There’s more than 262,000 miles (422,000 km) of roadway in the UK. No wonder the plain black tarmac surface is a familiar sight to us all.
Effects of Weather
The bewitching smell of hot tarmac that rises from the road on a scorching hot day can evoke memories of past summers.
However, the fact that we can smell the tarmac is not really a good thing. In an ambient temperature of 30°C, and in direct sunlight, tarmac can reach a temperature of 50°C. That’s when it begins to melt. In these conditions, indentations from vehicle tyres and feet will make a permanent impression.
Sustained exposure to sunlight will dry out the tarmac, making it brittle, which results in cracking. When ice forms in the cracks, it expands and increases the size of the cracks. Surface ice also presents a slip hazard.
Hot weather is the ideal time to reseal your tarmac driveway. When the sealant is warm, it runs thinly, going deep into the tiny cracks. And the warmer the sealant, the better it will bond with the surface.
Tarmac is not porous, and water will settle on the surface. Therefore, the planning of a new tarmac driveway must include a drainage solution – either a natural slope down to your garden, or a means of channelling water to the garden or a waterway.
Because tarmac is an impermeable surface, a tarmacked area of more than 5m2 isn’t within the parameters of permitted development. However, at Driveline Surfacing, we have plenty of experience in creating simple, cost-effective drainage solutions.