If bees have built a hive on your roof, they have done so over a period of time, and you have probably not paid attention to this constant activity of the bees, and are now faced with a problem of bee removal from roof.
Bee hives are often formed in attics or can hang down in crawl spaces or under eaves. This has probably been the result of both these spaces not having been inspected or looked at over a long period of time. The best way to remove the hive from the roof is to open it up, and is a thing that most homeowners are loath to do, especially if the roof is new and recently installed. You can always crawl into the attic or crawl space and try to remove the hive, but this is not the best way for effective removal.
The reason for this is that going into these spaces is dangerous and rarely has stable footing. These spaces can also contain water pipes, electrical wires that can impede free movement, or get damaged with the frantic activity that bee removal requires. Attics are also never properly ventilated and can be hot, leading to the chances of the person removing the hive to suffer from heatstroke. Most technicians involved in bee removal will wear bee suits that are quite bulky and difficult to move in, making the work of visiting the attic or crawl space a not very comfortable one.
Bee removal from roof must be undertaken as soon as the problem is noticed, as over time, hives will become bigger and thus more difficult to remove. Many people simply have the bees killed but do not remove the hive. If you do this, the chances are that a new swarm will take over the old hive, and you are back to having the problem as before. The smell of hive material attracts bees who will then re-infest it, or build a new hive next to the old one.
Bee removal is best left to pest control companies who specialize in bee hive removal. They are the agencies that will have the right equipment and the proper experienced technicians who can use them. To start the process of bee removal it is essential to identify the location of the hive, and for this, you need to identify the place from where the bees enter your roof, attic or crawl space. You need to then remove the tiles or shingles at this location without damaging the roof in any way. You will then have to remove all the other roof coverings, like tar paper or plywood that form the supporting layer for the roof, and expose the hive.
Then comes the difficult job of removing all the bees and also scraping out the wax and honeycomb that you will find inside it. You will then need to apply a primer to all these areas as this will reduce the scent of the pheromones that will attract other bees.
See if you can screen off the entry point so that bees cannot enter again, and then repair the area of the roof that you had damaged in order to gain access to the hive.