grain pattern and figure. British trees are faster growing compared to its American cousin which does alter the colour/density.

British Douglas fir is good for structural work rated BS EN 350 class 3 moderately durable. suitable for Cladding, Fencing, Decking and Flooring.

American Douglas Fir - Pseudotsuga menziesii

American Douglas Fir is an imported softwood Timber from North American. A sustainable timber with good workability and moderately durable, please see below. It has a density 620 lbf (2,760 N) on the Janka Hardness scale. Our Co2 Douglas Fir is PEFC.

Slower growing and denser than British Douglas fir American Douglas fir is good for structural work rated BS EN 350 class 3 moderately durability. Cladding, Fencing, Decking and Flooring.

Light brown colour with a hint of red and/or yellow, with darker growth rings and very few knot.


When selecting your timber type for your project it is worth taking in to consideration BS EN 350 timber durability class.

Durability is the ability of a species to resist decay either naturally or through preservatives. The Class is based on the ability of the heartwood (inner part of the tree) to resist fungal decay. The sapwood (the living outermost portion of the tree)is considered not durable and should not be used for external projects without preservative.

BS EN 350 has 5 classes of durability they are:-
Class 1 to 3 can be left as untreated timber, a natural ageing process will accrue e.g. most timbers will turn a grey colour. Class 4 and 5 will need to be treated with preservatives.

For further information see