Design

Determine with Client what strategy is to be implemented:

• Total exclusion (entirely dry internal environment)
• A system of control (some water entry and damp patches acceptable)
• A combination of the two.

Below grade design must consider:

• Standard MPX 17600 series of drawings
• Adequately sized (minimum 600mm x 600mm) access panels provided for cavities greater than 600mm and at a minimum 4m centres where cavity is less than 600mm centres
• Cavities as a confined space.
• Hobs cast in monolithically with the floor where practicable.
• Falls to drainage outlets

Basement slabs in contact with stone must:

• Have cut rock faces with intermediate basement slabs set back with a minimum gap of 50 mm. Consider netting to prevent rock fall from bridging the gap.
• Have a slab soffit with a drip groove cast in. As an alternative, a diverter may be used.

Penetrations must:

• Be detailed and installed to prevent water entry.
• Have puddle flanges
• Have hydrophilic wraps and seals
• Slope away from the building.
• Not be located hard to the floor or slab soffit.

Subsoil drains must:

• Have access to clean out subsoil drains as required by AS3500.3 Clause 7.4.1. This includes not just the pipe, but any walls etc. that may conceal the drain.
• Use a geo-fabric over the gravel fill to capture sediment from decomposing the stone above.​​​​​​​

Below grade membranes must:

• Be in accordance with the membrane selection chart
• Withstand the water pressure exerted as a result of hydrostatic head pressure created by water.
• Provide an effective barrier to the passage of liquid water and water vapour from the ground.
• Be able to resist the passage of moisture into the building.

Application

• Dry facing walls placed in front of cut rock faces.
• Loose and friable rock must be removed before covering over. A piece of fractured rock falling against the wall will “wick” water from the cut face and result in damp patches.
• Projections that may allow water to drip from height and splash onto the back of the wall must be removed.

Multiplex Standard Details

​​​​​​​17601 - Basement Details - Waterproofing Grade 1/2 -Typical Section - Detail References
17602 - Basement Details - Waterproofing Grade 1/2 -Drained Cavity - Vertical Section
17603 - Basement Details - Waterproofing Grade 1/2 – Base of Wall Detail - Preferred Option
17604 - Basement Details - Waterproofing Grade 1/2 – Base of Wall Detail - Alternate Option 1
17606 - Basement Details - Waterproofing Grade 1/2 -Intermediate Basement Floors
17608 - Basement Details - Waterproofing Grade 1/2 -Drained Cavity - Base of Wall
17609 - Basement Details - Waterproofing Grade 1/2 -Intermediate Floor Spoon Drain - Transverse Section At Waste
17617 - Basement Details - Waterproofing Grade 3 -Typical Section - Detail References
17618 - Basement Details - Waterproofing Grade 3 -Pile Cap Details - Plan
17619 - Basement Details - Waterproofing Grade 3 -Pile Cap Details - Part Section
17620 - Basement Details - Waterproofing Grade 3 -Section at Base of Lift Pit - Option 1
17621 - Basement Details - Waterproofing Grade 3 -Section at Base of Stair Shaft or Similar - Option 2
17622 - Basement Details - Waterproofing Grade 3 -Plan at Intermediate Slab on Ground
17623 - Basement Details - Waterproofing Grade 3 -Pipe Penetration Installation Details
17624 - Basement Details - Waterproofing Grade 3 -Completed Pipe Penetration Details
17625 - Basement Details - Waterproofing Grade 3 -Formwork Tie Details
17626 - Basement Details - Waterproofing Grade 3 -Wall Joints
17627 - Basement Details - Waterproofing Grade 3 -Floor Joints

Document Control

Version 02 November 2020