Finman
Queen Bee
- Joined
- Nov 8, 2008
- Messages
- 27,887
- Reaction score
- 2,024
- Location
- Finland, Helsinki
- Hive Type
- Langstroth
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Here is a Finnish UPM ply handbook, 68 pages.
http://www.forestindustries.fi/Infokortit/handbookplywood/Documents/HandbookOfFinnishPlywood.pdf
Spruce/pine ply is better than birch ply to hives.
Water content of ply may rise up to 30%. Above 20% ply start to rotten.
Heat conductivity is worse in conifer ply and their are lighter than birch.
The weight of 18 mm conifer ply is 11kg/m2 + moisture
The weight of pine is 450 kg/m3 and conifer ply is 520 kg/m2
Moisture may add the weight 40% (= water content 30%)
So in moist condition the weight may be 600-700 kg/m3.
.
Here is a Finnish UPM ply handbook, 68 pages.
http://www.forestindustries.fi/Infokortit/handbookplywood/Documents/HandbookOfFinnishPlywood.pdf
Spruce/pine ply is better than birch ply to hives.
Water content of ply may rise up to 30%. Above 20% ply start to rotten.
Heat conductivity is worse in conifer ply and their are lighter than birch.
The weight of 18 mm conifer ply is 11kg/m2 + moisture
The weight of pine is 450 kg/m3 and conifer ply is 520 kg/m2
Moisture may add the weight 40% (= water content 30%)
So in moist condition the weight may be 600-700 kg/m3.
.