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47 Preservative-treated wood foundations
A
typical wood-frame wall
finished grade (minimum slope of 1 in 12)
free-draining backfill treated exterior plywood polyethylene (stops at grade) gravel bed 125 mm (5 in.) minimum
framing strap treated wall stud treated plywood cover 38 x 89 mm (2 in. x 4 in.) treated blocking between studs (backing at panel joint) treated wall plate treated footing plate treated screed board concrete slab polyethylene
300 mm (12 in.) minimum
B
treated subfloor treated floor joist polyethylene treated wood sleeper
C
treated blocking between studs (backing for panel joint and nailer for interior finish)
D
polyethylene and exterior sheathing
38 x 140 mm (2 x 6 in.) ledger subfloor floor joist treated stud treated top wall plate treated wall plate polyethylene
treated wall plate treated screed board concrete strip footing resting on undisturbed soil water passages 60 mm (21⁄2 in.) minimum diameter at 1.2 m (4 ft.) o.c. concrete slab on polyethylene compacted granular drainage layer polyethylene capillary break
Note: Shaded areas indicate those members that are preservative treated.