Discoloured fascia boards can mean surface mildew that one soft wash lifts, or rot and failed paint that no wash can touch. Read the stain from the ground, learn what a soft wash does on fascia and see which repairs come first.
In This Article
What the colour is telling you
Fascia is the board along the roof edge that the eavestrough hangs from. It sits where rain never rinses it, so it collects growth, dust and runoff. The pattern of the stain narrows down the cause.
| What you see | Usual cause | Will a soft wash help? |
|---|---|---|
| Green film, worst on north and shaded sides | Algae | Yes |
| Black speckles that spread | Mould or mildew | Yes |
| Grey dust or soot that wipes off | Airborne grime | Yes |
| Dark vertical stripes under a gutter seam, end cap or roof edge | Dirty water spilling or dripping over the face | It cleans the stripes, but they return until the leak is fixed |
| Chalky, faded finish that rubs off on a finger | Oxidized paint or aluminum | It brightens a little. Recoating fixes it |
| Peeling, blistering paint | Paint failure, often from moisture behind it | No. Scrape, prime and repaint |
| Dark, soft or crumbling wood | Rot | No. It needs repair |
| Orange streaks near hangers or nails | Rusting fasteners | Only for a while. Replace the fasteners |
Checking the board safely
Start from the ground. Use binoculars or your phone's zoom, and photograph each stretch of roof edge. Note where the stripes line up with a gutter seam, a downspout outlet or a corner.
Many homes have wood fascia wrapped in aluminum or vinyl, which hides the wood behind it. A stained cap can sit over damp or soft wood, so look for sagging lines, gaps at the joints and wet marks on the soffit underneath.
Touching the board means a ladder. Ontario's Working at Heights training exists for workers, not as a homeowner requirement, but the same habits help: firm, level footing, three points of contact, no leaning sideways and someone nearby. If a ladder must reach over a porch roof or a steep slope, leave the check to a professional. Where you can safely reach, press a screwdriver tip gently into one suspect spot. Sound wood pushes back. Rot lets the tip sink in.
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What a soft wash does on fascia
A soft wash treats growth without force. The crew applies a cleaning mix at low pressure, lets it dwell for the label's time and rinses with plenty of water. The rinse runs down the face of the board and is not aimed up under the gutter or the drip edge, where it could be driven behind the trim.
On most house washes, fascia, soffits and trim are part of the scope, because they grow mildew first and look dark beside clean siding. Confirm they appear on the written quote. A crew will also point out flaking paint before spraying, since even a gentle rinse can lift paint that is already failing.
Problems to fix before, or instead of, washing
- Rot. Wet wood that keeps getting wet needs cutting out and replacing. Washing it only pushes more water in.
- Overflowing or leaking eavestroughs. Spilled water stripes the face and soaks the wood. See how clogged gutters damage fascia boards.
- Loose hangers and sagging troughs. A trough that tilts away from the board dumps water behind it.
- Open joints and gaps. Water gets in at every one, so caulk or repair them.
- Ice damming. Winter meltwater backed up under shingles can run behind the fascia and stain it from the inside.
- Nesting damage. Birds, squirrels and wasps in gaps leave stains and holes.
Stains that come back in the same spot are a sign that one of these is still active.
A sensible order of work
- Clear the eavestroughs and downspouts so water stops spilling over the fascia. Gutter cleaning comes first for a reason.
- Repair or replace rotten boards and refasten anything loose.
- Soft wash to kill the growth and lift the dirt film.
- Let everything dry completely.
- Caulk open joints, prime bare wood and repaint.
- Look again after the next heavy rain.
The order matters. Paint over mildew and it flakes early. Paint over damp wood and it blisters. Wash rotten wood and you spread the damage. Ongoing care is covered in fascia and soffit maintenance for Ontario homes.
Why fascia work suits a trained crew
Fascia runs along the roof edge, often two storeys up, which makes it a job for the right equipment and training. D&D's crew members are Working at Heights certified, and soft washing starts from $350 for typical Kitchener-Waterloo homes, while gutter cleaning starts from $125. Each quote is free, and the price is confirmed in writing before anyone starts.
If the fascia itself needs replacing, that is carpentry, and the eavestrough usually has to come off and go back on. Plan it as one job so you are not paying to take the system apart twice.
Key Takeaways
- Green film, black speckles and grey grime on fascia are surface growth and dirt, and a soft wash suits them.
- Peeling paint, soft or crumbling wood, oxidized finishes and rusty fasteners are not cleaning problems and need repair or recoating.
- Stripes that return in the same spot mean an overflowing or leaking eavestrough, so clear and fix the water source first.
- Work in order: clear the troughs, repair rot, soft wash, let it dry, then caulk and paint.
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