The short answer
They might be. Soffit boards, fascias and some gutters on older houses and extensions were often made from asbestos cement, a hard, grey, cement-based sheet. You cannot confirm it by looking, so treat any suspect board as asbestos until a sample says otherwise. Leave it intact, do not drill, sand or scrub it, and get it tested before any work starts.
Where asbestos cement turns up on a roofline
Asbestos cement is a mix of cement and asbestos fibres pressed into flat sheets or moulded into profiles. It was cheap, fireproof and long lasting, so it found its way into many parts of older buildings. On the roofline, the most likely places are the soffit, the flat board on the underside of the roof overhang, spanning from the house wall out to the fascia. It was also used for fascia boards, bargeboards, and for the guttering and downpipes on some garages, outbuildings and extensions.
The soffit is the one most often missed. It sits above head height, it is painted over, and few owners ever look at it closely. Flat soffit panels fixed with small nails or screws at regular spacing, in a grey or off-white board with a slightly rough, dull face, are typical of the older sheet.
A house does not need to be old to be affected, because a later extension, porch or garage may carry older-style boards even where the main house has been re-clad. For that reason it is worth checking each part of the roofline separately rather than assuming one answer fits the whole building.
Our wider guide to soffits and fascias explains what each board does, which helps when you are working out what you are looking at.
What gives it away, and what does not
Appearance can raise suspicion but it cannot settle the question. A few clues are worth noting before you speak to anyone.
- The age and type of the building. Older houses, garages, lean-tos and outbuildings are more likely to have asbestos-cement products than a recent extension.
- The material itself. Asbestos-cement boards are stiff and brittle, grey or cream, and usually thin. They tend to crack across rather than splinter, which timber and plastic boards do not.
- The profile. Flat panels with a plain face and screw or nail heads at even spacing point towards a board product. Corrugated sheet is common on garages and sheds.
- The surface. Weathered boards often show a chalky face, green algae or a pitted texture where the cement has eroded.
None of this proves anything. Some modern fibre-cement boards look much the same and contain no asbestos, and painted timber or plastic can sit alongside genuine asbestos cement on the same house. A paper trail helps, such as a survey, a building file or the record of an earlier job, but without one the only reliable answer is a laboratory test on a small sample.
Do not break a piece off to see what is underneath. Snapping, scratching or drilling the board is the very thing that releases fibres.
Intact is one thing, damaged is another
The risk with asbestos cement comes from fibres getting into the air, and that mostly happens when the material is broken, cut, drilled, sanded or scrubbed. A sound board that is left alone, sealed on its face and not crumbling, is generally a lower worry than one that is cracked, flaking or weathered to a powdery surface.
That is why the first rule is simple: leave it be. Do not pressure wash a suspect soffit or gutter, since the jet can strip the face and scatter debris across the garden and the drive. Do not scrub it with a stiff brush, drill through it to fix a light or camera, or sand it back for repainting. Keep children and pets away from any area where pieces have fallen.
If the board is damaged, or has dropped debris on the ground below, stop and take advice before sweeping it up. Wet-wiping and bagging are the usual starting points, but the safest route is to have it assessed. Do not use a household vacuum, since an ordinary machine can blow fibres back into the room.
Getting it tested and what removal involves
If you suspect asbestos and the roofline needs work, the next step is identification. A sample taken carefully and sent to an accredited laboratory gives a definite answer, and you can arrange this yourself or ask the person quoting for the work to do it. Until you have the result, assume the worst and keep the surface undisturbed.
The HSE sets out the rules for the work. Its guidance treats the removal of asbestos-cement sheet as non-licensed work when the sheet comes off carefully and whole. Where the sheet would be smashed into fragments and release heavy dust, the job is classed as notifiable non-licensed, with extra steps attached. You can read the rules on the HSE page on non-licensed work.
In practice, careful removal means dampening the board, taking out fixings rather than snapping the board across them, lowering whole pieces rather than dropping them, and wrapping and labelling the waste for a licensed tip or carrier. Waste has to go to a site that accepts it. It cannot go in a skip alongside general rubbish.
Cost depends on the amount of board, the height, the access and the disposal. MyBuilder's 2026 cost guide reports general asbestos removal at about £50 per square metre for typical UK jobs. Our own price is fixed once we have surveyed.
Replacing the roofline once the board is out
Once asbestos-cement boards are out, you can choose what replaces them. Timber and uPVC are the usual options for soffits and fascias, and aluminium or cast iron for gutters, each with its own cost and look. Our page on whether aluminium gutters are worth it covers one of the stronger alternatives for a long-lived run.
Ask B&NES planning before changing the material or profile if the home is listed or lies inside a conservation area, because a like-for-like swap is handled differently from a new style. At a gable the same kind of board can also follow the sloping end of the roof, so have those looked at in the same visit. Our short guide to bargeboards explains how they differ.
A roofer working at height on the edge will be near every board on the house. That is the moment to find out what you have, before a ladder is leant on a brittle board or a drill goes through one. Our survey costs you nothing, and the photographs we take along your own roofline let us flag a suspect board before anyone works near it. A written, fixed price comes afterwards. The wider range of gutter, soffit and fascia work we handle is set out on our hub page.
