Timber and Related Products

Chestnut
Wood type Hardwood
Environmental Not listed in CITES. Believed available from well-managed sources. Check certification status with suppliers.
Distribution The tree occurs from south-west europe, including Britian, northwards to France, south-west Germany and Australia, North Africa and Asia Minor.
The Tree In favourable situations sweet chestnut attains a height of 30m or more and a maximum diameter of 1.8m with a straight, unbranched bole of about 6m, but in less favourable conditions, the undivided bole is little more than 3m long after which it divides off into several huge limbs so that the general character of the tree is altered.
The Timber The sapwood is narrow, and distinct from the heartwood which is yellowish-brown in colour, closely resembling oak in appearance but lacking the silver-grain figure characteristic of that
timber, resulting from the finer rays. The grain may be straight, but is more commonly spiral, particularly in wood from old trees, while logs are liable to cup and ring-shake. It weighs about 560 kg/m3 when dried. On account of its somewhat acidic character chestnut tends to accelerate the corrosion of metals, particularly when moist. It also contains tannin, as a result of which blue-black discolourations are prone to appear on the wood when it comes into contact with iron or iron
compounds.
Drying The timber is rather difficult to dry, retaining its moisture in patches, and tending to collapse and honeycomb; this form of defect does not respond well to reconditioning treatments.
Strength Although resembling oak in appearance, chestnut is less hard and tough, and some 20 per cent inferior in all its strength properties to that timber.
* MECHANICAL PROPERTIES
Note: In BS 5268-2: 2002, there is a discrepancy between Tables 7 and 15 regarding characteristic density and Strength classes for use in joint design. The values quoted here should be used, rather than those included in the 14 March 2002 edition of the Code.
Working Qualities Good - Good
Durability Durable
Treatability Extremely difficult
Moisture
Movement
Large
Density
(mean, Kg/m³)
560
Texture Medium
Availability Limited
Price Medium
  Stains in contact with iron in damp conditions
Use(s) Trim, Exterior joinery, Interior joinery, Structural
Colour(s) Yellow brown