Replacing Fascia, Soffit and Bargeboard

The Word That Separates the Two Prices

Somewhere in the middle of the cheaper quote there is a verb. Overclad. Cap. Wrap. Encapsulate. It means the existing timber stays on the building and a plastic profile is pinned over the front of it, usually alongside a phrase about the new material being maintenance-free — true of the plastic, and silent about the wood behind it. The dearer quote says strip, or remove and renew, and carries a line for waste. The frontage is identical, the colour when it is finished is identical, and what differs is whether anybody looks at the ends of the rafters.

That matters because a domestic fascia is not trim. It is the fixing point for the gutter, which on a wet winter morning holds a load nobody weighs and in a freeze holds considerably more; it sets the kick of the eaves course and holds the lower edge of the covering off the batten; and on most houses it is the only thing that has kept weather off the last hand-span of every rafter for thirty or forty years, a job it has done by taking the water itself. When a fascia is soft, the question is never whether to replace the fascia. It is what the fascia has been protecting, and how much of that is left.

Nobody can answer that from the drive, the installer quoting from it included. But a surprising amount can be established before anybody commits, and the parts that genuinely cannot be established can be written into the contract as a rate rather than met as a surprise. What follows is the order in which the evidence becomes available, which is also the order in which the two prices stop being comparable.

Two Jobs Wearing the Same Materials List

Set the two scopes against each other line by line and the material content barely moves: both price white board along the same frontage, soffit across the same overhang, and the gutter down and back up. Labour diverges a little, disposal diverges a lot, and what genuinely diverges is the information the building hands over during the work — which appears on neither quote, because information is not a line item.

One asymmetry is what makes the cheaper price cheaper: a capping quote has priced the certainty of not looking. If the tails are sound, the capper is right and has saved the client a strip-out. If they are not, the capper has sealed damp decaying timber inside a vapour-tight jacket, hung a gutter off it, and moved the discovery date forward by nobody knows how long. That is not a criticism of every capping job; it is a description of the bet, and the bet is the client's to take rather than the installer's to make quietly.

The second asymmetry is geometric and almost never mentioned. A capping profile plus the packing needed to bring a wavy old board into one plane pushes the face of the fascia outward, typically by ten to twenty millimetres, and the bracket line goes with it. On a tiled roof the eaves course was set to discharge into the trough; move the trough out and the tile edge sits closer to the back of the gutter, and on a shallow overhang it can end up discharging behind it. BS 5534, Slating and tiling for pitched roofs and vertical cladding, treats the relationship between the eaves course and the gutter as part of the detail rather than an accident of installation, so it earns a string line before the first profile goes up instead of a callback about water tracking down the wall.

What the Ground and the Loft Give You for Nothing

Before either quote is accepted there is an inspection that costs a ladder, a torch and an hour, and it settles most cases. Start with the paint, because a timber fascia fails in a pattern: coatings crack and lift where water has been sitting behind them, and the giveaway is not general weathering across the run but local blistering under a gutter joint, at a stop end, below an outlet, or in the last metre before a valley discharges. A fascia that has lost its paint uniformly across three elevations has been neglected; one with three clean-edged blisters in twenty metres has been leaking at three known points for years, and those are the points where the board behind will be soft.

Then look up. Staining on the soffit, a board bowed between fixings, moss along the top back edge of the fascia where the underlay stops short, a green tide mark on the wall under a gutter joint: each is a water route, and each has been depositing on the same fifty millimetres of rafter for a decade. Grilles painted shut or packed with nest material say something else, which the roof will present as a bill in a different winter.

The loft usually decides it. Go up on a bright day, turn the light off and look along the eaves — in a cut roof you can often see and reach the last three or four hundred millimetres of the tails. Feel for damp under the sarking, look for black staining on rafter sides near the plate, and check whether the underlay is carried over a tray into the gutter or stops short and has been shedding onto the wall plate for the life of the roof. That last defect is the commonest reason rafter feet rot, and it is visible from inside without touching anything. Note whether the roof is cut or trussed while you are there.

1. Photograph each elevation at full zoom, then walk it for local paint blistering rather than general weathering.
2. Look along the soffit line for bowing, staining and grilles painted or packed shut.
3. Check the wall below every gutter joint, outlet and stop end for a persistent tide mark.
4. From the loft with the light off, look for daylight along the eaves and black staining on rafter sides near the plate.
5. Establish whether the underlay reaches the gutter or stops short over the wall plate.
6. Record whether the roof is cut or trussed, and whether the fascia is what carries the gutter.
7. Give both bidders the same photographs, so the two quotes answer one description of the building.

Probing the Rafter Feet

Once a board is off, the test takes a bradawl and about four seconds per rafter. Push it into the end grain and into the top of the tail with firm hand pressure: sound seasoned softwood resists past two or three millimetres and the point has to be worked in, while decayed timber takes the awl to the handle with the resistance of cork. A screwdriver is the wrong tool because it only tells you the surface is soft; an awl tells you how deep the softness goes. Probe the last hundred and fifty millimetres, the top edge where the underlay has been dripping, and the point where the tail crosses the wall plate.

Read the pattern rather than counting failures. Decay following a known water route — under a gutter joint, below a valley outlet, at a stop end — is localised, and localised decay in a cut roof is a repair. Decay spread evenly along a whole elevation means the underlay detail is wrong along that whole elevation, and replacing the boards without correcting it resets the clock on the same failure. If you find white or grey strands running across masonry, or a fleshy fruiting body, stop calling it a fascia job: true dry rot travels through the fabric and needs identifying by somebody qualified to identify it.

Check the wall plate under the soft tails, not just the tails. It is what the roof bears on, it sits on the inner leaf where it is easy to wet and hard to see, and it cannot be spliced from a ladder in an afternoon. A soft one turns this into a structural repair with propping, and the honest response is to stop rather than nail a new board over it and quote for scaffolding later.

Trussed roofs need naming separately because the geometry misleads. The projecting tail is a member of a metal plate connected truss, so cutting, notching or sistering it modifies an engineered component. ANSI/TPI 1, the National Design Standard for Metal Plate Connected Wood Truss Construction, and the SBCA and TPI Building Component Safety Information guidance both put alterations to a truss with the truss designer rather than with whoever is on the scaffold. A rotten tail on a truss is therefore a design query with a lead time, and the quote that assumed a morning's carpentry has already lost its programme. Where the tails are sound and the boards are simply tired, say so: overcladding sound timber is a legitimate cosmetic decision, and pretending otherwise to justify a strip-out is as dishonest as capping a rotten eaves.

The Bargeboard Has Nothing Catching Its Water

A fascia has a gutter under it for most of its length. A bargeboard has open air. It takes driven rain on its full face, it takes the runoff of the verge along its top edge, and its end grain at the apex and at the foot sits in the two wettest positions on the gable. On most houses that come up for this work the bargeboards are in worse condition than anything at the eaves, and they are the boards a ground inspection judges least well, because they are seen edge-on from below.

What sits behind them varies, and the variation is the whole risk. Some are fixed straight to a barge rafter that is part of the roof structure. Many on modern gables are fixed to a ladder frame — noggins cantilevering out past the wall, carrying the verge and the board together. Where a bargeboard has been soft for years the noggins behind it usually have been too, and a ladder frame with rotten noggins is not trim: it is what the overhanging verge stands on, and replacing it is framing work with its own access and its own sequence.

Taking a bargeboard off disturbs the verge above it however that verge was finished. Bedded mortar comes away in pieces and cannot be reused; a dry verge system unclips and often will not go back without new units, because the fixings are consumed. Whether it should go back as mortar or as a dry system, and what wind exposure at a gable demands of it, is covered in the guide on dry-fixing ridge and verge — but it has to be a priced line here, because a bargeboard quote that stops at the board leaves the roof open along its most exposed edge.

Fixings, Movement, and What Goes Wrong in Year Three

The first winter tells you nothing. Failures here surface in the second and third year. Fasteners come first: plain galvanised nails driven into damp timber bleed rust down a white board within a season, and the answer on any exposed or coastal site is a stainless fixing or a polymer-headed pin matched to the board and driven to the manufacturer's pattern rather than to whatever is in the gun. Overdriven pins dimple a plastic face permanently, and the dimple collects dirt.

Plastic moves. Cellular PVC and foiled uPVC expand and contract far more over a temperature swing than the timber they replaced, which is why the manufacturer's published installation instructions carry an expansion allowance at joints and terminations. A long run fixed hard at both ends with joints closed tight in February bows visibly in July, and the bow does not come out. The compound is classified under ASTM D1784, Standard Classification System and Basis for Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds, but the movement allowance is a product instruction rather than a standard and varies enough between systems to be worth reading.

If the replacement is timber, durability has named documents behind it: BS EN 335, Durability of wood and wood-based products, Use classes, puts exterior joinery above ground in use class 3, BS 8417, Preservation of wood, Code of practice, covers the treatment, and the North American equivalent is the American Wood Protection Association Standard U1, Use Category System, User Specification for Treated Wood. All of them assume the thing almost nobody does, which is re-treating every cut end and drilled hole before it is fixed. An untreated cut end at a scarf joint is where the next rot starts, inside the joint, where nothing shows.

One risk belongs before any of that. Soffit boards on houses built up to the mid-1980s are frequently asbestos cement or asbestos insulating board, and the two are handled very differently: in Great Britain under the Control of Asbestos Regulations 2012, with HSE guidance HSG264, Asbestos: The Survey Guide, insulating board work is normally licensed while asbestos cement usually is not, and that classification is made by a competent person rather than from a photograph. In the United States the controls are OSHA 29 CFR 1926.1101 and the EPA asbestos NESHAP at 40 CFR Part 61 Subpart M. A strip-out quote with no line for identification or controlled removal has not been priced for the building it is parked in front of — and this is one of the few places where capping's avoidance of disturbance is a real argument in its favour rather than an evasion.

The One Condition That Settles It

Reduce all of it to a single test. If the fascia carries the gutter and the rafter feet behind it are soft, capping is not a cheaper option — it is a different, worse option at a similar price, because the new bracket line is being fixed into failing timber and the failure is now sealed in and invisible. No amount of product quality changes that. If the tails are sound and the boards are merely weathered, capping is a reasonable cosmetic choice honestly made, and it should be taken without apology.

So the useful thing to demand of both bidders is not a lower price but a stated position on discovery. Ask the capping bidder to open the fascia at a named number of positions — the ends of each elevation, plus every point where the ground inspection found local blistering — and to state in writing what happens if the tails fail the probe. Ask the strip-out bidder for a rate per tail repair and per metre of plate, so work found is priced before it is found rather than negotiated from a scaffold. A bidder who cannot answer either question has not priced the job; they have priced the board.

Then, on the day the eaves is open, photograph every metre of it before the new boards go on. It costs nothing, it is the only record that will ever exist of what is behind that line, and it is the document that settles the argument in fifteen years when somebody else is standing in the drive holding two quotes and one of them says overclad.