Range
Cladding Range
Durability must be taken into account when designing a building that incorporates
timber cladding. The chosen timber should be classed as moderate to very durable
if used without preservative treatment and, with the exception of Thermowood,
all sapwood should be excluded.
Western Red Cedar
Western Red Cedar can be used in two products designed for external building
coverage:
- Cedar shingles and shakes are more commonly used as roofing tiles but are also ideal for giving a distinctive look when used to clad buildings. Special products such as fancy butt shingles can be used as decorative infill panels, either in additional courses or to cover whole walls. For vertical cladding shingles and shakes are applied at a wider gauge than is used for roofing and courses can be doubled up to give a strong shadow line.
- Traditional timber cladding - longer lengths of board are available in several different profiles. These can be applied either machined or fine sawn in a vertical, diagonal or horizontal fashion.
Western Red Cedar is highly durable and resistant to decay, giving an anticipated
60-year service life without any need for preservative treatment if sapwood is
excluded (As in BS5589). It is a very stable, low movement, lightweight wood (390kg
per m3 when dry), that is straight grained containing few small knots.
Thermowood
A new and unique product from Finland, Thermowood is manufactured from European
Redwood timber that has been treated at a high temperature to reduce sap and resin
levels. No chemicals are involved in this process that produces a rich, warm coloured
timber that will last up to 5 times longer than untreated boards. The process
also renders both heartwood and sapwood equally durable offering a 30-year service
life and carrying the environmental safeguard of PEFC certification.
A range of 4 profiles are stocked with both a machined and fine sawn finish.
Other timbers
John Brash also offers several other timbers that are suited to various cladding
applications, which are available to order:
- European Redwood -this is not durable so requires preservative treatment. It is also quite heavy (510kgm3) and a medium movement wood so care needs to be taken in cladding design and construction to allow for these factors.
- Siberian larch - this wood is hard and moderately durable but more heavy (590kgm3). It is a small movement wood and if the sapwood is excluded it can be used untreated. Light in colour varying from yellow to a light brown it possesses good resistance to impact and wear due to its high density.
- Home-grown Larch and Douglas Fir - also moderately durable but quite heavy (530kgm3). Again both are small movement woods. It is recommended that homegrown Douglas Fir is preservative treated.
- European Oak hardwood - durable but heavy (720kgm3), if this wood is used green then allowance must be made in design and construction for shrinkage and splitting of the boards.
Hot Oil Cladding - Coloured Cladding with a Difference
The process used to create Hot Oil Cladding was originally developed as a drying
medium for timber. A blend of mineral and vegetable oils were used under heat
and vacuum to remove moisture from wet timber. It was discovered that timber
dried by this process benefited from some new unique properties which enhanced
its performance.
Hot Oil Cladding is a stabilised building material with many added value opportunities
for the timber cladding market. It is created using a two stage enhancement process,
the timber is preserved with a modern copper based preservative system. Colour
pigments can be added to the oil to give an attractive pre-finnished look. A
range of colours are available - contact John Brash form more information.
Benefits: The surface of Hot Oil Cladding is sealed with oil to stabalise and
protect the timber surface, reducing cracks and surface deterioration caused by
the natural swelling and contraction caused by mositure movement in unprocessed
wood. The addition of colour creates a pre-finished product that will perform
well in external applications, reducing the need for hand application of a coating
and costly short term maintenence.
Hot Oil Cladding
For more information on the John Brash Timber Cladding, please contact John Brash
Technical Sales on: 01427 675 588.
