Experience working with different wood and know where the best results you can get? There are many species of softwood lumber and hardwood used in building decks, which will all react differently to changing weather conditions prevailing.
However, some of these will give you a good short service life because lumps fall out or they are poorly preserved and rapidly deteriorating and rotting wood or in the case of their bad piece they break the screws that hold them down.
Most of the time quality will be the result of the purchase cost. In the timber market, 'price' generally reflects the 'Quality'. If you are searching online for custom timber then you can take a look here https://www.craigtimber.com.au/timber.html.
Only slow-growing softwood from cold and hot climates modified softwood should be used externally. It is identified by the closeness of the growth rings visible at the end of the timber. The wood gives the best performance in all categories that are documented is 'Ipe' pronounced (e-pay) for the top in the 'Endurance', 'stability', 'Violence', 'The Power'.
Class A has the same fire rating as concrete and will take place in the natural state over 40yrs. A bonus is that it also looks good. Why deck boards notched? Marketing/Advertising is a powerful tool when used to promote products to the UK market. Damp and wet winter/summer means that the grooved boards will provide a non-slip surface.
The fact is that the wet wood is used will only be slippery if not cleaned once a year as patio slabs. What you are not told is that the grooved boards collect dirt and debris, as it prevents water from draining away.
It is this build-up the wood deteriorates rapidly and thus makes it slippery. In some commercial applications, minimal maintenance and have a high footfall needed, shady areas or closed tree resin strips included.