The basic make-up of a tar and chip driveway includes a thick, compacted base of stone aggregate topped with a couple of layers of liquid asphalt and small gravel.
Occasionally I’ll recommend a drive like this on a project, but more often it’s requested by the homeowner. So what’s the attraction with these drives?
Tar and chip driveways (that are built correctly) have some admirable qualities.
- From a design standpoint they do have a certain charm. You can choose just about any color chip (gravel), and have the drive blend more with the landscape rather than compete.
- The sound of a car’s tires on the gravel is an attraction too. The homeowners that request a tar and chip driveway always mention this. Birds and waterfalls aren’t the only sounds in the landscape!
- Long lasting. Asphalt drives eventually become brittle and cracked. Repairs are obvious and replacement is expensive. Tar and chip drives easily outlast them.
- The gravel texture is great for traction. I should mention, however, that if you have snow to remove you need to raise the snowplow blade a bit.
The homeowner that goes for the tar and chip driveway is mostly motivated by the look and sound. But the practical side is compelling too.
A tar and chip driveway will last almost indefinitely if it is built right. Eventually the drive may need a fresh coating of tar and chip.
- The sub-base (or earth) that the drive is built on must be non-organic and well-compacted. Filter fabric is laid down between the gravel base and compacted earth.
- The property’s grading and drainage should be such that no water collects in or near the driveway.
From experience I have learned that a border of some kind helps maintain the edges of any driveway. For a tar and chip driveway a border also helps keep the loose chips (stones) on the drive. The picture at the top has a belgian block border. And to the left is a natural stone border. Both are set on concrete footings.
For certain landscape settings it would be perfectly fine to install the tar and chip driveway without a border. Sometimes you want the more relaxed, seamless look of a driveway without distinct edges
The initial tar and chip driveway should have 2 layers of liquid asphalt and chips (stones). This establishes a more substantial “top” to the driveway from day one.
Although the final coatings of chips are rolled into each layer of liquid asphalt, there’s usually a small percentage of loose chips left on top of the final layer. That’s okay and really adds to the authenticity.
It’s not unusual for some of the loose chips on top to move a bit and gather, particularly where the tires might repeatedly turn. These are the spots where you might have to rake or broom the loose chips back into position once in awhile.
The belgian block driveway apron (in the first picture) is both functional and attractive. As I previously mentioned, gravel driveways can have the problem of “pushed” gravel in areas where tires are turning – like at the entrance. The apron will alleviate that.
I don’t know about you, but with the house pictured above with its cedar shake roof, to me this gravel driveway fits like a glove.
P.S. Tar and chip driveways should not be confused with a conventional gravel driveway. These drives do not have any asphalt ingredient in their makeup, but when built correctly will provide an excellent, low-cost driveway. Check this article out at AskTheBuilder.com on what comprises a well-built gravel driveway.