Had the same thing happen after a layover—my attic felt like a sauna all summer. I tried adding more vents, but honestly, it barely made a dent. If I had to do it again, I’d bite the bullet and tear off the old stuff. That heat just lingers forever with two layers.
I get where you’re coming from, but I’m not totally convinced that a full tear-off is always the answer for attic heat. I had a similar setup—old three-tab shingles, then a new architectural layer on top. My attic definitely got warmer, but after I beefed up the insulation and sealed up some air leaks around the hatch and light fixtures, it made a bigger difference than I expected. The vents helped a bit, but honestly, stopping the hot air from getting into the living space was what really mattered for comfort.
I know two layers can trap more heat in the roof deck itself, but if your insulation’s solid and you’ve got decent airflow, it might not be as big of a deal as people say. Plus, in my area (Midwest), winters are brutal, so that extra layer actually seemed to help with ice damming—less heat escaping through the roof.
That said, if your old shingles are curling or there’s any sign of rot underneath, then yeah, tear-off is probably smarter long-term. But if the structure’s sound and you’re just worried about attic temps, maybe try boosting insulation first? It’s way less hassle and cost than a full removal.
Just my two cents—sometimes it feels like everyone jumps straight to “rip it all off,” but there are other ways to tackle the heat issue.
“sometimes it feels like everyone jumps straight to ‘rip it all off,’ but there are other ways to tackle the heat issue.”
- Walked into an attic last summer, two layers of shingles, felt like a sauna. Owner was ready to go full demo... but turns out, their insulation was about as thick as a pancake.
- Added a foot of blown-in, sealed up the can lights, and—no joke—temps dropped 10+ degrees.
- Tear-off is great if you’ve got rot or wild curling, but otherwise? Sometimes it’s just overkill (and your wallet cries).
- Midwest winters: that double layer can be a weird blessing for ice dams, like you said. Just watch for trapped moisture sneaking in.
- My rule of thumb: check the deck, beef up the fluff, THEN think about going nuclear.
“Tear-off is great if you’ve got rot or wild curling, but otherwise? Sometimes it’s just overkill (and your wallet cries).”
Couldn’t agree more. I almost got talked into a full tear-off last year, but after poking around the attic and checking the deck, all I really needed was better insulation and some vent tweaks. Saved a ton. Unless there’s real damage, I’d rather patch what’s needed and keep the cash for something fun... or, you know, the next home surprise.
That’s a smart move. I’ve seen a lot of folks get pressured into full tear-offs when a little detective work would’ve saved them thousands. Unless you’re seeing soft spots or major leaks, it’s amazing what a bit of insulation and ventilation can do. I did something similar—just replaced a few shingles and added ridge vents. The attic’s way cooler now, and my wallet’s happier. Sometimes the “big fix” isn’t really necessary, especially if the decking’s still solid.
