Formwork Finish Classes (Concrete) Building Codes & Rules

Straight Edge (a - b)

s

≥ 10 to ≤ 15m

1.25m

10m

300

5m

10m

10m

5m

300

f

f

10m

≤ 5m

≥ 2m

≥ 2m

1.25m

1.25m

Straightedge

b

b

Out of Plumb - Rectangular Column

• 300mm plumb vertical distance from top & bottom surface
• ≥ 2 readings on adjacent faces

f

f

f

f

f

f

f

≥ 2m

300

300

300

≥ 200

s

300

1.25m

Concealed Cupboard

a

Straightedge

300

f

300

Component Length

1.25m

300

f

300

300

f

Out of Plumb - Wall

• 300mm plumb vertical distance from top & bottom surface
• ≥ 2 readings at ≤ 5m O.C. wall length

Surface Undulations

• 300mm & 1.5m Straightedges
• ≥ 30 readings of elements with ≥ 2m in either direction
• ( a - b ) reading evaluation

Ceiling Soffit

Blowholes

• ≥ 2m viewing distance
• 1:1 scale photo comparison for blowholes evaluation (refer to AS 3610.1)

Form Face Deflection

• ≥ 10 readings at ≥ 300mm intervals in the same direction of the span
• "d", tolerable distance between straightedge & finished concrete

Uniform Tie Rod Hole Pattern

Flatness

• Patterned Surface
• 1.25m x 1.25m grid pattern
• clear 300mm on plane's edge

Flatness

• Non-pattern Surfaces
• 10m w/ overlapping 5m reading along straight line
• "f" tolerable gap between string line & finished concrete

Face Step

• ≥ 200mm straightedge intervals over whole visible step
• "s" tolerable gap between straightedge & finished concrete

Tolerable gap

• 5mm 95% surface reading
• 7mm 100% surface reading

Out of Plumb - Circular Column

• 300mm plumb vertical distance from top & bottom surface
• At 90° angles from each other

≤ 2mm or Span / 360

• Within Element
• 1mm 95% surface reading
• 2mm 100% surface reading
• On Construction Joints
• 2mm 95% surface reading
• 3mm 100% surface reading

d

• ≤ 1mm 95% surface reading
• ≤ 2mm 100% surface reading

Tolerable gap

• 4mm 95% surface reading
• 5mm 100% surface reading

≥ 1.5m

≥ 3m to < 8m Ht.

• 6mm 95% surface reading
• 8mm 100% surface reading

< 3m Ht.

• 3mm 95% surface reading
• 5mm 100% surface reading

a

≥ 300

Straight Edge (a - b)

• ≤ 2mm 95% surface reading
• ≤ 4mm 100% surface reading