-MH- said:
The width of growth rings depends on how fast the tree grows, which depends on factors such as the climate and where the tree grows. Pine from Småland that grows on poor soil is fine timber.

Spruce that grows on fertile soil has a large growth ring width, which doesn't matter much for construction timber. Studs in densely grown wood insulate worse, for example.

Whether it twists or not is mostly a genetic issue.

There's nothing as myth-laden as this matter of timber and quality. Every homeowner is an expert. :)
Ok, I'll start swabbing the timber;)
 
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KnockOnWood
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-MH- said:
Topsa?
Om det vrider sig eller ej är mest genetisk fråga.
That's how you check the genetics :)

But for those of you who are obviously knowledgeable:
Is it true that only spruce is used for exterior paneling, not pine? Why?
 
Spruce absorbs less water than pine, and the heartwood and sapwood have about the same resistance to moisture, but in pine, the differences are greater.
 
If humans did not want constant improvements, we would still be in the trees in Africa. ;)
 
It is quite naive to believe that product development always results in a better product. Often, it is about maximizing profit.
 
Regarding OSB, there must be qualities that have thickness variation down to +/- 0.3 mm. OSB/3, OSB/4 are standardized quality products intended for use in load-bearing structures. They must be fully defined with all necessary material parameters (static, heat, moisture, fire, etc.).
 
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