Driveway Invert and Crossover 221 Form

• Vehicle inverts are three metres wide for a single driveway or up to five metres wide of a double driveway. Requests for inverts greater in length may be considered but will require separate approval from Council’s Assets & Delivery Department.
• Inverts width should not exceed 30 per cent of the frontage of the site.
• If the property is below the road level, the crossover must have a crest that is at least 100 mm above the top of kerb before reaching the property boundary. Otherwise, the finished level of the crossover at boundary must be a minimum of 100 mm above the top of kerb level.
• The maximum gradient of a driveway shall be 5% between a footpath and invert, 2.5% across the footpath and 20% within the property. In accordance with AS 2890.1, changes in grade shall not exceed 12.5% (1 in 8).
• The Infrastructure Guidelines SA provided by the Institute of Public Works Engineering Australasia includes additional standard drawings for blocked paved driveways and longitudinal sections.

• Inverts & crossovers may not be constructed within 10 metres of an intersection and within two metres of a kerb ramp.
• Inverts & crossovers must be wholly situated within the property frontage boundary.
• Inverts & crossovers must be built at least one metre from stobie poles and stormwater entry pits.
• Inverts & crossovers must be located a minimum of two metres and sufficiently away from street trees as determined by Council’s Senior Urban Forest Officer. This distance may be increased depending on the tree’s size, age, condition, structure, canopy and health. For any new driveways constructed under existing tree canopies, applicants are advised that trees will not be pruned to the detriment of the tree’s health and longevity.
• Approval for the street tree to be removed, replaced, or relocated will be at the discretion of the Senior Urban Forest Officer and all costs associated (including tree removal, planting and establishment of a suitable replacement) will be charged back to the Applicant as per the Tree Management Policy.
• No street furniture (e.g. street signs, traffic signs, Telstra infrastructure, etc.) may be removed for the purpose of providing an invert & crossover except with the express approval by the Council’s Assets & Delivery Department and any other relevant authority.

• The driveway crossover is to be non-slip with a brushed finish, concrete aggregate, paver or asphalt. The crossover may extend from within the property, over the property line, to the invert at the road.
• Any disused invert & crossover must be reinstated to kerbing, footpath & verge at the time the new invert and crossover are constructed.
• Concrete kerbing must be saw cut for the installation of a new invert. It is not acceptable to break out the kerbing without cutting first and the entire kerb and water table must be excavated prior to construction.
• Invert profile must conform to AS2876 and be poured integrally with the water table. All inverts require F72 reinforcing mesh placed centrally in the concrete.

Concrete

• Minimum thickness of the concrete must be 100 mm, except for non-residential property which requires a minimum thickness of 150 mm.
• Base must be of compacted quarry rubble minimum 100 mm thick.
• Ready mix must comply with AS1379 and have a minimum compressive strength of 25 MPa and a maximum water/cement ratio of 0.5 or slump of 100 mm, except for non-residential property which requires a minimum compressive strength of 32 MPa. Hand-mixed may not be used unless it complies with AS1480.
• Non-residential properties require F72 reinforcing mesh placed centrally in the concrete slab.
  
• Surface finish: inverts – smooth steel trowel. Crossovers – broom finish or wood float. Note: a smooth steel trowel finish is not acceptable on crossovers.

Paving bricks or blocks

• Interlocking type bricks or blocks minimum of 60 mm thick to be used for residential properties. Non-residential properties require a minimum of 80 mm thick interlocking type bricks or blocks.
• Bricks or blocks must be bedded in sand bedding a minimum of 20 mm thick spread on a base of compacted quarry rubble a minimum of 75 mm thick for residential properties. Base of compacted quarry rubble for non-residential properties must be a minimum of 150 mm thick.
• Edges must be restrained by a concrete retainer in accordance with established good practice.

Asphalt

• Minimum thickness for residential properties is 30 mm asphalt compacted. Non-residential properties minimum asphalt thickness is 40 mm.
• Residential properties require a 100 mm minimum thick base of compacted quarry rubble. Non-residential properties require a 150 mm thick base of compacted quarry rubble.
• Hot mix asphalt must be laid at temperature within 4˚C of supply temperature and in accordance with good practice.
• An approved bonding agent must be applied to the base material and allowed to cure in accordance with suppliers’ recommendations, prior to laying asphalt.