SiOO:X treated cedar clad house in County Kildare, Ireland designed by HOUSE7 architects


Timber cladding is being used increasingly as a priority choice amongst architects and designers for use as a protective skin for buildings. This is a reflection of the natural and unique quality that wood provides. Whether the project is a large scale development or a small private dwelling, timber cladding gives greater flexibility in design, is versatile, attractive and environmentally friendly. Having made an often significant investment in timber cladding the question of how it is best protected arises.

This natural look is increasingly sought after but the challenge is, how to achieve it without taking the risk of uneven weathering on different aspects of the building, or in protected areas, such as overhanging eaves. Another issue can be the unsightly tide marks caused by extractive wash out, a particular problem with western red cedar.

Discoloured untreated larch facade


Discoloured untreated Western Red Cedar facade

SiOO:X provides a solution by mirroring the natural ageing process and accelerating the creation of the silver-grey appearance and giving long life protection in a completely environmentally friendly way.  

SiOO:X penetrates the wood and gives a light surface that is pleasant to touch. Apart from the surface being beautiful, it also is a barrier to algae, mould and rot from gaining a hold in the wood. The surface is very easy to wipe down making maintenance simpler. The SiOO:X treatment reinforces and strengthens the wood surface and is very easy to apply. It is applied once as against the necessity of annual treatments with oils.

To achieve the best penetration and optimum results, use sawn timber or at the least prepare the timber surface by sanding with no finer a paper than 60 grit. Avoid applying to dressed surfaces as any mill glaze resists penetration and can result in less than optimum performance. Because of better quality control, factory treatment by an approved applicator is strongly recommended with treatment to all sides of the cladding boards to achieve full envelope protection.