The short answer
Maintain fascias and soffits by washing them with mild soapy water once or twice a year, checking for soft timber, cracks, peeling paint or gaps, keeping the gutters above them clear, and repainting timber boards before the coat fails. Check vents are not blocked. Soft wood or boards that have pulled away need a roofer, not paint.
What the boards do and why they fail
The fascia is the board running along the rafter feet, directly behind the gutter. The soffit is the flat board underneath, spanning from the brickwork or stone to the overhang. Between them they keep weather and wildlife out of the eaves and, on many houses, carry the ventilation openings that let the roof void breathe.
They fail for one main reason: water. A leaking joint, an overflowing gutter or a failed roof edge keeps the board wet, and wet timber rots from the back and the bottom. Painted timber will often look sound on the surface while the board behind is soft. Plastic boards cannot rot, though they can warp, crack with age and discolour. One cost guide suggests inspecting these boards about every five years, and puts replacement of uPVC fascias and soffits somewhere between every 10 and 20 years depending on the material. That is a rough guide, not a deadline.
The best protection is dry boards. Everything that keeps rainwater inside the gutter and away from the roof edge is maintenance for the fascia.
A simple annual routine
Choose a dry day in spring or autumn and work round the house from the ground first, then from a ladder where it is safe.
- Look. Scan the full length of each board for sags, gaps at joints, cracks, and stains below a gutter joint.
- Wash. Soapy water and a soft brush lift dirt, algae and cobwebs. Rinse with a hose on a gentle setting. Hard jets can force water into joints and behind the boards.
- Probe timber. Press a screwdriver tip into the underside edge and the bottom corners of wooden boards. If it sinks in, the wood is soft.
- Check the paint. Blistered, flaking or cracked paint lets moisture in. Sand back to sound timber and recoat before winter.
- Check the joints. Where boards meet, look for gaps that let in water or birds.
- Check the gutter. Clear it, and make sure nothing is leaking onto the board. See our answer on fixing a leaking gutter joint.
Keep a few photographs each year so that you can see changes over time.
Painting and protecting timber
Timber fascias and soffits last when the coating is kept intact. Paint is a skin, and once it breaks, the grain draws up water.
Preparation takes most of the time. Remove loose paint, sand the edges, and treat any bare patches with a suitable primer before topcoating. The bottom edge and the back of a board are the most exposed and most often missed, so give them particular attention while the board is accessible. Use an exterior paint made for timber and apply two coats.
Before swapping the material or profile of a board on a protected building, ask the planners first. Replacing timber with plastic can alter the character of the roofline, so ask B&NES before you commit. Our page on uPVC gutters in a conservation area covers a similar question for guttering.
Paint will not cure rot. If a board is soft, the sound wood has to be cut back and spliced, or the board replaced.
Ventilation, pests and the soffit
Many soffits hold small vents, or have a continuous gap behind them, that let air into the roof void. That moving air carries moisture out and keeps the timbers dry. Paint, cobwebs and loft insulation packed hard into the eaves can all block it.
When you wash a soffit, check that any vent is clear. A blocked vent can lead to condensation in the loft, which shows up as damp timbers or mould on the underside of the roof covering.
Look closely, too, at the corners and ends. Gaps at a soffit joint or beside a bargeboard, the sloping board at a gable end, are a way in for wasps, squirrels and birds. If you find a nest that is in use, leave it; nesting birds are protected, and the work can wait. Bats are also protected, so a roofer who finds one will stop and take advice.
Asbestos was used in some older soffit boards. If a board looks like a flat grey sheet and the house is older, do not drill, sand or break it. Read our page on asbestos soffits first.
When to call a roofer
Maintenance can slow wear, but it cannot reverse it. Call for advice when you find soft timber, a board that has pulled away from the rafter ends, sagging along a run, or a stain that returns after cleaning. A fascia that carries the gutter must be solid enough to hold the fixings, and a rotten one lets the gutter sag.
The decision between patching and replacing a length of board is often a matter of how far the rot has gone and how easily the rest can be matched. Our guide to how long gutters last is useful here, as a gutter and its fascia often reach the end of life around the same time, and it makes sense to renew both while the access equipment is up.
Our roofline survey is free, we photograph the boards, and what we then send you is a written quote at a fixed figure. Our gutters, soffits and fascias service page lists what we handle, and you can read about what blocked gutters do to a roofline if water is your worry.
