What Is a Roof-Over? A roof-over is when a roofing company installs new shingles directly on top of the old ones — instead of tearing everything off and starting fresh. It skips the full tear-off step, so there’s less labor, less mess, and usually a lower price tag upfront. Sounds good, right? Well… not so fast.

Here’s the deal: when shingles are installed in cold temperatures, the tar strip underneath doesn’t seal properly. If installed in cold temps, shingles can fail to seal—leading to premature wear, blow-offs, leaks, and yes, even voided warranties from the manufacturer. No thank you.