Several factors may allow us to place a new roof over the existing one. Local and national building codes outline roofing requirements that we must follow, however. If the law allows you two roofing systems, we must carefully consider the current structural condition, underlying insulation, deck conditions, and moisture saturation to determine if removal of the existing roof will be more cost effective in the long run. If your existing roof is damaged, saturated, or unstable, we will need to strip the existing roof to install a new roof.