Cities are, generally speaking, hotter places to live than more spread out suburban or rural areas. The main culprit for this is something called the heat island effect, which is a fancy way of saying that heat tends to linger in cities, making them hotter than the surrounding area. A big part of the heat island effect is just how much pavement makes up an area, because impermeable pavement grabs heat, and holds it, only cooling off reluctantly. Permeable pavement, on the other hand, can reduce an area's lingering heat, allowing it to cool off more quickly.
How Does It Do That?
Porous paving allows water to drain through it naturally. As the water drains, it cools the pavement in ways it wouldn't if it was forced to pool on top of the pavement, or if it simply sluiced off to one side. There is also the added cooling factor which occurs when water evaporates back up through the voids in the paving, called the wicking effect, the evaporating moisture water continues to cool the air and paving. If the permeable paving in question is also a lighter colour (black holds heat, while lighter colours reflect more of it back), then there will simply be less heat radiating from the pavement. Even on bright, sunny days.
Given that temperature control is an important consideration when it comes to paving, this feature is one landscapers and property owners should take into account. Especially alongside porous paving's lack of additional drainage requirements (since the pavement drains naturally), its aesthetics, and its longevity as a building material.
For more information about porous paving, and for help deciding if it's right for you and your project, simply contact us today!
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