Properties to be aware of when buying Timber Products
As Timber and timber products are is a natural material with well documented properties of expansion and contraction according to its environment then timber highly susceptible to relative humidity and weather conditions.
When you purchase any garden timber product you purchase a timber product and should be aware of its properties:
Most timber used is kiln dried (except in the case of certain hard wood furniture type products). In general it is not seasoned. BOTH processes result in splits and cracks as wood will always respond to its environment regardless of how “Free Moisture” has been removed.
Presure Treated Timber
It should be borne in mind that Pressure Treated (using any branded product ie Tanalize, Tanalith, Wolmanit etc) whilst offering a very long life span to timber garden products actually exacerbates the effect of the natural environment on a timber product hence splits and cracks in pressure treated products are VERY common, they can be deep and can appear quickly however again they do not affect the structural integrity of a product.
Another common feature of pressure treated timber is that as the wood slowly dries, and consequently contracts there is frequently a residue that appears on the surface of the wood. This residue can be mistaken for mould but it is not. The residue can be wiped off or simply left as it will weather away in anycase.
Both Pressure Treated and Factory Dipped products can apear to be unevenly treated owing to the uneven capacity of wood across its surface to absorb treatment. Please be assured that both processes involve completely immersing the wood in wood treatment hence it is not possible that the wood is actually unevenly treated - it is simply how the wood actually appears after treating.
All Timber will expand and contract according to its environment. As a result of this expansion and contraction – it is very common to see splits and cracks developing in the wood. These can sometimes be significant however they do not affect the integrity of the product and will usually close over time (but not always). Splits are extremely common during the spring and summer as the wood begins to dry out and consequently to contract on its outer surfaces before the core of the wood dries hence the outer surfaces contract over a still expanded core of the wood. The result of this is that splits and cracks appear along the grain of the wood. These splits are not a fault, and as a result are not covered by any warranty, and do not affect the structural integrity of a product that has been correctly assembled but are simply a part of the how timber products respond to their environment.
All timber will feature knots. This is part of the appeal of timber product and is in no way a fault.