Roof Dryer Vent Cleaning in Manhattan Beach, CA

Why does a roof-vented dryer clog faster than a wall vent?

Gravity, mostly. A roof run climbs instead of going out. When the cycle ends the blower stops, and lint still suspended in the pipe falls back down into the elbows. Long second- and third-floor runs through interior walls in coastal rebuilds and townhomes stack several turns before daylight. Every turn is a shelf. That is why these get cleaned annually while a short straight run behind a garage dryer can wait 18-24 months.

The cap is the other half of the problem. Plenty of roof caps went on with no bird screen. Nests show up in spring. Salt air stiffens the damper flap so it stops swinging fully open, and lint packs the hinge.

Most of the brushing happens from inside the house. Rotating brush on rods, fed up the duct from the dryer connection, vacuum held at the appliance so nothing dumps into the laundry room. The termination is cleared from above. Roof type dictates the approach (flat torch-down is straightforward, tile is not).

Some runs should not be brushed at all. A crushed or vinyl duct, or one that dead-ends in attic space, needs rework, not a cleaning.

Two and three cycles per load is the usual reason people call.