A new roof in Leander is a chance to fix attic heat. Ventilation, shingle color, radiant barriers and hail ratings that help hot upstairs rooms.
Climb into a Leander attic at four in the afternoon in August and you'll see why the upstairs bedrooms never cool off. The air up there can run well past 130 degrees, the roof deck radiates heat downward like a griddle, and the AC ducts snake right through the middle of it.
A roof replacement won't fix all of that on its own, but it's the one time the whole roof is open and easy to change. Leander's mix of newer two-story homes, hail in the spring and a summer that seems to last until October makes it worth planning the job around attic heat as much as shingle style.
The sun heats the shingles, the shingles heat the decking, and the decking radiates that heat into the attic. From there it soaks into the insulation and the ceiling below, and into any ductwork running through the attic. The hotter the attic, the warmer the air coming out of the upstairs vents, and the longer your AC runs.
Three parts of a roof job change that: ventilation, roof color and what happens under the decking.
Good attic ventilation pulls cooler air in low at the soffits and lets hot air out high at the ridge. A lot of homes have plenty of exhaust and too little intake, often because soffit vents got painted over or blocked by insulation. Without intake, exhaust vents can't do their job.
A couple of rules installers follow:
Darker shingles absorb more heat. Lighter colors and shingles made with reflective granules, often sold as cool roof shingles, keep the roof surface cooler. They won't make a dark attic cold, but they take some edge off. If your HOA allows a lighter color range, consider it.
Metal roofing with a reflective painted finish goes further, bouncing back a large share of sunlight. It costs more up front and lasts much longer than shingles, often 40 years or more.
A radiant barrier is a reflective foil layer that blocks much of the heat the roof deck radiates downward. During a reroof, it can go on as radiant barrier decking (foil bonded to the sheathing) or be stapled to the rafters from inside the attic. Either way, it can lower attic temperatures noticeably on summer afternoons.
Insulation is the other half. ENERGY STAR generally recommends about R-38 to R-49 in Texas attics. Many older and builder-grade homes have less, especially after years of settling or technicians crawling through to reach the AC.
Heat wears shingles down slowly, but hail is what usually forces a replacement. When you choose new shingles, ask about impact-rated ones, rated Class 4 under the UL 2218 test. Some insurers discount premiums for them. After any hail storm:
A cooler roof does even more for the upstairs when the glass gets better too. Our page on Leander windows covers tall sunny windows, and doors in Leander covers entry door glass and seals. For everything else we do locally, see our Leander page.
Texas Energy Pros can measure your attic insulation, check the ventilation and look for duct leaks during a free home energy audit. Request one through our contact page.
