ForConstructionPros.com

Wacker manufactures four roller models. The smallest of the four fall into the 1-ton and 1 ½-ton categories. The largest is a 2 ½-ton unit with a 39-inch drum. "A 1 ½-ton roller is still fine for driveways, but going to a 2 ½-ton machine would be too much in most parts of the country," Conrardy points out. "The mix used for driveways generally is for lighter loads and has finer aggregate, and the larger machines have too much weight for that material."

He goes on to explain that Wacker's large roller gives the operator added versatility over its smaller counterparts. He says each vibratory drum offers a choice of high or low compaction force to fit a variety of conditions and applications. The lower centrifugal force is ideal for asphalt conditions whereas the higher centrifugal force is better suited for work in granular subbases.

Both Monical and Sirmons emphasize that drum vibratory versatility is one of the benefits that comes with larger machines. All their midsize units feature independent drum vibration to match the application and water systems that keep the drums free of asphalt buildup.

Payback time

Before upgrading to a larger roller, Conrardy says contractors should ask themselves if there will be enough work to justify going to a bigger machine.

"They should ask themselves how long will it take to payback the incremental difference in price with additional work. If the time frames and upgrades are worth the extra work that can be done, then the answer is 'go for it.'"