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This design is in accordance with BS 5268-2:2002 Structural use of timber - Part 2: Code of practice for permissible stress design, materials and workmanship, and BS449 - Specification for the use of structural steel in building.
Timber to be covered, this calculation is not to be used for timber which is fully exposed to the elements.
Wane as allowed in BS 4978:2007 + A2:2017 is permitted.
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