Spray foam insulation removal in Bognor Regis

A torch and a look from the hatch show whether foam covers the rafters, and what it was sprayed onto.

You do not need to climb in for a first look. From the hatch, with a torch, foam shows as a continuous cream, yellow or off-white skin across the underside of the roof, clinging to the rafters rather than lying between the joists on the loft floor. Rafters are the sloping timbers that carry the roof, and a traditional loft shows them as bare, dusty wood with felt or underlay visible between. If the timbers have vanished under a smooth or lumpy coating, you have foam. Keep to the boards or joists, take a torch and a phone for photographs, and do not cut into the coating to see what lies behind it, because a cut disturbs the very evidence a survey needs.

2.1 Open-cell and closed-cell foam

Two types are in circulation. Open-cell foam is softer and spongy once set. Closed-cell foam is denser and sets hard, bonding tightly to whatever it was sprayed onto. The difference matters on a roof that has ever leaked. The Energy Saving Trust, in guidance last updated in May 2026, does not recommend spraying foam onto a leaking roof without fixing the leak first, and says the risk should be much lower with an open-cell foam. Underlay, the felt or membrane under the battens, is where a leak leaves its mark, and foam sprayed over it hides the evidence.

2.2 What lies behind it

A ventilated roof is designed around air moving through the loft. Marley's guidance for a high-resistance underlay asks for 10 mm of continuous ventilation along the eaves on pitches above 15 degrees. Foam applied hard against the underside changes that arrangement, and bungalow lofts with shallow pitches have little spare room for air to move, and the questions a surveyor then asks are about timber: is it dry, sound and free of rot? Nobody can answer that for a rafter they cannot reach. Worth noting from below are a musty smell, stains on the bedroom ceilings, and anything dark or damp-looking where the foam meets the wall plate, the timber laid along the top of the wall that the rafters sit on.

Photograph what you see before anyone touches it: the foam from several angles, the eaves, the ridge end and any hatch or pipe where the coating stops. Send them with the survey report, if there is one, and the date of installation if you know it. Those photographs let us say whether a visit is needed at once or whether the roof is stable enough to wait. For a fuller look at what an inspection covers, see our spray foam survey guide, or our wider roof inspections and surveys service.

There are two routes to the timber, from inside the loft or from the roof covering, and the foam decides which one is open.

The method depends on the type of foam, how thick it is and what it was sprayed onto. Foam on bare rafters can sometimes be cut and scraped back by hand from inside the loft. Foam that has stuck fast to the underlay, or was sprayed against the back of the tiles, may only come off if the covering is lifted in sections and the foam taken away from above. The survey decides which, and we explain why before you agree to either. Our guide to how spray foam is removed from a roof follows the stages in more detail.

4.1 Why care matters

RICS warns that removal could potentially damage the existing structure, and that is the right thing to keep in mind. Foam sticks to timber, so pulling at it carelessly can take splinters of rafter with it, tear felt and loosen battens. The work is slow, tidy and done in sections, with dust sheets down, the loft contents protected and the rest of the house kept clean. Foam waste is bagged and taken off site with the other waste, and the site is left clear.

4.2 What happens to the timber afterwards

Once the rafters are bare, we probe them for softness and look for staining, fungal growth and rot. Sound timber stays as it is. Timber that has gone soft is cut out and replaced or strengthened, and we tell you what we found with photographs before any extra work goes ahead. The felt is then checked, torn lengths are renewed, and the battens and tiles are put back or replaced to suit the roof. Ventilation at the eaves and the ridge is restored, so the loft can dry out again. If you plan to insulate afterwards, wait for that advice, because the insulation has to suit the ventilation.

4.3 Working with the weather

Lifting a roof covering exposes the house, so the work is planned around the forecast. Sections are opened only as far as can be sheeted before dark, and anything left open overnight is covered. On a coastal roof in Bognor Regis, where sea weather can turn quickly, that discipline matters more. Higher roofs may need scaffolding. A scaffold that occupies the footway or the carriageway needs a highway licence, issued by the highway authority.

Stripping a roof can disturb bats, a legally protected species, so we look for evidence of roosting before any tiles are lifted. If the foam turns out to sit on a roof that has reached the end of its life, we tell you, and our page on roof replacement explains when a new covering makes more sense than relaying the old one. Our answer on whether removing foam will damage your roof covers the damage question in more depth.

Whatever the roof, listed status, conservation areas and Building Regulations can each add a step before foam comes out.

Foam can sit under any covering. Bognor's seafront terraces around The Steyne and Waterloo Square are slate and stucco, with tall chimneys that Arun's conservation guidance calls important features on the skyline. Aldwick's interwar Craigweil estate is recorded in the council's statement as built of local stock brick with plain clay tiled roofs, and Felpham's village core has orange and red clay tile. The covering, the pitch and the age of the felt all affect how foam can be taken off, which is why each job starts with a survey and not a standard method.

6.1 Listed buildings and conservation areas

RICS says spray foam must not be installed in a listed building or other protected structure without prior consent. Taking it out is a separate question. Works that would affect a listed building's character as a building of special interest need listed building consent, while routine upkeep and in-situ repairs that match what is there do not, the South Downs National Park Authority says. If your house is listed, or sits in a conservation area, put the question to Arun District Council's planners before anything starts on site. Bognor's Steyne and Waterloo Square conservation area dates from August 1979, with an extension in July 1994.

Where work is notifiable, the consent explanation and the Building Regulations notification are ours to deal with, not yours. A survey visit at your house leads to an off-premises contract, which gives you 14 days to cancel, and work begins inside that window only on your written request. We work across Bognor Regis and the towns within 30 road miles, from Aldwick, Felpham and Pagham to Selsey, Chichester, Littlehampton, Worthing, Havant and Midhurst. Send a few photographs from your loft and we will tell you whether a visit is the next step.