The Guide to Roof Flashing

Step Flashing is a critical type of flashing used where a sloped roof meets a vertical wall, such as chimneys or the sides of dormers. It’s installed in “steps” along the roofline, with each piece woven between courses of shingles and bent up against the vertical surface. This method creates a layered, water-resistant barrier that effectively channels water down the roof and away from vulnerable intersections.

Counter or Wall Flashing is a protective layer installed over step flashing to complete the seal. Its main purpose is to cover and protect the top edge of the base flashing, preventing water from seeping behind it. For masonry like brick or stone, counter flashing is embedded directly into a ground-out mortar joint for a permanent, watertight seal. This two-part system is the professional standard for protecting chimneys and walls.

Valley Flashing is installed where two roof slopes meet, an area that handles a large volume of water. An 'open valley' uses a durable piece of metal (aluminum or copper) laid along the valley. We recommend a 'W' valley profile, which has a raised center ridge to prevent water from one roof plane from crossing onto the other. A 'closed valley' shingles over the metal, which can trap debris and wear faster. For performance, open valleys are superior.

Surface Mount Flashing is used to protect the transition between a vertical wall and a roofing surface, often on materials like stucco or siding. It is an additional layer of flashing where the top edge is sealed with a high-grade waterproof sealant to block water entry. While effective as a repair or in specific situations, it is generally less durable than counter-flashing that is integrated into the wall itself.

Ridge Capping serves as the protective covering along the peak (ridge) where two roof slopes meet. Its purpose is to seal this high-point against water intrusion and wind uplift. While many roofs use asphalt ridge cap shingles, upgrading to metal ridge capping in copper or aluminum provides far superior durability, longevity, and a distinctive, high-end look that enhances your home’s curb appeal.

Drip Edges are metal flashings installed at the eaves and rakes of a roof to direct water away from the fascia and into the gutters. Its small angled lip breaks water's surface tension, preventing it from curling back under the shingle and rotting the roof deck and fascia boards. It’s a small but essential component for preserving the integrity of your roof’s perimeter.

Coping or Parapet Capping is a protective metal cover installed on top of parapet walls, which are common on flat and low-slope roofs. The top of a parapet is extremely vulnerable to water infiltration, which can damage the entire wall structure. A properly fabricated and installed coping cap made from aluminum or copper is the only way to ensure this area remains waterproof and structurally sound.