Wood used in Venetian Blinds


Western Hemlock (Tsuga Heterophylla) is a fine-grained softwood that matches many hardwoods feature for feature and quality for quality. This hard wearing, versatile and attractive wood is achieving an international reputation for form and function.

The heartwood and sapwood are almost white with a purplish tinge. The wood often contains small, sound, black knots that are usually tight and dimensionally stable. Dark streaks are often found in the lumber; these are caused by hemlock bark maggots and generally do not reduce strength.

Kiln dried Hemlock is very stable with little tendency to cup, or twist. Being lightweight, stiff and straight grained, resin-free and uniformly textured, Western Hemlock is a superb joinery material with an outstanding performance record. It is ideal for louvre shutter and venetian blind production.


Native to North West America, Western Red Cedar (Thuja Plicata) is one of the most highly prized softwoods the world over. Slow growing and naturally durable, Western Red Cedar has one of the longest lifespans of any North American softwood.

This exceptionally beautiful wood has natural colouring in mellow ambers, reddish cinnamons and rich sienna browns.

It is relatively lightweight, has a true and straight grain, is resin-free and uniformly textured, and has an outstanding dimensional stability. Western Red Cedar is ideal for louvre shutter and venetian blind production. Western Red Cedar is also an excellent thermal insulator, and also has an ability to absorb and dissipate sound energy.


Western Hemlock and Western Red Cedar grow on the western edge of the coastal mountains from Southern Alaska to Northern California. The principal supplying region is the coastal forest region of British Columbia. Hemlock and Cedar grow in mixed forests with other species such as Douglas Fir, Balsam Fir and Sitka Spruce. Forestry practices are guided by the internationally recognised sustainable forest management system elements of ISO 14001 as part of the CSA Z809 Canadian national standard.

DIMENSIONAL STABILITY Timber has a cell structure which “breathes”, absorbing and releasing moisture depending on the surrounding humidity and temperature. The net effect of this is that wood “moves” and changes shape slightly.

Although extreme care is taken to ensure that only timber of specified moisture content is processed, and that the coating process is thorough, some venetian blind slats may change shape slightly. If bowing of slats is going to occur, it usually happens in the first 2-3 weeks after installation. The specification is for allowable bowing not to exceed 4mm beyond a straight line, after which the slat is replaced.


Window Coverings are perhaps the severest application in terms of UV damage. A UV block is incorporated in the lacquer coating, which provides a good resistance to yellowing.