Del Mar Terrace Water Damageon stepped lots and multi-level hillside homes

The name says a lot. Del Mar Terrace is built on a hillside where lots are cut into steps, and homes are designed to fit them: a garage and entry at the street, living space on one or two levels below or above, and decks and terraces stepping down toward the view. Many houses have walls of glass facing west, with large sliding or folding doors opening onto decks.

That layout means water has a long way to travel inside the house. A supply line that fails on the top floor does not just wet one room. Water runs through the floor, along joists and down wall cavities, and may show up two floors below as a dripping light fixture or a stain on a ceiling. Every level in between may be wet inside the walls even if the surfaces look dry.

Outside, the stepped yard and the slope above the house shape where rain goes. Terraced planting beds, retaining walls, patios and stairs all collect and redirect water. When drains in those features clog, or when grading tips toward the house, heavy rain ends up against walls and under doors.

And the views come with exposure. The west-facing glass that makes these homes special also takes the brunt of winter storms blowing off the ocean, and wind-driven rain can find its way past seals and thresholds that never leak in calm weather.

Winter storms on the San Diego coast often come with strong onshore winds, and some arrive as atmospheric rivers carrying heavy rain. ^[2] When wind drives rain sideways against a wall of glass, water is pushed into every gap: the bottom track of a sliding door, the corners of a window frame, the joints between panels of a folding door, and the flashing around them. A door that has never leaked before can leak badly in one storm, and then stay dry for the rest of the winter.

The water usually shows up at the floor just inside the opening, but that is not where the damage ends. It runs under the bottom plate into the wall on either side, soaks the subfloor or the edge of the slab, and can drip through to the level below. On upper floors, it may appear first as a ceiling stain in the room beneath.

Restoration starts with drying the wall cavities beside the opening and the floor just inside it, and checking the room below. Then a window or door specialist should check the seals, the sill pan and the weep holes in the track, which often clog with sand and debris near the coast.

Terraced gardens make the most of a steep lot, but they create many places for water to collect. Raised planters built against the house can soak the wall behind them, especially if irrigation runs often. Retaining walls at each step need open weep holes or a drain behind them, or the soil behind them fills with water. Patios and landings that slope toward the house send water to the door.

After a storm, walk the property: look for standing water against walls, drains that did not empty, weep holes that are blocked, and mud or debris washed against the house. Clearing these is the first step; a drainage contractor can add or repair drains, regrade patios and move planters away from walls.

Inside, dampness along a wall next to a planter, or in a lower room behind a retaining wall, often points to the yard rather than the plumbing. The room can be dried, but the dampness will come back until the drainage is fixed.

On the downhill side, many Terrace homes have a lowest floor raised on posts or a short foundation wall, with a crawlspace on the slope below. Water from leaks above, from wind-driven rain or from runoff can collect there. Because crawlspaces are rarely visited, a problem can go unnoticed until a musty smell rises into the house or floors start to soften.

Drying a crawlspace usually means removing wet insulation and a wet or torn vapor barrier, pumping any standing water, and running a dehumidifier under the house until the framing reaches its dry goal. A new vapor barrier goes down once the soil surface is dry. The rooms above may need drying at the same time.

Drying a house with several levels means treating each level as its own drying zone, with equipment and readings on each. Water that collected in a floor or ceiling assembly between levels needs air from both sides, which may mean opening a ceiling below. Stairwells move air between floors, so containment or closed doors can help each zone dry faster.

Humidity matters on the coast. Morning marine layer can keep outdoor air damp for days in late spring and early summer, so drying is usually done with the house closed and dehumidifiers controlling the air. On dry days with offshore winds, outdoor air may be useful; the readings decide.

Once the house is dry, the repair list often includes trades besides drywall and paint: a window and door specialist for leaking sliders, a deck or waterproofing contractor for a failed membrane, a drainage contractor for the yard. Fixing the cause before closing walls prevents a repeat in the next storm.

Work on slopes, retaining walls and grading can need permits and engineering. Ask the relevant city building department before you start structural or grading work. When replacing finishes, water-tolerant materials near large openings and on lower levels make future leaks easier to recover from.

Sudden internal leaks are usually homeowners claims. Wind-driven rain is a common grey area: some policies cover rain damage only if wind first created an opening, such as a broken window, while others treat seal failures as maintenance. Long-term deck leaks may be excluded as gradual damage. Surface runoff from a storm is often treated as flood.

Photos of the storm conditions, the water entry point and each affected level, plus the contractor's readings and drying log, make these claims clearer. The California Department of Insurance has consumer guidance if a claim stalls. ^[5]

Multi-level homes in the Terrace often have open stairwells, double-height living rooms and landings that join one level to the next. Those features move water as well as air. A leak on an upper landing can run down the stair stringers and soak every tread; water that reaches an open floor plan spreads across a wide area because nothing stops it.

Carpeted stairs need the carpet and pad lifted so the treads and stringers can dry. Hardwood stairs are dried in place where possible. In double-height rooms, high walls may be wet at the top from a leak above and dry at the bottom, which is the reverse of most leaks, so readings need to be taken at several heights.

Homes designed for light and views often add skylights, clerestory windows and rooftop decks. Each one is an opening in the roof with flashing that has to stay sound in salty, windy weather. A skylight leak usually shows as a drip or stain at the skylight well, but water may also run along the roof framing and come down in a wall. Roof decks over living space behave like any other deck: a membrane failure leaks into the room below. Check these openings every fall and after big storms, and have damaged flashing repaired before the next rain.

Some Terrace homes have pools, spas or fountains built into the terraces. Their plumbing, overflow lines and backwash discharge all add water to a hillside lot. A leaking pool line or a spa overflow that drains toward the house can soak a retaining wall or a lower-level wall for weeks, and because it is not storm-related, it is often blamed on something else.

If a lower-level wall is damp in dry weather, check the pool and spa equipment and lines, and make sure backwash and overflow water discharge where they are supposed to. A pool leak detection service can test the system. The room itself is dried in the usual way once the source is fixed.