Tracing a ceiling leak from the attic in an older Seattle house

In an older Seattle house, a ceiling stain during a storm is a question: where is the water actually getting in? The answer is almost never directly above the stain. Water that gets past old shingles, flashing or a chimney runs along wood until it finds a place to drop. If you trace it from the attic while it is still raining, you can show the roofer the exact spot, which often means a smaller repair and less ceiling to dry.

This guide is for attics you can reach through a hatch or a pull-down ladder. Many Craftsmans and bungalows in neighborhoods like Wallingford, Ravenna, Beacon Hill and West Seattle have low, cramped attics with steep rafters and kneewalls. If yours has no access, or the only access is through finished space you would have to cut into, skip ahead to when to call a professional.

Safety first in an older attic

An attic in a house built before the 1950s has hazards that a newer one does not. Read this before you climb.

• Step only on joists. The ceiling between joists is plaster on lath or thin drywall. It will not hold your weight, and a foot through the ceiling turns a leak into a much bigger repair. Lay a sturdy board or plywood scrap across several joists and kneel on it.
• Knob-and-tube wiring. Many older Seattle houses still have some of it in the attic: single wires on white ceramic knobs and through ceramic tubes. Do not touch it, do not move insulation around it, and if water is running near any wiring or a ceiling light fixture, turn off that circuit at the panel before you go up, as long as the panel area is dry.
• Vermiculite insulation. Loose, pebble-like insulation that is grey-brown or silver-gold may be vermiculite, and the EPA advises treating it as if it may contain asbestos. Do not disturb it, dig through it or vacuum it. If you see it, stay out and let a pro handle the tracing.
• Heat, nails and headroom. Roofing nails poke through the sheathing. Wear a hard hat or a thick cap, gloves, long sleeves and a dust mask, and use a headlamp so you keep both hands for holding on.
• Tell someone you are up there.

Step by step: tracing the leak

Do this while it is raining, or soon after. Once the rain stops and the wood dries, the trail fades.

1. Mark the stain from below. Measure from two walls to the center of the stain, or note which fixture or window it lines up with. Put a bucket and a towel under any drip.
2. Turn off power to any light fixture in or near the stain if water is coming through it.
3. Go up with a headlamp, a tape measure, a marker or chalk, and your phone. Get onto the joists over the room with the stain using your measurements.
4. Look up, not down. Shine the light along the underside of the roof sheathing and the rafters above the stain. Wet wood looks darker and shines in the light. Run a gloved hand along the rafters.
5. Follow the trail uphill. Water runs downhill, so the source is higher on the roof than the wet spot. Look for darker streaks, drips hanging from nail tips, or rust-colored lines on rafters and sheathing.
6. Check the usual suspects. In older Seattle houses, leaks most often start at the chimney, at plumbing vent pipes and exhaust fans that pass through the roof, at valleys where two roof slopes meet, at dormers and their side walls, and around skylights added after the house was built.
7. Mark the entry point. Circle it with chalk or marker and take photos with something for scale. Measure from it to a landmark you can also see from outside, such as the chimney, a vent pipe or the ridge. That measurement is what the roofer needs.
8. Catch the water. Put a plastic bin or a tarp-lined tray on the joists under the drip, never directly on the ceiling between joists. Move wet insulation off the ceiling only if it is fiberglass or cellulose and you can do it without stepping off the joists.
9. Photograph everything in the attic and in the room below before anything is moved. Those photos support a claim if there is one.

Below the ceiling: what to do while you wait

If the ceiling is sagging or bulging with water, it can come down. Keep people and pets out from under it. Our page on roof leak and storm water damage explains how to drain a small bulge into a bucket safely. Older plaster ceilings are heavy: if plaster is cracking, pulling away from the lath or sagging in a wide area, do not poke it and do not stand under it.

Move furniture, rugs and electronics out of the drip zone. Run a fan in the room to move air, but do not aim it at a wet ceiling you think might fall.

Typical costs around Seattle

These are typical Puget Sound ranges for planning, not quotes. Prices vary with the roof, its pitch and height, the weather and the contractor.

• Your own tracing: a headlamp, gloves, mask and chalk, often $30 to $70 if you have none of it.
• Emergency tarp by a roofer or restoration crew during a storm: commonly $300 to $1,200, more for steep or tall roofs.
• A small flashing or vent boot repair: commonly $300 to $1,000.
• Chimney flashing or a crown repair on an older brick chimney: often $600 to $2,500, more if the brick needs rebuilding.
• Drying a wet ceiling and attic and replacing wet insulation: depends on how far the water spread. A small stain and a soaked room are very different jobs.

For covered claims, restoration can be $0 upfront on covered claims - insurer billed directly - deductible applies. Our guide on whether insurance covers rain damage explains what policies usually treat as sudden and what they treat as wear.

When to call a professional

Stop tracing and call when:

• You see vermiculite or are unsure what the insulation is.
• Water is running near wiring, a junction box or a light fixture, or the breaker trips.
• The ceiling is sagging, the plaster is cracking or pieces are falling.
• You cannot find the source after a careful look, or water seems to come from more than one place. Hidden leaks inside walls and around chimneys are what leak detection is for.
• Insulation is soaked over a large area, or the wood stays wet for more than a day or two after the rain stops. Wet wood and insulation in a closed attic are where mold starts; see mold prevention after water damage.
• The attic is too low or cramped to move safely on the joists.

The 24-hour line is (844) 543-5757. A crew can tarp the roof, check the attic and ceiling with moisture meters and start drying the same day; emergency water extraction covers what happens when water has reached the floors. Coverage across the city is described on the Seattle areas page.

After the storm

Keep your photos and measurements with the roofer's invoice. If the same ceiling stains again next season, you will know whether it is the old entry point or a new one. And before the next atmospheric river, look at the roof from the ground: missing shingles, thick moss, a leaning chimney cap or gutters overflowing at one corner are all easier to fix in a dry week than in a downpour.