The radiant barrier and insulation combo probably does more heavy lifting than shingle color alone.
I’ve seen the same thing over and over. Had a client swap to Malarkey’s lightest shingle hoping for a big drop in attic temps, but with their old batt insulation and minimal soffit vents, it barely made a dent. Meanwhile, another place with darker shingles but upgraded spray foam and ridge vents stayed noticeably cooler. Shingle color helps a bit, but if your ventilation or insulation isn’t up to par, you’re not going to see huge gains just from switching brands or shades.
Been down this road myself, chasing the “cool attic” dream. I thought about splurging on fancy shingles too, but honestly, the biggest difference for me came after I shoved a bunch more insulation up there and finally got around to unblocking those soffit vents (who knew birds could be so determined?). My neighbor’s got darker shingles, but his attic stays way cooler just because he’s got spray foam and a decent ridge vent. Shingle color’s not magic… it’s more like the cherry on top if you’ve already fixed the real issues.
- Gotta push back a bit on “shingle color’s not magic.”
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Shingle color’s not magic… it’s more like the cherry on top if you’ve already fixed the real issues.
- Sure, insulation and venting matter most, but in hot climates, light-reflective shingles can drop attic temps a few degrees.
- Not a game-changer alone, but it adds up—especially if you’re already re-roofing.
- Personally, I went with a “cool roof” rated shingle and noticed my AC ran less last summer.
- Birds in the vents though... yeah, been there.
I went down the Malarkey rabbit hole last year when my old shingles started curling up like potato chips. Ended up picking their “cool roof” ones too, mostly because my attic used to feel like a sauna in July. I won’t say it’s night and day, but I did notice the upstairs wasn’t quite as brutal. Still had to crawl up there and chase out a couple of birds though... apparently they don’t care what color the shingles are. If you’re already re-roofing, I’d say the extra few bucks for the reflective ones is worth it, but yeah, insulation and venting are still the heavy lifters.
Cool roof shingles can definitely help, but I’d agree—ventilation and insulation are usually the bigger factors in attic temps. I’ve seen folks swap out regular asphalt for reflective shingles and get maybe a 5-10 degree drop upstairs, which helps, but it’s rarely a total fix if the attic’s not breathing right. Sometimes people expect miracles just from the shingle color or coating.
One thing I’m curious about: did you check your soffit and ridge vents while you were up there chasing birds? I’ve run into a bunch of houses where the vents are blocked by insulation or just undersized for the space. Even with “cool” shingles, if the hot air can’t escape, it’ll still cook up there.
If you’re already re-roofing, it’s a good time to double-check all that stuff. Also, what’s your climate like? In really humid places, sometimes folks add powered vents or even radiant barriers under the decking. Not always necessary, but sometimes worth it if you’re fighting both heat and moisture.