Hampshire · England
Fire-rated sealant in Newtown, Hampshire
Fire rated sealant in Newtown from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Ordinary sealant used where a fire-rated product was needed
- Fire seals that have cracked with movement
- Gaps left after a refit or conversion
Fire rated sealant for homes and businesses in Newtown
We often work from an action list drawn up by a fire risk assessor. If you share the list, we can quote for the gaps that need fire-rated sealant. Common call-outs are for new service routes left unsealed after building work and open holes round services passing through fire walls, on flats & HMOs, pipe & cable gaps and plasterboard & masonry.
For a small place like Newtown, the journey and timings are agreed in advance, so it can be fitted around guests, customers or events where possible.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or send us an email.
- Location
- Newtown (PO17)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Also near Newtown
Other services in Newtown
What affects the quote in Newtown
Jobs vary more than people expect. What affects the quote:
- Whether the work is at height
- The type of sealant required
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- What’s wrong with the joints now
- The type of property
- Where the job is, and your postcode
- Any access issues, like height or stairs
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Why deal with it now?
Squirting in whichever sealant is nearest doesn’t make a fire seal. A fire-rated product only performs as tested when it’s installed to its tested detail, which is why we match the product and the method to each gap. In a small place like Newtown, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and give you a clear price before work begins.
Why choose Mr Mastic in Newtown
- Every job guaranteed for a year
- Over 20 years’ experience
- Anti-fungal silicone where joints get wet
- Arbo and Everbuild products
Fire rated sealant around Newtown
Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, which is often where open fire-stopping gaps are first noticed. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
Managing a site like Newtown Soberton Infant School? Then service openings in fire-resisting walls need checking after any refurbishment. For buildings such as Church of the Holy Trinity, older buildings that have had new heating or wiring often have service gaps worth checking. If you let a flat or house near Portchester station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.
Newtown is about 5 miles north-west of Waterlooville, in Hampshire. Every kind of property in Newtown can book us for fire rated sealant, old or new, large or small. Every job comes with our 12-month guarantee. We cover 683 towns and villages across Hampshire. We also work in Portsmouth, about 8 miles from Newtown.
Our applicators cover all of the PO17 postcode area for fire rated sealant. You’ll find streets such as Church Road, Hundred Acres Road and Ingoldfield Lane, all of which we cover. Other places close to Newtown include Southend (1 mile north-east), Soberton Heath (1 mile north), Hoe Gate (1 mile east), Hipley (1 mile south-east) and Woodend (1 mile north-west). We also work in nearby towns such as Winchester (13 miles north-west), Gosport (8 miles south), Havant (7 miles south-east), Eastleigh (10 miles west), Fareham (5 miles south-west) and Horndean (5 miles east).
Local landmarks in Newtown
Around Newtown, our work takes us to homes and buildings near The Bold Forester Public House. Newtown’s nearest station is Portchester station, roughly 4.4 miles south. Nearby you will also find Knowle Hospital (3.8 miles south-west). The countryside around Newtown includes St Clair's Meadow and Portsdown Hill.
When it isn’t the sealant
We will not take on work that will not last, so here’s what sealant cannot put right:
- A wall that isn’t a fire-resisting element to begin with
- Sign-off of the building, which sits with building control or your assessor
- Deciding what fire stopping a building needs
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in Newtown
- Plasterboard & masonry
- Linear gaps
- Service penetrations
- Door frames
- Pipe & cable gaps
- Flats & HMOs
How the job changes by surface
Plasterboard walls
In plasterboard walls, the condition of the board edge matters. Loose material is removed so the sealant has a firm edge.
Door frames
The gap between a door frame and the wall around it needs sealing as well as the door itself. We fill it with a fire-rated product suited to the materials either side.
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Your questions about fire rated sealant in Newtown
Can you help a landlord with a rental near Portchester station?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Can you do fire rated sealant in Newtown?
Yes, Newtown is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Do you do fire sealant around door frames?
Yes, if the gap is within the product’s tested range. We seal the frame-to-wall gap, not the door itself, and we will mention anything we notice about the door.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
Should I try DIY first?
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.
Are you fully insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What we do, step by step
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes from a few hours to a few days, depending on the number of gaps and the access. In a small place like Newtown, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- Backing or fill is fitted where the product’s tested detail calls for it.
- Fire-rated or intumescent sealant is applied to the right depth and tooled.
- Finally, we list where we worked and what we used, for your records.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Ask for a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.