What Z-flashing means
Z-flashing is a metal strip bent in a Z shape that sits at horizontal joints in siding or trim, such as over a window head trim or between sheets of panel siding, to send water out.
Also called Z-bar flashing.
Where it matters on a siding job
Missing Z-flashing over trim is a common source of rot on panel and fiber cement siding. It is cheap to add while the wall is open, so make it a standard line on residing jobs.
What it costs
Jobs that involve Z-flashing are priced in the siding repair cost guide: about $1,400 typical, usually $820 to $1,950. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Siding repair cost
- Tools, templates and guides: Free siding resources