Porous Concrete And Asphalt For Sloped Driveway Drainage


A garage located down a slope from the road tends to have problems with driveway drainage. Relatively new options for homeowners include porous asphalt and concrete that allow water to drain through. If you plan to have a house built on this type of land, learn more about options for sufficient driveway drainage.

The Importance of Adequate Drainage

Standing water on pavement low spots reduces the longevity of the driveway. In addition, water runoff takes the path of least resistance. On a driveway that slopes down toward a garage, some of that water will travel toward the building, even if the driveway is constructed with a slight rise in the middle throughout its length.  

About Porous Paving 

You may see these materials advertised as porous or permeable asphalt, or porous, permeable or pervious concrete. The terms all mean essentially the same thing -- a type of paving that has good drainage instead of a hard surface that holds water in low spots or leads to runoff.

Gravel paving is another porous option, but it requires maintenance to keep the stones in place. Especially on properties where driveways have a definitive slope, gravel may be inadvisable because it rolls downward. 

Porous Concrete

Both porous and traditional concrete are made of Portland cement -- usually from limestone -- and stone aggregate mixed with water. Traditional concrete also contains sand, whereas porous concrete does not. Without that fill material, the concrete has a large number of tiny holes that allow water to drain through. 

Porous Asphalt

Traditional asphalt contains a smaller amount of cement than concrete does. The cement is petroleum based, giving asphalt its tarry black color and sticky characteristics. Like concrete, traditional asphalt includes stone aggregate and sand or other fine material. Permeable asphalt contains a much lower amount of sand or fine material, which allows water to drain through. 

Paving contractors pour the top layer of porous asphalt over a bed of crushed stone to increase drainage and support the upper layer. Asphalt is more flexible than concrete under vehicle weight and needs the extra support. 

What You Can Do Now

Contact paving contractors like B A Dawson Blacktop Ltd in your area to learn more about porous asphalt and concrete and to get quotes for the size of your driveway. Since these two materials look entirely different, you may have a preference from a decorative standpoint. Either way, you'll solve most -- if not all -- of your driveway drainage problems with these materials. 


6 August 2015

tips for planning a driveway paving project

How much time do you spend each spring raking the gravel from your driveway out of your drainage system or lawn? This was one spring cleaning project that really aggravated me. That was until I had my driveway paved. After the driveway was paved, I was able to spend my time during the early spring and after heavy storms doing things that I actually enjoyed doing or that needed to be done. If you are considering having your driveway paved, this blog can help you make the decisions that need to be made during the planning process to find the perfect solution to your driveway problems.