A Rot-Resistant Chimney Chase, Images 1-10

The house shown here was built just a few years before my crew and I began working on it, but already the paint was peeling from the fiber-cement clapboards, and the corner boards had begun to rot.

When we dug a little deeper, we discovered deteriorated sheathing and rotted framing, too.

Rotting framing

We found that most of the damage had been caused by water from the roof running behind the siding and down the sheathing — the result of some missing step flashings.

When we do a chase repair, we usually rebuild — or add — a water diverter, or cricket, at the top.

For chimney chases built into gable walls, we install a partial diverter.

A partial diverter extending the sloped surface several inches beyond the corner

We always install diverter flashings wherever a roof intersects a wall.

Called "kickouts," these keep water from running behind the cladding below and into the wall assembly.

As we install the flashings, we take care to integrate them with the housewrap so that there is a continuous drainage plane under the siding.

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