Thermal expansion on wooden beams

[anaitis]

According to this page, the longitudinal movements are only 0.01% per percentage point moisture content, not 0.06%, which is the case with anaiti's example.

Furthermore, there aren't very large variations in the moisture content in the wood in a house. This is not an important factor, but maybe everyone agrees on that.

Oops! Has my memory failed me?
I'll see if I can find any information in the literature.

 

[jon_h]

The page doesn't feel like the absolute best source, though, but I didn't find anything better through a cursory search. But feel free to check if you have literature available.

 

[Johan Gunverth]

Metrics and theories aside; the 5-meter planks in my pine floor have not moved even measurably.

 

[anaitis]

Found a reference:

Movements in softwood during drying from fiber saturation to absolutely dry wood.
Tangential direction, along the growth rings approximately 8%
Radial direction, across the growth rings approximately 4%
Fiber direction, in the trunk's longitudinal direction approximately 0.3%

So it was from 28% to 0% it was supposed to be!
Memory also failed regarding the axial movement.

Sorry!

 

[Tigersågen]

Hm, then I wasn't completely off track. If I interpret you correctly, there is an insignificant expansion in the length of wooden studs at elevated temperatures and humidity levels, but it's not something that is taken into account when building. I am a happy amateur and hate toe-nailing mostly because it becomes terribly difficult to correct. Instead, I am a heavy user of nail plates, angle brackets which are then fastened with anchor screws. Easy to remove and adjust .

Best regards/Tigersågen