Fire-rated sealing and fire stopping in St Mary's, Southampton
Fire stopping in St Mary's, backed by over 20 years in commercial sealing. Fully insured, with a 12-month guarantee.
- Expanding foam used as fire stopping
- Fire seals cut back for extra cables and never reinstated
- Fire stopping installed outside its tested range
Need fire stopping in St Mary's?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
About our fire stopping in St Mary's
We should be clear about what we do and don’t do. Deciding the specification sits with the designer, the fire engineer and building control. What we bring is careful installation of the specified sealant, to the maker’s guidance in St Mary's and nearby. If you’re dealing with fire stopping installed outside its tested range and open linear gaps along the top of fire-resisting walls, we can help, whatever the surface. Searching for sealant specialists in St Mary's? Mastic Doctor has worked for contractors, FMs and building owners since 2005.
In places the size of St Mary'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.
What our 12-month guarantee covers is the way we did the job: the preparation, the sealing and the tooling. Damage, later alterations by others and movement beyond what the joint was designed for sit outside it.
- Place
- St Mary's (SO14, SO15, SO18)
- Region
- Southampton
- Cover
- A 12-month guarantee
- Quotes
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Compartment walls and floors in St Mary's
The area within 2 miles of St Mary's holds plenty of hotels. Hotels are divided into compartments, and refurbishments that add pipes and cables through bedroom and corridor walls leave gaps to close. St Mary's is about 70 miles from central London. Office refits around the commuter belt bring new cabling through fire-resisting walls.
Campus buildings at universities such as Southampton Solent University (under half a mile north-west of St Mary's) see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified. For a site team at a college like Southampton City College, under half a mile to the south-east of St Mary's, fire-rated sealing is best scheduled after the summer works.
St Mary's is about 1 mile south of Southampton, in Southampton. Looking for fire stopping in St Mary's? We can help. St Mary's is one of 30 places in Southampton on our list for service penetrations.
If you need fire stopping in SO14, SO15 and SO18, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. Streets here include New Road, Ogle Road and Marsh Lane. Close to St Mary's, our area also takes in Northam (1 mile north-east), Inner Avenue (1 mile north), Peartree Green (1 mile east), Southampton (1 mile north) and Bitterne Manor (1 mile north-east). A short drive away, we cover Harefield (3 miles east), Maybush (3 miles north-west), Coxford (3 miles north-west), Lordswood (3 miles north-west), Mansbridge (3 miles north-east) and Redbridge (3 miles west).
Around St Mary's
In St Mary's, that means premises near The Joiners pub, Woolston School and Houndwell Park. The closest station to St Mary's is Southampton Central station, roughly 0.8 miles west. Nearby you will also find Netley Castle (2.5 miles south-east) and Bargate Guildhall Museum (under half a mile south-west). Not far away are Netley Common.
Also near St Mary's
Other services in St Mary's
Should maintenance staff do it?
There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and our CSCS-carded applicators are used to working under those rules.
Site maintenance staff can often handle a short internal joint. Where it goes wrong is preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
Maintenance after handover
Once the work is signed off, a little attention goes a long way:
- Flag new cables with no seal around them
- Make fire stopping part of every scope that crosses a fire-resisting wall
- Look above ceilings when tiles are lifted for other jobs
- Get seals inspected before ceilings and boxing close
Add risers, plant rooms and ceiling voids to routine fire-stopping checks. Look for cracks, unsealed new cables and gaps that have been enlarged, and report them promptly.
Ask every contractor who works in risers or voids to report openings they create. Small habits like this stop openings building up.
What affects the price in St Mary's
The price varies from site to site. Expect it to depend on:
- Removal of failed or old sealant
- Access and working height
- The site’s rules and procedures
- Location, for remote and island sites
We don’t publish prices, because the scope varies so much from one building to the next. For a fixed figure, call for a quote.
Before you send an enquiry
The more we know, the firmer the quote. Helpful details to send:
- Any specification or named product
- The site address and postcode
- Any dates the work must fit around
- The asbestos register, for older buildings
Tell us about the building, the joints and when you need the work done, and we’ll put a fixed quote together. To get it moving, call 01277 525 020 or use the quote form.
Commercial clients in St Mary's
Hotels, schools, healthcare sites, offices and retail units come to us directly as well. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.
As a CHAS accredited contractor and Constructionline member, we are straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.
St Mary's: questions and answers
Do you work on fire-rated sealing in hotels in St Mary's?
Yes, where fire-rated sealant is the specified product. It goes in to the manufacturer’s tested detail for the wall or floor and the services passing through, and we will tell you if the detail calls for a collar, wrap or batt instead.
Could you schedule work at a campus like Southampton Solent University for the vacation?
Yes. Education sites usually want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
How do you deal with asbestos in old sealant?
Asbestos is possible in some older mastics, particularly in buildings from before 2000. We check the asbestos register before cutting out old sealant in an older building, and if asbestos is suspected, work stops until it’s tested. We don’t remove asbestos-containing materials.
Is any job too small?
Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.
Can you fit around our working hours?
We are in the office from 8am until 5pm, Monday to Friday. Tell us your site hours and access windows and the work will be fitted around them.
When is resealing likely to be due?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
Do you take on multi-site work?
Yes. We take on portfolio and planned maintenance work, planned site by site to suit how each building is used.
Common problems we fix in St Mary's
On a busy project, programme pressure can mean fire stopping is rushed or left to whichever trade is closest. That is how unsuitable products and improvised details end up in compartment walls.
Things that normally lead to an enquiry:
- Improvised or mixed-product fire seals
- Unsealed joints where partitions meet the slab
- Old intumescent sealant that has split away
- Snag lists that include open service penetrations
Wherever services are added at a hospital such as Royal South Hants Hospital, 0.5 miles to the north of St Mary's, the compartment line has to be made good with the specified product.
What to look for in a quote
- Which product they’ll use, and why it suits the joint
- Who will actually carry out the work
- How long is the guarantee, and what does it include?
- Do they follow the manufacturer’s priming guidance?
Our process
Where the site stays busy, the work is phased so only one area is out of use at a time. Each area is protected, prepared and sealed, then reopened once the sealant allows before the next one starts. If neighbouring businesses or buildings around St Mary's need work too, visits can be combined. Tell us your site hours and we’ll plan around them.
- First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
- Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
- Unsuitable fillers and loose debris are taken out of each opening.
- 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.
Getting the site ready
- Flag any permit to work we will need
- Warn occupants and staff about the work
- Point out parking and an unloading spot
Request a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price against exactly what is specified. Smaller jobs need nothing more than photographs and a few notes.