Look up at the edge of any pitched roof and you will see a run of boards under and along the overhang. Most people call all of it the fascias, or the soffits, or simply the woodwork. They are three different parts with three different jobs, and when one fails the damage rarely stays where it started. Water finds the rafter ends, the gutter pulls away, a gap opens for birds or wasps, and the loft loses the air that keeps it dry. This guide explains what a fascia, a soffit and a bargeboard are, where each sits, what each is there to do, and how they go wrong. It stays on the parts themselves. Materials, replacement and design each have their own page, linked below, so you can go as deep as you need to on a single question.
The roof edge, part by part
The edge of a pitched roof is where the structure, the covering and the rainwater system all meet, which is why it has so many named parts. Start from the wall and work outwards and upwards.
Rafters, the inclined timbers that support everything above, usually run past the wall at the bottom to form the overhang. The projecting ends are called the rafter feet. Along the front of those feet, standing upright, is the fascia: a long board that closes off the rafter ends and gives the roof a finished edge. The gutter is normally fixed to it.
Underneath the overhang, running flat from the top of the wall out to the back of the fascia, is the soffit. It closes the gap between wall and fascia so the underside of the roof is not open to the weather. Many soffits are plain boards. Others have vents cut or moulded into them so air can pass into the roof space.
At a gable end, where the roof ends against the gable wall with no gutter, the raking edge is known as the verge. The board that runs up the verge, the equivalent of a fascia on the slope, is the bargeboard. On older houses it may be plain, cut with a decorative edge, or carried on shaped brackets.
Around all of this sits the eaves, a word used for the lower edge of the roof and the overhang together. When a roofer says the eaves are in poor condition, they usually mean the fascia, the soffit and the first courses of covering above them.
Why the names get mixed up
The three boards are painted or finished to match, they sit close together and from the ground they read as one band of trim. That is also why a quote for "fascias" sometimes means all three. Ask for the parts to be listed by name, so you know whether the soffit and the bargeboards are included.
What the fascia does
The fascia has three jobs, and only one of them is visible from the street.
First, it holds the gutter. Brackets are screwed through the gutter and into the fascia, so a full gutter, weighed down with rain, leaf litter or, in a cold spell, ice, hangs from that board alone. If the fascia is soft or split, the screws lose their grip and the gutter begins to sag away from the wall. A sagging gutter does not drain properly, and the water it spills streams down the masonry underneath.
Second, it closes the rafter ends. Rafter feet are end-grain timber, and end grain soaks up water far more readily than the sides of a board. The fascia keeps rain and wind-driven spray off them. Take the fascia away, or let it rot, and the feet are exposed to the same water that was meant to stay in the gutter.
Third, it sets the line for the bottom of the roof covering. The lowest row of tiles or slates sits on or just behind the fascia. Under that row lies the underlay, the waterproof membrane spread across the rafters and held down by battens (the slim timber laths that hold the covering), and it is normally dressed down over the board so that any water getting through drops into the gutter. A fascia that has dropped or twisted shifts the line of that bottom row and leaves the underlay working badly.
Good fascia work is therefore not cosmetic. When we look at one on a survey we check the board itself, the fixings, the rafter feet behind it, and the way the underlay and the eaves course sit above it. The board is the visible part of a small system.
What the soffit does
If the fascia is the face of the roof edge, the soffit is its underside, and it does quieter work.
The most obvious job is closure. Without a soffit the gap between wall and fascia would be open to the rain and wind, and the space above it would be an invitation to birds, squirrels and wasps. Nesting birds and bats are both protected by law, so if you find either using the eaves, stop work and ask for advice before anything is sealed up.
The second job is ventilation. A cold loft, where the insulation lies on the ceiling and the space above is unheated, needs air passing through it to carry off the moisture that rises from the house. Warm, damp air from kitchens, bathrooms and bedrooms drifts upwards, and trapped there it turns to droplets on chilly rafters and underlay. Often the soffit is the intake for the fresh air that carries it away. Marley, citing BS 5250 for a cold roof with a non-breathable underlay, gives 25 mm of continuous opening along the eaves at a pitch of 15 degrees or less, and 10 mm above that. A breathable underlay changes the figures. Read them as a manufacturer's typical numbers, not a specification for your house, because the right provision depends on the roof.
The point for an owner is simple: a vented soffit should stay open. Paint that clogs the slots, insulation pushed hard against the eaves, and solid replacement boards fitted where vented ones used to be can all cut off the air. We explain the vent options on our page about soffit vents.
The third job is appearance. A flat, painted soffit gives the eaves a clean line and hides the rafter feet, the gap and the cables or pipes that sometimes pass through it.
Bargeboards and the gable end
A bargeboard is a fascia that has been turned through ninety degrees to follow the slope of a gable. It covers the end of the roof timbers at the verge and gives the edge of the roof its shape. Where a gable has an overhang, the underside of that overhang is closed by a board too, and the gap above the wall is sealed with the covering and its pointing or a dry-fix verge trim.
Bargeboards fail differently from fascias, and for a slightly different reason. A fascia is shielded to some extent by the gutter. A bargeboard has nothing above it but the edge of the roof covering, and it takes the full force of driving rain, wind and sun on a high, open edge. The top of the board, where the covering overlaps it, is the weak point: water sits there, the paint breaks down and the timber rots from the top downwards. On older houses the boards are often long, thick and shaped, which makes them expensive to replace like for like and worth repairing where the timber is sound.
They also look after something less obvious. At the verge, the covering is held down by the edge detail. Under BS 5534:2014 the verge is expected to be mechanically fixed and not left to mortar alone, so a rotten bargeboard and a loose verge often turn up together. If you can see daylight between the board and the roof, or the last row of tiles is lifting, say so when you call.
Bargeboards on some period homes carry a decorative profile that is part of the character of the house. Our page on bargeboards covers the repair-or-replace decision in more detail. Anyone weighing a change of style for the gable should read the roofline upgrades guide.
How the boards fail and what you can see from the ground
Roofline boards seldom fail all at once. They give small warnings, and most of them are visible from the garden or the pavement.
Timber
Look for flaking or bubbling paint, which means moisture has got behind it. Dark staining below a joint suggests water is running off the gutter back onto the board. Soft or crumbling timber, especially where a screwdriver or a thumbnail sinks in, is rot. Hairline splits along the grain open as the timber swells and shrinks and let in more water. Rot usually starts at the joints, the bottom edge and wherever paint has been missed, such as the back of the board or the cut ends.
Plastic and metal
uPVC does not rot, but it can warp in heat, discolour, crack at the joints and lose the clip that holds a cover board in place. Aluminium and other metal trims can dent, and their fixings can work loose. In every material the problem to watch for is movement: a board that has begun to bow or hang off the rafters has lost its fixings.
Signs that the damage has gone further
A gutter that drips at the back, not the front. Water marks on the wall under the eaves. Daylight, or a bird, where the soffit should be solid. Damp or mould patches on the loft timbers near the eaves, or a musty smell in the roof space. Each suggests water or air is getting into a place it should not.
A caution on age. Boards fitted a long time ago on some houses were made from materials that are no longer used, including asbestos-containing board. If you suspect that is the case, leave it alone: no drilling, scraping or breaking up. Read our page on asbestos soffits before anyone touches it.
Soffits and fascias on Bath houses
Bath raises questions a national guide would skip. Many of its houses are listed, and on a Georgian terrace or a Victorian villa the roof edge is part of what passers-by see. Repairing a board in its original material is the easy case. Swapping timber for plastic, or altering a profile, is the one to ask about first: B&NES Council's conservation team can say whether listed status brings consent into it, and its listed buildings page gives their contact details.
Older roofs in Bath are often built with deep overhangs, timber brackets or cornices and stone parapets. Where there is a parapet, the gutter sits behind the wall and there may be no fascia in the usual sense at all. Our guide to cast iron gutters covers the fixings on those houses. Where the roof is a conventional pitch with a fascia, the board is generally a modest repair if it is caught early.
On our visit we check the boards, the rafter feet behind them, the vents and the bottom row of covering, and photograph them for you to keep. A written fixed price follows. Replacement is covered on our fascia board replacement page, the choice of board material on soffit materials, and and the full range of work sits under gutters, soffits and fascias.