The installation of a secondary layer of asphalt shingles on top of your existing roof is typically referred to as a reroofing service. Reroofing can be more affordable than having your roof replaced entirely, but it does have its downsides.
The majority of local building codes and regulations in California only allow up to two layers of roofing shingles to be installed at any time. That means that if you’ve already had your roof re-roofed and are still having problems, your only other option is to have it replaced.
When it comes to complexity, a reroofing project ranks high on any professional roofers list. This is because a roofing assessment must be completed to ensure that a second layer of asphalt shingles hasn’t already been installed and that the existing layer is damaged beyond repair.
Once this has been done, the actual process of removing and disposing of the existing roofing begins.