Step Flashing

L-shaped pieces of metal installed where a roof meets a vertical wall, such as a chimney or dormer. Each piece overlaps the one below to channel water down the roof.

Why Step Flashing Matters for Insurance Claims

Step flashing is one of the most important waterproofing details on a residential roof. Every wall-to-roof intersection requires it, including chimneys, dormers, sidewalls, and additions. When storm damage displaces or bends step flashing, water can enter the wall cavity and cause interior damage that far exceeds the cost of the flashing itself. Adjusters should inspect every roof-to-wall junction during a storm damage assessment and document any lifted, bent, or missing step flashing pieces.

Step Flashing in Xactimate Estimates

Step flashing has its own selector code in Xactimate under the RFG trade category. It is measured in linear feet and should be listed for every roof-to-wall intersection on the structure. If counter flashing is also present (as on masonry chimneys), both step flashing and counter flashing should appear as separate line items. The estimate should also include removal of existing step flashing as a distinct line item when the roof is being torn off.

Proper Installation

Each piece of step flashing is woven between courses of shingles, with one leg extending up the wall and the other lying flat on the roof surface. The pieces overlap in a stair-step pattern so water is always directed downhill. Continuous L-flashing used in place of individual step pieces is a code violation and installation defect that frequently leads to leaks. When documenting existing conditions, note whether individual step pieces or continuous flashing was used, as this affects the repair scope.