terminology
LVL - laminated veneer lumber
dar - dressed all round
rh - rough header - (has grooves to prevent twisting)
MGP10 - machine graded pine, with elasticity E=10MPa
H3 - treated for above ground external use
treated pine
contains copper, which when wet induces electrolytic corrosion of
steel , or zinc plated fasteners
must use either stainless steel , or specially coated copper alloy fasteners
F5 and F7 pine is visually graded so that even though its physical properties
may in reality be identical to MGP10 , they are not guaranteed to have
suficient elasticity to match MGP10 in critical structural applications such as
replacement of hardwood floor joists
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