Keynor Estate fire stopping
Fire-rated and intumescent sealing of service penetrations and linear gaps across Keynor Estate, by CSCS-carded applicators. CHAS accredited and fully insured.
- Unsealed openings around new pipes and cables
- Old intumescent sealant that has split away
- Openings found when ceilings come down for a refit
Fire stopping for businesses in Keynor Estate
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Do you need fire stopping in Keynor Estate?
Physical damage is another reason seals stop doing their job. Seals get knocked during maintenance, cut back to add a cable or pulled out when services are swapped.
These are often picked up first by site or facilities staff:
- Expanding foam used as fire stopping
- Old intumescent sealant that has split away
- Openings left by services added after handover
- Unsealed penetrations discovered above suspended ceilings
Office fit-outs on sites such as Enborne Business Park, 0.5 miles to the south-east of Keynor Estate, add cabling and pipework through fire-resisting walls, and fire-rated sealant goes in where the specification calls for it.
What to look for in a quote
- How they’ll work around occupants
- Will CSCS-carded applicators be on site?
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- What the guarantee covers, and for how long
Fire stopping for commercial buildings in Keynor Estate
Opened ceilings and riser doors often reveal service openings nobody sealed. If a specification already covers those walls and floors, we can reseal to it, matching the product and detail it names. With no specification in place, the first step sits with your designer or fire engineer, not with us. The enquiries we see most involve builders’ foam or ordinary silicone in compartment walls and damaged fire seals in risers and voids, across cable penetrations, small duct penetrations where the tested detail allows and joints between fire-resisting walls and floors. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Keynor Estate, that means joint design, primers and backing rod as standard.
For a smaller site near Keynor Estate, we plan to do all the penetrations in one go, with the specification and photos sent in advance. Design and sign-off belong to the designer or building control; we install what’s specified.
Our workmanship is guaranteed for 12 months, in Keynor Estate as everywhere else we work. If our installation lets you down in that time, we return and fix it.
- Where
- Keynor Estate (PO20)
- Region
- West Sussex
- Guarantee
- 12 months on our workmanship
- Quotes
- Quoted before any work starts
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
How a job runs
We schedule the visit to fit the site hours and access windows you give us. While we are working, the area stays contained and tidy, and your contact hears from us before we move to the next area. Rural sites near Keynor Estate may need directions, gate codes or a contact on site. Send that with the details and we will confirm the plan with the quote.
- We start with your penetration schedule, drawings or specification.
- Access, permits and the order of areas are agreed with the site team.
- We compare every service penetration with its tested detail before sealing.
- Unsuitable material is removed and the opening cleaned so the seal starts clean.
- The specified backing and sealant go in to depth and are finished neatly.
- We tell you about openings that need a different product.
Preparing the site
- Arrange parking or a loading space
- Have the specification and drawings to hand
- Flag any permit to work we’ll need
Request a quote
Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we’ll return a fixed quote that you can work with. For a chat about it beforehand, ring 01277 525 020 or send details through our quote form.
Related advice
General trades versus a specialist
Putting right a botched joint often costs more than sealing it well at the start, because the whole bead must be removed and the faces cleaned back again. That’s why many clients bring in a specialist from the beginning.
A short, simple internal joint is often within reach of a maintenance team. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Questions about Keynor Estate
Is a smaller place like Keynor Estate outside your area?
No. Places such as Keynor Estate are covered as much as the big towns. Our area covers London and the South East counties. We plan jobs in smaller places so return trips are kept to a minimum.
Could you schedule work at a campus like University of Chichester for the vacation?
Yes, holiday working periods are the norm on campus jobs. Let us know which documents your site asks for, and we will confirm them alongside the quote.
Do you seal on top of existing sealant?
No. Sealing over old material is one of the classic causes of early joint failure, so everything comes out first.
Do you seal openings left by new services?
Yes, provided a specification covers them. Openings left by new services are among the most common jobs we see and we close them with the specified product.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Is fire stopping in Scotland covered by different guidance?
Scotland sets its own building regulations, with Technical Handbooks. Either way, we install the specified sealant to its tested detail.
Is sealant suitable for all service openings?
No. A sealant’s evidence covers set services, gaps and wall or floor types. Outside that, a different product is needed, specified by your designer.
Compartments and services around Keynor Estate
Fire stopping of openings and penetrations in England falls under Approved Document B. The national BS 476 classes are due to drop out of it from 2 September 2029, leaving the European BS EN 13501-2 route, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail. Keynor Estate is about 59 miles from central London. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls, and the gaps need sealing with the specified product.
Campus buildings at universities such as University of Chichester (4.7 miles north-east of Keynor Estate) see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified. On a hospital site such as St Richard's Hospital, 5.2 miles north of Keynor Estate, fire-rated sealant goes in where the specification calls for it, with the work planned around the estates team’s permits.
Keynor Estate is about 2 miles north of Selsey, in West Sussex. Keynor Estate sits inside our coverage, with the same fixed quotes and 12-month guarantee as everywhere else. Keynor Estate is one of 373 places in West Sussex on our list for service penetrations. For work in that direction, see our Portsmouth page.
We take on service penetrations across the PO20 postcode area, whatever the building. Streets here include Chalk Lane and Cow Lane. If your building is just outside Keynor Estate, we cover Sidlesham (1 mile north-east), Street End (1 mile north), Church Norton (2 miles south-east), Sidlesham Common (2 miles north) and Pagham (2 miles east). A short drive away, we cover Bognor Regis (5 miles east), Chichester (5 miles north), Littlehampton (12 miles east), Rustington (13 miles east), Angmering (14 miles east) and Portfield (5 miles north).
Landmarks near Keynor Estate
We work on buildings around The Academy, among other places. For rail, the closest station is Chichester station, about 4.4 miles north of the centre. Well-known places in the area include Selsey Lifeboat Museum (2.9 miles south) and St Richard's Hospital (5.2 miles north).
Leave it or put it right?
Sealing behind the M&E trades area by area beats a sweep at the end. Openings are visible, access is open and nothing has to be taken down, and the right detail can be checked at the time. Converted and older buildings near places like Keynor Estate tend to move, and aged sealant cracks. The right product, sized to the joint, copes much better.
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.
Why choose Mastic Doctor in Keynor Estate
- One phone line for London, the South East and Scotland
- Products installed to the manufacturer’s instructions
- Fully insured
- Constructionline member
Read our cost guide or how we’re accredited.
Also near Keynor Estate
Also in Keynor Estate
How the job changes by surface
Cables and cable bundles
Data cabling added after handover is a regular cause of open service penetrations. Openings around new cables are resealed to the detail.
Plastic pipes
In a fire, plastic pipework melts away and leaves an opening. Small sizes are sometimes covered by an intumescent sealant detail, though larger ones typically call for a collar or wrap. We check the pipe material and diameter against the detail before we start.
Work for main contractors and building owners
For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. Programme, specification and site rules come first.
Whether you’re a managing agent, a property factor or an owner’s representative: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.