May Present Long-Term Problems – Since you’re not tearing off the old roof, your roofer can’t check for any issues happening under it. Putting another roof on top of the old one makes it harder to detect and fix any problems in the future.
Could Affect Your Reale Value – Homebuyers don’t want to see an overlay roof, because most of the time that means they’ll have to replace it.
Is More Difficult to Replace – Once you’ve got two sets of shingles on your roof, your replacement cost seriously increases. The next time your roof needs to be replaced, your roofer will have to tear off both sets of shingles, which will cost extra in labor.
Could Negatively Impact Curb Appeal – You’re putting a new roof on top of an old roof, but that doesn’t mean you’re fixing any problems. If your existing roof had settled and sags in some areas, those are likely to show through in the new roof, too.