Weighing the pros and cons: full roof removal vs. just adding a new layer

- Not saying a nail-over is always a bad move. In some cases, it’s actually a decent option—especially if the first layer is still solid and you’re not dealing with a ton of valleys or weird roof angles.
- Midwest weather’s rough, but I’ve seen plenty of double-layer roofs hold up fine for 10+ years, as long as the decking underneath is dry and flat. The key is making sure you really check for soft spots, especially around chimneys, vents, and eaves. Sometimes folks skip that step and regret it later.
- Full tear-off does give you peace of mind, no doubt. But it’s not always in the budget, and sometimes insurance won’t cover it unless there’s visible storm damage. Had a neighbor who did a nail-over after hail—saved a chunk of change, and it’s been leak-free for five years now. He did get up in the attic and poke around first, though.
- One thing to watch: adding a second layer adds weight. Most houses can handle it, but if you’ve got an older structure or a low slope, it’s worth double-checking. I’ve seen sagging rafters from too many layers.
- Mold’s a dealbreaker, for sure. If you spot any, tear-off’s the only way. But if it’s just old shingles and the deck’s solid, sometimes a second layer buys you time to save up for a full replacement down the road.
- Personally, I lean toward tear-off when possible, but I get why folks go the other way. It’s all about what you find once you start poking around under those shingles. Sometimes you get lucky, sometimes you don’t...

I get the logic behind saving money with a nail-over, but I’ve got to push back a bit on the “10+ years” thing.

“I’ve seen plenty of double-layer roofs hold up fine for 10+ years, as long as the decking underneath is dry and flat.”