Signs Your Fascias and Soffits Need Replacing

What fascias and soffits actually do

The fascia is the long board fixed to the ends of the rafters, just below the roof tiles. It carries the weight of the gutter and the water that runs into it, so a weak fascia soon leads to a sagging or overflowing gutter. The soffit is the board tucked underneath, bridging the gap between the fascia and the wall. It seals the roof edge and usually contains the ventilation that lets air move through the loft.

On older houses in Hythe, Dibden Purlieu and across the New Forest villages, these boards are often original softwood timber, painted many times over. Homes built or refurbished from the 1990s onwards more commonly have uPVC. Both can fail, just in different ways, and the salt air off Southampton Water and the Solent does neither any favours.

Warning signs you can spot from the ground

You do not need to climb a ladder to pick up most of the early signs. Stand back from the house on a bright day and look along each roof edge, then check again after heavy rain.

Look out for the following:

• Paint flaking, bubbling or peeling in patches, which usually means moisture has got behind it and into the timber.
• Dark staining or green algae streaks on the fascia below gutter joints, a sign the gutter has been leaking onto the board for some time.
• A visible dip or wave along the gutter line, which often means the fascia behind it has softened and the brackets are pulling loose.
• Cracks, warping or a chalky, yellowed surface on uPVC boards, particularly on south and west facing elevations that take the most sun.
• Gaps opening up where the soffit meets the wall or at corner joints.
• Birds, wasps or squirrels going in and out under the eaves, which means there is already a hole big enough to worry about.
• Damp patches or a musty smell at the top of upstairs walls or in the loft, close to the eaves.

Signs that are more serious than they look

Some problems are cosmetic and some are structural, and it is not always obvious which is which. Soft timber is the one to take seriously. If you can press a screwdriver into a fascia and it gives, the rot has usually travelled further than the surface shows, often along the whole length of a board. Rot also tends to spread into the rafter feet behind, which is a far more expensive repair once it takes hold.

A gutter that has been overflowing for a couple of winters can also saturate the wall plate and the top course of brickwork. In cavity walls that moisture can bridge into the inside face of the wall, which is why damp at ceiling level upstairs is often traced back to the roof edge rather than the roof itself.

Blocked or missing soffit ventilation is easy to overlook. Without airflow, warm damp air from the house condenses on the underside of the roof felt and drips onto the insulation. If you see mould on the rafters or wet insulation near the eaves, check whether the soffit vents have been painted over or were never fitted.

Repair or full replacement?

If the damage is limited to one short run, a single rotten section of timber can sometimes be cut out and spliced in. Small cracks in uPVC can occasionally be covered with a capping board. This is a reasonable short term fix when the rest of the roofline is sound, but it rarely makes sense if the boards are more than 25 to 30 years old, because the next section will fail soon after.

Full replacement usually means stripping the old boards, checking the rafter ends, and fitting new uPVC fascias, vented soffits and guttering in one go. For a typical three bedroom semi in this part of Hampshire, that is commonly a one to two day job. Costs vary a good deal with the length of roofline, whether scaffold is needed, the state of the rafters underneath and the type of guttering chosen, but many homeowners find themselves in the region of £1,500 to £4,000. A bungalow with a long, low roofline can cost more than a two storey house of the same footprint simply because there is more board to fit.

Whatever you decide, ask for the rafter ends to be inspected and for any soft timber to be treated or replaced before new boards go on. Capping new plastic over rotten wood hides the problem for a few years and then costs more to put right.