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What cover does the spec require for the ground slab reinforcement?
The spec requires 40mm cover to the top face and 50mm cast against ground [1]. Drawing S-201 rev D notes the lift pit as the exception at 65mm [2].
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40 mm to the top face, 50 mm cast against ground. S-201 rev D notes the lift pit as the exception at 65 mm.
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40 mm top, 50 mm cast against ground1. Lift pit is the exception at 65 mm.
3.4.1 — Cover shall be measured to the outermost reinforcement including fitments.
3.4.2 — Ground slabs: 40 mm cover to the top face and 50 mm where concrete is cast against ground.
3.4.3 — Where a membrane is provided beneath the slab, cover may be assessed as for a protected face.
3.4.4 — Exposure classification A2 applies to elements cast below ground unless noted otherwise on the drawings.
3.4.5 — Tolerance on cover: +10 mm, −5 mm, measured to the fitment in accordance with AS 3600 cl 17.5.3.
3.4.6 — Cover shall be maintained by purpose-made bar chairs or spacers at 800 mm maximum centres; brick, timber or scrap packing is not permitted.
3.4.7 — Cover to cast-in fixings, ferrules and conduits shall be not less than the cover required for the adjacent reinforcement.
3.5 · Blinding and surface preparation
3.5.1 — Blinding concrete shall be minimum 50 mm of N15 placed on the prepared subgrade and finished to a tolerance of ±10 mm.
3.5.2 — The vapour barrier shall be lapped 200 mm at joints and taped, turned up at all penetrations.
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Drawing
S-402 rev C · L4 slab details
Note 6 — cover to ground slab reinforcement 40 mm
Specification
Spec 03 30 00 · cl 3.4.2
Cast against ground — cover shall be 50 mm
Spec governs. S-402 rev D is current and carries the 50 mm note.
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