Heat Mat has provided a sophisticated driveway heating system for Northway House, a modern reworking of a 1970’s office block on the outskirts of London.
Northway House residents require carpark access all year round, especially when parking is at a premium in London. When new asphalt is being laid a ramp heating system is a popular solution to avoid damage and discolouration from the use of salt or grit on the drive in winter. This system prevents any frost or snow on the underground parking ramp.
10mm driveway heating cables were specified to heat the ground underneath the asphalt. Due to the size of the drive, tyre tracks were marked out and heated by 300W/sqm mats instead of heating the entire driveway. This ensures power consumption is kept to a minimum instead. Each track was 100m in length, stretching along the drive allowing access to three underground parking entrances. Bespoke heating mats with an output of 300W/sqm were manufactured off-site.
In order to compact the asphalt, a heavy roller was used. This meant the heating system could not be close to the surface due to the potential for damage and so a layer of 50mm thick asphalt had to be above the cables. To enable the system to heat this layer the cables were laid at an increased wattage of 300W/sqm allowing additional cable loops to be included for strength, and to shorten the distance in-between the cable runs ensuring that the heat spread effectively in the asphalt.
The mats are controlled by both air and ground temperature sensors, along with a moisture sensor to monitor surface water levels. The intelligent controls will only activate the system should the temperature drop to a certain level or moisture pose a risk of dangerous conditions, avoiding expense and environmental damage.