Every roofer uses some type of tar products while installing your roof. This stuff is messy and tends to get anywhere and everywhere once they start spreading it. Your driveway or on your porch are the most likely locations you are going to notice tar blobs, tar foot prints and tar smears. This stuff does not dry quickly and is very easily tracked everywhere once it is stepped in.
You can be sure that this is going to happen somewhere around your home during the roofing project. You should also expect that the roofer stays alert to this and cleans anything the tar falls on immediately. This is the only way to limit the spreading and tracking. It is easy to cleanup with the chemicals the roofer should have on hand.
The good roofers always have the right materials to use for this type of cleanup. As mentioned earlier, a worker assigned to the ground for observation as well as supervision is the man that should remove any tar that drips or tracks across your property. He should be alert to every occurrence and immediately clean the affected area to eliminate spreading.
If smearing or staining occurs on your paved areas, your roofer must repair the damage. An excellent way to accomplish this is to require a pressure washing of the area after the roof is complete. This can remove any of the discoloration and restore your property to an acceptable state. Most roofers have the equipment and have successfully used it in the past but if they don't, they will need to hire a pressure washer to take care of this before the final payment is made.