Southampton · England
Southampton Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations for householders, landlords and businesses in Southampton. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps filled with a product that is not fire-rated
- Open joints along the top of partitions
- Unsealed gaps around fire door frames
Fire rated sealant in Southampton
Fire-rated sealant closes the gaps around pipes, cables and frames where they pass through a fire-resisting wall or floor. Each gap is sealed to the product maker’s tested detail for its size and substrate, with a record of the products and locations if you need one. We work on plasterboard & masonry, pipe & cable gaps and service penetrations, and the jobs we see most are ordinary sealant used where a fire-rated product was needed and cracked or shrunken fire-rated sealant.
Places to stay in a town like Southampton need their bathrooms kept in order without closing the building. Room-by-room programmes and out-of-hours working can be arranged.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- Southampton (SO19, SO16, SO15, SO18)
- Region
- Southampton
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
After the cure time, these simple habits help:
- Check whether a sealant can be painted before decorating over it
- Get damaged fire seals looked at promptly
- Tell trades working in the building that fire seals must be put back
- Plan fire stopping into any work that goes through walls or floors
Look at the sealed gaps as part of your routine walk-rounds. Watch for cracking, gaps or seals that have been disturbed and get them seen to.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.
Why act early in Southampton
Fire-rated sealants are less forgiving than ordinary ones. Depth, backing and surface preparation all affect how a seal performs, so we follow the maker’s details on every gap. For landlords in Southampton, failed sealant soon turns into tenant complaints about mould, damp or draughts. Sorting it between tenancies is easier than dealing with it mid-let.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Southampton
- Arbo and Everbuild products
- More than 20 years in sealant work
- Old sealant always removed completely
- Full insurance on every job
Read our cost guide or customer reviews.
Questions from Southampton
Do you work for landlords with property near St Denys station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do you cover Southampton for fire rated sealant?
Yes. We work across London and the South East, and Southampton is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Southampton.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Do you seal gaps around fire door frames?
Yes. We often seal open gaps hidden behind the architrave. Doors, seals and closers need a door specialist.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on how many gaps there are. We will tell you when we quote.
How we quote for fire rated sealant
For a quick quote, just ask. The main things that affect it are:
- The number of rooms or windows
- The size of the job
- The old material and how stubborn it is
- The product the joint needs
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Access, such as stairs, a lift or height
- The rough size of the job
- The problem you’ve noticed
- Any previous sealing or DIY work
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you’re ready, call 0345 464 0079 or email us.
What happens on the day
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work begins. The work normally takes anything from a few hours to several days, depending on how many gaps there are. Jobs in a place the size of Southampton range from town-centre flats to offices and family homes. For each, it helps to know about access, parking and where the joints are.
- We start with the survey or action list, checking the size and surfaces of every gap.
- Old or unsuitable sealant is cut out and the gap cleaned.
- Where the tested detail needs backing or fill, we fit it.
- The sealant goes in to the depth its detail sets, then it’s tooled off.
- Finally, we list where we worked and what we used, for your records.
Preparing for the visit
- Clear items away from the joints we’re working on
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
Get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.
Read more
When something else is needed
New sealant can’t fix everything, and we’ll tell you before work begins. It will not solve:
- Deciding what fire stopping a building needs
- Walls or floors that weren’t built to resist fire
- Openings too large for sealant, which need batts, boards or another system
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
Surfaces we seal
- Service penetrations
- Pipe & cable gaps
- Plasterboard & masonry
- Door frames
- Flats & HMOs
- Linear gaps
Workplaces and buildings in Southampton
For seaside hotels, guest houses and holiday lets around Southampton, heavy use in the busy months is hard on washroom and kitchen sealant, and any building work there should leave fire-rated joints made good. Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We work to the specification you are given, installing the product to its tested details.
If you let a flat or house near St Denys station, new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. Schools such as Bevois Town Primary School are buildings too, and fire-stopping around service openings should be restored whenever new services go in. Community buildings like Saint Mary's are part of the picture too: older buildings that have had new heating or wiring often have service gaps worth checking.
Southampton is in England. We carry out fire rated sealant for householders, landlords and businesses in Southampton and the surrounding area, as part of our work across Southampton. We cover 40 towns and villages across Southampton.
Work in SO19, SO16, SO15 and SO18 works the same way as everywhere else we cover. Fire rated sealant is available to properties on London Road, Marshall Square and Grosvenor Square. Southampton is on the A27 and A33, which makes it straightforward to reach. Neighbouring places we cover for fire rated sealant include Inner Avenue (1 mile west), St Denys (1 mile north-east), Bitterne Manor (1 mile east), Portswood (1 mile north) and Northam (1 mile south-east). Larger places within reach include Maybush (3 miles west), Eling (4 miles west), Rownhams (3 miles north-west), Hounsdown (5 miles west), Nursling (4 miles north-west) and Hillyfields (3 miles west).
Local landmarks in Southampton
Locally, jobs take us to homes and businesses close to Rockstone Place Park, The Hobbit pub and St Mary's Independent School and the streets around them. Southampton has its own railway station: St Denys station. A little further out are Marlands Shopping Centre (1 mile south-west) and R J Mitchell Museum (0.9 miles south-west). Green spaces nearby include Netley Common.
How the job changes by surface
Plasterboard walls
Service holes in plasterboard are often rough and oversized. Where a hole is bigger than the sealant’s tested range, it needs another approach.
Masonry and concrete
Masonry is dusty and porous, so preparation matters. We brush and vacuum the gap and use backing where the detail needs it before the sealant goes in.
Also near Southampton
Other services in Southampton
Landlords, agents and businesses in Southampton
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
If you manage several properties in or around Southampton, several properties can go on one quote. Send us the addresses and the work at each.