Skylight Leak Prevention Before the Rain: What to Check Right Now
Here's the thing most homeowners don't realize about skylight leak prevention in rain season: the glass almost never leaks. What fails is the flashing — the metal collar that seals the gap between your skylight curb and the surrounding roofing material. By the time you see a water stain on your ceiling, that flashing has usually been failing quietly for months.
Los Angeles gets a false sense of security from our dry summers. Then October hits, the first real storm rolls in, and suddenly there's a drip right under the skylight you forgot existed. Let's fix that before it happens.
The Real Culprit: Step Flashing and Sealant Breakdown
Step flashing is woven between the shingles and the raised wood curb that frames your skylight. Over time — especially after years of UV exposure and thermal cycling (hot days, cool nights, repeat) — that flashing lifts, corrodes, or separates at the seams. The sealant that backs it up dries out and cracks.
When rain hits at an angle, which it does in LA storms, water finds those gaps immediately. It doesn't drip straight down — it travels along the wood curb and shows up feet away from the skylight itself. That's why homeowners often blame the wrong spot.
What You Can Check From Inside Right Now
Before the rains arrive, do a quick interior check:
- Look at the curb framing around the skylight from inside. Any dark staining, soft drywall, or paint bubbling near the frame is a sign water has already been getting in.
- Check the lens or glass seal. Run your finger along the interior edge where the glazing meets the frame. If it feels brittle or you can see daylight gaps, the seal is compromised.
- Look up at the ceiling around it — not just directly below. Water travels. A stain 18 inches away from the skylight is still a skylight problem.
What a Roofer Checks That You Can't
From the roof, the inspection is different. We're looking at whether the step flashing is properly lapped and nailed, whether the counter-flashing is seated against the curb, and whether the sealant bead has pulled away from the frame. We also check the surrounding shingles — if they've lifted or cracked near the skylight opening, water is getting under them before it even reaches the flashing.
This is a 20-minute inspection that can save you a $3,000–$8,000 interior repair bill. We see it every fall.
If your skylight is more than 10–15 years old and hasn't been inspected, now is the right time — not after the first storm proves there's a problem.
Book your free roof inspection online: https://calendly.com/samuelroofinginc Or call us directly at (866) 685-3889. We serve Sherman Oaks, Encino, Calabasas, Beverly Hills, Brentwood, and surrounding LA neighborhoods. Every inspection comes with a transparent, no-surprise quote — and our work is backed by a 10-year workmanship warranty.
Learn more about quality standards from California CSLB licensing guidance.