Many are the essences used for garden furniture. I have selected the following, which are more usually marketable.
Fir is certainly the most used, not because it is the most suitable, but because it is cheap and easy to find. On the market there are various products made of fir, from wooden houses, to structures (gazebos, canopies), flower boxes, fences, etc., normally raw, i.e. not treated with impregnating agents.
The durability of this essence, even if treated with impregnating agent, is very poor if left outdoors without adequate coverage. Normally under 5 years.
Acacia is a medium stable wood with a good durability (over 15 years) and on the market you can find tables, platforms, small furniture made with this essence. During the winter it is advisable to shelter these objects in a covered place or cover them with sheets.
It is a fairly stable wood with good durability (over 15 years). In the past, large quantities have been imported into Italy, but currently it has an uninteresting price-quality ratio.
It is a fairly stable wood with a good durability (over 20 years) and in commerce is used mainly for outdoor flooring. Like all tropical woods, over time it acquires a silvery grey color, which can be slowed down or brightened up with specific products.
Chestnut is an averagely stable wood with a durability of 10 to 15 years. Keep in mind that this type of wood is full of tannin (a substance intrinsic to the wood fiber) that pulls out when outdoors and stains the floor underneath. If used for poles, it is advisable to burn externally the part that goes into the earth (in this way it closes the pore) and treat it with tar.
It is one of the “prince” woods on a par with the better known Teak, because it is very stable and has a durability of more than 25 years, without chemical treatments. Also this wood becomes grey over time, used more for luxury flooring, very suitable for swimming pools. Excellent for quality/price ratio.
It is a stable wood with excellent durability (over 25 years) and exceptional value for money. I have an Iroko gazebo made in 1991 and it is always PERFECT, even without any maintenance. Of course it has acquired that silvery grey color, which by the way I like. It is used for high-quality structures and flooring and furniture and is suitable for swimming pools.
Without going into details between the European and Russian larch, we can say that it is a fairly stable wood with moderate durability. Attention! I have found, in the flooring made with this essence, that the sun and water make this wood splinter. Not suitable for barefoot walking. Suitable for structures, cladding and flooring (with the necessary precautions!!!).
It is a stable wood with good durability (over 20 years). This wood also contains tannin, but in a slightly lower percentage than chestnut. It is used for small furniture and flooring. This wood also turns grey over time.
To summarize it is a wood that should be bought already treated in an autoclave (the impregnating agent given by brush is useless, except for an aesthetic value) and, even if impregnated, it should be clarified if impregnated class 3 (durability 8/10 years) or class 4 (durability 10/12 years). It is a wood widely used in furniture, houses, floors (do not walk barefoot, splinter also this one) palisades, flower boxes, etc., because it costs little more than fir but certainly lasts longer.
Unfortunately, large retailers market this wood in products of very low quality, manufactured with less care than in industrial packaging. They deteriorate easily and everything to contain costs.
It is a “prince” wood, very stable and with a durability of more than 25 years, but even here we have to make some very important considerations. When we talk about Teak, we imagine that of beautiful boats, yachts, luxury ships, that’s the real Teak Burma, which for price reasons is unobtainable in the outdoor furniture sector.
In the world, more than anything else in Brazil, Africa, Indonesia, immense Teak plantations have been created, which feed the various manufacturers of furniture and flooring, but unfortunately the quality is not always very high. Over time, this wood also turns grey. In my opinion, the Teak of “cultivation” does not have an interesting quality/price ratio.