Seal Coat Process Steps

Seal Coat Process

Step 1 – Crack Sealing
Approximately midway through the ten year seal coat cycle a liquid elastomeric material is poured into any visible crack in the pavement.
Step 2 – Repair Work
Prior to seal coating streets and structural damage to the street will be repaired by City crews.
Step 3 – Door Hangers
About a week before a street is to be seal coated, the Street Department will place door hangers on the front door of all residence that front on that street.
Step 4 – Power Brooming
Within 24 hrs before the liquid asphalt and rock are applied the streets are swept off to remove loose materials and debris that could inhibit the asphalt from sticking to the pavement surface. 
Step 5 – Flagmen
Prior to a street being treated safety flagmen are positioned at key points along the route to direct traffic and maintain a safe work zone for the public and the workers. For your safety and the protection of your vehicle carefully follow the directions of the Flagmen.
Step 6 – Application of Liquid Asphalt
A thin layer of hot liquid asphalt is sprayed on the pavement surface.
Step 7 – Application of Pre-coated Gravel Rock
Immediately following the application of the liquid asphalt is a piece of equipment called a “Chip Spreader”. The purpose of the chip spreader is to evenly distribute the pre-coated rock over the liquid asphalt area. The chip spreader has the ability to control the amount of rock being released to minimize waste. The chip spreader is large and bulky by itself, but when a dump truck full of rock is attached to the back of it to supply the pre-coated rock “driving” it is a challenge. For this reason, you are asked to move any vehicles you may have parked in the street.
Step 8 – Rolling
The application of the liquid asphalt and pre-coated rock usually requires three passes to completely cover the full width of a residential street. Once the full width of the street is coved with the Pre-coated rock a couple of “rubber tired rollers” will drive back and forth over the rock to press the rock securely into the liquid asphalt. The rubber tired rollers are very heavy and apply a great deal of pressure to the road surface to accomplish this task.
Step 9 – Power Brooming
Usually, the following day a power broom will return to sweep the loose rock over to the sides of the roadway. This slow moving vehicle will make multiple passes up and down a street to remove the loose rock from the primary travel path of the street and to move the loose rock to an area where the street sweepers can readily pick it up and to minimize traffic disruption. 
Step 10 – Street Sweeping
About one week after the streets are power broomed a street sweeper will be scheduled to come by and pick up the loose rock that accumulated along the sides of the street.