How We Installed a Roof-Mounted Turbine Vent on a Glendale Garage

When our client reached out, the complaint was simple:

1. Inspection & Layout

• We evaluated the truss framing from inside the attic, confirming there was enough clearance for a 12-inch duct and no conflicts with wiring.

• The ideal vent point was marked just below the ridge line, where rising hot air naturally collects for maximum draw.

2. Cutting the Interior Opening

• After tracing the circle on the vapor-barrier membrane, we drilled a pilot hole, then used a jigsaw to cut a clean round opening through the roof sheathing.

• A supply-air ceiling grille was fastened immediately, preventing insulation from falling and giving us a solid flange to marry the duct later.

3. Roof-Top Preparation

• Working from the pilot hole, we removed surrounding shingles, then cut an identical hole through the plywood decking.

• A galvanized transition sleeve was dry-fitted to verify it cleared the rafters and sat flush.

• We applied Henry® asphalt sealant under the metal base, set it with roofing screws and EPDM-backed washers, then lapped surrounding shingles over the top edge so water would shed properly.

4. Turbine & Duct Assembly

• An adjustable galvanized duct was inserted, pop-riveted, and sealed at every joint.

• Up top, we leveled the turbine to ensure free rotation and locked down the collar bolts.

• Inside, the duct was secured to the ceiling grille with foil tape and we test-spun the vanes—one light breeze and the rotor turned smoothly.

5. Weatherproofing & Quality Check

• All seams received a final bead of asphalt mastic, and the exposed metal base was wrapped with self-adhesive butyl-aluminum flashing.

• We ran a 20-minute garden-hose spray test—no drips, no staining inside.

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Results for the Homeowner

• Up to 10 °F (≈ 5–6 °C) cooler inside the garage on the very first evening.

• Zero energy cost: the turbine runs on wind and natural convection.

• Longer roof and tool life: humid, stagnant air no longer condenses on metal surfaces.

• Warranty: 2 years on workmanship and seal-integrity, 15 years manufacturer warranty on the turbine.

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Thinking About Better Ventilation?

Call or text 818-401-7766 or email info@prohandshandyman.com.

We’ll inspect your space at no charge, recommend the right turbine size, and install a fully weather-tight vent—usually in just one day.

ProHands Handyman – complete ventilation, roofing, and renovation solutions in Glendale, Burbank, Pasadena, and nearby areas.