Most of the sealed roads in the Whangārei district have a chip seal surface which is stone chips embedded in a layer of bitumen.
The seal on a road is like paint on your house - it keeps water out of the structure underneath. Like paint, the seal breaks down over time and starts to let water in.
When the surface of a street starts to break down it is time to reseal. The ideal time to reseal is just before any damage occurs, so your road may still look to be in good condition. We aim to keep it that way.
Resealing involves the following:
- minor repairs are carried out prior to resealing
- the resealing contractor will contact residents in the street about a week before work begins
- hot bitumen is sprayed and stone sealing chips are spread and rolled in
- excess sealing chips are swept away and road marking is reinstated within 48 hours
- as many as three additional sweeps may follow in the next six months.
Road renewal covers the reconstruction and strengthening of the road surface and layers and can include realignment and widening.
Road renewal is undertaken when road surfaces become potholed, cracked, develop corrugations and rutting or the road subsides.
All roads reach a point where it is more economic to renew them than to continue to repair.
A programme of resealing and renewal work is usually determined at the beginning of each financial year and contracts are awarded through a public tendering system.
Drainage improvements are usually undertaken as part of road renewal works.