It’s July. Your attic hits 160 degrees. That heat radiates down into your living space all day and night. A radiant barrier reflects 97% of it back toward the roof. Your attic drops 30 degrees. Your AC stops running constantly.
Here’s the thing most people don’t realize: regular insulation doesn’t stop radiant heat. It slows conductive heat (stuff touching stuff) and convective heat (air moving around). But radiant heat? That’s what you feel when you stand in the sun. It travels through your roof and radiates into your attic like a space heater pointed at your ceiling.
Radiant barriers are basically giant sheets of aluminum foil. They reflect that radiant energy back toward the roof before it can heat up your attic. Simple concept, huge impact.
Almost all of it. That’s not marketing – it’s physics. Aluminum reflects infrared radiation extremely efficiently.
We’ve measured this in Los Angeles homes. A 155-degree attic becomes a 125-degree attic. That’s the difference between an oven and merely hot.
Your AC doesn’t have to fight a 160-degree ceiling anymore. It cycles less, your bills shrink, your compressor lasts longer.
There’s nothing to replace, nothing to inspect. Once it’s up there, it just works. We’ve seen 30-year-old installations still performing fine.
Real results for Los Angeles homeowners
Everyone loves Los Angeles’ weather. But all those sunny days mean your roof absorbs heat from sunrise to sunset. By 2pm on a summer day, your roof tiles hit 150 degrees or more. That heat doesn’t just stay in the attic – it radiates down into your bedrooms all afternoon and well into the night.
Homeowners in Adams Hill and Chevy Chase know this problem well. Those hillside homes catch even more direct sun. A radiant barrier reflects that energy before it can turn your attic into a furnace.
Radiant barriers weren’t standard practice until the 1990s. That means homes in Rossmoyne, Verdugo Woodlands, Montecito Park, and most of Glenoaks Canyon were built without them. They’ve got some insulation, sure – but nothing to stop radiant heat.
The good news? Adding a radiant barrier to an existing home takes one day. It’s non-invasive. And you’ll feel the difference that same week.
Those brutal July weeks when it’s triple digits? Your attic hits 155-165 degrees. We’ve measured it. At that temperature, your AC can’t keep up no matter how hard it runs. The heat just keeps radiating down through your ceiling.
Drop that attic temp by 30 degrees and suddenly your AC isn’t fighting an impossible battle. It cycles less. Your upstairs bedrooms stay comfortable. Your August SCE bill doesn’t make you wince.
They solve different problems. Together, they solve all of them.
One day. Start to finish. You’ll notice the difference that same week.
You've got insulation - great. But it's only doing half the job. Insulation slows conductive heat. Radiant barrier stops radiant heat. They're solving different problems. The best-performing attics in Glendale have both. We install the barrier on your rafters, so your existing insulation stays right where it is.
Works great with tile. Actually, tile roofs get hotter than shingle roofs - all that thermal mass absorbs heat all day. Spanish tile is beautiful, but it turns your attic into a brick oven. The radiant barrier doesn't care what's on top - it reflects the infrared energy radiating from the underside of your roof deck. Tile, shingle, metal, flat roof - all good.
Physics. A radiant barrier reflects infrared radiation - but only if there's air between the barrier and whatever's below it. If it touches your insulation, heat transfers through contact (conduction) instead of bouncing back. We need at least 3/4 inch of air gap. That's why we staple it to the rafters instead of laying it on the attic floor.
It would if we installed it wrong. Here's the trick: we put the shiny side facing DOWN. Dust can't settle on an upside-down surface. Gravity's on our side. The reflective surface stays clean forever. Contractors who staple it shiny-side-up are making a mistake - those installations lose effectiveness over time.
Honestly? Yes. R-38's solid, but your attic still hits 150+ degrees in summer. That heat stresses your insulation, bakes your ductwork, and radiates down all day. A radiant barrier drops that attic temp by 30 degrees. Your R-38 works better. Your ducts stop leaking cool air into a furnace. Your stored Christmas decorations stop melting. It's worth it.
