If you’ve been consulting roofing contractors regarding your upcoming roof replacement, you may have already been asked if you want a roofing tear-off or an overlay. Both options have their pros and cons, all of which you should consider before making your choice. Here’s a quick look at both installation methods.
An overlay installation basically involves installing a new roof over the old one. A waterproofing barrier is installed over the old one, and – with a few slight differences in the process – the rest of the roof is installed. Homeowners on a budget choose this method because it doesn’t involve tear-off costs. It also generates less waste, and the faster installation time can be favorable if time is a factor.
However, choosing overlay installation has its setbacks. Since the old roof won’t be torn off, it wouldn’t give your roofer the opportunity to address underlying issues your roof may have – trapped moisture in the roof deck would remain trapped. The roofing contractor has to be 100% sure of the roof’s condition before installation. Also, changes to the roof structure as well as your choice of roofing materials would be limited to what your current roof can accommodate. In some areas, installing a new roof over an old one is not legal.
A tear-off installation, on the other hand, involves stripping the old roofing material down to the roof deck, in what essentially is a “clean” installation. This allows roofing contractors to fully address roof deck and attic insulation issues, something that can’t be done with an overlaid roof. This process gives you more flexibility over your choice of materials – you can switch to heavier materials like slate or tile – as well as upgrade components like ridge vents.
It should be noted that the tear-off process can increase the installation costs, especially if parts of the roof deck need to be repaired or replaced. There may also be disposal costs involved. Tear-off installation may also increase installation time by another day or two.
To learn more about the pros and cons of each installation method, call CMS Roofing, one of the best roofing companies in South Carolina, at (803) 732-5558. You can also fill out our contact form to schedule a free consultation. We serve many areas in and near Columbia and Charleston, SC.