There are many wood species available, but let's look at some examples: Pine, Douglas Fir, Okoumé, Larch, Oak
Pine
Pine is the most widely used wood for wooden frames. Despite being the most economical, it has excellent insulation and stability characteristics. It is also recommended because, coming from controlled and extensive plantations, it makes a great ecological contribution to planet Earth.
Douglas Fir
Douglas Fir belongs to the same family as pine - softwoods that are therefore excellent insulators. Its fine, reddish and compact grain was fascinating for a long period in the past. Today this characteristic is less appreciated and the increased cost at origin has made its use less frequent.
Okoumé
Okoumé is light and pinkish mahogany-like, meaning similar to mahogany and therefore aesthetically appreciated. It lends itself well to various colorations. Of African origin without replanting, using this material goes against good ecological sense.
Larch
Excellent strength, durability and insulation, but stability is at risk, so this material is strongly recommended in the Laminated type.
Oak
Oak has always been considered one of the best materials for frames thanks to its noble appearance, great strength and durability. It is a prestigious and expensive wood, very often used in furniture as well. However, being a hardwood, unfortunately in terms of thermal insulation it has inferior characteristics compared to softwoods.