We use pressure treated timber to give your housing a longevity but what, you may ask, is pressure treated timber?
Timber, once cut from the tree and sawn, is no longer living and would therefore decompose naturally if not treated with a preservative to give it longer life. Treating timber with a tanalith preservative (usually referred to as 'Tanalised Timber') is the best way to protect the timber against decay. It is widely used in garden furniture and other outdoor timber products today. If a softwood isn't treated it would be attacked by naturally occurring bacteria, fungi, moulds, insects and would therefore start to degrade within a year or so.
'Pressure Treated' means the timber has been soaked with a wood preservative in a timber impregnation tank, in a vacuum, to ensure it is forced deep into the timbers. The preservative used for our timber is TANALITH-E, an eco-friendly preserver, which is a water-based wood preservative containing copper and organic biocides. Copper is an excellent protector against insects and rot. The biocides contained in the TANALITH-E brand of wood preserver are supported under the Biocidal Products Regulation. In 'days of old' the preserver in tanalised timber used to contain harmful compounds like arsenic, chromium and cadmium. This toxic mix is no longer allowed in the EU thankfully so we can rest assured that today, tanalised timber is safe around all creatures.
When forced into the timber, the preservative bonds with the wood structure and therefore doesn't allow it to degrade over time. However, some maintenance is advised to make sure your timber is waterproofed and to ensure a long life outdoors (see our Fair Care Warranty
Tanalith-E Timber carries a 15-year anti-fungal and anti-rot warranty so with proper care, and some easy maintenance, it can last outdoors for 30 years or more. This does depend on how the timber is exposed to the weather of course. Exposed to wind, rain and cold weather will shorten its life compared to placing in a sheltered garden. Equally, placing the timber in or on wet ground without a further coating will hasten its degradation.
Pressure treated timber, when fresh, has a green tinge to it but once outside and exposed to sunlight the green colour weathers down to a nice honey brown colour and eventually becomes a natural silver grey. This weathering process does not mean there is any loss of preservative protection. Timber is, it should be remembered, a variable and natural product and some types of wood can occasionally contain higher resin levels which can give a blue colouration after treatment. However, this rapidly fades into the overall colouration of treated timber.
When the treated timber arrives in our yard here in Dorset, we put it in-stick for up to 6 weeks and allow the beautiful Dorset wind to reduce the moisture content before we take it into the workshop to build our timber products. Any cut ends, holes or notches we make are sanded then brushed with an end grain preservative to maintain the integrity of the preservative protection.
It should always be remembered that timber is from a naturally grown plant and although we work hard to make it do what we want it to do, there are occasions when it misbehaves. If you are at all concerned about any aspects of your unit, or need advice, please just get in touch.