Hampshire · England
Fire Rated Sealant in Northbrook
We cover Northbrook for intumescent and fire-rated sealant around gaps, frames and service penetrations. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Gaps where walls meet ceilings or slabs
- Unsealed gaps around fire door frames
- Gaps around pipes and cables through fire-resisting walls
Your questions about fire rated sealant in Northbrook
Do you cover Northbrook for fire rated sealant?
Yes. Our work covers London and the South East, and Northbrook is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear quote.
I let a flat near Micheldever station. Can you help?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
What’s the difference between intumescent and fire-rated sealant?
Intumescent describes a material that swells in heat. Many fire-rated sealants work this way, but not all, and the choice depends on the gap.
Do you certify the fire stopping?
We do not give ratings or certificates for our work. The requirement comes from your assessor, designer or building control, and we fit a product whose tested details meet it, recording the locations and products.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can I add another job to the visit?
Yes. Just list everything you need.
Can you fill the gap behind a fire door frame?
Yes. We seal the gap between the frame and the wall with a suitable fire-rated product following the tested details. The door leaf and its hardware need a door specialist.
Fire rated sealant in Northbrook, done properly
We often work from an action list drawn up by a fire risk assessor. Send us the list or the survey and we will quote for the fire-rated sealant work on it. Typical jobs include new service routes left unsealed after building work and old fire sealant that has split or come away, on plasterboard & masonry, linear gaps and flats & HMOs.
For holiday lets, converted business premises or a community building near Northbrook, washroom and kitchen sealant and any fire-rated joints need the same attention as anywhere.
You get a 12-month guarantee, the same in Northbrook as everywhere else we work.
- Place
- Northbrook (SO21)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Northbrook
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Do you need fire rated sealant in Northbrook?
Lots of unsealed gaps appear long after the building was completed. New cables, pipes and data runs go through walls and ceilings and the hole round the new service isn’t always sealed again.
It’s worth asking for a quote if you see:
- Fire seals that have cracked with movement
- Open gaps behind door architraves
- Fire stopping disturbed by later work
- Standard silicone or caulk in a fire-stopping gap
Schools such as Micheldever CofE Primary School are buildings too, and service openings in fire-resisting walls need checking after any refurbishment.
Questions to ask before booking
- What insurance they hold
- Whether VAT is included
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
What happens if it’s left?
Fire-rated sealants are less forgiving than ordinary ones. How it’s installed changes how it performs, and we work to the product details every time. In a small place like Northbrook, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Combining jobs into one visit normally makes better use of the time than several visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Northbrook
- 20+ years of sealant experience
- An ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
- Anti-fungal silicone where joints get wet
Read our cost guide or what customers say.
Towns and villages near Northbrook
Other services in Northbrook
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to several days, depending on how many gaps there are. For a village or hamlet like Northbrook, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Access to each area is agreed so the work can run in order.
- We take out any damaged or unsuitable sealant.
- Dust and loose debris are cleaned from each gap.
- We apply and tool the sealant to the product’s tested detail.
- We record what was done and flag anything that needs a different system.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Quotes for fire rated sealant in Northbrook
You will get a clear quote before any work starts. It’s based on:
- How many rooms, windows or areas are involved
- When we can work, for business premises
- How much there is to do
- Access and height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Pictures of the joints, sent by email
- Whether it’s a home or a business
- Any access issues, like height or stairs
- Whether it has been sealed before
If you are in Northbrook and need fire rated sealant, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
Fire rated sealant in Northbrook: local notes
In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, which is often where open fire-stopping gaps are first noticed. We work to the specification you’re given, installing the product to its tested details.
Rented homes near Micheldever station change hands often, and any gap left by new services in shared walls should be closed with a fire-rated product. Community buildings like Church of St Mary are part of the picture too: gaps around pipes and cables are worth checking after any building work there.
Northbrook is about 7 miles north of Winchester, in Hampshire. Whether you are in the middle of Northbrook or further out, fire rated sealant is available for homes and businesses alike. Northbrook is one of 683 towns and villages in Hampshire we cover for fire rated sealant. There’s also a page for Southampton, about 17 miles away.
Work in SO21 works the same way as everywhere else we cover. If you’re just outside Northbrook, we cover Micheldever (1 mile south-east), Stoke Charity (1 mile west), Hunton (2 miles west), Micheldever Station (2 miles north) and East Stratton (2 miles east). Further out, we also cover Basingstoke (11 miles north-east), Winchester (7 miles south), Eastleigh (13 miles south), Andover (10 miles north-west), Chandler's Ford (13 miles south-west) and Alton (13 miles east).
Near you in Northbrook
Locally, jobs take us to homes and businesses close to Half Moon and Spread Eagle pub. The closest station to Northbrook is Micheldever station, roughly 2.1 miles north of the centre.
Different surfaces, different methods
Linear gaps
Long, narrow gaps appear where walls meet slabs and ceilings. They’re sealed with a fire-rated sealant over backing where the detail calls for it.
Service penetrations
New gaps tend to show up where services have been added. We clean out what’s there and reseal to the right depth with backing where the detail needs it.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.