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Skylight Leaks on the Oregon Coast: Seal, Reflash, or Replace?
A skylight leak can be frustrating because the answer is rarely as simple as putting a little sealant around the glass.
Sometimes the skylight itself is failing. Other times the skylight is perfectly fine and the
real problem is the flashing around it. We also see condensation mistaken for a roof leak,
especially during the cooler and wetter months along the Oregon Coast.
That is why the first step should always be figuring out where the water is actually
coming from.
We are Hardesty Roof Replacement, serving homeowners from Lincoln City to Arch Cape. After more than 20 years working in coastal weather, we have seen plenty of skylight leaks that looked obvious at first and turned out to have a completely different cause once we opened things up.
Here is how we decide whether a skylight needs a simple repair, new flashing, or
complete replacement.
Why Skylights Are Common Leak Areas
Any time you cut an opening into a roof, that opening needs to be carefully integrated
into the roofing system.
A skylight depends on several parts working together. The skylight frame needs to
remain watertight. The flashing needs to direct rain around the opening. The roofing
material needs to overlap the flashing correctly. The underlayment underneath also
needs to protect the roof if wind driven rain gets beneath the shingles.
On the Oregon Coast, those details have to deal with heavy rain, strong wind, debris,
moss, and long periods of moisture.
One weak spot can be enough to create a leak.
Our roof flashing problems guide explains why flashing around skylights and other roof
penetrations is so important in coastal weather.
Not Every Skylight Leak Is Actually a Roof Leak
This catches homeowners by surprise.
If you see water around a skylight, the first assumption is usually that rain is coming
through the roof.
Sometimes it is.
Other times, condensation is forming on the inside of the skylight and running down the
frame.
VELUX, one of the largest skylight manufacturers, even includes condensation as one of
the conditions that can make a skylight appear to be leaking when it is not raining.
Condensation becomes more likely when indoor humidity is high and the skylight
surface is cold.
If the water shows up even when there has been no rain, condensation deserves a closer
look.
If the leak only appears during heavy rain or strong wind, we start looking harder at
flashing, roofing, and the skylight itself.
When the Flashing Is the Problem
Flashing is one of the first places we inspect.
A properly flashed skylight should direct water around the opening and back onto the
roof surface.
Problems can develop when flashing is bent, damaged, installed incorrectly, or
disturbed during previous roof repairs.
Debris can also collect along the upper side of the skylight. Needles, leaves, and moss
hold moisture and interfere with drainage.
VELUX recommends keeping leaves and other debris away from skylight flashing so
rainwater can move freely around the unit.
A flashing problem does not always mean the skylight needs to be replaced.
If the unit is still in good condition and the leak is coming from the surrounding roof
details, reflashing may be the better option.
When Sealant Is Enough
Homeowners ask us about caulk all the time.
There are situations where sealant is part of the repair. A small exterior joint or
manufacturer specified connection may need to be resealed.
The mistake is treating sealant as the entire waterproofing system.
If the flashing underneath is wrong, putting another layer of caulk over the problem
usually buys time rather than solving the problem.
The same applies to roofing cement. Covering the perimeter of a skylight with roofing
cement can hide the actual failure and make the eventual repair more difficult.
We want water to be redirected properly, not simply blocked by a pile of sealant.
When Reflashing Makes More Sense
Reflashing can be a good option when the skylight itself is still performing well.
We usually look at the age of the unit, condition of the glass, condition of the frame, and
whether there is any moisture trapped between glass panes.
Then we inspect the surrounding roof.
A proper flashing repair may require removing shingles around the skylight, checking the
underlayment and roof decking, replacing the flashing system, and reinstalling the
roofing so every layer overlaps correctly.
This is much different from spreading sealant around the edge.
If your skylight only leaks when wind is pushing the rain hard against the roof, our wind
driven rain roof leak guide explains why those conditions expose weak roof details so
quickly.
When Replacing the Skylight Is Smarter
There comes a point where repairing the flashing around an old skylight does not make
much sense.
If the unit itself has failed seals, damaged glass, a deteriorated frame, or repeated leak
problems, replacement may give you a better long term result.
We also talk about replacement when a homeowner is already getting a new roof.
That is a good time to look closely at older skylights because the surrounding roofing is
already being removed. Replacing an aging unit during the roofing project can avoid
disturbing a new roof a few years later.
Our residential roofing services page explains how we approach complete roofing systems for coastal homes.
Signs a Skylight Needs Attention
You do not have to wait for water to start dripping onto the floor.
Watch for:
Staining around the skylight opening
Bubbling or peeling paint
Damp drywall
Water appearing during wind driven rain
Moisture between the glass panes
Cracks in the glass
Moss or debris collecting above the skylight
Visible gaps around flashing
A musty smell near the opening
Repeated repairs to the same skylight
If the leak is active, the priority is protecting the interior before more damage occurs.
Visit our Emergency Roofing Services if water is currently entering the home.
What We Inspect Before Recommending a Repair
We do not automatically blame the skylight.
We look at the entire area around it.
That includes the roofing material above and beside the unit, flashing, underlayment,
roof decking, nearby valleys, debris buildup, seals, and the skylight frame itself.
Inside, we look for staining and water trails because the location of the ceiling stain does
not always tell us exactly where the leak began.
If the leak appeared after a major coastal storm, our Storm Damage Roof Inspection
Guide explains what else homeowners should check around the roof.
How to Help Prevent Skylight Leaks
A little maintenance goes a long way.
Keep leaves, needles, and moss from collecting around the upper side of the skylight.
Make sure water can move freely around the flashing. Look for damaged roofing nearby
after strong wind.
You should also pay attention to interior condensation. If a skylight is constantly wet
inside when it has not been raining, the issue may involve humidity and ventilation rather
than the roof.
Most importantly, do not ignore the first stain.
Finding a small flashing problem early is much easier than dealing with wet insulation,
damaged decking, drywall repairs, and mold later.
Skylight Leak FAQs
Why does my skylight only leak during heavy wind and rain?
Wind driven rain can push water into flashing joints and roof details that stay dry during
normal rainfall. The flashing and surrounding roofing should be inspected.
Does a leaking skylight always need replacement?
No. If the skylight is still in good condition and the problem is limited to the flashing,
reflashing may solve it.
Can I just caulk around the skylight?
Sealant may be appropriate for certain joints, but it should not replace properly installed
flashing.
Why is there water on my skylight when it is not raining?
It may be condensation. Indoor moisture can collect on cold skylight surfaces and run
down the glass or frame.
Should I replace skylights when replacing my roof?
It is worth considering if the skylights are older. Since the surrounding roofing is already
being removed, replacement can be easier than disturbing a newer roof later.
Need Help With a Leaking Skylight on the Oregon
Coast?
A skylight leak is much easier to repair before water damages the decking, insulation,
and interior of the home.
Hardesty Roof Replacement serves homeowners throughout the Oregon Coast,
including Tillamook, Pacific City, Neskowin, Netarts, Oceanside, Lincoln City, and
surrounding communities.
We can inspect the skylight, flashing, roofing, and attic area and show you whether the
right solution is sealing, reflashing, roof repair, or skylight replacement.
If water is actively entering the home, visit our Emergency Roofing Services.
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