Fire stopping in St John's
Looking for fire stopping in St John's? It’s simple: send details, get a quote, we seal, guaranteed.
- Fire seals cut back for extra cables and never reinstated
- Improvised or mixed-product fire seals
- Fire sealant pulled out of the opening
Fire stopping in St John's
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Fire stopping in St John's
It helps to set out our role at the start. The designer, fire engineer or building control decides which fire stopping is required. We fit the specified fire-rated sealant following that specification and the maker’s installation guidance on sites in St John's. Site teams most often ask us about expanding foam used as fire stopping and damaged fire seals in risers and voids, on service gaps in risers, joints between fire-resisting walls and floors and small duct penetrations where the tested detail allows. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in St John's is the same: the right product in a properly prepared joint.
In places the size of St John's, fire-resisting walls and floors are found in schools, care homes, health centres and mixed-use buildings. Specified fire-rated sealant goes around new services there, built to match the manufacturer’s detail.
Every job is signed off with a 12-month guarantee. It’s a plain promise: if our work fails within that year, we put it right.
- Where
- St John's (GU21, GU22)
- Region
- Surrey
- Guarantee
- A 12-month guarantee
- Price
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Common questions from St John's clients
Do you work on fire-rated sealing in hotels in St John's?
Yes, to the specification and the product’s tested detail. Work is done room by room so the hotel keeps trading; design and sign-off stay with the designer and building control.
What does the BS 476 change mean for fire-rated sealant in St John's?
References to BS 476 classes are being removed from Approved Document B from 2 September 2029, after which BS EN 13501-2 classification is the route, subject to transitional arrangements. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.
Can the building stay open while you work?
Yes, with some planning. Tell us your site hours and access windows and we’ll plan around them.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.
Can you work to our specification?
Yes. We follow the specification, along with the manufacturer’s installation guidance.
Can you quote from photographs?
Photos, drawings or a schedule are often enough to quote. Where they aren’t, we arrange a site visit.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Nearby places to St John's
More services for St John's
Site staff or a sealant specialist?
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
When it isn’t the sealant
Not every problem is a sealant problem, and we are upfront when that’s the case. It won’t fix:
- Openings that need collars, wraps, batts or boards rather than sealant
- Deciding what a wall or floor needs, which belongs to the designer
- Approving the work on behalf of building control
If in doubt, speak to us on 01277 525 020 or email us and we will say what we think.
Surfaces we seal
- Service gaps in risers
- Cable penetrations
- Linear gaps at wall heads
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Pipe penetrations
Diagnose, treat, 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. If neighbouring businesses or buildings around St John's need work too, visits can be combined. Mention the building’s opening times and we’ll work within them.
- We read the specification, drawings or penetration schedule you send and ask about anything unclear.
- On site, each opening is checked against the tested detail it is meant to follow.
- Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
- We fit the backing the detail asks for, to the stated depth.
- Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
- Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.
Preparing the site
- Arrange parking or a loading space
- Flag any permit to work we’ll need
- Tell staff and tenants when we’ll be in
Ask for a quote
For a fixed quote, give us a call on 01277 525 020 or email a schedule or drawings with the site address and an outline of the work. You can also send details through our quote form.
Advice
How the quote is worked out
A fixed quote reflects the actual work. It takes account of:
- Induction, permit and paperwork requirements
- How much there is to seal
- Backing rod, priming and other preparation
- Working within restricted access windows
There’s no price list, since every building and every scope is different. Call for a quote.
Sending details for a quote
To price the job accurately, we need a clear picture of the site. Send us:
- Where the site is, with the postcode
- Rough lengths or quantities, or drawings if you have them
- Photos of the joints, close up and from further back
- Any dates the work must fit around
Photos, drawings or a schedule of the joints are often enough for a fixed quote. If the job needs a look first, we will arrange a site visit.
Penetration seals near St John's
For England, the fire stopping of penetrations is dealt with in Approved Document B. From 2 September 2029, BS 476 references are being taken out of Approved Document B, leaving BS EN 13501-2 classification as the route, subject to the Government’s transitional arrangements. We install whatever has been specified, to the product’s tested detail. Central London is about 25 miles from St John's. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls; the gaps need the specified seal.
On estates like Goldsworth Park Trading Estate, 0.9 miles north of St John's, the wall between office and warehouse is often fire-resisting, and cables through it need the specified seal. At a college such as Woking College, 2.1 miles east of St John's, checking penetration seals after summer M&E works is good practice.
St John's is about 1 mile west of Woking, in Surrey. Businesses, contractors and managing agents in St John's can call on us for service penetrations, as part of our coverage of Surrey. Across Surrey, 379 places are covered, including St John's. Our Reading page has more on work in that area.
If you need fire stopping in GU21 and GU22, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. If your site is on Pond Road, Copse Road and Raglan Road or close by, send details and we’ll quote for service penetrations. Being close to the A324, St John's is straightforward for us to reach. Nearby places we also cover include Goldsworth Park (1 mile north-east), Woking (1 mile east), Westfield (2 miles south-east), Horsell (2 miles north-east) and Mimbridge (2 miles north). Further afield, our area takes in Guildford (5 miles south), Camberley (6 miles west), Epsom (14 miles east), Farnham (11 miles south-west), Ewell (15 miles east) and Egham (8 miles north).
Around St John's
In St John's, that means premises near Hoe Valley School, The Oaktree School and Royal Oak pub and the streets around them. For rail, the closest station is Woking station, about 1.6 miles east. Well-known places in the area include Brookwood Hospital (1 mile west) and The Peacocks (1.6 miles east). Green spaces nearby include Brookwood Lye.
Surface by surface
Masonry and concrete
Core-drilled holes are neat; broken-out ones rarely are. The gap is measured at the widest point against the detail’s limits, and any that don’t are flagged.
Plastic pipes
In a fire, plastic pipework melts away and leaves an opening. Some intumescent sealants are tested on smaller plastic pipes, but many need a collar or wrap. We confirm material and size first and tell you if sealant isn’t the right product.
Common problems we fix in St John's
Fire stopping can get squeezed at the end of a programme, or done by whoever is on site. That is how unsuitable products and improvised details end up in compartment walls.
Common reasons buildings call us in:
- Unsealed penetrations discovered above suspended ceilings
- Seals that don’t match their tested detail
- Fire seals cut back for extra cables and never reinstated
- Openings left by services added after handover
In a hotel such as Gorse Hill Hotel, 0.7 miles south of St John's, new pipework or cabling through bedroom and corridor walls needs sealing with the specified product.
Comparing quotes
- Will CSCS-carded applicators be on site?
- The terms of the workmanship guarantee
- Will failed sealant be removed rather than covered?
- What level of public liability insurance do they hold?