Thermo ash -
dark and resistant
Thermo ash is a heat-treated ash with a chocolate-coloured tint throughout. For production, the ash wood is heated to temperatures of more than 160° C (≈ 320°F) for 24 to 48 hours under oxygen deprivation. Depending on the height and duration of the temperature development, the woods change colour from a light light brown to dark brown.
The thermal treatment increases the rot resistance of the wood. It also reduces the water absorption capacity, which in turn minimises the tendency to swell, shrink and cup and protects the wood from fungal attack. But there is a negative development in the susceptibility to longitudinal cracks, e.g. when drilling and screwing in screws. Therefore, the holes must always be pre-drilled during assembly!
for thermo-ash seat rests
The classic use of thermo-ash is as decking boards. For this reason, particularly flat formats are readily available. We have chosen 25 mm x 120 mm as the standard dimension in stock. This can be used to create visually harmonious bench tops with a total width of approx. 500 mm (4x plank with width 120 mm + intermediate spacing). Other dimensions for your custom-made products are possible by arrangement.
Thermo ash is a natural product -
with all its advantages and disadvantages
If you choose thermo-ash as a surface for your bench, your garden furniture or your storage box, you must be aware that wood is a natural product – with all its advantages and disadvantages. Warping, colour differences, cracks, stone inclusions and other irregularities are part of this renewable raw material. So surface cracks are normal and tension cracks are possible even with thermally treated wood. A normal width is 1-3 mm and the length can vary. Stress cracks mainly happen along the front, where the water intake and water release is higher. Note: Cracks are no reason for complaints.
Colour differences are a natural feature of the renewable raw material due to the inhomogeneous nature of the wood and different growth areas, as is the natural onset of wood greying. But neither of these influences the durability of the seat surfaces.
Oiling as a remedy against greying of wood
Without oiling, any wood – including thermally treated ash – will turn grey within a few months and take on the silvery appearance typical of wood. Thermo ash has an average lifespan of up to 20 years in a moderate climate. This is not significantly prolonged by oiling. The only purpose of oiling is to delay the greying of the wood. To delay this effect, the surface should be treated once or twice a year.
Tender text for GaLaBau, for landscape architects and planners
“Thermally-modified ash wood, chamber-dried, residual moisture under 20%. Surface planed and sanded on all sides, all edges beveled 2 x 45°. Surface sliqutly oiled.”