Fire Stopping in Harwell
Fire-rated and intumescent sealing of service penetrations and linear gaps in Harwell and across Oxfordshire. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Non-fire-rated filler around services
- Old intumescent sealant that has split away
- Damaged fire seals in risers and voids
Fire stopping for Harwell sites
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Fire stopping for commercial buildings in Harwell
Fire-rated sealant suits many small service penetrations: copper and steel pipes, cables and some small ducts where the tested detail allows. Other openings need collars, wraps, batts, pillows or boards. If the detail calls for something other than sealant, we say so rather than force sealant into it. The enquiries we see most involve fire-stopping items raised at inspection or handover and fire stopping installed outside its tested range, on pipe penetrations, service gaps in risers and linear gaps at wall heads. Whoever orders the work in Harwell, the brief is typically the same: a clear scope, tidy work and joints that don’t fail again.
Around Harwell, penetration and linear seals tend to be one-building jobs. Send the specification, drawings or photographs of the openings and we will quote to suit.
Whoever the client is, the cover is the same: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Location
- Harwell (OX11)
- Region
- Oxfordshire
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Looking after the joints
Problems stay small when the joints are checked regularly. Specifically:
- Record which product was used where
- Foam or ordinary sealant is never a fire-seal repair
- Report damaged or disturbed seals as soon as they’re spotted
- Check with the data sheet before painting over fire sealant
Keep the product data and installation details with the building’s fire safety information. Anyone resealing later needs to know which product and detail were used.
On fit-outs, get the fire-stopping specification agreed before the services go in. Details can then be picked to suit the actual pipes, cables and ducts, and the work runs in step with the M&E.
Common problems we fix in Harwell
Head-of-wall joints and wall-to-wall junctions are frequent weak points. Deflection and building movement can open these gaps, and a product not tested for that movement may crack. The tested detail for a linear joint states the width and movement it covers.
Any of the following is a good reason to get the joints checked over:
- Head-of-wall gaps with no fire seal
- Openings found when ceilings come down for a refit
- Fire stopping installed outside its tested range
- Fire-rated sealant that has cracked or shrunk back
Older community buildings such as Church of St Matthew that have been rewired or given new heating can have service gaps through walls worth checking against the specification.
Before you book anyone
- Their public liability cover
- Whether old or failed sealant will be cut out, not overlaid
- Whether their applicators hold CSCS cards
- How joint depth will be controlled
From enquiry to sign-off
In a busy building, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed, then handed back before the next one starts. For a site in Harwell, we plan so the whole job is done in one go where possible. Photos with rough sizes let us arrive with everything needed.
- We start with your penetration schedule, drawings or specification.
- We plan the sequence of floors, risers and voids with you.
- We compare every service penetration with its tested detail before sealing.
- Unsuitable material is removed and the opening cleaned first.
- Backing and fire-rated sealant are installed to the detail and tooled.
- We tell you about openings that need a different product.
Before we start on site
- Make sure the joints can be reached
- Have the specification and drawings to hand
- Share the asbestos register for older buildings
Ask for a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price against exactly what is specified. For smaller jobs, photos and a description will do.
Advice
Building owners, agents and FMs in Harwell
Whether you are a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.
Building owners and managing agents use us on sealant work across single buildings or whole portfolios around Harwell. Several sites can go on one quote, so there’s one set of paperwork to deal with.
Fire stopping in Harwell: the local picture
Central London is about 52 miles from Harwell. Tenant changes on commuter-belt business parks mean regular fit-outs, and new services through compartment walls. Several hotels sit less than 2 miles from Harwell. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.
Shop fits in centres such as Market Place Shopping Centre, 2.3 miles to the east of Harwell, can bring new services through fire-resisting walls between units, which then need the specified seal. Tenant changes at parks like The Core Business Centre, 1.3 miles north-west of Harwell, bring new data and services, and openings through fire-resisting walls need the specified seal.
Harwell is about 2 miles west of Didcot, in Oxfordshire. We send applicators to Harwell for service penetrations. Across Oxfordshire, 423 places are covered, including Harwell. Oxford is covered too, some 11 miles away.
Work on service penetrations is covered throughout OX11. Buildings on High Street, Loder Road and The Styles are within our area. If your building is just outside Harwell, we cover West Hagbourne (2 miles south-east), Coscote (2 miles east), Upton (2 miles south-east), Chilton (2 miles south) and East Hagbourne (2 miles east). Bigger towns within reach include Oxford (11 miles north), Abingdon-on-Thames (5 miles north), Witney (15 miles north-west), Wantage (6 miles west), Grove (6 miles west) and Faringdon (13 miles west).
What’s near Harwell
In Harwell, that means premises near The Crispin pub, UTC Oxfordshire and UTC Oxfordshire and the streets around them. For rail, the closest station is Didcot Parkway station, roughly 2.3 miles east of the centre. Other landmarks nearby include Atlas Computer Laboratory (2 miles south-west) and Abingdon Community Hospital (4.8 miles north). Green spaces nearby include Churn Hill and Mowbray Fields.
Questions we’re asked in Harwell
Can you work at a site such as The Core Business Centre, by Harwell?
Yes. We cover Harwell and the area around it, including industrial estates, business parks and retail parks such as The Core Business Centre. A few photos and the unit address let us price the work.
Do you work in occupied care homes around Harwell?
Yes. We work around residents’ routines, a room or two at a time. We follow the home’s own procedures throughout.
Is it fine to apply new sealant on top of old?
No. Sealing over old material is one of the classic causes of early joint failure, so it all comes out first.
Do you need to see the site first?
It depends on the job. Straightforward work can often be priced from photos and measurements, while larger or less clear jobs get a site visit first.
Which standards are fire seals tested to?
In short, BS EN 1366-3 and 1366-4 are the fire tests and BS EN 13501-2 is how results are classified. An EI 60 seal kept its integrity and insulation for 60 minutes as tested; installing to the detail is what carries that across to site.
Can one quote cover more than one building?
Yes. Multi-site work and planned programmes are a core part of the service, with each site phased to suit its occupants.
When is resealing likely to be due?
Nobody can honestly give a figure in years, since movement, weather, cleaning and use all affect it. Regular inspection is the best way to catch problems early.
Site staff or a sealant specialist?
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.
Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
Why deal with it now?
It is cheaper to seal service penetrations as each services package finishes than to come back for them later. Openings are visible, access is open and nothing has to be taken down, and the right detail can be checked at the time. Sealant hardens, cracks and loses grip with age, UV and movement. Replacing it before it fails keeps water out.
What a job costs comes down to the quantity of joints, what has to come out first and the access. Call for a fixed quote when you are ready.
Why us?
- Fixed quotes based on photographs, drawings or a visit
- Specification-led, product-correct work
- Constructionline member
- One contact handling all your sites
Take a look at how commercial sealant jobs are priced or our accreditations and insurance.