2. Wood-frame cladding
2.1 Primary framework: rafters
The type of wood used for framing can vary considerably:
lumber, category 3 ( NF B52-001 ): spruce or Scots pine ;
Softwoods conforming to CTBA BS classification;
poplar conforming to CTBA BS or B grades;
Douglas fir conforming to CTBA BS, B or S classifications....
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Wood-frame cladding
Timber frame installation
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"Finishing work and technical packages"
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