Cedar shake, synthetic slate and complex reroofs in Potomac (20854)

A house with twelve gables and four dormers has a long list of places where two slopes meet, and every one of those valleys carries water from both sides. On Potomac homes built in the 1980s and 1990s, the original valleys were often woven shingle or thin galvanized metal over a single layer of felt. Twenty-five years of leaves sitting in them and the metal wears through or the shingles crack along the center line.

We trace these leaks from the attic first, following stains on the rafters back up to the source, then open the valley from above. A proper repair strips the valley to the deck, lays a full-width ice barrier, installs a new open metal valley in copper or prefinished steel and reweaves the field material on each side. Patching just the wet spot rarely lasts.

Crickets behind wide chimneys and the walls where a lower roof dies into a second story are the next most common culprits. Kickout flashing at the bottom of those walls is often missing entirely on houses from this era.

Hand-split cedar shake gives the warm, textured look many owners in Bradley Farms and the older River Road subdivisions want. On sunny, open lots it lasts well. Under the heavy oak and tulip poplar cover near the C&O Canal and the Potomac, it stays damp, grows moss and splits sooner. We install new shake over a breathable mat so air can move under each course.

Synthetic slate is the choice we price most often here, because it keeps an upscale look, weighs a fraction of stone and goes on faster across a large roof. Natural slate is still right for some houses, especially when the framing was designed for it and the owner plans to stay for decades. We bring samples of each and stand them against the brick or stone in daylight.

Standing seam metal often finishes the smaller pieces: a bay window roof, a porte cochere, a curved entry. We fabricate those panels to fit and tie them into the main roof with proper flashing rather than sealant.

Some subdivisions, including Avenel and parts of the newer neighborhoods off Falls Road, have association rules for roof material and color. Before tear-off, we pull manufacturer data sheets and sample boards for you to submit, and we wait for written approval before ordering. A full replacement also goes through the county permit office, and we schedule its inspections.

Long drives and large lawns make staging easy, but they also mean long carries and expensive landscaping. Materials come up by conveyor or lift, the dumpster sits on plywood and every bed under the eaves gets covered. On a reroof this size, we stage one elevation at a time so most of the house stays dried-in every night.

Family rooms with cathedral ceilings and rows of skylights are common in Potomac. Those ceilings leave little attic space, so heat escapes straight into the roof deck and melts snow that refreezes at the eaves. Ice dams then back water up under the shingles along the gutter line.

During a reroof, we can add vent channels, a ridge vent and wider ice barrier at the eaves. Old curb-mounted skylights get new flashing kits or replacement units, and our skylight repair work includes resealing the interior well where condensation has stained the drywall.