Stand in front of a house and look at where the roof stops. Along that edge you will see a horizontal board, usually painted or plastic, and a channel fixed to it. Tilt your head back under the overhang and there is a flat panel running from that board to the wall. People often call the whole assembly "the guttering", but it is really four parts with four jobs: the fascia, the soffit, the gutter with its downpipes, and on a gable end the bargeboard.
This guide takes the parts one at a time, shows how they depend on each other, and answers the question we hear most often: what is the difference between a gutter and a fascia? For the shapes gutters come in, read half-round, square or ogee gutter profiles. For the work we do on all of them, see guttering, soffits and fascias in Stroud.
Where each part sits, from the roof down to the wall
Follow the rain. Water runs down the slope of the roof covering, reaches the bottom edge and drops off into the gutter. The gutter is held by brackets, and in most houses those brackets screw into the fascia, the board that closes the ends of the rafters. Behind and beneath the fascia is the soffit. From the front you see the fascia and gutter; from underneath you see the soffit.
| Part | Where it is | What it does |
|---|---|---|
| Fascia | Vertical board along the eaves, fixed to the rafter ends | Closes the end of the roof frame and carries the gutter |
| Soffit | Flat panel under the overhang, level with the ceiling line outside | Closes the gap to the wall and, if vented, lets air into the loft |
| Gutter | Channel clipped to the fascia, just below the roof edge | Collects rainwater and carries it to the downpipe |
| Downpipe | Vertical pipe down the wall | Takes the water from the gutter to the drain or a soakaway |
| Bargeboard | Sloping board along the verge of a gable | Covers the end of the roof timbers and the edge of the covering |
Eaves is the word for that low overhanging edge, and it is where trouble tends to begin on an old house. It is the lowest point of the roof, the point where water is concentrated, and the place where timber, brick or stone and pipework all meet.
The fascia board: the part you can see
The fascia is a long, narrow board, fixed to the foot of the rafters, running level along the eaves. It does two jobs. It hides and protects the ends of the rafters, which would otherwise be open to rain and birds. And it provides a solid fixing for the gutter brackets.
Why the fascia takes the load
A gutter holds weight. A full length of gutter in heavy rain carries a lot of water, and in a cold snap it can carry ice. That load pulls down and outward on the fascia through every bracket. If the board is sound, the screws hold. If the board has gone soft with damp, the screws pull out, the gutter sags and the water spills down the wall. This is why we press-test the timber at a survey, and why a failing gutter is sometimes a failing fascia in disguise. See rotten fascia boards for what the signs look like.
Timber, plastic and metal
Fascias were once always timber, painted. Plastic boards (uPVC) and aluminium are now common. Each has its place, and on an older or protected house the right answer is often timber. We compare them in uPVC, timber or aluminium fascias.
The soffit: the panel you rarely look at
Soffit simply means an underside. On a house it is the flat board or panel fixed beneath the overhanging eaves. Without it, the gap between the wall and the roof edge would be open, and birds, wasps and weather would find their way into the loft.
The soffit as a vent
The soffit often does a second job: it breathes. A cold loft needs air to move through it, to carry off the moisture that rises from the rooms below. Marley, citing BS 5250, gives 25 mm of eaves ventilation for pitches of 15 degrees or less under a non-breathable underlay, and 10 mm above that. Where the underlay is breathable and the ceiling below is well sealed, ordinary eaves construction of about 3 mm is, it says, all that is required. These are typical manufacturer figures, and the detail depends on the roof, so we check them at the survey. A vented soffit has slots or a continuous strip through which the air passes. Our guide to soffit ventilation goes into the options.
Signs of a failing soffit
Stained or bubbling paint, black spots of mould and boards that have sagged or split all point to water or condensation. Gaps are an invitation to nesting birds and bats. Both are protected, so if you suspect either, tell us before any board is taken down, and the work can be planned around them.
Gutters and downpipes: the drainage
The gutter is the only part of the set that exists purely to move water. It is a shallow channel clipped to the fascia, set to fall very slightly towards the outlet. Manufacturers typically recommend a gentle slope of between about 1:600 and 1:350 depending on the system; Brett Martin gives 1 mm for every 600 mm, and FloPlast says 1:350 is recommended if fitting to a fall. The outlet feeds a downpipe, and the downpipe carries the water to a drain or a soakaway. Our guides to the fall of a gutter and to downpipes take it from there.
Brackets and support
Brackets hold the gutter at the right height and fall. FloPlast's installation guide for its MiniFlo system says fascia brackets should be no more than 500 mm apart on straight runs. Brett Martin advises supports at no more than 900 mm. The two figures are for different systems, so the right spacing depends on the product. Too few brackets and the gutter sags between them; see a sagging gutter.
Cast iron and asbestos cement
Older houses in the valleys often have cast iron gutters, which are heavy and need strong brackets, as the cast iron gutters guide explains. Some rainwater goods on mid-century buildings are asbestos cement. Where an asbestos cement gutter is whole, HSE guidance puts its careful removal in the non-licensed category. Breaking it up changes that, so nobody should smash or pressure-wash it.
Gutter versus fascia: why the two are confused
The question turns up in almost every conversation about the roofline, and the answer is simple. The fascia is a board; the gutter is a channel. The fascia is part of the building, fixed to the roof structure. The gutter is a rainwater fitting, fixed to the fascia. One holds the other up.
How a fault in one shows up as the other
When a gutter overflows, the water runs down the back of it and soaks the fascia. A fascia that stays wet rots from the top edge. So a gutter fault can become a fascia fault. In the other direction, a rotten fascia lets the gutter drop, which stops water reaching the outlet. The two parts are replaced together more often than not, because replacing one exposes the other.
That is also why a quote for "new guttering" should say whether the fascia behind it has been looked at. A new gutter fixed to a weak board will fail for the same reason the old one did.
If a gutter has been dripping or overflowing in the same place for a long time, ask for the fascia behind it to be pressed and photographed before the gutter is replaced.
What we look at on each part during a survey
A survey of the roofline starts at the ground and works up. We want to see how the water moves before we touch anything, so on a wet day we look at which joints drip and where the wall below is stained. A green streak on the masonry under a corner, or a dark tide mark beneath a joint, points to the exact place where water is leaving the system.
Fascia and bargeboard
We press along the board with a bradawl or screwdriver tip, particularly at joints, at the underside edge and behind the gutter brackets. Soft timber, flaking paint and daylight in a joint tell us how much of the board is sound. Where boards are uPVC or aluminium the questions are different: are they bowed, are the joints open, and are the fixings still biting into timber that has not moved?
Soffit
From a ladder or tower we look at the soffit for stains, sagging and gaps, and check that the vents are clear. If there is a pre-1980s board that looks like fibre cement, we stop and treat it as possibly asbestos cement until proven otherwise.
Gutter and downpipe
We check the fall by eye and by running water, look at the joints for sealant failure, and check the outlet and the downpipe for blockages. Cleaning is often all a gutter needs; the gutter cleaning guide explains how often. Every part is photographed on its own, and the pictures travel with the written quote.
The set working together
The roofline works as a chain. The roof covering sheds water into the gutter, the gutter feeds the downpipe, the fascia holds the gutter and the rafter ends, and the soffit closes the eaves and lets the loft breathe. Break one link and the others suffer. A leaking gutter wets the fascia and the soffit. A blocked soffit vent lets damp build up in the loft. A rotten fascia brings the gutter down.
Why the order of work matters
On a replacement job the gutters come off first, then the fascia and soffit boards, then the rafter ends are checked. New boards go on, then the gutter and downpipes are refitted last, and the fall is tested with water. We do not fit new gutters to old boards that we have not inspected. Costs for the whole set are in fascia, soffit and gutter replacement costs, and materials in uPVC, cast iron or aluminium gutters.
On older and protected houses
Stroud District has 41 conservation areas, and the council advises checking its planning team before changing details on a protected building. A timber fascia and a cast iron gutter may be exactly what the building needs, which is why we describe the roofline part by part in the survey notes and photographs rather than offering one standard package.